Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1992-08-17
1994-07-19
Walton, George L.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251161, 251173, 251174, 251175, 251214, 251306, 277 27, 277164, F16K 2500, F16K 4104
Patent
active
053301560
ABSTRACT:
A sealing arrangement for a valve or shaft is disclosed which is designed to respond to movements of a rotatable element in a particular manner and to increase sealing pressure with increasing fluid pressure. The seal undergoes a radial compressive type movement as the pressure within a vessel housing increases between opposed sealing sleeves and this causes an increase in the sealing pressure. This predetermined movement of the seal creates a spring bias in the seal, urging the seal to return to the original, less stressed condition. Preferably, the seal is of a composite structure and a particular component of the intermediate wall section creates this spring bias. This structure has improved operating characteristics and accommodates a wider range of resilient materials to be used for the sealing washer.
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