Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1994-08-08
1995-10-24
Walton, George A.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
25131501, 277112, 403 41, 411 7, 411120, F15K 4104, F16B 3928, F16B 39282
Patent
active
054603510
ABSTRACT:
The invention provides a valve stem locking assembly for releasably locking a threaded fastener relative to a valve stem of a quarter-turn valve such as a ball valve. The assembly includes a handle defining an opening shaped to engage a corresponding shape of the valve stem to preclude relative rotation therebetween while allowing relative motion therebetween along the longitudinal axis of the valve stem. A standard nut engages the handle and is threaded onto the valve stem for movement relative to the valve stem along the axis. A spring biases the nut and the handle into relative rotation resisting engagement with each other. A camming mechanism, defined by the handle and the chamfer of the nut, is biased by the spring to prevent relative rotation therebetween until a desired torque about the axis is applied to the nut relative to the handle. When the nut is turned, the camming mechanism overcomes the rotation resisting engagement and pushes the handle along the valve stem axis against the bias of the spring. The nut then becomes free to rotate relative to the handle until the nut and the handle reengage.
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Parker & Harper Companies, Inc.
Walton George A.
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