Lubrication system for valve seat of a gate valve
First Claim
1. In a gate valve including a valve body having a valve chamber therein and pair of flow passages extending therethrough at opposite sides of the flow chamber, a gate member reciprocally movable within said valve chamber between an open and a closed position, said gate member having a flow port therethrough which is selectively aligned with the flow passages to open said gate valve, and seal means for preventing flow of fluid along the surface of the gate member, said seal means including a primary seal seat member and a secondary seal seat member slidably mounted on said primary seal seat member in proximity to the gate member within a recess formed in said flow passages, the improvement comprising:
- a lubrication system communicating between the exterior of the valve body and said seal means to provide a continuous supply of lubricant to said seal means, said secondary seal seat member having a lubricant passageway to which lubricant is supplied directing lubricant between said primary and secondary seal seat members, said lubricant selectively supplied under a predetermined pressure threshold to test the integrity of the primary seal seat member and the secondary seal seat member of the seal means.
3 Assignments
0 Petitions
Accused Products
Abstract
A lubrication system for the block and bleed valve seat of a gate valve. Lubrication is provided to the seat through tubing which communicates with the exterior of the gate valve to supply the lubricant and the interior channels of the valve seat. Seals in the valve seat maintain the lubricant within the interior channels of the seat. The lubrication system allows the user to test each seat for integrity without exposing the entire valve to atmosphere by increasing lubricant pressure through the valve seat.
60 Citations
11 Claims
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1. In a gate valve including a valve body having a valve chamber therein and pair of flow passages extending therethrough at opposite sides of the flow chamber, a gate member reciprocally movable within said valve chamber between an open and a closed position, said gate member having a flow port therethrough which is selectively aligned with the flow passages to open said gate valve, and seal means for preventing flow of fluid along the surface of the gate member, said seal means including a primary seal seat member and a secondary seal seat member slidably mounted on said primary seal seat member in proximity to the gate member within a recess formed in said flow passages, the improvement comprising:
a lubrication system communicating between the exterior of the valve body and said seal means to provide a continuous supply of lubricant to said seal means, said secondary seal seat member having a lubricant passageway to which lubricant is supplied directing lubricant between said primary and secondary seal seat members, said lubricant selectively supplied under a predetermined pressure threshold to test the integrity of the primary seal seat member and the secondary seal seat member of the seal means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a gate valve including a valve body having a valve chamber therein and a pair of flow passages extending therethrough at opposite sides of the flow chamber, a gate member reciprocally movable within said valve chamber between an open and a closed position, said gate member having a flow port therethrough which is selectively aligned with the flow passages to open said gate valve, and seal means for preventing flow of fluid along the surface of the gate member, said seal means including a primary seal seat member and a secondary seat member slidably mounted on said primary seal seat member, said primary and secondary seal seat members independently biased against the gate member, said seal means slidably mounted within an annular recess of the inner end of at least one flow passage adjacent the gate member, the improvement comprising:
a lubrication system communicating between the exterior of the valve body and said seal means to provide a continuous supply of lubricant to said seal means, said lubrication system directing lubricant to a gap between said primary and secondary seal seat members, said lubricant selectively supplied at a predetermined pressure threshold to test the integrity of the primary seal seat member and the secondary seal seat member of the seal means. - View Dependent Claims (10, 11)
Specification