Soft ventable relief valve

Details Soft ventable relief valve Soft ventable relief valve

2006-02-21

2008-12-23

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S492500

Reexamination Certificate

active

07467642

ABSTRACT:
A pilot operated pressure valve which limits the rate of pressure rise and substantially eliminates excessive system and tank pressure spikes. Because the pilot ball downstream of the damping orifice is held off the pilot seat in the normal starting condition by a pilot return spring, the main piston will open immediately when system pressure overcomes the low bias pressure of the main spring. A pilot pressure bypass port, which selectively deactivates the pilot chamber features, may also be included.

REFERENCES:
patent: 4653527 (1987-03-01), Kosarzecki
patent: 4742846 (1988-05-01), DiBartolo
patent: 4795129 (1989-01-01), Clark
patent: 5050636 (1991-09-01), Sagawa et al.
patent: 5381823 (1995-01-01), DiBartolo
patent: 6039070 (2000-03-01), Zaehe
patent: 6119722 (2000-09-01), Zaehe
patent: 6640830 (2003-11-01), Zahe
patent: 2003/0106588 (2003-06-01), Zahe

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