Electrically controlled pilot operated pressure regulator valve apparatus and method of operation of the same.

摘要

The apparatus uses an electrical signal controlled valve (34), for instance, a proportional solenoid controlled valve, controlled by a controller (40), to control a pilot operated valve (32) for regulating pressure of fluid in a port (44) thereof in connection with a fluid operated system (16, 18, 20, 30). A pressure sensor (38) in connection with the port (44) is used to monitor the regulated pressure. The regulated pressurized fluid in the port (44) is also used, as required, as a component of the pilot signal. The valves are configured such that when the electrical control signal is absent or the electrically controlled valve is unresponsive thereto, the presence of pressurized fluid at a predetermined supply pressure, will automatically operate the pilot operated valve (32) in cooperation with a biasing element (54) thereof, for delivering pressurized fluid at a minimum or reduced regulated pressure.