Counter balance valve

Details Counter balance valve Counter balance valve

Filed on

1998-10-19

Date issued

2000-02-29

Examiner

Michalsky, Gerald A.

Patent Class

Fluid handling

SubClass

Self-proportioning or correlating systems

SubSubClass

Supply and exhaust type

Other Related Categories

91420, F15B 1304

Type

Patent

Status

active

Patent number

060296895

Description

ABSTRACT:
A communication area of a left pressure reception chamber, a pressure reception chamber, a right pressure reception chamber and another pressure reception chamber for moving a spool to first and second positions with a first pump port and a second pump port is made large at the beginning of a stroke, small at the intermediate of the stroke and medium at the end of the stroke so as to return the spool from the first and second positions to the neutral position in a short time while preventing cavitation from occurring. While the volume of the pressure reception chamber located opposite to the moving direction of the spool is prevented from changing, the spool is moved slowly in the above-described opposite direction. Thus, the spool is prevented from making an over-stroke and also prevented from having a hunching even if a return pressure oil has a large change in pressure.

REFERENCES:
patent: 5113894 (1992-05-01), Yoshida

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