| 摘要 |
<p>1,270,960. Pipe joints; pipe stoppers; valves. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 28 Aug., 1969 [2 Sept., 1968], No. 42847/69. Headings F2G, F2P and F2V. A joint to limit or prevent the escape of a main gas between two parts in surface contact with each other comprises a passage between the two contact surfaces, having an inlet and an outlet opening for an auxiliary, different gas which scavenges leakage of the main gas. The joint may connect pipes, be used in a valve cock, or in a stopper for a pipe. In one form, a valve comprises a cock body 1, Fig. 1, and a plug rotatably engaged therein, the body being formed at its contact surface with an annular recess 11 providing a passage for an auxiliary gas to scavenge a gas leaking from the main controlled passage 8, 9. As shown, the plug 2, 3 is constituted by a tapering portion 2 of a resilient material and a component 3 made of glass, biased apart by a spring 6. The combined action of a second spring 5 and the spring 6 urges the plug portions 2, 3 in the direction of the closed end 7. Passages 11, 12 provide the inlet and outlet for the auxiliary gas flow, which scavenges the leakage gas seeping along the contact surfaces. Alternatively, the plug 2, 3 may be of unitary construction. A second embodiment relates to a stopper 15, Fig. 2, for a tube 16. A recess 17 in the stopper connects with ducts 18, 20; 19, 21 through which an auxiliary gas is fed to scavenge leakage between the contact faces. A joint of similar construction may be effected between two pipes, the stopper 15 then having an open end.</p> |
