Hydraulic control valve

Details Hydraulic control valve Hydraulic control valve

2007-12-11

2007-12-11

Rivell, John (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S312000, C137S625660, C251S356000, C251S367000

Reexamination Certificate

active

11006353

ABSTRACT:
A tandem hydraulic valve comprising first and second axially aligned valve spools, a valve guide slidably receiving said valve spools to control, in use, the connection between respective ports of the valve guide, said first and second spools being formed as separate components and being axially interconnected, to move in unison, by an axial connection component, and, the interface of said first and second spools being connected to a predefined, external, hydraulic fluid leakage path.

REFERENCES:
patent: 2747611 (1956-05-01), Hewitt
patent: 2994347 (1961-08-01), Gottwald
patent: 3081794 (1963-03-01), Lucien
patent: 3240124 (1966-03-01), Howard et al.
patent: 3698435 (1972-10-01), Evans
patent: 3757817 (1973-09-01), Wheeler et al.
patent: 3893484 (1975-07-01), Greene
patent: 4128047 (1978-12-01), Caero
patent: 4860792 (1989-08-01), Ichihashi et al.
patent: 5361803 (1994-11-01), Stoll
patent: 5487409 (1996-01-01), Stoll et al.
patent: 33 15 056 (1984-10-01), None
patent: 0 860 612 (1998-08-01), None

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