Programmed valve system used for positioning control

Details Programmed valve system used for positioning control Programmed valve system used for positioning control

F - Mech Eng,Light,Heat,Weapons

15

B

137/113

F15B 13/042 (2006.01) A01D 41/14 (2006.01) F15B 13/02 (2006.01)

Patent

CA 1135151

Abstract of the Disclosure A programmed valve system for positioning control having a first two stage valve assembly operable for raising a load and a second two stage valve assembly for lowering the load. Each of the second stages has a poppet with a parabolic contour which is dimensioned with orifice parameters to provide substantially linear flow rate change for mini- mized shock when one of the second stage poppets closes and the other opens. In the raise assembly, the pilot stage outlet orifice has a cross-sectional area substantially larger than that of the inlet orifice so that the second stage poppet opens much more rapidly than the closing thereof thereby to minimize overshoot when the pilot stage is actuated to the open position.

312758

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