Pressure control valve unit

Details Pressure control valve unit Pressure control valve unit

1991-04-08

1992-12-29

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762565, F15B 13043, F15B 13044

Patent

active

051743388

ABSTRACT:
A pressure control valve unit includes a valve housing formed with a valve bore. The valve housing is also formed with an inlet port, a drain port and a control port. A valve spool is disposed in the valve bore for selectively establishing fluid communication between the control port and the inlet port, and between the control port and the drain port. The drain port is connected to a first drain path which selectively establishes and blocks fluid communication between the drain port and a working fluid source and to a second drain path which normally connect the drain port to the working fluid source. A flow restricting orifice is provided in the second drain path for constantly permitting limited flow rate of the working fluid from the drain port and the working fluid source. The flow restricting orifice generates damping force for damping surge pressure.

REFERENCES:
patent: 3856047 (1974-12-01), Tarayama
patent: 4119294 (1978-10-01), Schnorrenberg
patent: 4316599 (1982-02-01), Bouvet et al.
patent: 4321941 (1982-03-01), Hunschede et al.
patent: 4491153 (1985-01-01), Bartholomaus
patent: 4875501 (1989-10-01), Ichihashi et al.
patent: 5042832 (1991-08-01), Takahashi et al.

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