Differential pressure indicators

Details Differential pressure indicators Differential pressure indicators

1996-01-23

1997-12-02

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Piston

73745, 116267, 340607, H01H 3538

Patent

active

056939264

ABSTRACT:
A double differential pressure indicator has a housing containing two pistons arranged in contiguous bores and biased by a single spring extending between opposed ends of the pistons. The differential pressure is applied across both pistons and as the pressure differential increases to a first predetermined difference one piston moves to operate a first indicator which may, for example, be a reed switch. As the differential pressure further increases, the second piston moves to operate a second indicating device which may be a button. In an alternative arrangement, both indicating devices operate at the same differential pressure.

REFERENCES:
patent: 3140690 (1964-07-01), Siebel
patent: 3495566 (1970-02-01), Pall
patent: 3576959 (1971-05-01), Bogodgoft
patent: 3815542 (1974-06-01), Cooper
patent: 3924086 (1975-12-01), Ochsner
patent: 3980040 (1976-09-01), Read
patent: 4172971 (1979-10-01), Silverwater et al.
patent: 4203384 (1980-05-01), Silverwater
patent: 4646624 (1987-03-01), Stearns
patent: 4651670 (1987-03-01), Silverwater
patent: 4654140 (1987-03-01), Chen
patent: 5331856 (1994-07-01), Cassidy

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