Magnetic flow switch can output ON or OFF signal accordingto the flow,it is an important component of the fluid flow control system.When the flow in thepipe is lager than start-up volume,magnetic valve core is forced by the flow pressure to move forward then trigger the reed switch.When the flow recrease to a volume smaller than start-up volume,magnetic valve core is forced back to theoriginal place by the repellant force ofthe reset magnet, the reed switch recovers.