| 摘要 |
In a two-port solenoid valve having a valve head to open and close the valve seat operated by an electromagnet, 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. When 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, 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.
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