Thermax Bellow Seal Valves are specially designed globe-type isolation valves that provide zero stem leakage by using a welded metallic bellows instead of conventional gland packing. This design eliminates fugitive emissions, reduces steam and energy losses, improves plant safety, and ensures long, maintenance-free service. These valves are ideal for steam, condensate, thermal oil, gases, and hazardous process fluids. Design & Construction: Body Material: ASTM A105 Forged Carbon Steel / Cast Steel (model dependent) Bellows Material: Multi-ply Stainless Steel (SS316Ti) Stem Material: ASTM A276 Gr. 410 Stainless Steel Seat Ring: Integral Stellited Seat Plug/Disc: Stellited Stainless Steel Gland Packing: Graphite (secondary sealing) Gasket: Spiral Wound SS304 with Graphite Filler Operation: Handwheel Operated End Connections: Flanged / Butt Weld / Socket Weld Standards & Specifications: Design Standard: ASME B16.34 / EN ISO 15761 / BS 1873 Face-to-Face: ASME B16.10 Flange Standard: ASME B16.5 Testing & Inspection: API 598 Pressure Classes: Class 150 / 300 / 800 Available Sizes: DN15 (½“) to DN250 (10“), depending on model IBR Approved: Available for steam service; non-IBR models also available. Features: Zero stem leakage with metallic bellows Four-point sealing for maximum safety Maintenance-free operation with long service life Prevents steam and energy loss Secondary graphite gland packing for additional protection Integral stellited seat for excellent sealing Suitable for high-pressure and high-temperature applications Easy installation and reliable operation Applications: Steam Distribution Systems Condensate Recovery Lines Boiler Plants Thermal Oil Systems Chemical & Petrochemical Industries Power Generation Plants Textile & Food Processing Industries Pharmaceutical Plants Oil & Gas Industries Advantages: Eliminates fugitive emissions Reduces maintenance and operating costs Improves process safety and environmental protection Increases energy efficiency by preventing steam leakage Long operational life with minimal downtime Ideal for critical industrial isolation applications