| 摘要 |
<p>A flexible ring seal particularly intended for sealing the joints between the flanges of glass-lined pressure vessels and their associated piping systems comprises a coiled strip (1, 2) of flexible material which is enclosed within an envelope (5) of low friction co-efficient inert material such as PTFE. The strip has at least one transverse convolution and side margins of increased thickness such that in the coiled structure the adjacent convoluted parts are separated by air spaces. Further, there is preferably provided a closure ring (6) which faces the radially innermost coil of the coiled structure to prevent accidental entry of the envelope into a groove which is formed by a convolution. The strip may be made of stainless steel or any other ferrous or non-ferrous metal or alloy preferably capable of imparting resilience to the strip. Alternatively the coiled strip may be made of synthetic plastics or elastomeric material which may have an embedded metal reinforcing strip.</p> |
