The packing set comprises an endless U-ring firmly supported by a header ring. The lips of the U-ring are slightly flared to provide an interference fit for initial sealing. When system pressure is applied, the sealing force is increased...
Combinations of single rings and matching headers are generally known as duplex rings to distinguish them from unit seals (implying integral construction of a combination). The term is applied particularly to combinations of a header with a fork or...
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