diaphragm valves are controlled by pressure
The diaphragm Valve is controlled by the pressure on either side of the diaphragm. Pressure is equalized on both sides of the valve, due to an orifice between the two chambers.
When pressure is equal, a spring causes the diaphragm to close off the waterway.
As the float rises, it activates the operating valve, depressing the needle on the diaphragm valve.
Water streams out of the needle, relieving the pressure in the rear chamber of the Valve. This relief opens the valve, allowing water to flow through the ejector and pull water out of the sump pit.
When the float goes down, the needle is released and water accumulates behind the diaphragm. The pressure builds behind the diaphragm and causes it to close the waterway, stopping the pump from running.
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