b'WAFER PATTERN CHECK VALVES - ASG & AGW STYLETABLE 1 TABLE 2Class 125-150 Spring Cracking Pressure kPa (PSI) Valve Coefficient CvValve Size Std. Torque Valve Size Class 125-300mm (in) mm (in)50 (2) 1.58 (0.23) 50 (2) 7565 (2 1/2) 1.79 (0.26) 65 (2 1/2) 9580 (3) 1.45 (0.21) 80 (3) 191100 (4) 1.52 (0.22) 100 (4) 377127 (5) 1.24 (0.18) 127 (5) 483150 (6) 0.96 (0.14) 150 (6) 821200 (8) 1.31 (0.19) 200 (8) 1,590250 (10) 1.24 (0.18) 250 (10) 2,920300 (12) 1.17 (0.17) 300 (12) 4,470350 (14) 1.03 (0.15) 350 (14) 5,870400 (16) 1.10 (0.16) 400 (16) 8,690450 (18) 1.03 (0.15) 450 (18) 10,940500 (20) 0.90 (0.13) 500 (20) 14,290600 (24) 0.69 (0.10) 600 (24) 23,000750 (30) 0.55 (0.08) 750 (30) 37,200900 (36) 0.55 (0.08) 900 (36) 59,0001050 (42) 0.34 (0.05) 1050 (42) 92,0001200 (48) 0.41 (0.06) 1200 (48) 126,000Cracking pressures shown are a rough guide and valve cannot be used as a relief valve. The use of low torque springs should only be used when unique conditions are evaluated.TABLE 3Wafer Check Valve Standard APV Allowable Leakage Rates for Closure (Seat) Tests API 598VALVE SIZE METAL SEATED WAFER CHECK VALVES SOFT SEATED WAFER CHECK VALVESNB NPS LIQUID TEST (cc/min) GAS TEST (bubbles/min) LIQUID TEST (cc/min) GAS TESTa(bubbles/min)APV API 598 API 598 APV API 598 APVa API 59850 2 3 6 Not required per API598d 0c Not specifiedc 2b Not required per API598d65 2.5 3.75 7.5 Not required per API598d 0c Not specifiedc 2b Not required per API598d80 3 4.0 9 Not required per API598d 0c Not specifiedc 2b Not required per API598d100 4 6.0 12 Not required per API598d 0c Not specifiedc 2b Not required per API598d125 5 7.5 15 Not required per API598d 0c Not specifiedc 2b Not required per API598d150 6 9.0 18 Not required per API598d 0c Not specifiedc 2b Not required per API598d200 8 12.0 24 Not required per API598d 0c Not specifiedc 2b Not required per API598d250 10 15.0 30 Not required per API598d 0c Not specifiedc 3b Not required per API598d300 12 18.0 36 Not required per API598d 0c Not specifiedc 3b Not required per API598d350 14 21.0 42 Not required per API598d 0c Not specifiedc 4b Not required per API598d400 16 24.0 48 Not required per API598d 0c Not specifiedc 4b Not required per API598d450 18 27.0 54 Not required per API598d 0c Not specifiedc 5b Not required per API598d500 20 30.0 60 Not required per API598d 0c Not specifiedc 6b Not required per API598d600 24 36.0 72 Not required per API598d 0c Not specifiedc 7b Not required per API598da Gas test not performed as standard on cast iron body valves and is not required as per API 598. API598 does not require gas test on steel valves but APV performs itb 5.5 bar minimum test pressure. (Higher test pressure may be required to energise resilient seat in high pressure classes/larger sizes).c Since API 598 does not specify a leakage rate for resilient seated check valves, many manufacturers use the metal seated check valve leakage rate. However, APV demands as close as possible to tight shut off as per API 598 resilient seated (ISO 5208-A) Note in higher classes in smaller sizes and all classes in larger sizes, 3 up to 10 water drips a minute is accepted.d For check valves, gas test is not required as per API 598, but APV does perform it.1cc = 16 drops, 1ml = 16 drops12 Australian Pipeline Valve - Installation, Operation and Maintenance Manual'