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Pneumatic control valve principle and related test content

As China's industrial modernization continues to thrive in development, the demand for valves also grows. With the current chemical companies, the use of thousands of valves is required to enable companies to operate well. With the ever-increasing labor costs, automatic control has gradually replaced manual operating systems, especially in some of the more dangerous places, the use of automated devices can minimize the degree of injury to people, so in some petrochemical industries, pneumatic The regulator valve is one of the most commonly used valves. So, what exactly is a pneumatic control valve? Let's take a look at it below.
First, the working principle of pneumatic control valve
The so-called pneumatic control valve, refers to the pneumatic actuator and the valve to form the adjustment device, through the air compression as a power source, the actuator is a cylinder, while the use of electrical valve positioner, solenoid valve, converter and other components Common operation to drive the valve, prior to the switch and proportional adjustment, through the control signal to complete a variety of process parameters. The characteristics of this working principle make it necessary for people to perform certain pressure tests on the valve parts when using pneumatic control valves, so as to ensure the normal operation of the valves.
Second, how should the pneumatic control valve be detected
As the most widely used in chemical industry is the pneumatic control valve, and according to the special circumstances of its use, it is very necessary to perform certain tests on the pneumatic control valve before use.
1, check the relevant parts of the pneumatic actuator
For the pneumatic actuator part of the pneumatic control valve, it should be tested whether its pressure strength is over. When the valve is fully opened, the medium can be selected as clean water, and a detection pressure equivalent to 1.5 times the nominal pressure is used. At this pressure, all operating valve chambers can withstand pressure for not less than 3 minutes. And there should be no leakage during the test.
2, check the valve parts
Valve parts should be tested for their compressive strength and sealing performance. Use room temperature water level media, input to the valve body in a certain direction, and can withstand the detection pressure in the valve operation for not less than 3 minutes, there will be no leakage problems.
Learn more about these related to pneumatic control valve to use it better.

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