Actuator for check valve

摘要

An actuator is provided for a check valve, having particular utility in a dry fire control system. The check valve is responsive to a drop in the system air pressure occasioned by opening of one or more sprinkler heads in the fire control system. The movement of the actuator to its open position, establishes a water drain line therethrough, while advantageously also opening a previously sealed outlet for the pressurized air within the actuator. The actuator may respond to either the magnitude of system air pressure drop, or the rate of system air pressure drop.