Automatic pressure relief system for a hydraulic motor

Details Automatic pressure relief system for a hydraulic motor Automatic pressure relief system for a hydraulic motor

1989-11-09

1991-05-28

Bartuska, F. J.

Material or article handling

Vertically swinging load support

Grab

60493, 91420, 137106, B66C 142

Patent

active

050189352

ABSTRACT:
A check valve assembly having first and second check valves and an unseating spool is positioned between a control valve and a rotary motor. The unseating spool is elongated so that it continually contacts the valve elements of the check valves. The check valve hydraulically coupled to the higher pressure supply/return line drives the unseating spool against the valve element of the other check valve opening it and connecting the associated supply/return line having lower hydraulic pressure to reservoir through the direction control valve.

REFERENCES:
patent: 3933167 (1976-01-01), Byers, Jr.
patent: 4005894 (1977-02-01), Tucek
patent: 4586332 (1986-05-01), Schexnayder
patent: 4712377 (1987-12-01), Yoshida et al.

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