The valve is a pipeline accessory used to open and close the pipeline, control the flow direction, adjust and control the parameters (temperature, pressure and flow) of the transmission medium. The valve is the control component in the fluid transmission system, which has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. Understanding the function and function of the valve can make us better understand it.

I What are the functions of the valve?

(1) Cut off: almost all valves have cut-off function. Gate valves and ball valves can be used for cutting off without regulating the flow. When rapid cutting off is required, cocks, ball valves and butterfly valves are more suitable. The stop valve can adjust the flow and cut off. Butterfly valve can also be used for large flow regulation.

(2) Change the flow direction: select two-way (L-shaped channel) or three-way (T-shaped channel) ball valves or cocks, which can quickly change the flow direction of materials. Because one valve plays the role of more than two through valves, it can simplify the operation, make the switching accurate, and reduce the occupied space.

(3) Regulation: the stop valve and plunger valve can meet the general flow regulation, and the needle valve can be used for micro fine adjustment; The throttle valve is suitable for stable (pressure, flow) Regulation in a large flow range.

(4) Check valve: check valve can be selected when it is necessary to prevent material backflow.

(5) Valves with additional functions can be selected for different production processes, such as valves with jackets, exhaust ports and bypasses, and valves with blowing ports to prevent the sedimentation of solid particles.

II What are the functions of valves?

The function of the valve is actually based on the type of valve.

1. Safety valve is a valve that prevents the medium pressure from exceeding the specified value and plays a safety role.

2. Vacuum includes vacuum ball valve, vacuum baffle valve, vacuum charging valve, pneumatic vacuum valve, etc. Its function is to change the direction of air flow, adjust the size of air flow, and cut off or connect the pipeline in the vacuum system, which is called vacuum valve

3. Shut off valve

This kind of valve is used for opening and closing. It is permanently installed on the inlet and outlet of cold and heat sources, the inlet and outlet of equipment, and the branch line of pipeline (including riser), and can also be used as drain valve and vent valve. Common shut-off valves include gate valve, globe valve, ball valve and butterfly valve.