Fire resistant pressure switch

Details Fire resistant pressure switch Fire resistant pressure switch

1981-10-13

1984-03-20

Tolin, G. P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 82C, 2003021, H01H 3540

Patent

active

044383053

ABSTRACT:
A pressure switch device having a fire resistant welded assembly of corrosion resistant steel components exposed to the fluid medium which is being monitored. A flexible diaphragm constructed of corrosion resistant steel film is overlaid by a backing disc and backing ring both formed of corrosion resistant steel. Inside the backing ring is an elastomer disc which receives a stainless steel piston that moves up and down in response to changes in the fluid pressure applied to the diaphragm through a pressure port. The piston has a shaft which actuates an electrical switch in response to changes in the pressure of the fluid medium. The periphery of the diaphragm is secured by a pressure tight weld to the housing, the upper corrosion resistant steel disc and the backing ring to provide a fire resistant assembly which confines the pressure medium in the event of a fire.

REFERENCES:
patent: 2117213 (1938-05-01), Rodanet
patent: 3444341 (1969-05-01), Mighton
patent: 3584168 (1971-06-01), Halpert
patent: 3937912 (1976-02-01), Martin

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