F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/82
F15B 13/00 (2006.01) F15B 13/01 (2006.01)
Patent
CA 1093425
Abstract of the Disclosure A counterbalance valve assembly for use in a hydraulic system of the type including a hydraulic cylinder for raising and lowering a load provides gradual and con- tinuous exhaustion of hydraulic fluid from the cylin- der to facilitate smooth lowering of the load. The assembly includes a counterbalance valve having an outer barrel and an inner barrel forming an annular channel therebetween through which the exhausted fluid passes. The outer barrel includes an inner valve seat and the inner barrel includes an outer re- lief valve surface which engages in the annular chan- nel to form a relief valve. The inner barrel is movable in a linear direction within the outer barrel for opening and closing the relief valve as the load is lowered. To avoid abrupt changes in the exhausted cylinder fluid flow rate, and thus to avoid abrupt variations in the load lowering rate, the relief valve surface has a long tapered configuration rendering the exhausted fluid flow rate less sensitive to inner barrel movement. Additionally, the inner barrel in- cludes a flange of slightly less dimension than the inner diameter dimension of the outer barrel re- sulting in an annular space therebetween. Fluid is therefore allowed to fill an outer barrel chamber opposite the inner barrel forming a dashpot means for dampening inner barrel movement. As a result, the long tapered relief valve surface and the valve dashpot are operative individually and collectively to avoid abrupt closure of the relif valve for pro- viding gradual and continuous exhaustion of the cylin- der fluid and thus gradual and continuous lowering of the load
329581
Modular Controls Corporation
Smart & Biggar
LandOfFree
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