Pneumatic deadweight tester incorporating dampening means

Details Pneumatic deadweight tester incorporating dampening means Pneumatic deadweight tester incorporating dampening means

1984-09-17

1986-06-17

Levy, Stewart J.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

138 43, 73707, G01L 2700

Patent

active

045948771

ABSTRACT:
A weight carrier rests on a floating ceramic ball supported within a nozzle by flow-regulated air. The air flows in an inlet path within the nozzle to support the ball and then exits through an outlet path downstream of the ball. A pressure regulator maintain a selected pressure in correspondence with a given weight on the ball. Dampening is provided in the nozzle itself rather than in a canister external thereto. Helical input and output paths wind around the axis of the nozzle to and from the ball. The cross section of the exit path increases with distance from the ball. The path may comprise an thread of increasing depth in an adjustment screw received in a cylindrical bore along the axis of the nozzle.

REFERENCES:
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patent: 3472059 (1969-10-01), Pruett et al.
patent: 3748891 (1973-07-01), Music
patent: 4413524 (1983-11-01), Kosh
"Pneumatic Tester; Type Pk; Portable--Self-Regulating--Dead Weight--Precision Pressure Source"; Bulletin 466PK; Publication by Mansfield & Green a Division of Ametek, Inc.; 2 pages; by Oct. 1966.

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