Graphic, a reduced pressure pneumatic valve working principle diagram (figure)

when none of the reduced pressure pneumatic valve outlet water or reduced pressure downstream of the pneumatic valve is closed, the outlet pressure continues to increase, F continuous change, under the pressure of diaphragm promoted continually movement upwards until reduced pressure pneumatic diaphragm valve is closed, the reduced pressure pneumatic valve outlet pressure is greater than the set value, but because of inertia effect, upward movement of the diaphragm will not stop immediately, will continue to move up a little, equivalent to the exit of pneumatic valve cavity, volume change, internal liquid pressure drop, until just equals the export of reduced pressure pneumatic valve set pressure value.