Control valve with two-stage shutoff and peel away opening actio

Details Control valve with two-stage shutoff and peel away opening actio Control valve with two-stage shutoff and peel away opening actio

1996-09-13

1998-05-26

Michalsky, Gerald A.

Fluid handling

Diverse fluid containing pressure systems

Fluid separating traps or vents

137 43, F16K 2404

Patent

active

057552525

ABSTRACT:
An inventive liquid level operated control valve which shuts off refueling with a two-stage closing operation providing an initial soft shutoff and a final shutoff. A first valve element is spring-biased within a first valve cage on the upper end of the float mechanism to seal against a primary vent outlet to provide the initial shutoff. A second valve element contained in a second valve cage within the first valve cage is coaxially arranged with the first valve element and serves to close a secondary vent outlet through the first valve element for the final shutoff. The decorking operation of the valve is improved with a dual peelaway action, in which both the first and second valve cages are configured to circumferentially peel their respective valve elements from their respective sealing positions. Additionally, the resilient seal member for the primary valve element is located on the valve body around the vent outlet to provide a positive seal while reducing the area of the resilient seal across which a tank/canister pressure differential might act to keep the valve closed when liquid levels drop.

REFERENCES:
patent: 4753262 (1988-06-01), Bergsma
patent: 4982757 (1991-01-01), Ohasi et al.
patent: 5044389 (1991-09-01), Gimby
patent: 5439023 (1995-08-01), Horikawa
patent: 5590697 (1997-01-01), Benjey et al.

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