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Flow switches are mechanical devices used in controlling the flow of air, steam, or liquid. A flow switch operates by conveying a trip motion (relay, reed switch, paddle) to another machine within the system, usually a pump. The trip signal will indicate to the pump to turn on or turn off.  It is necessary to provide damage protection and circuit cooling or adjust flow rates that are too high or too low.

1) Vane-Operated Flow Switch:

A vane-operated flow switch relies on fluid pushing against an internal paddle. As the flow drops to preset levels, it triggers an internal magnetic mechanical and coupling switch actuation lever which essentially trips the switch.

2) Variable Area Flow Switch:

This device has an internal piston which activates the switch. The flow enters a port and adds pressure to the magnetic poppet; once this pressure hits the preset level, the switch will turn off.

3) Ultrasonic (Doppler) Flow Switch:

Attached to the outside of a pipe, ultrasonic sensors send signals when it detects a change in the flow.


"Instrumtech" deals in all reputed make of Flow Switches in national and international market.

*Images shown here are for understanding purpose only. “Instrumtech” doesn’t claim any legal right for these pictures.