Which component in dry pipe valves operates based on pressure differential?

The clapper assembly in dry pipe valves is designed to operate based on pressure differential. This component consists of one or more hinged plates that open or close in response to changes in pressure between the air and water sides of the system. When the system is charged with air, the clapper remains closed, preventing water from entering the piping. Upon activation of the system, usually triggered by a fire event, a drop in air pressure allows the clapper to open, permitting water to enter the pipes and flow to the nozzle. This mechanism ensures that the sprinkler system remains dry and can efficiently deliver water when needed.

In contrast, the water flow detector monitors water flow through the system, rather than responding to pressure differences. The air pressure gauge simply indicates the level of air pressure in the system without involving a mechanical operation based on pressure changes. The control valve actuator is responsible for operating the control valve, which may involve pressure differentials but does not specifically encompass the function performed by the clapper assembly in responding to those differential pressures. Thus, the primary role of the clapper assembly is crucial for the specific operation of dry pipe valves when it comes to managing pressure differentials effectively.