Loading pressure - either air or inert gas - is applied to tge tope of the diaphragm by the loader to open the main valve against the valves spring and inlet pressure. After the valve is open, more loading pressure is applied to the top of the diaphragm to keep the valve open while building up the desired reduced pressure under the diaphragm and to restore equilibrium under flow conditions.
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Kalupur, Ahmedabad, Gujarat