• Bolt cover, structure of flip-chip balanceable pressure and light on/off operation. An oil grove is set between valve body and seal surface, which may infuse the seal grease to increase the seal capability.
• Standards compliance
• Design and Manufacture: API 599,API 6D
• Face to face(end to end): API B 16.10
• Flanged connection: ANSI B16.5
• Butt welded end: ANSI B16.25
• Test and inspection: API 598,API 6D