LOCK DEVICE AND LOCK METHOD FOR KNIFE GATE VALVES
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United States of America Patent
Stats
-
Jun 4, 2002
Grant Date -
Jul 4, 2002
app pub date -
Dec 29, 2000
filing date -
Dec 29, 2000
priority date (Note) -
Granted
status (Latency Note)
Importance
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.
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