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1. (WO2003060459) TESTING VALVE ASSEMBLIES

Pub. No.:    WO/2003/060459    International Application No.:    PCT/US2003/000907
Publication Date: Jul 24, 2003 International Filing Date: Jan 13, 2003
IPC: G01F 1/26
G01L 15/00
G01M 19/00
G06F 19/00
Applicants: WATTS INVESTMENT COMPANY
ENGLEMANN, Lester
Inventors: ENGLEMANN, Lester
Title: TESTING VALVE ASSEMBLIES
Abstract:
A method of determining flow through a valve includes determining a first differential pressure across the valve (410). The valve is bypassed (420) and a second differential pressure is determining across the valve (440). A flow decision is determined for the valve based on comparison of the first and second differential pressures (450) (fig. 4). A method of testing a relief valve in a reduced pressure backflow preventer assembly includes determining a first differential pressure across an upstream check valve during a no flow condition (1020). The upstream check valve is bypassed (1030) for the purpose of opening a relief valve, and a zone vent is opened (1050) (Fig. 10).