Apparatus for protecting differential pressure measurement appar

Details Apparatus for protecting differential pressure measurement appar Apparatus for protecting differential pressure measurement appar

1982-01-26

1984-07-24

Swisher, S. Clement

Measuring and testing

Fluid pressure gauge

With protective separator

73716, 73736, G01L 1906

Patent

active

044611803

ABSTRACT:
An apparatus for protecting a pressure differential sensor from exceeding a maximum allowable pressure differential. The apparatus has a housing which has a low-pressure chamber and a high-pressure chamber. A pressure-sensitive member separates the high-pressure chamber and the low-pressure chamber from one another. A blocking member is provided for blocking the entrance of fluid into the high-pressure chamber in response to the pressure-sensitive member sensing an initial differential pressure between the high-pressure chamber and the low-pressure chamber which exceeds the maximum allowable differential pressure. There may also be provided equilibration structure for creating a hysteresis loop as to the magnitude of the pressure differential between the high-pressure chamber and the low-pressure chamber. The equilibration structure allows communication between the high-pressure chamber and the low-pressure chamber in response to the pressure-sensitive member sensing a further increase in the pressure differential between the high-pressure chamber and the low-pressure chamber after the blocking member has blocked the high-pressure chamber inlet orifice, and shuts off this communication when the pressure differential between the high-pressure and low-pressure chamber drops to a level slightly less than the maximum allowable differential pressure.

REFERENCES:
patent: 2558534 (1951-06-01), Bentley
patent: 2627183 (1953-02-01), Greenwood, Jr. et al.
patent: 2981110 (1961-04-01), Fenn et al.
patent: 3290945 (1966-12-01), Li et al.
patent: 3712143 (1973-01-01), Weaver et al.
patent: 3718048 (1973-02-01), Nolte
patent: 3756085 (1973-09-01), Hunter
patent: 4135407 (1979-01-01), Ezekiel

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