SOLENOID OPERATED PRESSURE REGULATION

摘要

PCT No. PCT/US82/01060 Sec. 371 Date Aug. 4, 1982 Sec. 102(e) Date Aug. 4, 1982 PCT Filed Aug. 4, 1982 PCT Pub. No. WO84/00627 PCT Pub. Date Feb. 16, 1984.A normally closed line pressure regulator valve has an orifice that is opened and closed as the coil of the solenoid is energized and deenergized. When the valve is opened, the pump outlet is opened to a vent port. A line pressure relief valve in parallel with the solenoid valve opens at a predetermined pressure when the solenoid valve is closed and establishes a maximum line pressure. Minimum line pressure is determined by the pressure drops across orifices located between the outlet of the pump and the vent port. Line pressure is regulated between the maximum and minimum values by energizing and deenergizing the solenoid coil.