DE3001458

A valve apparatus having a poppet valve carrying a magnet and a switch responsive to movements of the magnet wherein the switch is activated and deactivated by movement of the magnet into and out of proximity with the switch. The spring biased poppet valve is movable from a closed position under the influence of a predetermined fluid flow rate in one direction to an open, switch activating position and then is returned upon a slight reduction in fluid flow in the opposite direction past the switch activating position to a switch deactivating position intermediate the latter and the valve closed position. The valve is formed with a specially configured nose portion to provide poppet valve travel at predetermined fluid flow rates to activate and deactivate the switch.