Valve Emergency Pull Station

Valve Emergency pull stations on water control valve trim are manually operated devices intended to directly initiate fire suppression system discharge, typically for deluge or preaction systems. Their primary function is to release the priming pressure holding the main valve closed by mechanically venting air or water from the valves pressure chamber. This results in immediate opening of the valve and water discharge through open sprinklers or nozzles.

They differ from standard building fire alarm pull stations in both function and outcome. A typical building alarm pull station only initiates an alarm signal—activating notification appliances and alerting occupants and emergency responders—but does not directly release water or suppression agents. In contrast, emergency pull stations tied to valve trim are part of a releasing system, meaning their operation results in physical system actuation and discharge.

Most valve emergency pull stations are provided with a protective box or enclosure to prevent accidental or unauthorized actuation of the fire protection system.

The enclosure—often a hinged cover or break-glass type—serves as a deliberate-action barrier, requiring an intentional step (lifting a cover or breaking glass) before the pull station can be operated. This reduces the likelihood of accidental contact, tampering, or misuse, particularly in industrial or high-traffic areas.