Flow/Pressure Switches

Water flow switches and water/air pressure switches are supervisory and alarm-initiating devices that monitor the operational status of fire protection systems and provide critical feedback to control panels. Their purpose is to detect system activity or abnormal conditions and transmit signals for alarm, supervisory, or trouble response.

Water flow switches are installed on sprinkler system piping and are designed to detect sustained water movement, typically caused by an operating sprinkler. When a preset flow threshold and time delay are met, the switch activates, sending an alarm signal to the fire alarm control panel. This provides confirmation that water is being discharged onto a fire.

Pressure switches monitor system pressures to ensure proper readiness. Water pressure switches may detect pressure changes associated with flow or pump operation, while air pressure switches are commonly used on dry pipe and preaction systems to supervise normal air pressure levels. A drop in air pressure can indicate a system trip or leak, initiating supervisory or alarm signals.

Together, these devices ensure that both system activation and system integrity are continuously monitored, supporting reliable fire protection performance and timely notification.