What is the maximum psi that the differential dry pipe valve can hold back on the inlet or supply side of an automatic dry sprinkler system?

The maximum psi that a differential dry pipe valve can hold back on the inlet or supply side of an automatic dry sprinkler system is 100 psi. This standard ensures that the valve can effectively operate under typical pressures found in fire protection systems while maintaining a reliable separation between the supply and dry system.

Differential dry pipe valves are specifically designed to maintain sufficient pressure differentials to prevent premature discharge of the sprinkler system. A holding capacity of 100 psi provides a robust threshold that accommodates the pressures typically encountered in emergency situations without compromising system integrity during operation. Understanding this limitation is critical for fire officers when designing, inspecting, or maintaining automatic dry sprinkler systems to ensure they function effectively within their operational parameters. This knowledge helps to prevent system failures that could lead to inadequate fire suppression capabilities.