What Is a Pressure Switch in Fire Protection Systems and How Does It Interact With Alarm Valves or Pump Control Panels?

A pressure switch is a critical sensing device used in fire protection systems to monitor changes in water pressure and activate necessary responses during a fire event. When a sprinkler head opens or a pipeline experiences water flow, the system pressure drops. The pressure switch detects this drop and sends an electrical signal to trigger alarms, supervisory systems, or pump activation.

In wet sprinkler systems, the pressure switch is often installed on the alarm valve trim. When the valve trips due to water flow, the pressure rise on the alarm line activates the switch, transmitting a fire alarm signal to the control panel. This ensures timely notification and system monitoring.

In pump-driven systems, such as fire pumps or jockey pumps, the pressure switch plays a key role in automatic control. When pressure falls below a preset level, the pressure switch signals the fire pump to start, ensuring stable water supply during emergencies. After the system pressure recovers, another switch or a dual-setting device stops the pump.

Overall, the pressure switch ensures reliable system operation by linking mechanical pressure changes with electrical control and alarm functions, supporting both early detection and stable firefighting performance.