Construction Features:

• Bolted bonnet or welded bonnet
• OS&Y
• Threaded ends or socket welding end
• Rising stem
• Rolled-in seat ring

Standards:

• Flanged ends: ASME B16.5
• Butt- welding ends: ASME B16.25
• Face to face: ASME B16.10
• Basic design: API 602、BS 5352
• Inspection and test: API 598

AUTOMA