• Center line structure, bidirectional seal and no installation direction requirement;
• Upper and lower double half shafts, disc without pin, non-backed replaceable seat with good performance and longer service life;
• One through shaft, disc with or without pin, backed seat or non-backed seat;
• Simple structure, small volume, light in weight, small installation space, quick open or close, small operate torque, small fluid resistance, suitable for large size pipeline, excellent regulating performance, good seal performance;
• Square and short neck is easy for fixing nameplate and cost saving;
• Easy installation and maintenance, no flanges and gaskets needed;
• The YFL lugged concentric butterfly valve has good seal performance of vulcanized seat, boding firm, good elasticity and low torque;
• The YFL lugged center line butterfly valves with rubber coated disc and body are abrasion resistant;
• Fluorine lined disc and body are corrosive resistant;
• Full PTFE coated for corrosive medium like hydrofluoric acid, phosphoric acid, alkali chlorine etc.;
• Extended bonnet or extended stem is available for underground installation;
• Aluminum bronze butterfly valve is suitable for sea water.

Product range:

• Size: 1"～24" (DN25～600)
• Pressure rating: PN10～PN16
• End connection: Lugged
• Body materials:  cast iron GG25 ductile iron GGG40 GGG50 stainless steel CF8 CF8M Duplex 904L Aluminum bronze C95800 etc.;
• Disc materials: GGG40 GGG50 CF8 CF8M 904L Aluminum bronze etc.
• Stem materials: stainless steel SS410 SS416 SS420 SS304 SS316 etc.
• Seat materials: EPDM NBR WRAS-EPDM VITON Silicon PTFE Hyplon etc.
• Operation: Bare stem lever gearbox and handwheel electric pneumatic.

Technical standards:

• Design: API 609
• Face to Face: API 609 EN558-1 20 Series BS5155 DIN3202 K1
• End flange standard: DIN PN10/PN16 ANSI 125#/150# BS4504 PN10/ PN16 JIS B2220 10K
• Top flange standard: ISO 5211
• Test and inspection: API 598