Pilot-operated proportional control valve

Details Pilot-operated proportional control valve Pilot-operated proportional control valve

1995-03-29

1996-07-23

Lee, Kevin

Fluid handling

Processes

251 3004, 25112908, F16K 3102

Patent

active

055380263

ABSTRACT:
A pilot-operated proportional control solenoid valve includes a housing enclosing a main valve member and a pilot valve member which provide flow control from a side inlet to a nose outlet. The main valve member includes a first radial passage and a first longitudinal passage to a pilot valve chamber. A second radial passage and a second longitudinal passage interconnect the first longitudinal passage with the housing outlet. The pilot valve member comprises a hollow cylinder disposed within the first longitudinal passage in the main valve member. The pilot valve member includes a radial inlet at one end and a radial outlet at its outer end for fluid to flow from the housing inlet to the pilot valve chamber and bias the main valve member against a valve seat when the solenoid is de-energized. The pilot valve member normally abuts the main valve member to prevent fluid from flowing through an axial opening at the one end of the pilot valve member. When the solenoid is energized, the pilot valve member moves away from the main valve member and fluid flows through the axial opening at the one end. Another radial outlet along the length of the pilot valve member is also aligned with the second radial passage in the main valve member for fluid to flow to the housing outlet. When the solenoid is further energized, the main valve member moves away from the valve seat such that fluid flows directly from the housing inlet to the housing outlet.

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