Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1980-01-31
1981-11-17
Cline, William R.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
1374935, 1374936, 91441, 91451, F16K 1718
Patent
active
043005918
ABSTRACT:
A hydraulic system including at least one hydraulic cylinder is provided with an anti-cavitation and overload relief valve having a housing, a first chamber within the housing in fluid communication with one end of the cylinder, and a second chamber within the housing in fluid communication with a fluid reservoir. A fluid passageway within the valve housing connects the first and second chambers. A movable valve assembly is positioned within the fluid passageway for operating in a plurality of modes for providing anti-cavitation and overload relief. The valve includes a stationary portion positioned within the fluid passageway between the first and second chambers having a valve seat. The movable valve assembly includes a poppet mechanism for sealingly engaging a valve seat of the movable valve element when the movable valve assembly is operating in first and third modes. A tang on the head of the poppet engages a reduced diameter portion of the stationary valve element in order to maintain fluid communication between the first and second chambers during the second mode of operation. An axial extension of a poppet spring seat limits the travel of the movable valve during the third mode of operation and limits the stress on a poppet spring.
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Cline William R.
FitzGerald Thomas R.
General Signal Corporation
Mednick Jeffrey S.
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