Diaphragm valves function through the movement of the diaphragm in the valve. As the diaphragm moves, the seat opens and closes. This causes the state of the solenoid valve to change. Within the diaphragm valve, there is a small orifice which allows water to flow to a chamber between the diaphragm and the bonnet. Once the water has passed through the bonnet, it arrives in the solenoid area. The diaphragm control valve then closes, covering the inlet port hole. This movement is controlled by a light spring loaded metal piston.
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