Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1978-07-27
1980-09-23
Cohen, Irwin C.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
91420, 251 52, F15B 13042, G05D 700
Patent
active
042236932
ABSTRACT:
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 continuous exhaustion of hydraulic fluid from the cylinder 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 relief valve surface which engages in the annular channel 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 includes a flange of slightly less dimension than the inner diameter dimension of the outer barrel resulting 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.
REFERENCES:
patent: 2667896 (1954-02-01), Kanuch
patent: 2698730 (1955-01-01), Ensminger
patent: 3015316 (1962-01-01), Thomas
patent: 3665810 (1972-05-01), Parrett
patent: 3799032 (1974-03-01), Honeycutt
patent: 3817154 (1974-06-01), Martin
patent: 3955478 (1976-05-01), Feucht
patent: 3972557 (1976-08-01), Hudston et al.
patent: 4026192 (1977-05-01), Noren et al.
Cohen Irwin C.
Modular Controls Corporation
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