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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 gaskets 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. The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint. The Y-Pattern valves are available in globe and check design configurations. Gate Valve Design Construction and Specifications Y-Pattern globe and check valves conform to ANSI B16.34.Each is tested according to API598, and markings are per MSS SP-25. Construction is as follows: .Full Port .Piston and ball check .Spring available on request .Loose solid disc .Two piece self-aligning packing gland .Integral back seat .Outside Screw and Yoke(OS&Y) .Bolted bonnet with spiral-wound gasket, threaded and seal welded bonnet or threaded and pressure seal bonnet .Socket weld ends to ASME B16.11 .Screwed Ends(NPT) to ANSI/ASME B1.20