| 摘要 |
PURPOSE:To prevent shock given to a main valve body and make it possible to form the main valve body of single nonmetal material by making fluid flowing into a pilot valve hole perform buffer and stopping actions for the main valve body. CONSTITUTION:When a movable iron core 17 rises, an outlet flow rate from a pilot valve hole 19 to an outlet 3 becomes larger than an inlet flow rate from a bleed hole 21 to a back chamber 20. Consequently, pressure in the back chamber 20 lowers, and the pressure of fluid flowing into an inlet raises a main valve body 16 to open a main valve hole 4. The main valve body 16 approaches the lower surface of the movable iron core 17, hence the valve seat 22 of the pilot valve hole 19 also approaches there to reduce a gap G between the lower surface and the valve seat. Thus a flow rate passing through the pilot valve hole 19 decreases, and the inlet flow rate from the bleed hole 21 to the back chamber 20 increases relatively. When the main valve body 16 is pressed down, the pressure in the back chamber 20 lowers to approach the movable iron core 17 to the main valve body 16 again. The repetition of the above actions stabilizes the outlet flow rate from the pilot valve hole 19, the inlet flow rate into the back chamber 20, pressure around the main valve body 16 and its dead weight in a mutually balanced state to keep the main valve hole 4 opening.
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