Dry pipe valves are usually set at ________ PSI above the normal trip level.

Dry pipe valves typically require a pressure setting that is 15 to 20 PSI above the normal trip level to ensure proper operation. This extra pressure is crucial for maintaining the integrity of the system and preventing premature tripping. The dry pipe valve must hold the air pressure in the system until the activation of the system due to heat from a fire, which allows water to flow into the pipes and extinguish the flames.

Setting the valve at this recommended PSI range provides a buffer that helps account for any minor fluctuations in pressure that may occur due to changes in temperature or minor leaks within the system. By maintaining the pressure within this optimal range, the system can operate effectively and reliably, ensuring that water is delivered to the appropriate areas when needed. Proper calibration of dry pipe valves in accordance with these guidelines is essential for the overall safety and effectiveness of the fire suppression system.