Cryogenic Ball Valves

Extended stem and bonnet to position the stem packing above the cryogenic fluid and providinga column of warmer vapor that insulates the stem seal from the affects of low temperatures.High-density TFM-1600 seats and seals throughout valve enables the valve to be rated down to-260ºF (-162°C) service.The cryogenic valve is based on the Flow-Tek Triad Series, stainless steel, three-piece valvewith threaded and socket weld ends and the two-piece F15 flanged end valve designs.Valve is unidirectional with vent holes in both the stem slot and the upstream face of the ball.This prevents the cold liquids from becoming trapped in the valve.Each valve is permanently marked with a flow direction arrow to prevent incorrect installation.Live loaded stem packing that provides self-adjustment to the stem packing is includedat the top of the extension.Stem primary seal and bearing are locatednear the packing end of the extended stemthus keeping these parts from the lowtemperatures and providing a blow-outproof stem design.Valves are specially cleaned to remove allgrease and oils that may react with theservice media.Each valve after cleaning is packaged andsealed in a heavy poly bag to keep thevalve clean until installation.

Flow-Tek has based the cryogenic valve on our reliable stainless steel Triad and F15 valve designscovering sizes ½" to 4". Flow-Tek valves installed in cryogenic service have proven our design to beboth reliable and durable in this application.

The production, transportation and storage of liquefiedgases present several technical problems to valve designs.The integrity of the stem seals at very low temperatures isthe major hurdle that must be overcome. Specially designedvalve extended bonnets installed to valves offers a safe andefficient method to accomplish stem seal integrity.

At Flow-Tek we designed our cryogenic valve with invest-ment cast stem extensions that move the packing sufficientlyabove the pipeline. The bonnet extension provides a gascolumn that allows the gas to vaporize from contact with thewarm ambient temperature outside the service line. Thisvapor column insulates the stem seal and maintains the sealintegrity.

The standard features of our valve are:1.

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Cryogenic Service Ball ValvesTechnical Bulletin 1008

Data: October 2005 / Page 1 of 2

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CryogenicFlangeValves

CryogenicTriadValve

Cryogenic Service Ball ValvesTechnical Bulletin 1008

Data: October 2005 / Page 2 of 2