Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
2007-10-09
2007-10-09
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C137S014000, C137S487500, C137S624110
Reexamination Certificate
active
11425028
ABSTRACT:
A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps′ of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps′ capable of bringing the vibration detection signal Pr substantially to zero.
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Waterhammer, “A Complex Phenomenon with a Simple Solution”, online search at Omega.com, Technical Reference Selection Guide.
International Search Report (PCT/JP03/16287), completed Mar. 2, 2004.
Dohi Ryousuke
Ikeda Nobukazu
Nagase Masaaki
Nishimura Ryutaro
Nishino Kouji
Fujikin Incorporated
Griffin & Szipl, P.C.
Krishnamurthy Ramesh
Ohmi Tadahiro
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