-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.