Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1991-07-17
1992-05-12
Fox, John C.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
137 74, F16K 1736
Patent
active
051118378
ABSTRACT:
A poppet valve structure has a valve plug biased inwardly to close a vent opening (10). A connector member (40, 58) includes a cage (40) extending inwardly from the valve plug and a separately formed bottom plate (58) secured to the cage (40). The plate (58) defines a radially outwardly opening recess (64) and a first pair of axially spaced apart confronting surfaces. A spring abutment member (66) surrounds the plate (58) and defines a radially inwardly opening recess (74) and a second pair of confronting surfaces. The two pairs of surfaces confront and substantially contact each other. The recesses (64, 74) together define a substantially closed annular chamber. The chamber may be formed by a pair of confronting channels (64, 74) or defined axially between two flanges (61, 67) on the plate (58') and the abutment member (66'), respectively. A ring of fusible material (76) is cast in situ within the chamber to interconnect the plate (58) and the abutment member ( 66). At elevated temperatures, the fusible material (76) melts to allow the plate (58) and abutment member (66) to slide relative to each other and the plug to move outwardly away from the vent opening. The valve may be incorporated into a fuel tank cap.
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Forsythe Alan K.
Morris John M.
Stephens Charles E.
Barnard Delbert J.
Fox John C.
GT Development Corporation
Pauly Joan H.
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