Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1996-04-04
1997-11-18
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
25112918, 137489, 1374875, 1374925, F16K 3112
Patent
active
056877595
ABSTRACT:
A servovalve includes a casing presenting an inlet and an outlet, and a primary valve supported on the casing and including a valve plug that is movable between a closed position blocking flow through the casing, and a plurality of open positions in which the valve plug presents a restriction of variable size for varying the flow. A diaphragm supports the valve plug and includes a first side proximal to the plug and a second side remote from the plug. A control chamber is provided on the first side of the diaphragm, and is connected to the inlet by a pilot inlet passage and to the outlet by a pilot outlet passage. A pilot valve controls the flow of fluid through the pilot outlet passage, and includes a control plug that is movable between a closed position in which the control plug blocks the pilot outlet passage, and a plurality of open positions in which the control plug presents a restriction of variable size within the pilot outlet passage for varying the flow between the control chamber and the outlet. A solenoid moves the control plug between the closed and open positions, and includes an electromagnetic coil, an axially shiftable core on which the control plug is supposed, and a spring assembly for supposing the core within the coil so that the position of the core relative to the coil is established by the force exerted on the core by the electromagnetic field around the coil acting in opposition to the spring assembly.
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Farid Ramyar
Ferensic Denise L.
The Curators of the University of Missouri
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