Title: AV-1 alarm valve.pdf
Step 4. Wait until the Supply Pressure Gauge reads zero pressure and the sound of draining water has stopped before performing any maintenance work on the fire protection system.Leakage from Alarm Line Drain Follow the steps indicated below until water ceases to flow from the alarm line drain. After each step check if leak- age has stopped.Step 1. Open the Main Drain Valve. Let the water flow for about 5 seconds and then close the Main Drain Valve. This should flush any loose debris that may have become trapped between the Clapper Facing and the Seat Ring or in the seating area of the Drain Valve.Step 2. Repeat Step 1 if the rate of continued flow out of the drain was noticeably reduced.Step 3. Open the Alarm Test Valve and allow water to flow for about 5 seconds before re-closing the valve. This should flush any loose debris that may have become trapped in the seating area of the Alarm Test Valve.Step 4. Repeat Step 3 if the rate of continued flow out of the drain was noticeably reduced.