Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

2006-01-17

2006-01-17

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S492500, C137S495000, C251S028000, C251S063600, C251S282000

Reexamination Certificate

active

06986362

ABSTRACT:
Disclosed is a pilot operated relief valve, in which a balance system is provided to offset a tank pressure exerted on a piston, so that a setting pressure of a pilot poppet is not changed even when the tank pressure is changed, and thus a function of the relief valve can be stably performed. The pilot operated relief valve is comprised of a sleeve, a main poppet provided to be movable in the sleeve, a seat provided in the sleeve, a housing connected to a rear end of the sleeve, a pilot poppet provided to be movable in the housing, a piston moved by a pilot signal pressure, and the balance system offsetting the tank pressure exerted on the piston.

REFERENCES:
patent: 6644346 (2003-11-01), Conrads et al.
patent: 52070424 (1977-06-01), None
patent: 57-065467 (1982-04-01), None
patent: 05280653 (1993-10-01), None
patent: 11-072172 (1999-03-01), None
patent: 11-132347 (1999-05-01), None
Patent Abstracts of Japan of JP 11-132347 dated May 21, 1999.
Patent Abstracts of Japan of JP 11-072172 dated Mar. 16, 1999.
Patent Abstracts of Japan of JP 57-065467 dated Apr. 21, 1982.

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