| 摘要 |
<p>1,240,016. Valves. QUICKFIT & QUARTZ Ltd., and H. R. RICHTER. 26 Sept., 1969 [16 Oct., 1968], No. 49040/68. Heading F2V. A cock comprises a body 1, e.g. of glass, and an obturating assembly formed by a liner 5, e.g. of P.T.F.E., a clamping device 8, 10 whose length can be varied, and a filling 12 of an elastomeric material that can be compressed by the device 8, 10 to vary the seal pressure exerted by the liner 5 on the body of the cock. In the Figure, the obturating assembly is rotated by a member 4 to vary the flow through connections 2, 3, but in Fig. 3 (not shown), it can be rotated and/or moved axially to vary the flow. The filling 12 can be inserted into the liner 5 in a preformed state, or in a liquid state, in the latter case it can comprise two reactants. The ends of the obturating assembly are sealed by glands 9 and 10a, which need not extend over the liner 5. The liner 5 has a circumferential groove 6 and longitudinal grooves 7, which can extend obliquely. The liner may also be grooved externally to improve the seal. The body can have one or any number of connections 3, with the liner 5 grooved to suit.</p> |
