Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1983-12-27
1987-04-21
Rosenthal, Arnold
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
251327, 251330, F16K 4116, F16K 300
Patent
active
046588485
ABSTRACT:
An improved heat responsive backseat for gate valves which includes a rotating valve stem (50) carried by a bonnet assembly (14) for actuation of a gate member (40). A fusible stem ring (126) supports the valve stem at an outer portion thereof (68) within a roller bearing chamber (56) of the bonnet assembly. The valve stem (50) moves axially outward from the valve chamber (20) when the fusible stem ring (126) melts due to an external fire condition to bring a valve stem backseat portion (64) into sealing engagement with a bonnet seat portion (54). The valve stem (50) moves axially outward from the valve chamber (20) independently of roller bearings (74, 76) contained within roller bearing chamber (56) such that the roller bearings (74, 76) remain axially fixed with respect to the bonnet assembly before, during and after the shifting of the valve stem. Therefore, the valve stem may be easily rotated after the fire condition has been extinguished without the occurrence of cocking or wedging between the bearing means and valve stem. Accordingly, a secondary metal-to-metal seal is provided between the valve stem (50) and bonnet assembly (14) such that if the primary packing (104) is destroyed by the fire condition the gate valve will not leak flowline fluid exteriorly of the gate valve.
REFERENCES:
patent: 4245661 (1981-01-01), McGee
patent: 4289157 (1981-09-01), McGee
patent: 4307745 (1981-12-01), McGee
patent: 4510960 (1985-04-01), Jennings et al.
patent: 4568062 (1986-02-01), Regitz et al.
Meyer Danny S.
Shelton William S.
Joy Manufacturing Company
Rosenthal Arnold
Warmbold David A.
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