Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1978-02-17
1980-07-01
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
91441, 91451, 1374935, F16K 1718
Patent
active
042101700
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 first mode to block fluid flow between the first and second chambers, for operating in a second mode to permit fluid flow from the first chamber to the second chamber only when the pressure in the first chamber exceeds the pressure in the second chamber by a first predetermined amount, and for operating in a third mode to permit fluid flow from the second chamber to the first chamber only when the pressure in the second chamber exceeds the pressure in the first chamber by a second predetermined amount. 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 movable valve element having a sealing portion for engaging the valve seat of the stationary portion when the movable valve assembly is operating in the first and second modes. The movable valve assembly further has a valve seat and a poppet mechanism is provided for sealingly engaging the valve seat of the movable valve element when the movable valve assembly is operating in the first and third modes.
REFERENCES:
patent: 115982 (1871-06-01), Porteous
patent: 977736 (1910-12-01), Hanson
patent: 1229885 (1917-06-01), Chadwick
patent: 1326124 (1919-12-01), Vischer
patent: 3112763 (1963-12-01), Tennis
patent: 3125117 (1964-03-01), Borgard
patent: 3554214 (1971-01-01), Stenlund
patent: 3604450 (1971-09-01), Botkin
patent: 3699999 (1972-10-01), Dunkelis
patent: 3939866 (1976-02-01), Pignatelli
FitzGerald Thomas R.
General Signal Corporation
Mednick Jeffrey S.
Nilson Robert G.
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