Recently, I have made some non-return valves using O-rings as the clack seal instead of the usual ball beatings. All the main parts for the body have been machined from 3/8in. A/F hexagon brass which is easier to grip for turning and threading in a 3-jaw chuck. Round bar may be cheaper but it can slip while threading with dies.
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机译：最近，我制作了一些使用O形圈作为阀瓣密封件而不是通常的球拍的止回阀。车身的所有主要零件均从3/8英寸开始加工。 A / F六角形黄铜，更易于抓握，以便在三爪卡盘中车削和穿线。圆杆可能更便宜，但在与模具穿线时可能会打滑。
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