Abstract
The widespread application of large all metal vacuum valves has been inhibited by the high costs resulting from the stringent design specifications. Superior reliability and the means of reducing costs are some of the recent developments. This paper illustrates the special design requirements, the current state of the art and some new design concepts. The performance of main seals that have been used is assessed with their compatability to overall valve requirements emphasized. Actuation and seal force generating mechanisms are analysed and the operating characteristics of various gate valves are discussed. Experimental results of a new valve are presented. The valve uses a conical seal plate which utilizes radial expansion for sealing. This seal plate is actuated and translated by a simple stroke mechanism. This valve offers improved reliability and life combined with more economical construction.
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