Our online catalog is being updated! Please contact us for current pricing. Butterfly Valves Features 1/4 turn fully open/fully closed Viton O-ring main seal Leak free to 2 x 10-10 std cc/sec, vacuum adverse 304 stainless steel, vacuum melt bar stock main body Most advanced, patented design Options Available with alternate elastomer seals Available with O-ring or bellows shaft seals Dimensions given are in inches Nom. O.D. Nom. I.D. Flange Type A B C D Model No. Price 1.33 0.75 ConFlat Consult Factory BFV-133 $285 2.75 1.50 ConFlat 4.00 2.73 1.38 1.25 BFV-275 $285 3.38 2.00 ConFlat Consult Factory BFV-338 $415 ISO 16 0.75 ISO/KF Consult Factory BFV-16K $285 ISO 25 1.00 ISO/KF Consult Factory BFV-25K $285 ISO 40 1.50 ISO/KF Consult Factory BFV-40K $350 ISO 50 2.00 ISO/KF Consult Factory BFV-50K $400