Data Sheet
Bulletin 71.4:MR98
30
Table 16. Air Relief Capacities in SCFH / Nm
3
/h, Types MR98H and MR98HD with Metal Diaphragm
NOMINAL
BODY SIZE,
In. / DN
SPRING RELIEF
PRESSURE RANGE
COLOR
CODE
RELIEF
PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
5 / 0.34 15 / 1.0 20 / 1.4
psi bar psig bar SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h SCFH Nm
3
/h
1/4 NPT
15 to 35 1.0 to 2.4 Yellow
15 1.0 510 13.7 730 19.5 1100 28.3 1600 42.6 2100 56.9
25 1.7 600 16.1 840 22.5 1200 32.2 1800 48.7 2400 65.3
35 2.4 710 19.1 970 25.9 1300 36.1 2000 54.4 2700 72.8
25 to 75 1.7 to 5.2 Green
35 2.4 660 17.7 880 23.7 1200 32.7 1800 48.8 2400 65
50 3.4 790 21.1 1000 27.4 1400 36.9 2000 53.7 2600 70.6
75 5.2 980 26.3 1200 33.2 1600 43.7 2300 61.6 3000 79.5
70 to 140 4.8 to 9.7 Red
75 5.2 810 21.7 1000 26.9 1300 34.8 1800 49.5 2400 64.3
100 6.9 980 26.3 1200 32.5 1600 41.7 2100 57.5 2700 73.4
125 8.6 1100 30.1 1400 36.6 1700 46.3 2400 63.8 3000 81.4
130 to 200 9.0 to 13.8 Blue
150 10.3 1300 34.4 1500 40.3 1800 49.1 3100 82.3 4300 115
175 12.1 1400 37.7 1700 44.3 2000 54.2 3300 88.9 4600 124
200 13.8 1600 42.5 1800 49.1 2200 59 3600 95.3 4900 132
1/2 / 15
15 to 35 1.0 to 2.4 Yellow
15 1.0 530 14.2 1500 39 2800 76.2 4000 107 5100 138
25 1.7 1100 28.9 2100 55.8 3600 96.2 4900 130 6100 165
35 2.4 1500 39.7 2400 65.1 3800 103 5400 144 6900 184
25 to 75 1.7 to 5.2 Green
35 2.4 830 22.2 1300 34.2 1900 52.2 3400 92.4 4900 132
50 3.4 1400 37.6 1900 52.1 2800 73.9 4200 112 5600 150
75 5.2 1800 48.9 2300 61.8 3000 81.1 4500 122 6000 162
70 to 140 4.8 to 9.7 Red
75 5.2 1700 44.9 2100 55.4 2700 71.3 4000 107 5300 142
100 6.9 2000 53.9 2400 64.8 3000 81.2 4300 116 5700 152
125 8.6 2300 61.9 2800 74.1 3400 92.4 4700 126 6000 160
130 to 200 9.0 to 13.8 Blue
150 10.3 2800 74.4 3100 84.4 3700 99.3 4700 127 5700 154
175 12.1 3100 84.2 3500 94.7 4100 111 5200 140 6300 169
200 13.8 3400 91.3 3800 102 4400 118 5600 149 6700 180
3/4 and 1 /
20 and 25
15 to 35 1.0 to 2.4 Yellow
15 1.0 3600 97.9 4600 123 6000 160 7400 199 8900 239
25 1.7 3800 101 4800 129 6400 173 8400 224 10,000 276
35 2.4 4300 116 5400 145 7000 188 9300 249 12,000 310
25 to 75 1.7 to 5.2 Green
35 2.4 3400 90.5 4500 120 6100 163 8200 221 10,000 278
50 3.4 3600 97.4 4700 127 6400 172 8900 237 11,000 303
75 5.2 4600 124 5700 153 7400 197 10,000 275 13,000 352
70 to 140 4.8 to 9.7 Red
75 5.2 3900 104 5000 133 6600 176 9000 241 11,000 306
100 6.9 4800 128 5900 158 7500 202 10,000 276 13,000 351
125 8.6 5200 139 6300 169 8000 214 11,000 292 14,000 371
130 to 200 9.0 to 13.8 Blue
150 10.3 6300 169 7300 196 8800 237 12,000 309 14,000 381
175 12.1 7300 194 8300 223 9900 265 13,000 349 16,000 433
200 13.8 8000 213 9100 244 11,000 289 14,000 370 17,000 450
1-1/2 and 2 /
40 and 50
5 to 35 0.34 to 2.4 Dark gray
5 0.34 7100 191 9500 253 13,000 348 17,000 461 21,000 574
10 0.69 11,000 304 14,000 374 18,000 478 22,000 577 25,000 676
15 1.0 12,000 330 15,000 395 18,000 493 23,000 624 28,000 754
25 1.7 16,000 418 19,000 499 23,000 621 28,000 756 33,000 891
35 2.4 18,000 479 21,000 570 26,000 705 32,000 869 39,000 1030
20 to 65 1.4 to 4.5
Black with
light blue
stripe
25 1.7 11,000 307 14,000 374 18,000 475 23,000 624 29,000 773
35 2.4 13,000 357 17,000 452 22,000 595 28,000 760 35,000 925
50 3.4 15,000 406 19,000 503 24,000 650 31,000 843 39,000 1040
65 4.5 17,000 464 21,000 561 26,000 707 35,000 936 43,000 1170
50 to 100 3.4 to 6.9 Light gray
50 3.4 11,000 297 14,000 372 18,000 484 25,000 670 32,000 855
75 5.2 16,000 425 19,000 518 24,000 656 33,000 895 42,000 1130
100 6.9 20,000 536 24,000 642 30,000 800 39,000 1040 48,000 1290
75 to 170 5.2 to 11.7 Black
75 5.2 12,000 333 15,000 390 18,000 476 24,000 650 31,000 825
100 6.9 17,000 451 20,000 532 24,000 655 32,000 857 39,000 1060
125 8.6 19,000 522 23,000 628 29,000 786 38,000 1020 46,000 1250
170 11.7 26,000 695 30,000 817 37,000 1000 47,000 1270 57,000 1540
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