Water hammerless valve
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United States of America Patent
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-
Jul 3, 2012
Grant Date -
Mar 12, 2009
app pub date -
Jun 18, 2008
filing date -
Dec 21, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A water hammerless valve includes a pneumatically-operated valve having a valve disc for opening and closing a fluid channel by moving upward and downward through a pneumatic actuator operation, and a limiting mechanism for interfering with upward movement of the valve disc when the water hammer occurs. The limiting mechanism includes a stepping motor including a rotation shaft fixed on the upper actuator; a vertical movement component connected to the rotation shaft for moving upward and downward via rotation of the rotation shaft; a lower detecting component for detecting the fact that the vertical movement component contacts the upper end of a stem when the lower detecting component moves downward; and a control device for rotating the stepping motor, for controlling the air supply, and for transmitting a stop signal to the stepping motor when the lower end of the lower detecting component detects the fact.
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