| 摘要 |
PURPOSE:To simplify and facilitate advancing/retraction of valve body by inserting an insertion chip of valve seat pushing tool between valve seats and making the interval of valve seat longer than the distance between vertical faces at the opposite sides of the valve body. CONSTITUTION:Lower end portion of a tubular member 61 in a valve seat pushing tool 60 having outer diameter slightly shorter than the diameter of an opening in the upper face of a valve chamber 11 and inner diameter slightly longer than the outer diameter of a valve body 40 is cut from the opposite side over a range slightly longer than the depth of the valve chamber 11 so as to form an insertion chip 62. When the insertion chip 62 in the valve pushing tool 60 is inserted between valve seats 34, interval of valve seat 34 can be made longer than the distance between vertical faces at the opposite sides of the valve body 40, and thereby advancing/retraction of the valve body 40 is facilitated.
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