Check valve tester

Abstract

The present invention comprises a very simple apparatus for low pressure testing of equipment used in the water industry such a backflow preventing assemblies, and in particular double check valve backflow assemblies used in the landscape irrigation industry. Testing method is simple. Connect the swivel nut located at the bottom of apparatus to the test cock of a check valve on the normal upstream side of check valve to be tested, manipulate the insolation valves and test cocks of the backflow preventing assembly using conventional procedures and fill the site glass of the apparatus to the level identified on the sight glass with a black line indicating “1.5 psi—Start Test” line. Open test cocks of the check valve test so that pressure is applied to upstream side of the check valve and test cock on the downstream of the check is open to atmospheric pressure. Observe water level in the apparatus sight glass and if water level remains above the red line located on the sight glass indicating “1.0 psi-Fail Line” the check valve passes the test and is performing satisfactorily. Similarly, if water level in sight glass falls below the red indicating line, the check valve fails. The invention is a very simples Pass/Fail test that is accurate, quick, economical, and easy for the licensed tester to perform. It can also be used by plumbers, landscape irrigators and water consumers having an irrigation system for a quick test of their own backflow preventing assembly.

Dependencies are inferred from the claim text.