Component failure protection valve with overpressure opening

A hydraulic system provides failure protection e.g. hose burst, by incorporating an isolator 72 adjacent a hydraulic actuator 16. The isolator has a first port 73 connected to the actuator and a second port 75 with an electrically operated isolation valve 74 connected between those ports which is bi...

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Bibliographische Detailangaben
1. Verfasser:	DWIGHT B STEPHENSON
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HAULING HEATING HOISTING HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD HYDRAULICS OR PNEUMATICS IN GENERAL LIFTING LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A hydraulic system provides failure protection e.g. hose burst, by incorporating an isolator 72 adjacent a hydraulic actuator 16. The isolator has a first port 73 connected to the actuator and a second port 75 with an electrically operated isolation valve 74 connected between those ports which is biased open by actuator chamber 48 pressure. A pressure relief valve 78 responds when chamber pressure exceeds a given level by relieving pressure on the isolator valve enabling the isolation valve to open without application of electricity and release the pressure in the hydraulic actuator. The isolator valve may have a leakage path between its ports to enable communication of chamber pressure to a pressure sensor 81. A Wheatstone bridge control valve 44 assembly is remote from the hydraulic actuator and connected to the second port for metering flow of fluid between a source and the hydraulic actuator.