Selection of electric plastic ball valve

With the increasing proportion of plastic pipeline in cold and hot water supply and industrial pipeline engineering, the quality control of plastic valve in pipeline system becomes more and more important. Due to the advantages of light weight, corrosion resistance, non adsorption of scale, integrated connection with plastic pipeline and long service life, the application of plastic valve in the plastic pipeline system of water supply (especially hot water and heating) and other industrial fluids is incomparable with other valves. At present, there is no reliable method to control the selection of the application scope of electric plastic ball valve in China, which results in the uneven quality of plastic valve products for water supply and other industrial fluids, the lax closure and serious leakage in the engineering application, forming a statement that plastic valve can not be used, affecting the overall development of plastic pipe application. In China, the national standard for selection of application scope of electric plastic ball valve is in the process of formulation, and its product standard and method standard are all formulated according to international standards.

The main types of plastic valves in the world are ball valve, butterfly valve, check valve, diaphragm valve, gate valve and stop valve, etc. the structural forms mainly include two-way, three-way and multi-way valves, and the raw materials mainly include ABS, PVC-U, PVC-C, Pb, PE, PP and PVDF, etc.

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Selection of application scope of electric plastic ball valve:

Butt welding connection: the outer diameter of the valve connection part of the electric plastic ball valve is equal to the outer diameter of the pipe, and the end face of the valve connection part is welded relative to the end face of the pipe;

Socket bonding connection: the connection part of electric plastic ball valve is in the form of socket, which is bonded with pipe fittings;

Electric fusion socket connection: the connection part of the electric plastic ball valve is the socket type with inner diameter laying of electric hot wire, which is connected with the pipe by electric fusion;

Socket hot-melt connection: the connection part of the electric plastic ball valve is in the form of socket, which is connected with the pipe by hot-melt socket;

Socket bonding connection: the connection part of the electric plastic ball valve is in the form of socket, which is bonded with the pipe;

Connection of rubber sealing ring at the socket: the connection part of the valve is the socket type with rubber sealing ring inlaid, which is connected with the pipe by socket;

Flange connection: the valve connection part is in the form of flange, which is connected with the flange on the pipe;

Threaded connection: the connection part of the valve is in the form of thread, which is connected with the thread on the pipe or pipe fitting;

Flexible connection: the connection part of the valve is in the form of flexible connection, which is connected with the pipe or pipe fitting.

A valve can have different connections at the same time.

Advantages of electric plastic ball valve:

The electric plastic ball valve actuator is used to drive the valve to the fully open or fully closed position. The electric actuator used to control the valve can accurately move the valve to any position. Although most of the electric actuators are used to switch the valve, the design of the electric actuators today goes far beyond the simple switch function, they include position sensing device, torque sensing device, electrode protection device, logic control device, digital communication module and PID control module, and all of these devices are installed in a compact shell.

Because more and more factories adopt the automatic control of electric plastic ball valve, and the manual operation is replaced by machinery or automation equipment, people require that the actuator of electric plastic ball valve can play the interface role between the control system and the mechanical movement of the valve, and also require the actuator to enhance the work safety performance and environmental protection performance. In some dangerous situations, the electric plastic ball valve automatic actuator device can reduce personal injury. Some special valves require emergency opening or closing under special circumstances. The electric actuator of electric plastic ball valve can prevent the further spread of danger and minimize the loss of the plant. For some high-pressure large caliber valves, the output torque of the actuator required for the electric plastic ball valve is very large. At this time, the required actuator must improve the mechanical efficiency and use the high output motor, so as to operate the large caliber valve smoothly. For some small torque valves, fine and small electric valves are also used, which have the advantages of light weight, compact structure and complete functions.