EP 0330575 B1 19930421 - HYDRAULIC CIRCUIT COMPRISING A SAFETY VALVE FOR A HYDRAULIC ACTUATOR
Title (en)
HYDRAULIC CIRCUIT COMPRISING A SAFETY VALVE FOR A HYDRAULIC ACTUATOR
Publication
Application
Priority
FR 8802289 A 19880225
Abstract (en)
[origin: JPH0231085A] PURPOSE: To assure safety of a user even when breakage is generated in a hose in a control circuit to operate a load by providing pressure relief valve capable of sending a flow from an outlet to a control inlet from a specified pressure threshold value. CONSTITUTION: A selectively operable valve 17 exists between inlets A and B, this valve 17 has two positions, and one of them is selected in accordance with a control pressure applied to an inlet Z. One position corresponds to an intermediate position between A and B in a non-return valve to prevent circulation from the inlet B to A. The other position enables free circulation between the inlets B and A. Between the inlets B and Z, a calibration pressure relief valve 18 exists, and this valve 18 enables circulation from the inlet B to Z at a limited threshold value or over for pressure in a chamber 1A.
IPC 1-7
IPC 8 full level
B64C 13/40 (2006.01); F15B 13/01 (2006.01); F15B 20/00 (2006.01); F16K 15/18 (2006.01); F16K 17/04 (2006.01)
CPC (source: EP US)
F15B 13/015 (2013.01 - EP US); Y10T 137/87499 (2015.04 - EP US); Y10T 137/87563 (2015.04 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0330575 A1 19890830; EP 0330575 B1 19930421; AT E88548 T1 19930515; DE 68906056 D1 19930527; DE 68906056 T2 19940120; FR 2627838 A1 19890901; FR 2627838 B1 19910111; JP H0231085 A 19900201; US 4936032 A 19900626
DOCDB simple family (application)
EP 89400508 A 19890223; AT 89400508 T 19890223; DE 68906056 T 19890223; FR 8802289 A 19880225; JP 4508089 A 19890223; US 31131589 A 19890215