Signals and indicators – Indicators – Fluid flow
Patent
1981-10-15
1984-05-01
Frankfort, Charles
Signals and indicators
Indicators
Fluid flow
G01L 102
Patent
active
044454570
ABSTRACT:
A differential pressure indicator is disclosed, providing an indication upon detection of a predetermined level of differential pressure in a fluid pressure system. The device includes a piston mounted to a rolling lip diaphragm, with the differential pressure exerted across the piston, which is thereby moved against the resistance of a bias spring from a non-display position to a display position upon development of the predetermined differential pressure. The piston is viewable in the display position through a 360.degree. window formed integrally with the housing or by a separate transparent ring assembled into the housing. Valving may also be controlled by the piston movement, enabling communication of fluid pressure to an outlet port for activation of a fluid pressure operated audible signal or other indicator device.
REFERENCES:
patent: 2954751 (1960-10-01), Barnes
patent: 3358836 (1967-12-01), Schmitt
patent: 3411475 (1968-11-01), Sheff
patent: 3654414 (1972-04-01), Kudlaty
patent: 4366717 (1983-01-01), Foord et al.
Benefiel John R.
Frankfort Charles
Schuster David R.
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