When the signal pressure disorders, more than (overpressure type) or below (loss of pressure type) cut-off valve pressure setting, sensors in the pneumatic membrane drives the collision block move, make the trip mechanism movement, in a closed spring, under the action of the main valve disc quickly close the valve port, to protect the role of the voltage regulator and measuring instruments and other downstream equipment.
The working principle of
As used in the main film inferior vena surge tank (stand) export pressure to tossing in the start-up pressure, it overcome the regulating spring force drives the pull rod upward movement, under the action of the lever, the stem moves down to open the main valve disc, discharge gas. When the pressure for gas emissions fell to a start-up pressure setting, stem up, under the action of the disc in a reset spring valve mouth closed.
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