Application expertise, along with a high quality valve, is needed in order for the valve to operate effectively and efficiently in these demanding facilities. This article presents the latest in valve innovations for liquefaction plants.Three innovative valve designs that command a significant share of the global LNG market are: Triple offset rotary tight isolation valves.  Noise control and automation in control valves.  Single and dual flapper non-return (check) valves.There are several types of valves that could, and have been, used in cryogenic isolation services, including ball, gate, and globe valves. When selecting cryogenic ball valves for LNG, one must consider a couple of common issues, including the polytetrafluoroethylene (PTFE) based seat and trapped cavities. PTFE-based seats produce thermal expansion differences between the ball and seat materials and are approximately five times in favour of PTFE. Another challenge with cryogenic ball valves is the trapped cavities, which force the use of a pressure relief mechanism as the liquid can expand over 600 times explosively. Generally, that requires unidirectional isolation only. Gate and globe valves use rising stem designs, with wedge or point load seating; both of which are more challenging to provide and maintain sufficient fugitive emission and isolation quality. The triple offset rotary tight isolation valve eliminates these challenges.

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