Lock device and lock method for knife gate valves
AssigneeGeneral Signal Corporation
InventorsCraig A. Sowada, Richard R. Ruegemer
Life of this patent
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Abstract
The present invention provides a device and method for locking a knife gate valve in a position, such as an open and/or closed position. The locking device has a pair of first posts disposed substantially parallel to the shaft. A swivel lock member is mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife. The swivel lock member is selectively rotatable between an unlocked position at which the swivel lock member does not engage the first engageable portions and a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft.
Claims20
A locking device for a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions, the locking device comprising:
- a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion;
- and
- a swivel lock member mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife, said swivel lock member selectively rotatable between (1) an unlocked position at which said swivel lock member does not engage said first engageable portions and (2) a locked position at which said swivel lock member engages both of said first engageable portions to prevent said swivel lock member from movement in at least one of the back and forth directions along the axis of said shaft, thereby preventing said shaft and said knife from reciprocating movement in at least one of the back and forth directions when said swivel lock member is in the locked position and engaging said first engageable portions.
A method for locking a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions and has a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion comprising the steps of:
- positioning the knife in a desired position;
- and
- rotating a swivel lock member mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife into a locked position at which the swivel lock member engages both of the first engageable portions to prevent the swivel lock member from movement in at least one of the back and forth directions along the axis of the shaft, thereby preventing the shaft and the knife from reciprocating movement in at least one of the back and forth directions when the swivel lock member is in the locked position and engaging the first engageable portions.
A locking device for a knife gate valve having a housing and a reciprocating shaft that reciprocates a knife in back and forth directions, the locking device comprising:
- a pair of first posts disposed substantially parallel to the shaft, each first post having one end mounted to the housing, and each first post having a first engageable portion;
- and
- rotating locking means mounted to rotate substantially about the axis of the shaft and to reciprocate together with the shaft and the knife, said rotating locking means selectively rotatable between (1) an unlocked position at which said lock means does not engage said first engageable portions and (2) a locked position at which said lock means engages both of said first engageable portions to prevent said swivel lock member from movement in at least one of the back and forth directions along the axis of said shaft, thereby preventing said shaft and said knife from reciprocating movement in at least one of the back and forth directions when said locking means is in the locked position and engaging said first engageable portions.
Dependencies are inferred from the claim text.