Water flow switch as the fluid flow control device which is widely used in different area. Its working principle: Flow switch has a flow channel, there is one permanent magnetic sealed in the channel at sitting piston. In working the fluid flow will give one certain pressure, then the piston will be pushed by fluid pressure and caused the magnetic piston seal inside the device trigger the reed switch closed or open. The diameter of the piston affected its working pressure. If you reduce the flow, the pressure will be with smaller, stainless steel spring will push piston to the reset point. So the reed switch will be affected(open or closed), it can remote alarm or switch action, and also can used as feedback signal in the automatic control system.

The flow switch has a simple structure, high sensitivity, durability and other advantages.