Test apparatus employing pneumatic bridge for testing pneumatic

Details Test apparatus employing pneumatic bridge for testing pneumatic Test apparatus employing pneumatic bridge for testing pneumatic

1992-12-18

1994-09-20

Williams, Hezron E.

Measuring and testing

With fluid pressure

Dimension, shape, or size

73 375, 116273, 222 71, G01F 136, G01B 1300

Patent

active

053478479

ABSTRACT:
In an apparatus for testing pneumatic flow resistance of a test component, such as an air filter useful in a system for admixing parenteral solutions, a pneumatic bridge has two branches connected, via a filter, a flow restrictor, and a flowmeter, to a source of gas under regulated pressure. Each branch comprises two arms with a centerpoint. The bridge has a pressure transducer connected between the centerpoints and arranged to detect pressure imbalances in the bridge. Each arm comprises a flow restrictor, namely a needle valve, which is calibrated via a vernier head. The valves are adjustable to balance the bridge. In one arm, in which the needle valve can be fully opened, the test component is connectible to constitute a flow restrictor. The transducer produces an output displayed via a digital voltmeter, which may be calibrated.

REFERENCES:
patent: 2266566 (1941-12-01), Poole
patent: 3082619 (1963-03-01), Nerheim et al.
patent: 3091113 (1963-05-01), Nerheim
patent: 3117439 (1964-01-01), Nerheim
patent: 4550592 (1985-11-01), Dechape

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