Application of IC card smart water meter

　　The opening and closing control mechanism of IC card smart water meter adopts back-type diaphragm valve mechanism. The diaphragm closes when it is close to the back of the spine, and opens when the diaphragm leaves the back of the spine. The opening and closing of diaphragm valve are controlled by DC electrical motor and drive mechanism. When the direct current is input to the direct electrical motor, the direct electrical motor turns forward and closes diaphragm valve to stop water supply; When the reverse direct current is input to the direct current electrical motor, the direct current electrical motor reverses and turns on diaphragm valve to supply water. The opening and closing stroke of diaphragm valve is controlled by the opening and closing limit switch installed on the drive mechanism.