Title: AV-1 alarm valve.pdf
Step 4. Re-assemble the externally mounted bypass, replace the plug into the Gauge Test Valve, and return the fire protection system to operation in accordance with the steps described in the Operation section.Step 5. If there are no signs of leak- age past either the Alarm Check Valve Clapper per Step 1 or the Bypass Check Valve per Step 2, inspect the sprinkler system for leakage.Excess Pressure Due to Thermal Expansion Wet pipe sprinkler systems subject to ambient temperatures in excess of 100°F (38°C) can experience significant increases in system pressure due to the thermal expansion of the water. In particular, a gridded wet-pipe system with a relatively small air pocket and no relief valve can be subjected to an increase of more than 100 psi (6,9 bar), due to an increase in ambient tempera- ture of approximately 50°F (28°C).