Table 15 ALLOWABLE PRESSURE DROP RATINGS FOR 2700A PLUG CONTROL TRIM, TEFLON PACKING FLOW UP, Direct Actuators, 3 to 15 psi Spring Air Supply Pressure
Allowable Pressure Drops (PSI) Leakage Class
No 12 Direct Actuator 1.5" 2" 3" 4"
Trim Size No 16 Direct Actuator 1.5" 2" 3" 4"
1.5"
No 18 Direct Actuator 2" 3" 4" 6”
8"
II 1160 990 630 410 1980 1700 1080 700 2970 2550 1610 1060 650 300 18 IV 580 530 290 190 1000 910 500 320 1500 1370 750 480 320 90 II 1290 1100 700 460 2200 1890 1200 780 3300 2830 1790 1170 720 330 20 IV 970 890 490 310 1660 1520 840 530 2490 2280 1250 800 540 150 II 1410 1210 770 500 2420 2080 1310 860 3640 3110 1970 1290 800 360 22 IV 1360 1240 680 430 2330 2130 1170 740 3490 3200 1760 1120 750 220 II 1540 1320 840 550 2640 2260 1430 940 3970 3400 2150 1410 870 400 24 IV 1750 1600 880 560 2990 2740 1500 960 4490 4110 2260 1440 970 280 II 1740 1490 940 620 2970 2550 1610 1060 4460 3820 2420 1580 980 450 27 IV 2330 2130 1170 740 3990 3650 2010 1280 5990 5480 2260 1910 1290 370 II 1930 1650 1050 680 3300 2830 1790 1170 4960 4240 2690 1760 1090 500 30 IV 2910 2660 1460 930 4990 4570 2510 1590 5990 5480 2260 2390 1610 460 II 2120 1820 1150 750 3640 3110 1970 1290 5450 4670 2960 1940 1190 550 33 IV 3490 3200 1760 1120 5990 5480 3010 1910 5990 5480 2260 2390 1610 550 II 2250 1930 1220 800 3860 3300 2090 1370 5780 4950 3140 2050 1270 580 36 IV 3880 3550 1950 1240 6650 6090 3340 2130 5990 5480 2260 2390 2150 620 Usually direct acting actuators use a 3-15 psi spring. With an 18 psi air supply pressure, there is a 3 psi (18-15=3) net closure force on the trim, or for a 27 psi supply the net closure force is 12 psi. If a 6-30 psi spring is used in a direct acting actuator, add 15 to pressure in the air supply column.
ALLOWABLE PRESSURE DROP RATINGS FOR 2700A PLUG CONTROL TRIM, TEFLON PACKING FLOW UP, Reverse Actuators Initial * Air Pressure
Leakage Class
No 12 Direct Actuator 1.5" 2" 3" 4"
Allowable Pressure Drops (PSI) Trim Size No 16 Direct Actuator 1.5" 2" 3" 4" 1.5"
No 18 Direct Actuator 2" 3" 4" 6”
II 1160 990 630 410 1980 1700 1080 700 2970 2550 1610 1060 3 IV 580 530 290 190 1000 910 500 320 1500 1370 750 480 II 1350 1160 730 480 2310 1980 1250 820 3470 2970 1880 1230 6 IV 1160 1070 590 370 2000 1830 1000 640 2990 2740 1500 960 II 1540 1320 840 550 2640 2260 1430 940 3970 3400 2150 1410 9 IV 1750 1600 880 560 2990 2740 1500 960 4490 4110 2260 1440 II 1740 1490 940 620 2970 2550 1610 1060 4460 3820 2420 1580 12 IV 2330 2130 1170 740 3990 3650 2010 1280 5990 5480 2260 1910 The Initial air pressure is actuator diaphragm pressure when the valve begins to open. For example, a 3-15 has an initial pressure of spring may have additional compression to provide the 6, 9 & 12 psi initial pressures. //data/public/pdf/valve-sizing-maual.doc
22 of 43 10/10/2008 Norriseal – P.O. Box 40525 Houston TX 77240-052–- Ph: (713) 466-3552, Fax: (713) 896-7386
8"
650 300 320 90 760 350 650 180 870 400 970 280 980 450 1290 370 3 psi. The