Valve seat arrangement

Details Valve seat arrangement Valve seat arrangement

1997-06-04

2000-10-24

Chambers, A. Michael

Fluid handling

Processes

Cleaning, repairing, or assembling

137315, 251360, 251362, F16L 5518

Patent

active

061351326

ABSTRACT:
A valve seat arrangement that uses a TEFLON valve seat. The seat is held in place and kept from cold flowing in undesired ways by an outlet guide and a retainer. The valve seat arrangement is assembled using interference fits to avoid damage to the TEFLON seat. To overcome technical difficulties associated with the interference fit, a particular method of assembly is used. Specifically, the seat is heated and mounted on the outlet guide. Once the guide/seat assembly returns to ambient temperature, it is immersed in liquid nitrogen to force it to shrink. After removing the guide/seat assembly from the liquid nitrogen, the retainer is mounted thereon and the assembly is allowed to return to ambient temperature, thereby achieving another interference fit. If the retainer were heated to force it to expand, its temperature upon mounting on the seat would damage or destroy the seat, causing leakage through the seat.

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