#117 Severe Service Valves - the logical choice for safely handling phosgene.  Problem: Phosgene is a hazardous fluid. When choosing valves for this application, processors want assurance of sure shutoff and assured control of fugitive emissions. For processors who take safety concerns seriously, there has been only one logical valve choice for nearly a decade.  Solution: For safe handling of difficult fluids, the Tufline Severe Service Valve is the logical choice. This is especially true where thermal cycling is also a consideration. This valve has proven itself over and over again in the most difficult processing applications. Using stringent EPA recommended testing procedures, the Tufline Severe Service Valve has also proven itself superior in side-by- side tests against competitive valves. Building on the inherent and formidable emissions-stopping attributes of the sleeved plug valve, this valve employs a "triple" sealing system. Seal #1 is formed by the PTFE sleeve where it encircles the upper portion of the plug. Seals #2 and #3 are formed by the two sets of packing separated by a lantern ring. This valve is designed with a patented shrink-seal lip to control fugitive emissions, even with extreme thermal cycling conditions. Temperature changes cause unequal expansion and contraction of valve components and sealing elements. With thermal cycling, packing shrinkage often leads to leakage along the stem. With the patented Tufline design, radial shrinkage of the packing actually tightens the seal. An overhanging lip is machined into the interior bore of the bonnet. Radial shrinkage of the packing causes the packing to tighten against the lip, preventing leakage to the atmosphere.  Results: Plant personnel around the world breathe easier knowing that the Tufline Sleeved Plug Valve is handling the most difficult and hazardous fluids at their facility. Index of all performance report case histories.