Lock valve flow control arrangement

Details Lock valve flow control arrangement Lock valve flow control arrangement

1975-03-25

1977-03-15

Cohen, Irwin C.

Work holders

Miscellaneous

91420, 91447, A61G 1300, F15B 13042

Patent

active

040120317

ABSTRACT:
A unitary pilot-operated bi-directional cylinder lock valve and pressure-compensated flow control valve arrangement, having a common housing with internal porting connecting a pair of oppositely acting normally closed check valves operated to open by fluid pressure in one direction thereagainst on the inlet side and by a common free-floating inlet-pressure-responsive pilot piston therebetween. Also in the common housing and ported in line with each of the check valves are two pressure-compensated flow control valves which restrict fluid flow through the check valves as a function of flow pressure. The pressure-compensated flow control valves are also oppositely acting and each senses and acts to reduce fluid flow in response to pressure build-up in an opposite direction from that of the other. The unitary lock valve and pressure-compensated flow control valve is connected in line with one or more hydraulic cylinders of an operating table or other hydraulic cylinder-operated apparatus, with the exit/entrance ports from the pressure-compensated flow control valves connected to the opposite ends of the hydraulic cylinder or cylinders.

REFERENCES:
patent: 2845086 (1958-07-01), Waterman et al.
patent: 3041120 (1962-06-01), Burzlaff et al.
patent: 3072107 (1963-01-01), Cassell
patent: 3207177 (1965-09-01), Nevulis
patent: 3285282 (1966-11-01), Martin
patent: 3302922 (1967-02-01), Gregor et al.
patent: 3319648 (1967-05-01), Donner
patent: 3576192 (1971-04-01), Wood et al.
patent: 3728941 (1973-04-01), Cryder
patent: 3818936 (1974-06-01), Jackoboice et al.
patent: 3857404 (1974-12-01), Johnson

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