A solenoid valve comprises a housing including an inlet port for fluid communication with a positive pressure source and an outlet port for fluid communication with a negative pressure source;GLOBE VALVE a passage for fluid communication between the inlet port and the outlet port; and an axially bi-directional solenoid-actuated valve in the housing for opening and closing the passage, including an electromagnetically movable valve member having a sealing area exposed to the negative pressure from the outlet port when the valve means is in the closed position;Forged Steel Valves and a diaphragm defining a back pressure chamber in fluid communication with the passage for offsetting the effect of the negative pressure on the exposed sealing area and reducing the electromagnetic force required to move the valve member. A solenoid valve of the hung diaphragm type includes a diaphragm assembly having a pilot valve seat mounted for movement toward and away from a main valve seat in a valve body,Check Valves a plunger assembly consisting of a valve disc holder reciprocably mounted in the pole piece of the electromagnetic valve resiliently supports a valve disc for cooperation with the pilot valve seat, being actuated by a plunger slideably mounted in an enclosure tube. The valve holder is biased to an upper position and a pickup extension spring is coupled between the valve holder and diaphragm valve assembly to lift the latter from the main valve seat. A necked down end of the valve holder prevents abrasion at the edge of the pole piece while a groove in the actuating face of the plunger prevents excessive distortion of the end of the pole piece due to repetitive impacts.

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