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.