• The YFL API 6D pipeline fully welded ball valve with single welding seam makes the body more compact, strong and rigid;
• The YFL LF2 fully welded body ball valve has forging body to avoid shrinkage cavities, pin holes, cracks, sand holes and other defects;
• Trunnion ball and floating seat design reduces operate torque, ensures sealing performance under low pressure or without pressure and achieves better sealing when pressure increased;
• Separated ball and stem design minimizes the torque and impact on stem;
• Body and stem are designed to be double sealing and secondary seal is fire safe;
• Cavity pressure self relief when spring loaded single piston effect seat structure;
• Bidirectional sealing when double piston effect seat structure;
• Emergency sealant injection valve as subsidiary sealing device;
• Double block and bleed structure to discharge through bleeding device;
• Fire safe, anti-static and anti-blowout stem design;
• Stem key limit device ensure the valve switch position;
• Extended stem available for underground installation;
• Transit sleeve pipe available for BW ends if needed.

Product range:

• Size: 2"～56"
• Pressure rating: Class 150～2500
• End connection: RF RTJ BW
• Body materials: carbon steel A105 low temperature steel LF2 stainless steel F304 F316 F304L and F316L duplex stainless steel F51 and F53 super duplex stainless steel F55 etc.
• Seat materials: PTFE RPTFE NYLON DEVLON PEEK PPL FKM or metal to metal seal etc.
• Operation: Bare stem Wrench gear electric pneumatic electro-hydraulic gas over oil actuator

Technical standards:

• Design: API 6D
• Face to Face: API 6D
• BW ends: ASME B16.25 ASME B31.8
• Flanged ends: ASME B16.5 ASME B16.47
• Wall thickness: ASME B16.34
• Fireproof test: API 607 API 6FA
• Test and inspection: API 598 API 6D
• Pressure and temperature rating: ASME B16.34