Magazine Sprinkler Valves

Marine magazine sprinkler valves are used in shipboard fire protection systems to control water delivery from the fire main to protected spaces such as magazine compartments, cargo spaces, hangar decks, and water curtain installations. Their function is to provide hydraulically controlled actuation, either local or remote, with opening and closing logic matched to the vessel’s firefighting arrangement and class requirements.

This category includes Cla-Val 100PM-2, 100PM-4, 100PM-4B, and Navy Standard Valve designs. The 100PM-2 is identified as a normally open automatic sprinkler control valve manufactured to MIL-F-20042, Class 250, for magazine and hangar deck sprinkler service. The 100PM-4 is applied in dry- and wet-type magazine sprinkler systems and is referenced with MIL-F-1183 compliance. The 100PM-4B and Navy Standard Valve configurations are associated with MIL-V-17501F requirements for magazine sprinkler applications.

The 100PM-4B is a globe-pattern, diaphragm-actuated, hydraulically operated remote control valve. It is normally closed by spring force and internal hydraulic control arrangement. Opening occurs when the specified pressure signal is applied to the control port. The valve includes a test port and visual position indication, allowing functional testing of the control circuit without full discharge into the protected space.

Selection should consider whether the sprinkler system is dry or wet, available fire main pressure, required flow area, remote or local actuation logic, and interface with heat-sensing devices, PRP assemblies, or manual control valves. Material compatibility with seawater and, where specified, AFFF solution should also be verified. Maintenance points include diaphragm condition, pilot lines, orifice assemblies, check valves, position indicators, seat leakage, and internal cleanliness, since salt deposits or particulates can delay actuation or prevent full valve reset.