Devices for the very accurate measurement of fluid pressures

Details Devices for the very accurate measurement of fluid pressures Devices for the very accurate measurement of fluid pressures

1986-04-17

1987-06-02

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Piston

73701, 73708, G01L 716, G01L 910

Patent

active

046693173

ABSTRACT:
A device is provided for the very accurate measurement of fluid pressures, comprising a vertical cylinder (2), a piston (1) adapted for sliding in this cylinder with viscous friction, the pressure to be measured being applied to the upper face (23) of the piston in an upper enclosure (22), means for rotating said piston in said cylinder, a precision electromagnetic dynamometric display balance (B) comprising a piece (3) to which the force to be measured is applied and means for transmitting to the piece of the balance the force applied to the piston by the pressure to be measured, with limitation of the maximum forces, a lower sealed enclosure (22a, 44A-44d), this lower enclosure being able to be evacuated or pressurized to a desired pressure (the atmospheric pressure or that of a fluid), and means for permanently supplying the clearance between the piston (1) and the cylinder (2) with fluid.

REFERENCES:
patent: 4413526 (1983-11-01), Delajoud
patent: 4491016 (1985-01-01), Haefner
patent: 4541285 (1985-09-01), Haefner

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