Bellow Sealed Valves BoTeli Bellow Sealed valves are available in two bonnet designs. The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F304L/graphite. Ring joint gasket are also available on request. The second design is the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available. Bellows Sealed Valve Design Construction and Specifications BoTeLi bellows sealed valves conform to API602, MSS-SP-118(as applicable), BS5352 and ANSI B16.34. Each are tested according to API598, and marking is per MSS SP-25. Construction is as follows: Two piece self-aligning packing glandBolted bonnet with spiral-wound gasket or threaded and seal welded bonnetIntegral backseatSocket weld ends to ASME B16.11Screwed Ends(NPT) to ANSI/ASME B1.20.1Outside Screw and Yoke(OS&Y)Grease nipple for stem