Patent ID: 9091360
Filing Date: 2015-07-28
Classification: E03C,F16K,Y10T

Abstract:
1. A method for testing the operability of a backflow preventer using a single inlet pressure limiting valve having a first pressure gauge for measuring an activation pressure of a check valve and a second pressure gauge for measuring a line pressure coupled to the backflow preventer, comprising the steps of: removing air out from within the backflow preventer and a multi valve tee coupled thereto by at least establishing a fluid flow out the multi valve tee; coupling the multi valve tee to the inlet of the pressure limiting valve while establishing the fluid flow out from the multi valve tee; bleeding the pressure limiting valve of residual air while the first and second pressure gauges are in fluid communication with a common drain; separating the first and second pressure gauges from the common drain, thereby activating the pressure limiting valve; closing the backflow preventer to the line pressure; and reestablishing fluid communication of the first and second pressure gauges with the common drain to release pressurized fluid from an upstream side of the check valve, wherein the check valve engages at the activation pressure identifiable via readings on the first pressure gauge.