| 摘要 |
PURPOSE:To prevent the generation of squeeze by urging the pressing member of a valve piece towards a guide sleeve. CONSTITUTION:The lower edge of a pressing shaft 11 which is axially supported by a guide member 8 and presses a spherical valve piece 9 at the top edge is fixed at the lower edge of a piston 2. A spot facing part 25 is formed onto the surface where the valve piece 9 of a pressing member 12 contacts in a little eccentricity from the axis line 24. When the valve piece 9 departs from a valve seat 20, the valve piece 9 shifts to the spot facing part 25, and the force component for urging the pressing member 12 towards a guide sleeve 13 acts. Therefore, even if the jolting due to the abrasion between members is generated, generation of squeeze is prevented.
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