217 LAB COCK COMPACT BALL VALVE TYPE 27 APPENDICES 0 50 100 Cv VALUE (%) OPENING DEGREE (%) 0 10 20 30 40 50 60 70 80 90 100 0 50 100 Cv VALUE (%) OPENING DEGREE (%) 0 10 20 30 40 50 60 70 80 90 100 13 mm . 50 mm Cv VALUE FOR EACH OPENING DEGREE mm . 15 . inch 1/4 1/2 3/8 FULL-OPEN Cv VALUE 1.6 FULL-OPEN Cv VALUE mm 13 15 20 25 32 inch 3/8 1/2 3/4 1 1 1/4 FULL-OPEN Cv VALUE 7.7 14 29 47 72 mm 40 50 inch 1 1/2 2 FULL-OPEN Cv VALUE 155 190 FULL-OPEN Cv VALUE BUTTERFLY VALVE TYPE 57, TYPE 56, TYPE 75 / LUG BUTTERFLY VALVE TYPE 57L / BUTTERFLY VALVE TYPE 55, TYPE 55IS FULL-OPEN Cv VALUE mm 40 50 65 80 100 125 150 200 250 300 350 400 450 500 600 inch 1 1/2 2 2 1/2 3 4 5 6 8 10 12 14 16 18 20 24 FULLOPEN Cv VALUE BUTTERFLY VALVE TYPE 57 71 120 250 300 470 830 1,100 2,500 3,860 5,700 6,440 . . . . BUTTERFLY VALVE TYPE 56 . . . . . . . . . . . 8,340 . . . BUTTERFLY VALVE TYPE 75 . . . . . . . . . . . . 10,890 14,060 18,500 LUG BUTTERFLY VALVE TYPE 57L . . . 300 470 830 1,100 2,500 . . . . . . . BUTTERFLY VALVE TYPE 55, TYPE 55IS . 100 . 285 600 940 1,500 2,500 4,200 . . . . . . 0 50 100 Cv VALUE (%) OPENING DEGREE (%) 0 10 20 30 40 50 60 70 80 90 100 0 50 100 Cv VALUE (%) OPENING DEGREE (%) 0 10 20 30 40 50 60 70 80 90 100 0 50 100 Cv VALUE (%) OPENING DEGREE (%) 0 10 20 30 40 50 60 70 80 90 100 BUTTERFLY VALVE TYPE 57: 40 mm . 350 mm LUG BUTTERFLY VALVE TYPE 57L: 80 mm . 150 mm BUTTERFLY VALVE TYPE 56: 400 mm BUTTERFLY VALVE TYPE 75: 450 mm . 600 mm BUTTERFLY VALVE TYPE 55, TYPE 55IS: 50 mm . 250 mm