EP 0036761 A2 19810930 - Fluid circuit with load check valve.
Title (en)
Fluid circuit with load check valve.
Title (de)
Hydraulischer Kreislauf mit Rückschlagventil.
Title (fr)
Circuit hydraulique avec clapet anti-retour.
Publication
Application
Priority
US 8000321 W 19800324
Abstract (en)
The spool-type load check valve (20) of this invention, used in conjunction with additional check valves (60, 61) overcomes the problem of leakage in conventional spool type check valves by providing a series of interconnecting passages and chambers (36) for communicating equalized fluid pressure from a cylinder (11) to either end of the spool (27) thereof to provide for minimal leakage. When a pair of such cylinders (11, 12) are utilized, the load check valves (20, 20 min ) associated therewith are interconnected by a balance line (50) and resolver valves (47 min ) ensure equalization of fluid pressure in the cylinders upon actuation thereof and also a gradual descent of a load carried by the cylinders upon loss of fluid pressure between the check valves.
IPC 1-7
IPC 8 full level
F15B 11/08 (2006.01); F15B 13/01 (2006.01)
CPC (source: EP)
F15B 13/01 (2013.01)
Designated contracting state (EPC)
BE DE FR GB
DOCDB simple family (publication)
EP 0036761 A2 19810930; EP 0036761 A3 19820407; JP S57500347 A 19820225; WO 8102768 A1 19811001
DOCDB simple family (application)
EP 81301185 A 19810319; JP 50256080 A 19800324; US 8000321 W 19800324