VANADOUR® FLANGED BUTTERFLY VALVES Range TB 334 N Sizes DN 100 - 3300 Principle Perfect leak tightness is ensured by an interchangeable SPYRET® pressure seal gasket, peripheral to the offset butterfly disc When the valve is closed, the differential pressure compresses the gasket against the seat The retainer ring prevents extrusion of the gasket even at extreme flow velocities Special Features/Benefits Two-directional dynamic sealing / Easy maintenance, no special tooling required Low operating torque / Pressure seal gasket interchangeable on site without dismantling Materials Body and butterfly disc: ductile iron dia.150 to 3300 mm                            : steel dia. 100 to 3000 mm Upper and lower stem, seat: stainless steel Self-lubricating bearing Nitrile, EPDM or Viton® seals Internal coating: food grade epoxy External coating: bituminous epoxy Standardised base according to ISO 52 11 Dimensions according to ISO 5752 class 14 - NF E 29-430 and 31 Individual hydrostatic testing according to E 29-311 Gear operator Applications Pumping, water treatment, supply and distribution Industrial utilities / Cooling circuits / Fire main systems