What is a Water Flow Switch, and How Does it Work

What is a water flow switch?

A water flow switch is a tool that perceives movements of the water in a pipe. It acts for fire protection purposes in case there is a fire. 

It is designed as a means of sending an alarm to a fire alarm panel. The department is continuing to flow water, which occurs through the piping and activating the head sprinkle. 

Those detect used for the water flow include the following: Vane of the plastic, a paddle installed through an opening hole. Those holes normally are in the size of the 10 to 40 schedule fire sprinkler pipe. It can either be vertically or horizontally.  

The system sensor of the water flow is used to detect the mechanical. The water flow’s optional performance is used to detect and a mountain of them and ensure the water flow changes. The flow of the water in the pipe sometimes varies according to the user.

When you are using the water flow switch on the sprinkler system has three main functions as follow: 

How Does is water flow switch Work

A flow refers to the gas, steam, and liquid movement that passes within the piper to trigger the flow switch’s actions. 

Used of the flow switch 

The liquid flow switch applies to the swimming pool’s chlorination, air-condition, and liquid transfer systems. 

Therefore, a water flow switch is used for implanting the water sprinkler. For example, in a fire outbreak, a trigger electrical of the fire alarm device is turned on. 

The airflow switch is used to clean the room filter for exhaust ventilation and air treatment. 

Variable area flow switch: This device has an internal piston that activates the switch. The flow enters a port of the magnetic poppet. Once it reaches the pressure level, the switch will turn off automatically. 

Vane-operated flow switch: It relies on the fluid pushing against the internal paddle. Therefore, as flow drops preset levels, the switches’ mechanical and coupling are actual the lever, which are important for the trip of the switch. 

Ultrasonic flow switch: This is attached to the outside of your pipe, which sends the signal when it detects the flow changes. 

Measuring the flow rate accuracy is important: This is done by calculating the changes in the velocity’s dynamic energy. Therefore, the velocity is turned independent of the pressure of the liquid’s different forces through the pipe. This is a cross-section area of the pipe that is constant upon the difference of the pressure. The cross-sectional area of the pipe is good for indicating the flow rate. The flow rate calculation must be done to help you when setting the flow switches for the predetermined close function. 

Flow switches: The work of the switch is based on the set requirements. They can stop the motor whenever there is a flow of triggering for the same motor that runs on the flow. It raises the alarm when the flow arrests, and it can turn off the alarm when the flow reaches an appropriate level. 


The flow switch works depend on specific applications. You will find out that some of the flow works well to measure the selected tool’s different things. Those, as mentioned above, are how the water flows switches functions. 

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