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Automatic valve refers to the valve that does not need an external force to drive, but depends on the energy of the medium itself to make the valve action. Such as PVC Safety Valve, PVC Pressure Reduce Valve, drain valve, Plastic Check Valve, automatic regulating valve, etc. Use: Can be used to control the flow of water, steam, oil, gas, mud, various corrosive media, liquid metals and radioactive fluids. Components: Composition of valve body, valve core and control device. Function: Measure and control of pipeline fluid and prevent valve closing flow may cause safety and other accidents. Application: The automatic valve in the compressor is a spring-connected valve sheet, whose opening and closing depends on the pressure difference between the inside and outside of the valve sheet (atmospheric pressure and cylinder pressure). Installation method: Before the automatic valve is loaded into the automatic valve box, it should be disassembled and cleaned with clean alcohol. If the automatic valve is used, you must grind the sealing surface, and then test the pressure with special tools. Under the pressure of 6 kg / cm 2, the leakage amount is less than 0.1 l / min. In the actual work can fill kerosene leakage detection or use soap water inspection institute first put the automatic valve in the special tools, into 6 kg / cm 2 pressure, what pressure 3 points of air leakage of the standard family taboo within 3 minutes of the diameter of 40 mm soap should not be more than 6. Automatic valves that pass the pressure test should be open pin for backup. Pay special attention to the opening pin must be used low temperature resistant brass or stainless steel products, can not casually use the general opening pin substitute. When the air separator is installed, and the impurities in the accumulator (or reversible heat exchanger) and the inner pipe in the tower are completely blown away to prepare the sulfur of the bottom fractionate to heat the automatic valve into the automatic valve box. The automatic valve box should be cleaned and drained with alcohol. Installation method; install the upper layer first and then the lower layer first. When installing, pay attention to the Rubber Gasket to put straight, especially the pure aluminum pad to be neat. Tighten the pressing nut symmetrically and evenly.

The working performance of the check valve has a direct impact on the performance of the whole system. The Plastic Check Valve is affected by the transient change of the pressure field in the H76 check valve, calculate the corresponding performance curve and optimize the structure by reference. To reduce the energy loss of the medium passing through the valve, Optimize the structure of the current diversion structure; Analyze the factors affecting pressure drop, pulse and valve valve vibration during the passage of the medium, Get the best valve opening Angle; Select the torsion springs according to the boundary conditions and working conditions, Reduce the pressure drop and stop the pump water hammer; Analyze the influence of check valve diameter on water hammer, Select the check valve with the appropriate nominal diameter to reduce the damage to the pipe system; Check valve hydrostatic analysis check, Ensure the strength of the check valve statically; Dynamic characteristic mode analysis, Master the dynamic vibration characteristics of the Ball Check Valve, Find the weak link of the valve body vibration; Using buffer cylinder to reduce the check valve, Limit the pipe pressure increase to a safe range, Reduce the positive pressure water hammer, Limit the backflow flow and inversion speed, Reducing the water hammer plays an important role. Working characteristics: The working characteristics of the check valve are large load change, small opening and closing frequency, a input closing or open state, the application cycle is very long, and does not require the movement of the moving parts. But once there is a "switch" requirement, it must be flexible, which is more demanding than the common mechanical movement. Because the check valve in most practical use, qualitatively determined for rapid closure, and at the moment of the check valve is closed, the medium is the direction of the flow, with the closure of the valve disc, the medium from the maximum back flow speed quickly fell to zero, and the pressure rises rapidly, that is, the "water hammer" phenomenon may damage the pipe system. For the high pressure pipe system of multiple pumps, the water hammer problem of the PVC Ball Check Valve is more prominent. Water hammer is a pressure wave in the transient flow in a pressure pipe. It is the phenomenon of the pressure jump or drop due to the change of the fluid flow velocity in the pressure pipe. The physical reason is the incompressibility, the inertia and the elasticity of the pipeline. Use: The Wafer Check Valve is used in the pipeline system, its main function is to prevent the medium back flow, prevent the pump and its drive motor reversal, and the discharge of the medium in the vessel. The PVC Check Valve can also be used to supply lines in which the pressure may rise to the auxiliary system exceeding the pressure of the main system. Check valve according to the different material, can be applied to a variety of media pipeline. The PVC Swing Check Valve is installed on the pipe, which becomes one of the fluid components and the valve is affected by the transient flow state of the system; in turn, the closing characteristics of the valve valve act on the fluid flow state.

Brief introduction:The check valve is also known as counter current valve, PVC Safety Valve, PVC Back Pressure Valve, PVC Check Valve. This kind of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which belongs to a kind of automatic valve. Check valve is to point to the valve relying on the flow of medium itself and automatically open, close valve valve, used to prevent medium back flow, also known as check valve, one-way valve, counter-current valve, and back pressure valve. Plastic Check Valve is an automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor reversal, and the discharge of the vessel medium. Check valves can also be used to supply lines in which pressure may rise to exceed the auxiliary system pressure. Ball Check Valve can be mainly divided into rotary start type check valve (rotating according to the center of gravity) and lifting type check valve (moving along the axis). Operational principle:This type of valve functions to allow the medium to flow in one direction and prevent flow in the opposite direction. Usually the valve works automatically and opens the valve disc under a directional flowing fluid pressure; During the fluid flow in the opposite direction, the fluid pressure and the valve disc stop on the valve seat to cut off the flow. The stainless steel pair of clip type check valve belongs to this type of valve, it includes rotary start type check valve and lift type check valve. The Swing Check Valve has a single hinge mechanism, and a door-like flap that is free of leaning against the surface of the tilted valve seat. To ensure that the flap reaches the proper position on the seat face each time, the flap is designed at the hinge mechanism so that the flap has sufficient room for rotation and makes true and full contact with the seat. The flap can be either made all out of metal, or inlaid with leather, rubber, or with a synthetic covering, depending on the performance requirements. When the PVC Swing Check Valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop passing through the valve is relatively small. The valve seat of the lift check is located on the seat sealing face on the body. This valve is the rest of the valve, like the stop valve, the fluid pressure raises the valve flap from the valve seat sealing surface, the medium reflux causes the valve flap to fall back to the valve seat, and cut off the flow. Depending on the conditions of use, the flap can be an all-metal structure or in the form of a rubber pad or rubber ring inlaid on the valve holder. Like the stop valve, the fluid flow through the lift check valve is narrow, so the pressure drop through the lift check valve is larger than the lift check valve, and the flow of the lift check valve is rarely limited.

Maintenance: 1. Inside and outside the valve body (including the variable speed transmission box), the first thing should be shot to clear the sand and rust, and strive to electrostatic spraying powder non-toxic epoxy resin, the thickness of more than 0.3mm. When it is difficult to electrospray non-toxic epoxy resin for extremely large valves, it should also be painted and sprayed with similar non-toxic epoxy paint. 2. The valve body and each part of the valve plate require comprehensive anticorrosion, on the one hand, soaking in water will not rust, no electrochemical corrosion between the two metals; on the other side, the smooth surface reduces the water resistance. 3. The sanitary requirements of epoxy resin or paint in the valve shall be reported by the corresponding authorities. The chemical and physical properties shall also meet the relevant requirements. Packaging transportation: 1. Light blocking plate should be fixed on both sides of the valve. 2. Medium and small diameter valves should be tied with straw rope and transported by container. 3. Large-diameter valves also have simple wooden strip frame solid packaging, so as to avoid damage during transportation. General requirements: 1. The specifications and categories of Pneumatic Diaphragm Valve shall meet the requirements of the pipeline design documents. 2. The model of the pneumatic Control Valve should indicate the number requirements of the basic national standard. In case of the enterprise standard, the relevant description of the model should be indicated. 3. The working pressure of the pneumatic valve requires that the working pressure of the valve shall withstand 1.1 times the valve working pressure without leakage. 4. Pneumatic Control Valves manufacturing standards should explain the basic national standard number. If the enterprise standard is the enterprise standard, the enterprise documents should be attached to the procurement contract. Pneumatic Valve standard is divided into three specifications: national standard, American standard and Japanese standard. 5. The complete description of the pneumatic valve includes its specifications, materials, connection mode, and action mode (where the action mode is divided into 1: double action, 2: single action). Performance requirement: 1. During batch manufacturing of a valve, the authority shall be entrusted to test the following properties: ①Opening and closing moment of the Pneumatic Ball Valve under the working pressure condition; ②Under the working pressure condition, can ensure that the valve is closed tightly continuous opening and closing times; ③Detection of the flow resistance coefficient of the valve under the pipeline water transmission condition. 2. The valve shall be tested before leaving the factory: ①When the valve is open, the valve body should bear twice the working pressure value of the valve internal pressure detection; ②Under the condition that the valve is closed, both sides shall bear 1.1 times the valve working pressure value without leakage; but the leakage value of the metal-sealed butterfly valve Pneumatic Butterfly Valve is not greater than the relevant requirements.

Electric control valve is a hydraulic operated valve with solenoid valve as the guide valve. Often used in the automatic control of water supply and drainage and industrial system, the control response is accurate and fast, according to the electrical signal remote control to open and close the pipe road system, to achieve remote operation. Replacing Gate Valve and Butterfly Valve for large electric operating systems. The valve closing speed is adjustable, and it is closed smoothly without causing pressure fluctuations. The valve is small in size, light in weight, easy in maintenance, easy to use, safe and reliable. Plastic solenoid Valve can choose AC power 220V, or DC power 24V, can be selected according to various occasions often open or often closed type can be. Electric three-way ball valve: the two-valve seat sealed three-way ball valve has a compact structure, beautiful appearance, good sealing performance. It can switch over the flow direction of the medium in the pipeline. It can also connect or close two channels vertical to each other. Four-valve seat sealed three-way ball valve has beautiful shape, compact and reasonable structure. Product composition: the Electric Ball Valve is composed of the intelligent actuator and the three-way ball valve. Product advantages: the Electric Control Ball Valve is a rotary cut-off adjustment valve, with the advantages of tight closure, compact structure, light weight, easy maintenance and other advantages. Application field: the Electric Valve three-way ball valve is widely used in the pipeline automatic control of gas, liquid, steam, oil products and other corrosive media. Product characteristics: 1. the two-valve seat sealed three-way ball valve has a compact structure, beautiful appearance, good sealing performance. It can switch over the flow direction of the medium in the pipeline. 2.It can also connect or close two channels vertical to each other. Four-valve seat sealed three-way ball valve has beautiful shape, compact and reasonable structure. 3.It can not only realize the flow of medium switching, but also can make the three channels connected to each other, now can either channel closed, so that the other two channels connected, flexibly control the confluence or diversion of medium in the pipeline.

Safety valve is a more special branch of the valve family, its particularity is different from other valves only play the role of switch, more important is to protect the safety of equipment. With the rapid development of China's economic construction, there are more and more equipment projects with pressure control. In view of the equipment pressure relief needs, the PVDF Safety Valve plays a vital role in protecting the equipment process. Safety valves are important safety accessories for boilers, pressure vessels, and other stressed equipment. The Safety valve, also known as the pressure relief valve, is automatically opened and closed according to the working pressure (working temperature) of the pressure system, and is generally installed in the closed system of equipment or pipeline protection system safety. When the pressure or temperature in the equipment or pipe exceeds the set pressure of the PVC Back Pressure Valve, open the pressure relief or cooling automatically, to ensure that the medium pressure (temperature) in the equipment and pipe is under the set pressure (temperature), protect the normal operation of the equipment and pipe, prevent accidents and reduce losses. PVC Safety Valve is mainly widely used in: steam boiler, LPG automobile tank truck or LPG railway tank truck, oil production well, steam power generation equipment of high pressure bypass, pressure pipeline, pressure vessel, etc. Safety valves are generally divided into spring type safety valve, lever type safety valve and pulse type safety valve, among which spring type safety valve is the most common application; including threaded safety valve and flange safety valve. CPVC Safety Valve diameter is generally not large, commonly used between DN15mm-DN80mm, more than 150mm is generally called a large diameter safety valve. Common safety valves generally have the following types: 1. According to the overall structure and loading structure, it can be divided into heavy hammer lever safety valve, spring safety valve and control type. 2. According to the ratio of valve flap opening height and valve circulation diameter, it can be divided into micro-start type and full-start safety valve. 3. According to the gas emission mode of the safety valve, it can be divided into fully closed, semi-closed and open three types. The selection of a suitable PVC Pressure Reduce Valve should be considered from the following aspects: 1. Structure and form mainly depends on the process conditions, working media and characteristics of the equipment. General boiler, pressure vessel discharge volume is not large to choose spring safety valve, otherwise the choice of fully open safety valve is better. 2. If the medium is toxic, flammable and explosive, a closed safety valve should be selected. 3. Each safety valve has its own working pressure range, and it should be selected according to the actual requirements. 4. The discharge volume of the selected safety valve must be greater than the discharge volume of the equipment, so as to ensure that part of the medium is excluded and avoid the pressure continues to rise. Installation Notes: 1. All kinds of safety valves should be installed vertically. 2. There should be no resistance at the outlet of the PP back pressure valve to avoid the compression phenomenon. 3. The safety valve should be specially tested and sealed before installation. 4. The safety valve in use should be checked regularly.

The safety valve is a special valve in which the opening and closing part is normally closed under the action of external forces. When the medium pressure in the equipment or the pipe exceeds the specified value, the medium pressure in the pipe or the equipment exceeds the specified value by discharging the medium into the system. The PVC Back Pressure Valve belongs to the automatic valve category, which is mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, and it plays an important role in protecting personal safety and equipment operation. The PVC Safety Valve must be pressure tested to use. Main functions:The PVDF Safety Valve plays a safety protection in the system. When the system pressure exceeds the specified value, the PVC Pressure Reduce Valve opens and discharges part of the gas / fluid in the system into the atmosphere / pipe, so that the system pressure does not exceed the allowable value, so that the system does not cause accidents due to high pressure. Operation method: Opening pressure adjustment: 1. Before the safety valve is factory, the opening pressure should be adjusted to the setting value required by the user. If the user proposes the spring working pressure level, the factory should be adjusted according to the lower limit of the pressure level. 2. Before installing the CPVC Safety Valve on the protected equipment, the user must readjust it at the installation site to ensure that the set pressure value of the safety valve meets the requirements. 3. Adjust the opening pressure by rotating the adjustment screw to change the spring pressure amount within the spring working pressure level indicated on the nameplate. 4. Before rotating the adjustment screw, the valve inlet pressure should be reduced to below 90% of the opening pressure to prevent the valve flap from being driven by rotating during the rotation adjustment screw and causing the damage to the sealing surface. 5. In order to ensure the accuracy of the opening pressure value, the medium conditions during the adjustment, such as the medium type and temperature, should be as close to the actual operating conditions as possible. The medium type changes, especially when the medium poly-product state is different (for example, from liquid phase to gas phase), the opening pressure often changes. When the operating temperature increases, the opening pressure generally decreases. Therefore, when adjusted at normal temperature and used for high temperature, the setting pressure value at normal temperature should be slightly higher than the required opening pressure value. High to what extent and the valve structure and material selection are related, should be based on the instructions of the manufacturer.

Plastic Ball Valve structure is simple, only composed of a few parts, material consumption saving; small volume, light weight, small installation size, small drive torque, small operation, easy and fast, only rotate 90 can quickly open and close; and also has good flow regulation function and close sealing characteristics, in the use of large and medium caliber, medium and low pressure field, plastic Flange Ball Valve is the dominant valve form. When the ball valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop generated through the valve is very small, so it has good flow control characteristics. Ball valve has elastic seal and metal seal two sealing types. Elastic seal valve, seal ring can be embedded on the valve body or attached to the butterfly plate periphery. Valves with metal seals generally last longer than elastic valves, but it is difficult to seal completely. Metal seals can adapt to high working temperatures, while elastic seals are temperature-limited defective. If ball valves are required to be used as a flow control, the main thing is to correctly select the size and valve type. The structure principle of the PVC ball valve is especially suitable for making large diameter valves. Ball valve is not only widely used in oil, gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power station. Plastic ball valves can transport mud and store the least liquid at the pipe mouth. At low pressure, good sealing can be achieved. Good adjustment performance. The streamline design of the plastic flange ball valve makes the fluid resistance loss small, and it can be said that it is an energy-saving product. The valve stem is an open rod structure, after quality adjustment treatment, has good comprehensive mechanical properties and corrosion resistance, abrasion resistance. When the ball valve is opened and closed, the valve rod is only rotated without lifting and running. The filler of the valve rod is not easy to destroy, and the seal is reliable. Fixed with the butterfly plate cone pin, and the external extension end is designed to prevent the accidental collapse of the valve stem at the connection between the valve stem and the butterfly plate. The connection modes include flange connection, butt clip connection, butt weld connection and lug butt clip connection. The drive form has manual, worm wheel transmission, Electric Ball Valve, Pneumatic Ball Valve, liquid dynamic, electric-liquid linkage and other actuators, which can realize long-distance control and automatic operation. The main characteristics of plastic ball valve itself is compact structure, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface are often in a closed state, not easy to be eroded by medium, easy operation and maintenance, suitable for water, solvent, acid and natural gas and other general working medium, but also suitable for poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, is widely used in various industries. Ball valve body can be integral or combined.

Operational principle:The relationship between the opening and flow of plastic ball valve basically changes in linear proportion. If used to control the flow, its flow characteristics and the pipe is also closely related to the flow resistance of the pipe, the valve diameter and form of the two pipelines are all the same, and the pipeline loss coefficient is different, the valve flow will be very different. If the valve is in a large state of throttle range, the back of the valve plate is prone to air erosion, there is a possibility of damage to the valve, are generally used outside 15. Plastic ball valve in the medium opening, the valve body and the butterfly front opening shape of the valve shaft as the center, on both sides to complete different state, one side of the butterfly front along the direction of the upstream water, therefore, one side of the valve body and valve form like nozzle opening, on the other side of the throttle hole opening, nozzle side is faster than throttle side flow rate, and throttle side valve will produce negative pressure, often appear rubber seal fall off. PVC Ball Valve and the butterfly lever themselves have no self-locking ability, in order to locate the butterfly plate, the worm gear reducer should be installed on the valve lever. The worm gear reducer can not only make the butterfly plate have self-locking ability and stop at any position, but also improve the operation performance of the valve. Plastic Union Ball Valve operating torque, due to the opening degree and valve opening direction of the different values, horizontal ball valve, especially the large diameter valve, due to the water depth, the valve shaft, water head difference produced by the torque can not be ignored. In addition, the valve inlet side of the device elbow, the formation of deflection, the torque will increase. When the valve is in the middle opening, the operating mechanism needs to self-lock due to the water flow moment. Plastic ball valve structure is simple, only composed of a few parts, material consumption saving; small volume, light weight, small installation size, small drive torque, small operation, easy and fast, only rotate 90 can quickly open and close; and also has good flow regulation function and close sealing characteristics, in the use of large and medium caliber, medium and low pressure field, plastic ball valve is the dominant valve form. When the Flange Ball Valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop generated through the valve is very small, so it has good flow control characteristics. Ball valve has elastic seal and metal seal two sealing types. Elastic seal valve, seal ring can be embedded on the valve body or attached to the butterfly plate periphery. Valves with metal seals generally last longer than elastic valves, but it is difficult to seal completely. Metal seals can adapt to high working temperatures, while elastic seals are temperature-limited defective. If ball valves are required to be used as a flow control, the main thing is to correctly select the size and valve type. The structure principle of the UPVC Ball Valve is especially suitable for making large diameter valves. Ball valve is not only widely used in oil, gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power station.

Plastic ball valve is suitable for the interception of the transmission process with corrosive medium, according to the different material temperature-14℃ ~100℃, -40℃ ~140℃. All the parts are assembled by RPP or PVDF injection molding parts, and the plastic ball valve has good corrosion resistance. The sealing ring is made of F4. Excellent rot resistance, extended service life. Flexible rotation, easy to use. Plastic ball valve integral ball valve leakage point is less, high strength, connecting the ball valve installation and disassembly is convenient. Plastic ball valve classification: flange plastic ball valve, wire buckle plastic ball valve, bearing plastic ball valve, double make plastic ball valve. Plastic ball valve consists of an integrated electric actuator. Input 220V power supply can directly adjust the switching amount, but also can be built-in servo module, input control signal (4~20mADC or 1~5VDC) and single-phase power supply can control the operation. PVC Ball Valve is light in weight, has strong corrosion resistance, and is used in many fields, such as the general pure water and raw drinking water pipeline system, drainage and sewage pipeline system, saline and seawater pipeline system, acid-base and chemical solution system and other industries, the quality has been recognized by the majority of users. Plastic ball valve is mainly used to cut off or connect the medium in the pipeline, and can also be used for fluid adjustment and control, compared with other valves, it has the following advantages.1. Small fluid resistance, the ball valve is the smallest fluid resistance of all valves, even the shrinkage ball valve, its fluid resistance is quite small. UPVC ball valve is a new material ball valve product developed according to various corrosive pipeline fluids. Product advantages: the valve body is light in weight, strong in corrosion resistance, compact and beautiful in external structure, light in body weight and easy to install, strong in corrosion resistance, a wide range of applications, material health and non-toxic, wear resistance, easy to remove, easy to maintain. Plastic ball valve in addition to the UPVC plastic material, and RPP, PVDF Ball Valve, PPH Ball Valve, CPVC Ball Valve and so on. Structural features: the plastic ball valve has the characteristics of simple structure, small volume, light weight, less material consumption, small installation size, fast switch, 90 reciprocating rotation, small drive moment and so on, used to cut off, connect, adjust the medium in the pipeline, has good fluid control characteristics and close the sealing performance. With the application of preservative synthetic rubber and PTFE, the performance of the ball valve is improved and satisfied to different working conditions. In recent ten years, metal sealing ball valve has developed rapidly, with the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong corrosion resistance, high strength alloy materials in plastic butterfly valve, make metal sealing ball valve in high temperature, low temperature, strong erosion and other working conditions have been widely used, and partially replaced the plastic stop valve, plastic gate valve and ball valve.

Check valve is an automatic valve used to open when the pipeline system medium is downstream and close when the counter current. The main function is to prevent the back flow of the medium, pump and drive mechanical reversal, prevent the water strike wave generated when the pump and drive motor suddenly stop running, and reduce the damage to the pipeline system. According to the relative displacement mode of the closed parts and the valve seat, the PVC Ball Check Valve can be divided into five categories:Swing Check Valve,Wafer Check Valve,Ball Check Valve, lifting type, turning type, disc type, diaphragm type and spherical check valve. For the above check valves, most have the following disadvantages: "loud noise" and vibration caused by the water hammer; the vibration between the "joint parts" in the valve shaft and the shaft, the mechanical friction between the shaft and the valve plate vibration frequency, valve plate displacement, seal failure, sometimes cause the valve plate off, system protection failure; valve fluid flow disorder, large flow resistance loss, serious energy loss. In order to avoid and improve the above shortcomings, the spherical PVC Check Valve, with its good sealing and small flow resistance and other performance advantages, has been widely used and promoted. Its structure is gradually improved from the initial "single ball" check valve to the "independent multi-channel multi-ball" Plastic Check Valve. Check valve is one of the most commonly used equipment types for fluid transmission. The existing check valve has the problems of large resistance and large energy consumption. Reducing the flow resistance coefficient is an important way to save energy in fluid transmission. Common check valves include spherical check valve, pair clip check valve, etc. The common disadvantage of these check valves is that: when the fluid flow is moving forward, the check valve opens, some parts of the Ball Check Valve, such as the valve flap or the sphere, is in the center of the flow channel, there is a certain water retaining area, the resistance to the fluid flow is large, so that the effluent pressure is reduced, so the waste of energy. Structure: the spherical check valve is a kind of multi-ball, multi-flow channel, multi-cone inverted fluid structure of the check valve, mainly composed of the front and rear valve body, rubber ball, cone body, etc. Working principle: the rubber ball in the ball cover for a short stroke rolling to achieve the opening and closing of the valve. When the pump is started, the water drives off the rubber ball under the pressure to roll the glue ball to the right side by the cone in the rear valve body to open the check valve. After the pump stops, force the rubber ball due to the backwater pressure in the pipeline system to close the check valve. The rubber ball adopts hollow steel ball. The external elastic rubber can ensure both sealing and reduce the damage to the pipe system in the process of valve closing. When the valve opens, the cone with holes in the body plays a fixed role on the steel ball and eliminates the pressure of the contact area between the rubber ball and the cone, making the contact a surface contact, and reducing the hydraulic loss caused by the trembling of the rubber ball in the valve body.

Static Mixer is an advanced kind of mixer developed in the early 1970s. In 1970, the United States Kai Dennis Company first launched the static mixer developed by it. After the 2980s, the domestic related enterprises have also put into research and production, which has also been well used in the production of emulsification fuel. Since the 1970s, the static mixer has been used in the chemical industry, food industry, textile and light industry and other industries, and has achieved good results. At the same time, the viscosity of curing agent and epoxy resin is very different (epoxy resin viscosity is 20~80 times that of curing agent), and the two fluids in the pipeline is very low, making it difficult to mix evenly. PVC Static Mixer is an advanced unit equipment, and unlike the mixer, it has no moving parts inside, mainly using fluid flow and internal units to achieve the mixing of various fluids and structural special design rationality. The PVDF Static Mixer, compared with hole plate column, Wen tube, agitator, homogenizer and other equipment, has high efficiency, low energy consumption, small volume, less investment and easy continuous production. In the static mixer, the motion of the fluid follows the law of "division-shift-overlap", and the main role in the mixing process is the displacement. The displacement mode can be divided into two categories: "the relative shift caused by the same section flow rate distribution and the" the multi-channel relative shift ", and different types of mixers also have different displacement modes. Static mixers are applied not only to mixing processes, but also to processes related to mixing-transfer, including gas / gas mixing, liquid / liquid extraction, gas / liquid reaction, enhanced heat transfer, and liquid / liquid reaction, and other processes. Plastic Static Mixer is widely used in plastics, chemical industry, medicine, mining and metallurgy, food, daily chemical, pesticide, cable, oil, paper making, chemical fiber, biology, environmental protection and other industries. Because the product has low energy consumption, investment saving, good effect, quick effect, it has brought considerable economic benefits for users. The mixing process of a static mixer is performed by a series of mixing units of different specifications installed in hollow pipes. Due to the action of the mixing unit, the fluid is sometimes rotated left and sometimes right, constantly changing the direction of the flow mixer, not only pushing the central fluid to the periphery, but also pushing the surrounding fluid to the center, thus causing a good radial mixing effect. At the same time, the rotation action of the fluid itself also occurs at the interface of adjacent components. This perfect radial circulation mixing action enables the purpose of uniform mixing. A CPVC Static Mixer is an efficient mixing device without movement, allowing for cutting, cutting, rotation and remixing of the two or more fluids, and thus achieving the purpose of good dispersion and full mixing between the fluids.

Y filter, also known as decontamination, filter valve, is an indispensable device of conveying medium pipeline system, its role is the mechanical impurities in the filter medium, can on the sewage rust, sand, a small amount of solid particles in the liquid filter to protect the equipment pipe accessories from wear and blockage, can protect the normal work of equipment. Principle: 1. Bubble point method test principle: when the filter membrane and filter element with a certain solution completely infiltration, and then through the gas source on the side (our instrument has intake control system, can stabilize pressure), adjust the intake), with the increase of pressure, the gas from the side of the filter membrane, show the membrane side of the size, number of bubbles, through the instrument to determine the corresponding pressure value is the bubble point. 2. Diffusion flow method test principle: diffusion flow test refers to when the gas pressure is 80% of the blebbing point value of the filter element, then there is not a large number of gas perforation, only a small amount of gas first dissolved into the diaphragm of the liquid phase, and then diffuse from the liquid phase to the gas phase on the other side, this part of the gas is called diffusion flow. 3. Why does the method of diffusion flow be better: the foaming point value is only a qualitative value, from the beginning to the last group foaming is a relatively long process, which cannot be accurately quantified. The measurement of diffusion flow value is a quantitative value, not only can accurately determine the integrity of the Y Strainer, but also can reflect the porosity, flow rate and effective filtration area of the membrane. 4. Test principle of the water intrusion method: The water intrusion method is dedicated to the test of the hydrophobic filter element, the hydrophobic membrane is resistant to water, the smaller the aperture, the greater the pressure needed to squeeze the water into the hydrophobic film. So under a certain pressure, the water flow squeezed into the filter film is measured to determine the aperture of the filter element. Installation attention: 1. Steam or gas pipe: filter toward the horizontal direction; 2. Liquid pipe: filter toward toward the downward installation; 3. Vertical installation: according to the filter installation pointing. Product application: Y Plastic Strainer, as an indispensable efficient filtration equipment in purification equipment engineering, has played a great role in the treatment of domestic wastewater and industrial sewage. With its advantages in design and application, it has now been favored. Y-type filter in the application of various industries has effectively treated a large number of domestic and industrial sewage, so that the valuable water resources have been effectively reused, saving a lot of water resources. The advantages of Y PVC Strainer operation include full automation, maintenance-free, large filter area, high filter efficiency, long service life, stainless steel material, optional filter accuracy, and complete specifications. Compared with other filtration equipment, it is one of the most effective equipment in reclaimed water reuse engineering. And the water quality after the Plastic Filter treatment not only meets the national discharge standards, but also realizes the purpose of reuse and recycling.

The main measuring element of the glass rotor flow meter is a vertically mounted small upper large cone glass tube and a float movable up and down inside. When the fluid flows bottom-up through the conical glass tube, the pressure difference occurs between the float up and down the float, and the float rises under the differential pressure. When the rising force force, the buoyancy force, and the viscosity lift force are equal to the gravity force of the float, the float is in an equilibrium position. Therefore, there is a certain proportional relationship between the fluid flow through the glass rotor meter and the float rising height, that is, and the circulation area of the glass ROTA METER, and the position height of the float can be regarded as the flow measure. Application scope: the wide application of glass rotor flow meter, flow measurement technology and instrument application roughly has the following fields. 1.Industrial production process: Flow meter is one of the big instrument of process automation instrument and device, it is widely used in metallurgy, electricity, coal, chemical, oil, transportation, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life and other areas of the national economy, is the development of industrial and agricultural production, the energy saving, improve product quality, improve the economic benefit and management level of important tools occupies an important position in the national economy. In the process automation instrument and the device, the flow meter has two major functions: as the detection instrument of the process automation control system and the total amount of the material quantity measurement table. 2.Energy measurement: energy is divided into primary energy (coal, crude oil, coal-bed methane, petroleum gas and natural gas), secondary energy (electricity, coke, artificial gas, refined oil, liquefied petroleum gas, steam) and energy-carrying working matter (compressed air, oxygen, nitrogen, hydrogen, water), etc. Energy measurement is an important means to scientifically manage energy, save energy and reduce consumption, and improve economic benefits. Flow meters are an important part of energy metering meters. Water, artificial gas, natural gas, steam, oil products and other commonly used energy sources all use an extremely large amount of flow meters, which are indispensable tools for energy management and economic accounting. 3.Environmental protection projects: the discharge of flue gas, waste liquid and sewage seriously pollutes the atmosphere and water resources, seriously threatening the human living environment. The country has listed sustainable development as a national policy, and environmental protection will be the biggest issue in the 21st century. For the air and water pollution to be controlled, the management must be strengthened, and the basis of the management is the quantitative control of the pollution quantity. 4.Transportation: there are five ways: railway and road, aviation, water transport, and pipeline transportation. Although the pipeline transportation has long been there, but the application is not common. With the prominent environmental protection problems, the characteristics of pipeline transportation cause people's attention. Pipeline transportation must be equipped with a PANEL FLOW METER, and it is the eye of control, distribution and dispatch, and it is also a necessary tool for safety supervision and economic accounting. 5.Biotechnology: The 21st century will usher in the century of life science, and the industry characterized by biotechnology will develop rapidly. There are many substances that need to be monitored and measured in biotechnology, such as blood, urine, etc. The development of instrument is extremely difficult, a variety of. 6.Scientific experiment: the GAS FLOW METER that scientific experiment needs is not only large in quantity, and the variety is extremely complex. According to the statistical flow meter of more than 100 kinds of a large part of the needs of scientific research, they are not mass-produced, sold in the market, many scientific research institutions and large enterprises are set up special teams to develop a special FLOW METER. 7.Marine weather, rivers and lakes: These areas are open flow channels, generally need to detect the flow rate, and then calculate the flow rate. The physical principle and flow mechanics basis of the flow meter and the flow meter are in common, but the principle, structure and use condition of the instrument are very different.

Installation and use: how to correctly choose the glass rotor flow meter: the glass rotor FLOW METER is a simple use, convenient reading, a very wide use of the instantaneous flow measurement instrument. In the category of environmental protection equipment and instruments, more than 30,000 sets per year are used. Therefore, it is very important to choose and use this instrument well. Glass ROTA METER varieties and selection of glass rotor flow meter: glass rotor flow meter according to its use and adaptation scope can be divided into: ordinary, reinforced vascular type, small flow and small shape, rot resistant, laboratory, thermal insulation, alarm and high pressure resistant eight series. According to the national instrument series type spectrum, no matter which series, includes up to from 1 mm to 100 mm a total of 12 caliber number, the measurable flow range is: liquid (water) 0.1 ml / minute ~40 cubic meters / hour, gas (air) 1 ml / minute ~1000 cubic meters / hour. The glass rotor flow meter used for environmental protection instruments generally does not exceed 10 mm in diameter, and the measured flow rate is in a small flow range. Scale correction of glass rotor flow meter: The scale of glass PANEL FLOW METER is obtained by the use of nearly ideal fluid water and dry air as medium calibration by the manufacturer under the factory conditions. But in the use of the flow meter site, there are two situations can not directly use its scale value: one is the measurement medium is not water and air, the other is to measure and although the medium is water and air, but its state (temperature. Pressure) is different from the scale state. In this way, when using the flow meter, you need to correct the correct measurement. Therefore, solving the glass rotor flow meter scale correction, is the key to well use this instrument. Considering the large amount of the rotor flow meter, only the density correction of the gas medium measurement is discussed below. Because the viscosity of the gas medium is very small, the viscosity influence is omitted from the discussion. Practice has proved that this does not affect the corrected accuracy. Main features: small pressure loss; reliable performance; simple structure, easy installation and use; cheap price. The main measuring element of the glass GAS FLOW METER is a vertically mounted conical glass tube and a float, movable up and down inside. The cone tube goes up at the end, and when the fluid passes from the bottom up through the cone glass tube, the pressure difference occurs between the float, and the float rises under the differential pressure. When the rising force of the float is equal to the resultant force of the gravity, the float and the viscosity force of the float, the float is in the equilibrium position. Therefore, there is a certain proportional relationship between the fluid flow through the glass rotor meter and the rising height of the float, that is, and the flow meter area of the glass rotor meter, and the position height of the float can be regarded as the flow measure. Corruption-resistant series glass rotor is mainly composed of conical glass tube, float, upper and lower base and support parts connection and combination. According to the use and adaptation scope of the glass rotor flow meter can be divided into: ordinary type, band band vascular type, small flow rate and small shape type, rot resistance type, laboratory type, thermal insulation type, alarm type and high pressure resistance type eight series.

The main measuring element of the glass rotor flow meter is a vertically mounted small upper large cone glass tube and a float movable up and down inside. When the fluid flows bottom-up through the conical glass tube, the pressure difference occurs between the float up and down the float, and the float rises under the differential pressure. When the rising force force, the buoyancy force, and the viscosity lift force are equal to the gravity force of the float, the float is in an equilibrium position. Therefore, there is a certain proportional relationship between the fluid flow through the glass rotor meter and the float rising height, that is, and the circulation area of the glass rotor FLOW METER, and the position height of the float can be regarded as the flow measure. Use: Glass PANEL FLOW METER is mainly used in chemical industry, petroleum, light industry, medicine, chemical fertilizer, chemical fiber, food, dye, environmental protection and scientific research departments, used to measure the flow of single-phase non-pulsating (liquid or gas) fluid. Corrosion-resistant glass GAS FLOW METER is mainly used for the detection of corrosive liquid and gas media flow, such as strong acid (except hydrofluoric acid), strong alkali, oxidant, strong oxidation acid, organic solvents and other corrosive gas or liquid media flow detection. Structural principle: The flow meter is mainly composed of a conical glass tube expanding from bottom to bottom up and a float that moves up and down with the size of the fluid flow (Figure 3). When the fluid flows up through the cone tube, the lift S generated by the fluid kinetic energy and the buoyancy A of the fluid on the float make the float rise. When the sum of the lift S and the buoyancy A is equal to the float itself gravity G, the float is in equilibrium, stable at a certain height position, and the scale on the cone tube indicates the flow value of the fluid. Glass ROTA METER is widely used in chemical industry, petroleum, light industry, medicine, environmental protection, food and measurement testing, scientific research and other departments, to measure the flow rate of single-phase non-pulsatile fluid (liquid or gas). Corruption resistance glass rotor flow meter has strong corrosion resistance, can detect acid (except hydrofluoric acid), alkali, oxidant and other corrosive gas or liquid flow, suitable for chemical, pharmaceutical, paper, sewage treatment and other industries.

Static Mixer is an efficient mixing device without moving parts. Its basic working mechanism is to use the mixed unit fluid body fixed in the tube to change the flow state of the fluid in the tube, so as to achieve the purpose of good dispersion and full mixing between different fluids. The device is widely used and is not detachable. Structure of the CPVC Static Mixer: usually consists of three parts: shell tube, tube internal mixing unit, and two end flanges (or other connection mode). The casing pipe and flanges at both ends are standard pipe fittings for conventional industry, usually with a nominal diameter of DN15-DN1000. Can be made of stainless steel or carbon steel, can also be made of plastic material, the mixer at both ends can also be straight pipe, can also be thread, clamp, live connection and other connection methods, but also with cold, hot jacket. Mixed units are usually welded in pipes and can be movable under special conditions. Different types of static mixers differ in the internal mixing units, including the number of mixing units, materials, and specifications. The structure of the various types of static mixtures is detailed in the following parameter table. The working principle of the Plastic Static Mixer: PVC Static Mixer working principle, is to let the fluid flow in the pipeline impact various types of plate elements, increase the fluid laminar motion velocity gradient or form turbulence, laminar is "split-position move-rejoin", turbulence, fluid in addition to the above three cases, will be in the section direction of violent vortex, has a strong shear force on the fluid, make fluid further split mixing, final mixing needed to form the emulsion. What is called a "static" mixer means that there are no moving parts in the pipe, only stationary components. When two or more fluids flow through the inner mixing unit in the tube, they undergo multiple segmentation, shear, rotation and refusion, and it realizes the full mixing between the fluids. The fluid mixing mechanism of PVDF Static Mixer is quite different between laminar flow and turbulence. During laminar flow, static mixers rely on the path of the fluid to divide, shift, and then rejoin. Due to the regular and repeated effect of the three mixing elements of "division, one shift and one reconvergence", the mixing is realized. In turbulence, in addition to the above three elements, the fluid is in the direction of the flow section of the violent vortex, resulting in a strong shear force acting on the fluid, which makes the fine part of the fluid is further divided, and then achieve another mixing.

Installation: carefully clean the thread connection surface of all pipes before installing the Plastic Filter, and use the pipe sealant or Teflon tape (PTFE) appropriately. The end threads are not processed to avoid getting the sealant or Teflon tape into the piping system. Y Strainer can be mounted either horizontally or vertically downward. Warning: When installing 1-1 / 4 " (DN32) or larger caliber insert weld filters or all D series filters, note that the gaskets for such filters are non-metallic and prone to damage due to overheating. The welding time should be shortened and the filter should be cooled after welding. If preheating is required before welding or continued heating needs required after welding (the D series filter), it is recommended to remove the gasket and reheat it first. Operation and maintenance of the Plastic Strainer: after the initial operation of the system (generally not more than one week), it should be cleaned to remove the impurities accumulated on the filter screen during the initial operation of the system. Thereafter, it must be cleaned regularly. The number of cleaning times varies according to the working conditions. If the filter is not plugged, remove the filter limits and filters when cleaning the PVC Strainer. Note: The filter shall be separated from the pressure system before each maintenance and cleaning. After cleaning, use a new gasket when reinstalling. Suitable for materials: a. Weak corrosive materials in chemical and petrochemical production, such as water, ammonia, oil products, hydrocarbons, etc.; b. Corrosive materials produced by chemical industry, such as caustic soda, soda ash, concentrated and dilute sulfuric acid, carbonated acid, acetic acid, ester acid, etc.; c. Low-temperature materials in refrigeration, such as liquid methane, liquid ammonia, liquid oxygen and various refrigerants; d. Materials with hygiene requirements in light industry food and pharmaceutical production, such as: beer, beverage, dairy products, grain pulp and medical products, etc.;

Y filter is to remove a small amount of solid particles in the liquid small equipment, can protect the normal work of the equipment, when the fluid into the filter filter, the impurities are blocked, and the clean filter by the filter outlet, when need to cleaning, as long as the removable filter is removed, reloaded after processing, therefore, the use of maintenance is very convenient.Plastic Filter, also known as decontamination, filter valve, is an indispensable device of conveying medium pipeline system, its role is the mechanical impurities in the filter medium, can on the sewage rust, sand, a small amount of solid particles in the liquid filter to protect the equipment pipe accessories from wear and blockage, can protect the normal work of equipment. Y Strainer is Y type, one end is the water flow, one end is the precipitation waste, impurities, usually it is installed in the PVC Pressure Reduce Valve,PVC Back Pressure Valve, water level valve, or other equipment inlet, its role is to remove impurities in the water, to protect the normal operation of the valve and equipment, PVC Strainer to be treated water into the body, water impurities deposited in the stainless steel filter, the resulting in pressure difference. Through the differential pressure switch monitoring inlet pressure difference change, when the differential pressure reaches the set value, the electric controller feed hydraulic control valve, drive motor signal, cause the following actions: motor drives the brush rotation, clean the Plastic Strainer, at the same time, the control valve open for discharge, the whole cleaning process only lasts for tens of seconds, when the end of the cleaning, close the Control Valve, motor stop rotation, the system back to its initial state, began to enter the next filtering process. After the equipment is installed, the technicians shall debug, set the filtration time and the cleaning and conversion time. The water to be treated enters the body from the water inlet, and the filter starts to work normally. Selection principle: 1. Import and export diameter: In principle, the inlet and export diameter of the filter should not be less than the inlet diameter of the matching pump, generally the same with the import pipe diameter. 2. Nominal pressure: determine the pressure level of the filter according to the highest possible pressure in the filter line. 3. Selection of hole number: mainly considering the size of the impurity to be intercepted, and according to the requirements of the medium process. Check the particle size "filter size" below. 4. Quality of filter equipment: the material of the filter is generally the same as the connected process pipe material. For different service conditions, the filter of cast iron, carbon steel, low alloy steel or stainless steel can be considered. 5. Filter resistance loss calculation: for water filter, the pressure loss is 0.52~1.2kpa when the rated flow rate is generally calculated.

Y-type filter is an indispensable filter device for the pipe system of conveying medium. Y-type filter is usually installed at the inlet end of the PVC Safety Valve, PVC Pressure Reduce Valve, fixed water level valve or other equipment to remove impurities in the medium to protect the normal use of valves and equipment. The PVC Strainer has the characteristics of advanced structure, small resistance and convenient sewage discharge. The applicable medium of Plastic Strainer can be water, oil and gas. The general access water network is 18~30 orders, the ventilation network is 10~100 orders, and the access oil network is 100~480 orders. Basket filter mainly consists of receiver, supervisor, blue filter, flange, flange cover and fasteners. When the liquid enters the Y Strainer blue through the supervisor, the solid impurity particles are blocked in the filter blue, and the clean fluid is discharged through the filter blue by the filter outlet. Product classification: 1. Air filter makes the polluted air clean to the state needed for production and life, that is, to make the air reach a certain degree of cleanliness. 2. The liquid filter makes the contaminated liquid clean to the state needed for production and life, that is, so that the liquid reaches a certain degree of cleanliness. 3. The network filter blocks the spam information by setting up, making the information on the computer screen meet the requirements as much as possible. The principle of absorption separates the light of different colors. 4. Light filter to absorb some unwanted light. The above said should be a network filter, in fact, there are many kinds of filters, such as laminated filter, sand filter, carbon filter and so on, the main principle is to use the filter media aperture interception is smaller than the medium aperture material, of course, some filter media also has adsorption and other special effects. Most filter backwashing is not so troublesome, as long as the clean water from the end of the filtered water into the reverse backwashing medium in the filter can achieve a very good backwashing effect. These valves shall generally be installed horizontally in pipes. Features: Y Plastic Filter belongs to the pipe coarse filter series, also can be used for gas or other medium large particulate matter filtration, installed in the pipeline can remove large solid impurities in the fluid, make the machine equipment (including compressor, pump, etc.), instrument can work normally and operation, achieve stable process, ensure the safety of production. Y-type filter (water filter) has the advantages of simple production, easy installation and cleaning, and large amount of pollution.