Measuring and testing – Blower – pump – and hydraulic equipment
Patent
1996-06-26
1998-02-03
Cuchlinski, Jr., William A.
Measuring and testing
Blower, pump, and hydraulic equipment
G01M 1900
Patent
active
057132402
ABSTRACT:
An apparatus and method for automatic and remote testing of check valves and backflow preventers. Pressure sensors have ports in communication with chambers upstream and downstream from a check valve to be tested. The sensors may be pressure transducers or pressure switches, of single stage, differential, or "dead band" design. Zero or substantially zero liquid flow through the check valve is confirmed either by an existing water flow meter or an auxiliary water flow switch. Upstream and downstream pressures are sampled, and the differential pressure therebetween is compared with predetermined standards and a pass/fail report is rendered. The report may be stored and communicated by hard wire or wireless means, to a remote facility where like information is received from a plurality of check valve sites. One of the three disclosed embodiments teaches an apparatus and method for testing a backflow preventer including a pressure relief valve operating on the reduced pressure principle.
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Ames Company, Inc.
Cuchlinski Jr. William A.
Worth Willie Morris
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