Differences and characteristics of various valves

Differences and characteristics of various valves

1. Classification by function and use;

(1) Block valve: also known as closed-circuit valve, it is used for;

(2) Check valve: also known as one-way valve or check valve, its function is:;

(3) Safety valve: safety valve is used to prevent pipeline or device from being damaged;

(4) Regulating valve: regulating valve includes regulating valve, throttle valve and pressure reducing valve;

(5) Diverter valve: Diverter valves include various distribution valves and steam traps,;

(6) Exhaust valve: the exhaust valve is an indispensable auxiliary element in the pipeline system;

2. Classification according to nominal pressure;

(1) Type of valve

1. Classification by function and use

(1) Block valve: also known as closed-circuit valve, it is used to connect or block the medium in the pipeline. Block valves include gate valves, globe valves, plug valves, ball valves, butterfly valves, diaphragm valves, etc.

(2) Check valve: also known as one-way valve or check valve, it is used to prevent the medium in the pipeline from backflow. Its main function is to prevent the backflow of medium, reverse rotation of pump and drive motor, and discharge of container medium. The bottom valve of the water pump is also a check valve.

(3) Safety valve: the function of safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.

(4) Regulating valves: regulating valves include regulating valves, throttle valves and pressure reducing valves, which are used to regulate the pressure, flow and other parameters of the medium.

(5) Diverter valve: Diverter valves include various distribution valves and steam traps, which are used to distribute, separate or mix the medium in the pipeline.

(6) Exhaust valve: the exhaust valve is an indispensable auxiliary component in the pipeline system, which is widely used in boilers, air conditioners, oil and gas, water supply and drainage pipelines. It is often installed at the commanding point or elbow to eliminate excess gas in the pipeline, improve the service efficiency of the pipeline and reduce energy consumption.

2. Classification according to nominal pressure

(1) Vacuum valve: refers to the valve whose working pressure is lower than the standard atmospheric pressure.

(2) Low pressure valve: refers to the valve with nominal pressure PN ≤ 1.6Mpa.

(3) Medium pressure valve: refers to the valve with nominal pressure PN of 2.5, 4.0 and 6.4 Mpa.

(4) High pressure valve: it refers to the valve with the scale pressure PN of 10~80Mpa.

(5) Ultra high pressure valve: refers to the valve with nominal pressure PN ≥ 100Mpa.

3. Classification according to operating temperature

(1) Ultra low temperature valve: used for valves with medium operating temperature t<- 100 ℃.

(2) Low temperature valve: used for valves with medium working temperature of - 100 ℃ ≤ t ≤ - 29 ℃.

(3) Normal temperature valve: for medium working temperature - 29 ℃

(4) Medium temperature valve: used for valves with medium working temperature of 120 ℃≤ t ≤ 425 ℃.

(5) High temperature valve: used for valves with medium operating temperature t>450 ℃.