Hsien Peng Wang

US Patent:

46116206, Sep 16, 1986

Filed:

Apr 2, 1981

Appl. No.:

6/250398

Inventors:

Hsien B. Wang - Newport Beach CA

Assignee:

Parker Hannifin Corporation - Cleveland OH

International Classification:

F15B 1108

US Classification:

137100

Abstract:

A hydraulic circuit breaker for use with a hydraulic device comprising a body having a supply conduit for supplying hydraulic fluid under pressure to the hydraulic device and a return conduit for carrying hydraulic fluid away from the hydraulic device. A slide valve is mounted for movement in a first chamber of the body to define a supply orifice of variable area in the supply passage and a return orifice of variable area in the return passage. The slide valve is positioned in the body as a function of the pressure drop across at least one of the orifices. A pressure responsive member is mounted for movement in the body and moves in response to the pressure drop across the supply orifice reaching a predetermined value. A movable drive member extends into both of the chambers so that it can transmit at least some of the motion of the pressure responsive member to the slide valve to move the slide valve to close the supply and return orifices.