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US 2015/0267841 A1Published application
Water hammer prevention valve and method
OwnerDale S. Cheney, Steven L. Nicholsinventors
Life of this patent
Estimating the term…
Abstract
A valve for preventing water hammer includes a speed reduction device for reducing a speed at which the valve may be closed. A method of preventing water hammer includes closing a valve at a fire hydrant after extracting water from the fire hydrant, in which the valve comprising a speed reduction device that increases an amount of time needed for closing the valve, and operating the valve to close the valve comprises operating the speed reduction device.
Claims2
A valve for preventing water hammer, said valve comprising:
- a gate valve having a gate that is translated in and out of a channel of the valve by rotation of a valve handle;
- and
- a speed reduction device for reducing a speed at which said valve may be closed, the speed reduction device comprising a gear train with a gear ratio such that a number of rotations of said valve handle results in a lesser number of rotations of a screw that translates said gate with respect to said channel;
- wherein threads on the screw supporting the gate are reversed such that, when the gear train reversed a direction of rotation of the valve handle as applied the screw, a clockwise rotation of the handle will close the gate and a counter-clockwise rotation of the handle will open the gate.
1 more element
A method of preventing water hammer, the method comprising:
- closing a valve at a fire hydrant after extracting water from said fire hydrant, the valve comprising a gate valve having a gate that is translated in and out of a channel of the valve by rotation of a valve handle, and closing the valve comprising rotating the valve handle in a clockwise direction;
- wherein the valve comprising a speed reduction device that increases an amount of time needed for closing said valve, and operating said valve to close said valve comprises operating a speed reduction device such that said increased amount of time needed for closing said valve prevents an occurrence of water hammer associated with said closing of said valve;
- wherein the speed reduction device for reducing a speed at which said valve may be closed comprising a gear train with a gear ratio such that a number of rotations of said valve handle results in a lesser number of rotations of a screw that translates said gate with respect to said channel;
- wherein threads on the screw supporting the gate are reversed such that, when the gear train reverses a direction of rotation of the valve handle as applied to the screw, a clockwise rotation of the handle will close the gate and a counter-clockwise rotation of the handle will open the gate.
1 more element
Dependencies are inferred from the claim text.