Electromagnetic directional control valve

Details Electromagnetic directional control valve Electromagnetic directional control valve

1990-06-28

1992-04-07

Michalsky, Gerald A.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

13762565, 2511291, F15B 14044, F16K 3700

Patent

active

051018560

ABSTRACT:
A spool of a valve main body is switched and driven by exciting a solenoid coil by supplying a DC or AC voltage. An intensity of the magnetism generated by the excitation of the solenoid coil is detected by a magnetic sensor. When a predetermined sensor output is obtained, an indicator lamp is lit to indicate that the spool has operated correctly. The intensity of the magnetism due to the DC excitation is detected by magnetoresistive devices. The intensity of magnetism due to the AC excitation is detected by a pickup coil or a current transformer.

REFERENCES:
patent: 3789876 (1974-02-01), Kempton et al.
patent: 4004258 (1977-01-01), Arnold
patent: 4308891 (1982-01-01), Loup
patent: 4418720 (1983-12-01), Day et al.
patent: 4794948 (1989-01-01), Schempp
patent: 4809742 (1989-03-01), Grau
patent: 4825904 (1989-05-01), Grau

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