Nainai valves are available in Three 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. The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.
Construction is as follows
※ Full port or conventional port；
※ Outside screw and yoke (OS&Y)；
※ Two piece self-aligning packing gland；
※ Bolted bonnet with spiral-wound gasket, threaded and seal welded bonnet or threaded and pressure seal bonnet；
※ Integral backseat；
※ Socket weld ends to ASME B16.11；
※ Screwed ends(NPT) to ANSI/ASME B1.20.1；
※ Disc can change for throttle type、needle type、ball type and check type.