| 摘要 |
PURPOSE: A processing jig for the main spindle center of a ball for a ball valve is provided to improve the precision, and to maximize the reliability by processing the main axis center accurately to the through hole of the ball. CONSTITUTION: A jig(1) comprises a base plate(2) having a through hole(21) formed in the center and plural posts(22) arranged in the edge; a ball placing plate(3) having a round ball placing hole(31), a guide member(32) inserting the post of the base plate, a spring placing groove formed between guide members, and a compression spring inserted to the spring placing groove; a ball placing ring(4) placed on the base plate through the ball placing hole and placed below the upper surface of the ball placing hole in lifting up the ball placing plate by the compression spring; and a pressure plate(5) having an assembling hole(51) placing the through hole accurately and vertically by placing the ball in the ball placing hole and fixing with an assembling member(12).
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