Control valve assembly including valve position sensor

Details Control valve assembly including valve position sensor Control valve assembly including valve position sensor

1988-04-18

1989-03-07

Rivell, John

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

25112911, 25112915, 34087031, 324208, F16K 3700

Patent

active

048097420

ABSTRACT:
An electromechanical valve assembly incorporates an electromechanical actuator, such as a limited angle torque motor or solenoid, to open or close the valve in response to a direct current or low frequency electrical signal. A valve position sensor detects the valve position in response to a second, relatively high frequency electrical signal. The actuator and sensor are electrically connected in parallel so that the valve may be actuated and the valve position may be determined through a single pair of electrical leads. The position sensor preferably includes an electrical coil having a reactance that varies with incident magnetic flux, the magnitude of which depends on valve position.

REFERENCES:
patent: 4013911 (1977-03-01), Fujiwara et al.
patent: 4359685 (1982-11-01), Eguchi et al.
patent: 4385297 (1983-05-01), Schmitt et al.
patent: 4392375 (1983-07-01), Eguchi et al.
patent: 4395711 (1983-07-01), Ward
patent: 4673876 (1987-06-01), Paulsen
patent: 4678992 (1987-07-01), Hametta
patent: 4690168 (1987-09-01), Kihm

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