Cartridge check valve

Details Cartridge check valve Cartridge check valve

1997-03-13

1999-05-25

Chambers, A. Michael

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 3002, F16K 3102

Patent

active

059063521

ABSTRACT:
A two port cartridge valve comprises a valve sleeve with a two-step guide hole, a valve piston, which forms a closing element for a valve seat, and a piston shoulder, which divides the second step of the guide hole axially into an end-side first control chamber and an annular second control chamber. An auxiliary piston is fitted in an inner guide hole of the piston shoulder. The cross-section A.sub.s of the inner guide hole is the same size as or larger than the cross-section A.sub.c of the first step sealed by the valve piston. The piston shoulder forms an annular pressure area A.sub.X in the first control chamber. A connecting hole connects the inner guide hole to an orifice in the end face of the valve piston. The valve is used to achieve by means of the pressure to be shut off a hermetic shut-off function. It can be hydraulically locked and unlocked by a pilot valve.

REFERENCES:
patent: 4073464 (1978-02-01), Hansen et al.
patent: 4245162 (1981-01-01), Grenier
patent: 4673162 (1987-06-01), Lachmann
patent: 5048790 (1991-09-01), Wells

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