Valve spool with cross drill ports

Details Valve spool with cross drill ports Valve spool with cross drill ports

1984-12-07

1987-04-21

Schwadron, Martin P.

Fluid handling

Systems

Multi-way valve unit

13762522, 13762547, 251283, F16K 3906, F16K 11085

Patent

active

046588590

ABSTRACT:
A four-way valve is provided, for selectively interconnecting pressure supply and return lines with control pressure lines of a hydraulic device, having means for independently balancing the valve against pressures exerted on the valve by any one or more of the pressure lines and at any operating position of the valve. These pressures exerted on the valve would otherwise restrict or prevent actuation of that valve. This balancing means exposes a minimum surface area of the valve to high pressure forces and isolates the fluid pressure in the pressure lines until interconnection is made by valve actuation.

REFERENCES:
patent: 1342900 (1920-06-01), McGillivray
patent: 1657841 (1928-01-01), Peris
patent: 1796808 (1931-03-01), Roberts
patent: 2182459 (1939-12-01), Vickers
patent: 2229933 (1941-01-01), Parker
patent: 2313257 (1943-03-01), Nelson
patent: 2745434 (1956-05-01), Stevenson
patent: 2749941 (1956-06-01), Gardner
patent: 2938544 (1960-05-01), Simpson
patent: 3199539 (1965-08-01), Leathem
patent: 3430919 (1969-03-01), Frazier
patent: 3774634 (1973-11-01), Bonney
patent: 3814378 (1974-06-01), Wurzburger

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