Patent ID: 9624922
Date: 2017-04-18
CPC Classifications: F04B,Y10T

Claim:
1. A pressure monitoring device for controlling a compressor having a first signal port and a second signal port, the device comprising: an input air connector connectable to an air reservoir and configured to receive an input pressure from the air reservoir; a first signal air connector configured to output a pneumatic ON-load signal to the first signal port of the compressor to adjust the compressor to an operation mode; a second signal air connector configured to output a pneumatic OFF-load signal to the second signal port of the compressor for adjusting the compressor to a non-operation mode; a governor body; a slidable piston disposed in the governor body, the piston being preloadable in a first direction by a spring, the piston being connectable to the input air connector, the piston being chargeable by the input pressure supplied to the input air connector to exert a pressure force onto the piston in a second direction opposite to the first direction; a pressure plunger chargeable by the input pressure for movement in the second direction; a first connection between the input air connector and the first signal air connector, the first connection being separable; and a second connection between the input air connector and the second signal air connector, the second connection being separable; wherein, when the input pressure exceeds a predefined pressure limit, the pressure plunger is pushed by the input pressure in the second direction to separate the first connection and further open the second connection for outputting the input pressure as the pneumatic OFF-load signal out of the second signal air connector; and wherein, when the input pressure does not exceed the predefined pressure limit, the pressure plunger is not pushed in the second direction, the first connection is not separated, and the input pressure is outputted as the pneumatic ON-load signal out of the first signal air connector.