Reset relief valve

Details Reset relief valve Reset relief valve

2006-10-10

2006-10-10

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Fluid opened valve requiring reset

C137S514500, C251S054000

Reexamination Certificate

active

07117885

ABSTRACT:
A reset relief valve with a body having an inlet port, an outlet port, and an interior wall partially defining an enclosed chamber, a piston disposed in the body and moveable between a first position at which the piston is disposed in fluid flow-blocking relationship between the inlet port and the outlet port of the body and a second position at which the piston is removed from that position, a piston having a head with opposed end surfaces one of which defines a portion of the enclosed chamber and at least one fluid flow passageway extending through the head and providing fluid communication between the enclosed chamber in the body, and a second chamber above a moveable disc in the piston. A preferred embodiment includes the crank assembly with cross bar support and a T-bar to prevent downward movement of the disc.

REFERENCES:
patent: 2552479 (1951-05-01), Copping
patent: 2973776 (1961-03-01), Allen
patent: 2973777 (1961-03-01), Troxell, Jr.
patent: 2984254 (1961-05-01), Allen
patent: 3315701 (1967-04-01), Stilwell
patent: 3698424 (1972-10-01), Wiegand
patent: 3730215 (1973-05-01), Conery et al.
patent: 3732889 (1973-05-01), Conery et al.
patent: 4469125 (1984-09-01), Keeney
patent: 5351714 (1994-10-01), Barnowski
patent: 5715861 (1998-02-01), Williams

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