The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1998
Filed:
Jun. 26, 1996
Lester B Engelmann, Woodland, CA (US);
Ames Company, Inc., Woodland, CA (US);
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.