North American Steam Pressure Regulators
Sheet 7447-1
7447 Steam Pressure Regulators deliver steam at a selected controlled pressure between 20 and 150 psi by adjusting a pilot adjusting screw. These full-ported, pilot-operated regulators are iron with stainless steel seats and phosphor bronze diaphragms. Maximum pressure is 250 psi, maximum temperature, 450°F. 7447 Regulators maintain outlet pressure within 10% (2 psi minimum) of setting, and control flow down to 5% of table capacity. 7447 Steam Pressure Regulators have integral pilots. Standard outlet pressure range is 20-150 psi. Optional pilot regulator springs are available for outlet ranges of 3-20 psi, 5-50 psi, and 10-100 psi.
Sizing. From Table 1, select a regulator with desired steam capacity for the specified inlet and outlet steam pressures. Minimum allowable pressure drop across the regulator is 10 psi. The lowest outlet pressure listed for each inlet pressure (marked ‡) is that pressure below which no further increase in capacity can be obtained .
Table 1 Capacities 10 psi min. pressure drop flow of saturated steam, lb/hr
pressure, psi
Regulator size
inlet
outlet
-01 ( ½ ")
-0 ( ¾ ")
-1 (-1")
-2 (1 ¼ ")
-3 (1 ½ ")
-4 (2")
55 50 45
330 370 400 420 420 520 560 470 640 680 520 700 800 560 770 900 920 820 980 1040
560 610 660 700 710 870 930 790 1060 1140 870 1180 1340 940 1280 1510 1540 1380 1620 1750
980 1090 1180 1240 1250 1530 1640 1390 1880 1990 1530 2070 2370 1650 2280 2660 2750 2370 2850 3040
1520 1670 1800 1910 1920 2370 2470 2180 2850 3040 2370 3180 3610 2560 3420 4080 4180 3700 4370 4750
2180 2370 2560 2750 2750 3320 3610 3040 4080 4370 3310 4520 5130 3610 4940 5800 5900 5320 6260 6650
3420 3700 3980 4270 4270 5220 5600 4750 6350 6840 5230 7070 7970 5600 7700 9020 9200 8260 9780 10450
75
40‡
75 60
100
50‡
100
125
75
65‡
125 100 80‡ 150 125 100 95‡ 150 125 110‡
150
175
200
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