193 1. 3 TABLE Cv VALUE OF "ASAHI AV VALVE" FULLY OPEN Valve Nominal Size mm (inch) 13[10] (3/8) 15 (1/2) 20 (3/4) 25 (1) 30[32] (11/4) 40 (11/2) 50 (2) 65 (21/2) 80 (3) 100 (4) 125 (5) 150 (6) 200 (8) 250 (10) 300 (12) 350 (14) 400 (16) 450 (18) 500 (20) 600 (24) DIAPHRAGM VALVE TYPE 72 and 15 300 400 700 1000 DIAPHRAGM VALVE TYPE 14 4.8 5.3 8.5 11 26 43 85 115 185 BALL VALVE TYPE 21 7.7 14 29 47 72 155 190 365 410 680 3-WAY BALL VALVE (L-port) 7.4 10 23 43 59 130 260 3-WAY BALL VALVE (Double-L-port) 6.3 8.5 20 36 45 99 200 3-WAY BALL VALVE (Closs-port) 7.8 13 23 65 98 COMPACT BALL VALVE 7.7 14 29 47 72 140 185 410 BUTTERFLY VALVE TYPE 57, 56 and 75 71 120 250 300 470 830 1100 2500 3860 5700 6440 8340 10890 14060 18500 BUTTERFLY VALVE TYPE 57L (Lug Style) 300 470 1100 BUTTERFLY VALVE TYPE 55 100 285 600 940 1500 2500 4200 STOP VALVE "GLOVE VALVE" 4.1 6.4 9.7 18 22 29 57 78 115 STOP VALVE "GLOVE VALVE"(needle type) 3.3 5.2 7.5 19 28 58 85 109 GATE VALVE (P-type) 130 180 415 470 690 1000 1400 2900 3700 5200 7000 GATE VALVE (S-type) 130 180 415 470 690 1000 1400 2900 3700 BALL CHECK VALVE 6.5 17 25 86 130 280 500 SWING CHECK VALVE 14 24 81 140 250 280 510 750 1100 1900 STRAINER (Y) 5.2 7.5 14 34 50 110 165 BALL FOOT VALVE 6.5 17 25 86 130 280 500 Valve Nominal Size (mm) 1/4, 1/2, 3/8 15 (6mm) 15 (15mm) 20 (6mm) 20 (15mm) 25 (6mm) 25 (15mm) LAB COCK 1.6 − − − − − − NEEDLE VALVE − 0.7 4.5 0.7 4.5 0.7 6 PDCPD BUTTERFLY VALVE Valve (inch) 700(28) 800(32) 900(36) 1,000(40) 1,100(44) 1,200(48) Cv Value 32,000 43,000 55,000 70,000 86,000 100,000