Valve unit

Details Valve unit Valve unit

1986-12-31

1988-11-15

Chambers, A. Michael

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

251368, 29620, 427124, 4271263, 123305, F16K 3700

Patent

active

047841788

ABSTRACT:
In a valve unit having an ON-OFF switch constituted by a valve, the associated valve seat and an insulation layer, the layer is made of a compound consisting of a specific metal and a specific reaction gas and the layer is coated on the outer surface of the valve in such a way that its electrical resistance increases progressively from the inner surface closest to the valve to the outer surface destined to make contact with a guide member of the valve.

REFERENCES:
patent: 3996551 (1976-12-01), Croson
patent: 4091138 (1978-05-01), Takagi et al.
patent: 4111178 (1978-09-01), Casey
patent: 4327122 (1982-04-01), Chakupurakal
patent: 4374162 (1983-02-01), Takagi
patent: 4414274 (1983-11-01), Hieber
patent: 4513518 (1979-05-01), Holmes et al.

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