Standards
1.Design and Manufacture: ANSI B16.34, BS1873
2.Face to face: ANSI B16.10
3.Butt welded end: ANSI B16.25
4.Test and inspection: API598

Features
1.Size: 2″ to 18″
2.Rising stem
3.Outside screw and yoke,
4.Material: Carbon steel and stainless steel,etc
5.Construction: Bolted Bonnet(class150-600),
Pressure Seal Bonnet(Class900-2500)