Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1983-09-02
1984-10-02
Schwadron, Martin P.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
137315, 251214, 277 27, F16K 1738
Patent
active
044742037
ABSTRACT:
A valve having a back-sealing capability provided by a pressure energizable sealing assembly which becomes operative independently of valve stem movement and valve element position for sealing between the valve casing (10, 22) and the valve stem (21) in the event of loss of sealing by the valve stem packing (33). A sealing ring (45) of the sealing assembly is installed with limited axial movement in an enlargement (20a) of the valve stem bore located intermediate the valve stem packing (33) and the valve chamber (11). The sealing ring (45) is provided with inner peripheral sealing surfaces (54) and an outer peripheral sealing surface (51) conforming in configuration to that of a corresponding sealing surface (42) provided in the stem bore enlargement. Yieldable spacer means (47) are provided for normally maintaining the sealing ring with the outer peripheral sealing surface (45) of the sealing ring in close proximity to the sealing surface (42) of the valve stem bore enlargement whereby the sealing assembly is responsive to a pressure differential induced across the sealing ring by a stem packing leak to establish a pressure energized metal-to-metal seal between the valve casing and the valve stem. In a modified form, the yieldable spacer means includes a eutectic member (62) which melts at a predetermined temperature whereby the magnitude of the packing leak at which the sealing assembly becomes operative is minimized.
REFERENCES:
patent: 2647721 (1953-08-01), Volpin
patent: 3064674 (1962-11-01), Carfagna
patent: 4082105 (1978-04-01), Allen
patent: 4149558 (1979-04-01), McGee et al.
patent: 4245661 (1981-01-01), McGee
patent: 4271857 (1981-06-01), Rowe
patent: 4379557 (1983-04-01), Saka
patent: 4421134 (1983-12-01), Bruton et al.
ACF Industries Incorporated
Marnock Marvin J.
Schwadron Martin P.
Starsiak Jr. John S.
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