| 摘要 |
<p>1,009,222. Valves. VARIAN ASSOCIATES. July 19, 1963 [Aug. 6, 1962], No. 28759/63. Heading F2V. [Also in Division B4] In a high vacuum valve for use at high temperatures, e.g. 300‹ C., a seal is effected at seat 17 between inlet 12 and outlet 13 by a replaceable ductile metal, e.g. copper, washer 22 which is retained within the recessed end of a plunger 21 forming part of a closure assembly 14 bolted, and pinned by clamping bolt 25, to a sleeve 23 and displaceable therewith, in screwthreaded engagement with nut member 27, by insertion of a tool into square or hexagonal socket 31 and rotation thereof. A gas-tight seal between member 27 and the plunger 21 is provided by a metal bellows 29, welded thereto. The washer 22 is removed and replaced, via circular outlet 13 which is longer than inlet 12, upon displacement of plunger 21 and engagement of grooved washer knob 22 with a tool, restrained against displacement therewith, within inlet 13. Alternatively, inlet 12, seat 17, washer 22 and outlet 13 may be elliptical with inlet 12 and outlet 13 of the same size. The seat 17 may comprise faces 41 and 42 inclined at an angle of 5-20 degrees respectively to the face of and the normal to the washer 22. Alternatively the inclined seat face 41 may be provided with a groove 43 to obtain increased sealing force. Specification 1,009,221 is referred to.</p> |
