Y-Pattern Valves BoTeli Y-Pattern valves are available in three bonnet designs. The first design is the Bolted Bonnet, With male-female joint, spiral wound gasket, made in F30L/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 penetation strength welded joint is available. The third design is the pressue seal bonnet, with a threaded and pressure seal bonnet joint. The Y-Pattern valves are available in globe and check design configurations. Y-Pattern Design Construction and Specifications BoTeLi Y-Pattern globe and check valves conform to ANSI B16.34. Each are tested according to API598, and markings is per MSS SP-25. Construction is as follows: Full PortPiston and ball check Spring available on requestLoose solid discTwo piece self-aligning packing glandIntegral back seat Outside Screw and Yoke(OS&Y)Bolted bonnet with spiral-wound gasket, threaded and seal welded bonnet or threaded and pressure seal bonnetSocket weld ends to ASME B16.11Screwed Ends(NPT) to ANSI/ASME B1.20.1