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1. (WO2013154873) PRESSURE LIMITING VALVE AND ALTERNATIVE METHOD FOR TESTING A BACKFLOW PREVENTER USING THE SAME

Pub. No.:    WO/2013/154873    International Application No.:    PCT/US2013/035016
Publication Date: Fri Oct 18 01:59:59 CEST 2013 International Filing Date: Wed Apr 03 01:59:59 CEST 2013
IPC: E03C 1/10
Applicants: FRAHM, Lawrence, L.
Inventors: FRAHM, Lawrence, L.
Title: PRESSURE LIMITING VALVE AND ALTERNATIVE METHOD FOR TESTING A BACKFLOW PREVENTER USING THE SAME
Abstract:
The pressure limiting valve has a low pressure gauge configured to measure the operability of a backflow prevention device having a line pressure relatively higher than the maximum PSI rating of the low pressure gauge. The valve body has an inlet statically coupled to a pressurized fluid source and an outlet coupled to the low pressure gauge. Upper and lower chambers fluidly coupled via a conduit are formed from an interior portion of the valve body and generally separated by a flexible diaphragm. A spring actuable via movement of the flexible diaphragm in response to pressure changes in the valve body biases a closure seat in an open position relative to the outlet when the valve body is not under pressure, and compresses under pressure to permit the closure seat to seal the outlet when pressure in the valve body reaches a maximum PSI rating of the low pressure gauge.