| 摘要 |
PURPOSE:To heighten the durability of parts by providing an open-and-close valve comprising a valve body loosely fitted to a valve rod in such a manner as to incline and a spring for urging the valve body to a valve seat through the valve rod to lessen force working upon a sliding portion. CONSTITUTION:An open-and-close valve 20 comprises a valve rod 21 piercing through a through hole 18 and the upper surface plate of a holder 16, a seat member 23 engaged with the lower end of the valve rod 21, and a spring 24 for urging the valve rod 21 upward through the seat member 23. The hole diameter of a valve 22 is formed larger than the shaft diameter of the valve rod 21 inserted in he hole, whereby a gap 26 is set between the inner peripheral surface of the valve body 22 and the outer peripheral surface of the valve rod 21 in such a manner that the valve body is inclined by action of the valve rod 21 to change its own posture. |
