| 摘要 |
PURPOSE:To improve the lightness of operation and airtightness by inserting an elastic filling ring into the recessed groove part of a cock body in a truncated inverted conical form and screw-jointing a tubular body inserted into the cock body together with a cock box. CONSTITUTION:The conical slidable fitting surfaces 4 and 6 of a cock body 4 and a cock box 7 maintain airtightness by the projection of the elastic filling ring 9 such as an O-ring, etc. fitted into a recessed groove part A formed onto the circumference of the truncated inverted conical surface 4 of the cock body 5. A tubular body 17 in cooperation in the vertical direction with the cock body 5 is inserted between a handle 15 and the cock body 5, and a male screw 18 is formed onto the outer surface of the tubular body. The male screw is screwed into a female screw 19 formed integrally with the cock box 17, and the cock body 5 can be moved vertically by revolving a handle 20. When the handle 15 can not be moved, a gap is formed between the conical surfaces 4 and 6 by revolving the handle 20 by a prescribed angle, and the cock body 5 can be operated lightly.
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