9 JAMESBURY VALVE SOLUTIONS Wafer-Sphere Special services Emission-Pak Live-Loaded Packing When enhanced emissions control is needed to comply with evolving emissions standards, Emission-Pak live-loaded packing is available. The Emission-Pak live-loaded packing assembly includes PTFE V-ring packing live-loaded with disc spring washers for standard construction valves and graphite packing with Inconel disc springs for Fire-Tite valves to maintain a constant packing force without overcompression. It is available with new valves or as a retrofit kit for existing valves. Additional options, available with or without the Emission-Pak live-loaded packing, include double packing or double packing with monitoring port to facilitate testing of the primary seal and allow detection of a potential leak problem. Refer to the How to Order section at the end of this bulletin for specific ordering instructions. The operating torque of valves with Emission-Pak live-loaded packing will increase. (Refer to the torque equation in the Valve Torque Data section). Steam Service Wafer-Sphere butterfly valves are well-suited for a wide range of steam applications. These range from PTFE-seated valves capable of handling lower pressure to valves with Xtreme seats. Ratings of Wafer-Sphere valves in this bulletin for on-off steam service are as follows: Valves may be derated based on shaft material selection. Cryogenic Service UsingWafer-Sphere with unique polymeric and polymeric/ metal composite seats, cryogenic Wafer-Sphere valves are rated to give tight, reliable shutoff on service extending from -320˚F (-196˚C) to ambient condition at pressures up to 1440 psi (99 bar). Cryogenic seats for valve sizes 3” – 12” (DN 80 – 300) are composite. Seats for sizes 14” – 48” (DN 350 – 1200) are Kel-F® material. See Bulletin W130-1. Chlorine Service Wafer-Sphere valves reliably control the flow of both liquid and gaseous chlorine. The patented seat design insures positive, leaktight shutoff of this lethal substance. A range of key materials permits selection of the Wafer-Sphere valve best suited for the moisture content of the chlorine that is to be handled. Valves for chlorine service are specially cleaned to preclude possible reaction of the chlorine to foreign substances. For further information see Bulletin W150-2. Oxygen Service Wafer-Sphere valves are available specially prepared for oxygen service, capable of filling a wide range of applications that include both on-off operation and proportional control. A rigid procedure is followed in preparing components, assembling, testing, and packaging these valves to assure cleanliness and to avoid the inherent danger of oxygen’s reaction with grease, oil, or other foreign matter. Bulletin W150-3 contains additional details. NACE Service ANSI Class 150 and 300Wafer-Sphere valves are available to comply with the NACE MR0103 standard. These valves are well suited for oil and gas industry applications requiring sulfide stress cracking resistant metallic materials. Abrasive Service For applications involving slurries or gasborne solid particles, Wafer-Sphere valves are available with the disc hard-coated with tungsten titanium carbide (TTC). Service life of the valve is increased significantly with the assurance of extended sealing capability. This hard coating is also available on application on other valve components that may be subject to wear in other unusual process conditions. Vacuum Service StandardWafer-Sphere valves are rated for tight shut-off of vacuum to 2x10-2 torr. Special high vacuumWafer-Sphere valves can be provided for vacuums to 1x10-5 torr. Additionally, high vacuum valves can be certified to have a leakage rate not to exceed 1x10-5 cc/sec. of helium at 1x10-5 torr vacuum. Refer to Bulletin W150-4 for details. High-Cycle Option Testing in the Jamesbury R&D laboratories indicates that a combination of components, includingXtreme ( X) seat, filled super PTFE shaft seals, 316 SS/Woven PTFE shaft bearings, PEEK®-filled PTFE thrust bearings and excluder rings, yields significantly longer life than a standard configuration valve. Actual cycle performance is subject to media, pressure, and temperature conditions. Applications such as oxygen, nitrogen, hydrogen, water, and other clean media are ideally suited for this option. Warning: Avoid any media containing acids or chemicals such as chlorine, bromine, sulfur dioxide, or steam, or temperatures that exceed 325˚F (163 ˚C).
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