Differential pressure operated switch

Details Differential pressure operated switch Differential pressure operated switch

1976-01-30

1978-07-18

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83Y, 200 83C, 200 81R, 92103SD, H01H 3532

Patent

active

041017471

ABSTRACT:
A pressure responsive control device including a housing, a control switch unit and switch operating actuator, and a controller unit is disclosed for controlling operation of a refrigeration defrosting device. The actuator includes a bladder formed of thin film material which changes volume when a differential fluid pressure exists across the bladder. The bladder and switch unit are such that bladder volume changes are accompanied by minimal losses thus enabling the controller unit to be enabled in response to extremely slight differential pressures.

REFERENCES:
patent: 2092955 (1937-09-01), Chamberlain
patent: 2109145 (1938-02-01), Farmer
patent: 2962565 (1960-11-01), Schlicksupp
patent: 3330925 (1967-07-01), Andrew et al.
patent: 3472037 (1969-10-01), Bucalo
patent: 3827828 (1974-08-01), Edwards
patent: 3874052 (1975-04-01), Schantz

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