Pumps – Expansible chamber type – Having pulsation dampening fluid receiving space
Patent
1993-07-30
1994-06-28
Gluck, Richard E.
Pumps
Expansible chamber type
Having pulsation dampening fluid receiving space
73 4R, 137860, 251121, 251205, 251225, G01L 2700
Patent
active
053241819
ABSTRACT:
A pneumatic calibration system and the pump therefore, the system comprising a first fluid containing chamber for attachment to a device to be tested, a valve coupled to the first chamber to remove the fluid from the first chamber and a pump structure for providing a predetermined pressure to the fluid in the first chamber. The pump comprises a first piston disposed and moveable within first chamber to vary the volume of first chamber, a second piston, a second fluid containing chamber communicating between the first piston and the second piston, the second piston providing a predetermined pressure to the fluid in the second chamber and an expanding sleeve valve communicating between the first chamber and the second chamber to minimize the pressure differential across the first piston. The position of the first piston is adjustable in the first chamber. The second chamber includes a first portion and a second portion with a sleeve valve disposed therebetween. The valve coupled to the first chamber comprises a shaft positionable external of the first chamber and having a slit disposed in the distal end thereof, the slit extending parallel to the axis of the shaft, an "O"-ring disposed around the shaft and providing a seal around the shaft and positioning structure to selectively position the slit relative to the "O"-ring so that at least a portion of the slit extends external of the first chamber to permit fluid to escape from the first chamber at a predetermined rate.
REFERENCES:
patent: 821988 (1906-05-01), Craig
patent: 2980392 (1961-04-01), Greenwood
patent: 3154486 (1964-10-01), Weaver
patent: 3384338 (1968-05-01), Dermody
patent: 3436955 (1969-04-01), Wilcher
patent: 4766765 (1988-08-01), Ezekoya
Cimino Donald F.
McGoldrick Christopher R.
Cantor Jay M.
Gluck Richard E.
Transmation, Inc.
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