| 摘要 |
A cap quickly sealing a distribution pipe of a vacuum chamber having a flange includes a cup shaped body that fits over the flange and contains a sealing disc with O-ring that presses against the flange surface. The cap is locked to the flange by steel balls that partially pass through holes in the body and wedge under the inserted flange, the balls being held or released by an outer sleeve with two interior ball races of a large and a smaller diameter so that drawing up the sleeve will permit the balls to enter the large diameter race and fall back to release a flange in the body.
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