Pneumatic V-type control valve works: The right of the stomatal intake, the actuator internal to both sides of the piston, driven by the middle of the output shaft rolling, travel angle just 90 degrees, the valve fully open. The left of the stomatal intake, the actuator internal piston to move to the middle, driven by the middle of the output shaft rolling, travel angle is 90 degrees, the valve is fully closed. Simply put is on the right hole vent valve open, on the right of the vent hole valve, if the scene of gas source failure, sudden gas, the valve to maintain its original position.
