Combined relief valve and check valve

Details Combined relief valve and check valve Combined relief valve and check valve

2007-06-27

2010-10-05

Fox, John (Department: 3753)

Fluid handling

Systems

With flow control means for branched passages

C137S539000, C137S614200

Reexamination Certificate

active

07806142

ABSTRACT:
A combination check valve and relief valve has a valve body with an inlet, an outlet, and a valve chamber operatively interposed between the inlet and outlet. A check valve may be integrated with the relief valve and therefore simplify a hydraulic system. The valve includes a relief valve member which is within the valve chamber. The valve also includes a resilient member with a first end and a second end. The first end of the resilient member operatively engages the relief valve member. The valve includes a setting member pressure-fit within the valve chamber to operatively engage the second end of the resilient member. The resilient member is resiliently biased between the setting member and the relief valve member to bias the relief valve member against a relief valve seat, whereby, when pressurized fluid communicates with the inlet, the resilient member is compressed, and the relief valve member disengages its seat to enable the fluid to pass through to the outlet.

REFERENCES:
patent: 2970467 (1961-02-01), Pettibone
patent: 3107417 (1963-10-01), Jaquish, Jr. et al.
patent: 3974861 (1976-08-01), Goto et al.
patent: 4231443 (1980-11-01), van der Lely
patent: 4249499 (1981-02-01), Perr
patent: 4616677 (1986-10-01), Krechel et al.
patent: 4836245 (1989-06-01), Takahashi et al.
patent: 4873817 (1989-10-01), Harms
patent: 6283138 (2001-09-01), Friend et al.
patent: 2012025 (1978-12-01), None

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