| 摘要 |
Clamps disposed at opposite sides of a tube of PTFE resin or other crack sensitive material maintain regions at each side of the tube in constantly constricted fluid sealing condition free from crack inducing flexure secured in sealing embrace about a smoothly curving filler piece. In combination with a pair of compressor members there is thus provided a constrictable tube valve having a tube of crack sensitive material which wild not crack upon valve manipulation. |
