In a solenoid valve comprising a first solenoid valve for regulating pressure and a second multifunctional solenoid valve integrated with the first solenoid valve, even if a solenoid of the first solenoid valve is energized, a diaphragm valve of the solenoid valve is not immediately opened, thereby providing a safe and compact solenoid valve.API CAST STEEL VALVES The first solenoid valve comprises a first spring provided between the upper end of a plunger which is movable by the solenoid and a stator,API Cast Steel Valves while the lower end of the plunger is disposed to be brought into contact with the diaphragm valve and a second spring is provided for urging the diaphragm valve in the direction to close it even if the plunger is moved away from the diaphragm valve and the second solenoid valve which is integrated with said solenoid valve for controlling to selectively open or close a closing valve and a one way valve.

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