Proportional pressure reducing valve

Details Proportional pressure reducing valve Proportional pressure reducing valve

1989-07-19

1991-03-26

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

F15B 1344

Patent

active

050020919

ABSTRACT:
A proportional pressure reducing valve includes a spool having a first end connected to a solenoid and a second end exposed to a feedback chamber. The spool is formed with a groove for allowing a supply port to communicate with an output port when the spool is driven by the solenoid in proportion to solenoid current under balanced condition of an axial force of the solenoid and feedback pressure. The pressure reducing valve further comprises a pressure reduction valve including a second spool formed with a path, for relieving hydraulic pressure within the feedback chamber to the drain port, when output port pressure rises a predetermined relief pressure, to sharply increase the output port pressure up to the supply pressure in proportion to the current passed through the solenoid.

REFERENCES:
patent: 4365647 (1982-12-01), Taylor et al.
patent: 4899785 (1990-02-01), Inokuchi

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