High Performance Lug Butterfly Valve

1.Body:Shall be two piece wafer or lug design with extended neck to allow for 2" piping insulation.Flange locating holes shall be provided on wafer bodies to allow for quick and precise alignment during valve installation.PTFE impregnated steel bearing shall be rovided in the upper and lower valve journal for precision alignment of the upper and lower stem.Reinforced PTFE gaskets shall be placed between body halves to eliminate potential leak path and contamination from environmental conditions.
2.Disc:Disc edge and hub on metal discs shall be spherically machined and hand polished for minimum torque and maximum sealing capability.PTFE discs shall have 1/8"(3mm) minimum thickness of pure,virgin PTFE encapsulated over the following metals:1.5"-24"(40mm-600mm) valves-PTFE encapsulated over SS316/SS304/WCB.
3.Seat:Shall be designed to reduce seating/unseating torque and reduce wear on the contacting parts.Materials shall be pure,virgin PTFE,with 1/8"(3mm)minimum thickness.

The design shall include a resilient seat energizer extending completely around the seat including the disc hub area to provide uniform force sufficient for tight shut-off.The seat shall totally encapsulate the body isolating it from the line media.

                                             Specification
Name           Material                 ASTM
Body          Ductile Iron            ASTM A536
                 Carbon Steel            A216 WCB
            
Disc          Stainless Steel         A351 CF8M
                                                 A351 CF8
                 WCB+PTFE
                 Stainless Steel+PTFE
            
Stem          Stainless Steel         A276-410
                                                   A276-304
                                                   A276-316
                                  
Seat          PTFE
        
Bushing       PTFE                   
                    Bronze                  B62

O-Ring        NBR                    
                  EPDM
                  VITON