Hydraulic spool valves with controlled by-pass

Details Hydraulic spool valves with controlled by-pass Hydraulic spool valves with controlled by-pass

Filed on

1981-04-24

Date issued

1983-11-08

Examiner

Michalsky, Gerald A.

Patent Class

Fluid handling

SubClass

Systems

SubSubClass

Supply and exhaust

Other Related Categories

13762568, F15B 1304

Type

Patent

Status

active

Patent number

044136501

Description

ABSTRACT:
A hydraulic spool valve is provided for controlling the flow of fluid between a pump, a consumer of hydraulic energy and a reservoir which spool has pressure controlled by-pass means by-passing fluid from the fluid inlet of the valve to tank while the valve is moving from a neutral to a work position and the reverse thereof at a pre-selected pressure level.

REFERENCES:
patent: 4117862 (1978-10-01), Qureshi

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