• The YFL high performance butterfly valve with double offset design makes the valve disc separate from the body seat promptly when open, substantially eliminates unnecessary extrusion and scraping, reduces the operate torque, reduces the abrasion of seat and disc seal ring, extends the service life;
• The YFL double offset butterfly valve can adopt multilayer metal seal to stand higher temperature thanks to much less extrusion and scraping, but the sealing face of disc and seat is still line contact, the seal performance is achieved by elastic deformation of seat caused by extrusion from valve disc, so it still can’t stand very high pressure;
• The YFL double offset butterfly valve can be rubber seated or PTFE seated to achieve excellent soft seal performance.

Product range:

• Size: 2"～48" (DN50～1200)
• Pressure rating: Class 150～600 (PN10～PN00)
• End connection: Flanged Wafer Lugged BW
• Body materials: Cast iron Ductile iron WCB CF8 CF8M etc.
• Disc materials: Cast iron Ductile iron WCB CF8 CF8M etc.
• Stem materials: SS410 F304 F316 etc.
• Seat materials: WCB+13Cr SS304 SS316 etc.
• Seal ring: NBR EPDM PTFE RPTFE 304+graphite 316+graphite etc.
• Operation: Bare stem lever gearbox and handwheel electric pneumatic.

Technical standards:

• Design: ASME B16.34 DIN 3840
• Face to Face: API 609 ASME B16.10 ISO5752
• BW ends: ASME B16.25 ASME B31.8 EN12627
• Flanged ends: ASME B16.5 ASME B16.47 EN1092
• ISO top flange: ISO5211
• Materials: NACE MR 01-75
• Wall thickness: ASME B16.34
• Test and inspection: API 598
• Fireproof test: API 607 API 6FA
• Pressure and temperature rating: API609 ASME B16.34