What is Test Gag of Pressure Relief Valve

Test Gag of Pressure Relief Valve; 

Test Gag is a bolt used for the spindle block of the pressure relief valve (PRV) to allow the PRV to be closed during the pressure test. The bolt should be tightened when the system has 80% of the pressure used. test (test pressure) to ensure that the PRV is closed at the test Pressure:

Test Gag of Valve.png

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