| 摘要 |
PURPOSE:To simplify a cylinder structurally. CONSTITUTION:A cylinder 12 is composed of an upper half part 18 and a lower half part 20, the former including a flange 22 and a ventilating hole 32 and the latter including a valve seat 40 for a primary valve and a seat retaining projection 41. The lower half part 20 and the upper half part 18 are joined together by the means other than threaded engagement to fabricate the cylinder. |
