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Understand the working principle of pneumatic regulating valve

What is a pneumatic valve? In short, the compressed air is used as a power regulating valve. Due to its fast action response, simple construction and safe operation, pneumatic control valves are highly appreciated by consumers. Because in the flammable and explosive working environment, it can be widely used in automatic control systems for various working conditions without the need for riot prevention measures. Of course, consumers should carefully understand the working principle of the pneumatic control valve when purchasing the appropriate regulator valve.
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It should be noted that pneumatic control valve usually has two kinds of actions, namely air-open type and air-close type. Air-operated pneumatic control valve will increase the air pressure above the membrane head of the actuator during use. At this time, the valve will operate in the direction of increasing the opening. When the input air pressure reaches the upper limit, the valve will be in the fully open state. If the air supply pressure is reduced or cut off, the valve will be in the auto-off state at this time, so it is also called a fault shut-down line. The other way around, air conditioning regulators will push the valve in the closing direction under the premise of increasing air pressure. When the input air pressure reaches the upper line, the valve will be fully closed. Of course, consumers need to choose the right way of action according to their own operating conditions.

In the above, the air-opening type control valve was briefly introduced. In the process of use, it is necessary to configure the positioner, converter, position valve, solenoid valve and other accessories according to the working conditions, so as to better exert the adjustment effect. . Simply introduce the positioner, which is an important accessory for pneumatic control valve. How does it play? And listen to Xiao Bian slowly come: When used, the control system will send a signal to the positioner, and then the positioner sends a signal to control the pneumatic control valve. In the case of an open-type pneumatic control valve, after the actuator enters the pressure, the thrust disk will move downwards at this time, and the spring presents a compression state, which drives the push rod, the valve rod, etc. to move downwards, and the valve core cannot move. Open the valve seat and the compressed air will circulate.

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