In a two-port solenoid valve having a valve head to open and close the valve seat operated by an electromagnet, Hydraulic control valves the valve member is slidably connected to the valve housing by means of a stem and which cross-sectional area is somewhat smaller than the effective area of the valve port so that a force to close the valve is developed by the pressure of the fluid on the valve inlet side when the valve is closed. API Cast Steel ValvesWhen current is momentarily passed to the electromagnet, the armature of the magnet moves the valve head over such a small distance as is just enough to slightly move the valve head away from the valve seat, thereby causing the fluid pressure in the outlet,CHECK VALVES this pressure works thrust force on the valve head to opening direction, and the valve is hold in the fully opened position. As the armature of the magnet is not required to do any more work than to slightly open a passage between the inlet and the outlet, this permits shortening the travel stroke of the armature and thus reducing the size of the electromagnet in the solenoid valve. A two-port solenoid valve, utilizing a solenoid comprising: a valve housing having a valve support member, an inlet and outlet and a passage communicating said inlet with said outlet; a valve seat provided on an inlet side of the passage; a valve head for opening and closing the valve seat and adapted to be acutated by said solenoid having an armature; a stem wherein said valve head is connected to said stem, said stem being slidably supported through said valve support member of the valve housing wherein the cross sectional area of the stem is smaller than the effective area of the valve seat, and wherein a valve closing force is generated only by the inlet side fluid pressure; a push rod having a tip portion driven by said armature driven in a valve opening direction and positioned opposite to the valve head in a valve closed position; said push rod directly engaging said valve head, wherein said armature moves the valve head via said push rod over a distance so as to move the valve head away from the valve seat when electric current is momentarily supplied to the solenoid.

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