Differential pressure indicator

Details Differential pressure indicator Differential pressure indicator

1994-08-01

1995-08-01

Cuchlinski, Jr., William A.

Signals and indicators

Indicators

Fluid flow

116267, 116272, G01L 1912

Patent

active

054372410

ABSTRACT:
A differential pressure indicator includes a housing having first and second pressure ports for fluid and a bore communicating with the pressure ports. A piston is movable in the bore between an actuated and an unactuated position in response to a pressure differential between the first and second pressure ports. A sensor senses movement of the piston between the actuated and the unactuated positions. A fluid control mechanism varies the effective surface area of the piston communicating with the first pressure port when the piston is in the unactuated position in accordance with variations in temperature of fluid at one of the pressure ports. The indicator is thereby prevented from actuating at low temperatures at which the fluid has a high viscosity.

REFERENCES:
patent: 3626474 (1971-12-01), Hammer
patent: 3785332 (1974-01-01), Silverwater
patent: 4172971 (1979-10-01), Silverwater et al.
patent: 4205702 (1980-06-01), Silverwater
patent: 4205703 (1980-06-01), Silverwater
patent: 4651670 (1987-03-01), Silverwater
patent: 5188728 (1993-02-01), Traonvoez et al.

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