ZHEDONG Valves are available in three bonnet designs.The first design is the Bolted Bonnet,with male-female joint,spiral wound gasket,made in F304L/grapthite.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

1.Full port or conventional port;
2.Outside screw and yoke(OS&Y);
3.Two piece self-aligning packing gland;
4.Bolted bonnet & sprial wound gasket seal bonnet;
5.Bolted bonnet with sprial-wound gasket,threaded and seal welded bonnet or threaded and pressure seal bonnet;
6.Integral back seat;
7.Socket weld ends to ASME B16.11
8.Screwed ends(NPT)to ANSI/ASME B1.20.1.