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FLOWSPEC forged steel gate valves are available in three bonnet designs, the first design is bolted bonnet with male-female joint spiral wound gasket made in F304L/graphite, ring joint gasket is also available on request. The second design is welded bonnet with a threaded and seal welded joint, a full penetration strength welded joint is available. The third design is the pressure seal bonnet with a threaded and pressure seal bonnet joint.
Applicable standards & specifications
Design and manufacturing: API 602/BS5352/ANSI B16.34
Face to face: Manufacturer Standard
Face to face, Flanged, ASME B16.10
End flanges: ASME B16.5
Butt welding ends: ASME B16.25
Socket welding ends: ASME B16.11
Screwed ends: ASME B1.20.1
Inspection and test: API 598
Design descriptions
Outside screw and yoke (OS&Y)
BB, bolted bonnet
Choice of WB, welding bonnet
Single solid wedge, fully guided
Renewable seat rings
Yoke integral with bonnet
Rising stem and non-rising hand wheel
SW, socket welding ends
SC, screwed ends
BW, butt welding ends
Flanged ends
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