Gate valve having a secondary seal

Details Gate valve having a secondary seal Gate valve having a secondary seal

F - Mech Eng,Light,Heat,Weapons

16

K

251/73

F16K 25/00 (2006.01) F16K 3/20 (2006.01) F16K 5/20 (2006.01)

Patent

CA 1260908

ABSTRACT OF THE DISCLOSURE A gate valve [10] is disclosed having a secondary seal, wherein the gate [15] forms a metal to metal seal with the seat [29, 128] and wherein a resilient seal [36a] is moved toward the gate [15] in a closed position to form a secondary fluid-tight seal with the gate [15]. A device [31, 34] for deenergizing the secondary seal is provided in order to prevent wear of the secondary seal upon opening of the gate and also to reduce the gate [15] drag caused by the energized secondary seal. Also disclosed is a pressure relief mechanism [40, 141] for the secondary seal adapted to prevent damage to the seal and a mechanism for evenly applying opposing secondary seals.

467615

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