Title: AV-1 alarm valve.pdf
Step 1. Check for signs of continued leakage from the alarm line drain. If rust stains and/or water deposits indicate that continued leakage has been taking place, take corrective action according to the procedure described in the sub- section entitled “Leakage from Alarm Line Drain.”Step 2. If there are no signs of contin- ued leakage from the alarm line drain, close the main control valve, slowly remove the plug from the supply pres- sure gauge test valve to relieve the supply pressure, and then slowly open the union in the externally mounted bypass.Step 3. Check for leakage past the Bypass Check Valve. If there is leak- age, debris may have become lodged between its clapper and seat. Drain the system in accordance with the prescribed procedure and then clean or replace the Bypass Check Valve as required.