Can the expert tell us about the structure and working principle of pneumatic valve?

It consists of V-shaped valve body, pneumatic actuator, positioner and other accessories. There is an inherent flow characteristic with approximately equal percentage ratio; Adopt double bearing structure, small starting torque, excellent sensitivity and induction speed; Super shearing ability.

Working principle:

Pneumatic piston actuator takes compressed air as the power source, and the crank arm rotates 90 degrees through the movement of the piston, so that the valve automatically opens and closes. Its components are: adjusting bolt, actuator box, crank arm, cylinder body, cylinder shaft, piston, connecting rod and universal shaft.

Working principle of pneumatic control valve: Pneumatic control valve is composed of executive mechanism and regulating mechanism. The actuator is the thrust component of the regulating valve, which generates corresponding thrust according to the pressure of the control signal to push the regulating mechanism to move. The valve body is the regulating part of the pneumatic regulating valve, which is in direct contact with the regulating medium to regulate the flow of fluid.

Extended data

Performance requirements:

When a valve of a certain specification is mass-produced, an authoritative organization shall be entrusted to conduct the following performance tests:

1, the opening and closing torque of the valve under working pressure;

2. Under the working pressure, it can ensure the continuous opening and closing times of the valve and close it tightly;

3. Detection of valve flow resistance coefficient under the condition of pipeline water delivery.

The valve shall be tested as follows before leaving the factory:

1. When the valve is opened, the valve body shall bear an internal pressure test twice the working pressure of the valve;

2. When the valve is closed, both sides bear 1. 1 times the working pressure of the valve without leakage; However, the leakage value of metal sealing butterfly valve is not greater than the relevant requirements.

References:

Baidu encyclopedia-pneumatic valve