Electromagnetic proportional pressure control valve

Details Electromagnetic proportional pressure control valve Electromagnetic proportional pressure control valve

1996-06-24

1998-06-23

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 3004, 251 33, F16K 3112

Patent

active

057693862

ABSTRACT:
An electromagnetic proportional pressure control valve includes a housing having at least one fluid inlet port and fluid outlet port and a passage for communicating between the ports. A spool is slidably accommodated in the housing for opening and closing the passage between both the ports. A plunger device is housed in the housing to define a pressure chamber, and includes a pilot valve. A return passage is arranged through the plunger device between the pressure chamber and the outlet port. The opening and closing of the return passage is controlled by the pilot valve. A restricting device restricts a fluid communicating between the inlet port and the pressure chamber. An electromagnetic device has an electromagnetic coil and a core of magnetic material to generate electromagnetic force for allowing the pilot valve to move so as to control the opening and closing of the return passage. Lastly, the pressure control includes a device for preventing the pilot valve from moving as a result of fluctuations in the fluid pressure in the pressure chamber regardless of the electromagnetic force generated by the electromagnetic device.

REFERENCES:
patent: 4679765 (1987-07-01), Kramer et al.
patent: 5564673 (1996-10-01), Pieren

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