Data Sheet
Bulletin 71.4:MR98
28
Table 15. Air Relief Capacities in SCFH / Nm
3
/h, Types MR98H and MR98HD with Elastomer 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 1200 32.2 1500 39.8 1900 51.3 2200 59.3 2500 67.2
25 1.7 1500 40.7 1900 49.7 2400 63.1 2700 72.4 3000 81.7
35 2.4 1600 42.4 2000 54.6 2700 72.9 3100 83.4 3500 93.8
25 to 75 1.7 to 5.2 Green
35 2.4 1200 31.4 1600 44.2 2400 63.4 2900 77.8 3400 92.2
50 3.4 1300 33.8 1900 50.2 2800 74.9 3400 92.4 4100 110
75 5.2 1800 47.5 2500 66.8 3600 95.7 4400 118 5200 141
70 to 140 4.8 to 9.7 Red
75 5.2 1400 36.3 1800 48.2 2500 66.2 3500 92.7 4400 119
100 6.9 1600 42.3 2100 56 2900 76.6 4100 109 5300 141
125 8.6 1900 51 2400 65.7 3300 87.6 4500 122 5800 155
130 to 200 9.0 to 13.8 Blue
150 10.3 1900 51.2 2400 64.3 3100 84.1 4300 115 5400 146
175 12.1 2100 56.6 2700 71.9 3500 94.8 4400 118 5300 142
200 13.8 2500 66.6 3100 82.2 3900 106 4800 129 5700 153
1/2 / 15
15 to 35 1.0 to 2.4 Yellow
15 1.0 2400 64.5 3300 87.8 4600 123 5400 145 6300 168
25 1.7 3100 82.8 4100 110 5700 152 6600 176 7500 200
35 2.4 3700 98 4900 132 6800 182 7800 209 8800 235
25 to 75 1.7 to 5.2 Green
35 2.4 2500 68.4 3700 98.5 5400 144 6800 183 8300 222
50 3.4 3200 86.6 4600 122 6600 176 8300 222 10,000 269
75 5.2 4200 114 5700 152 7900 211 10,000 279 13,000 346
70 to 140 4.8 to 9.7 Red
75 5.2 3600 97.5 4900 131 6700 181 9400 251 12,000 322
100 6.9 4500 121 6000 161 8300 222 11,000 308 15,000 394
125 8.6 5200 140 6900 185 9400 251 13,000 349 17,000 446
130 to 200 9.0 to 13.8 Blue
150 10.3 4000 107 4800 130 6100 164 8400 226 11,000 287
175 12.1 4400 117 5300 143 6800 182 9300 248 12,000 315
200 13.8 5500 147 6600 176 8200 220 11,000 298 14,000 376
3/4 and 1 /
20 and 25
15 to 35 1.0 to 2.4 Yellow
15 1.0 5700 153 6900 185 8700 233 10,000 276 12,000 320
25 1.7 7100 191 8800 235 11,000 300 13,000 340 14,000 379
35 2.4 8500 228 10,000 277 13,000 351 15,000 401 17,000 451
25 to 75 1.7 to 5.2
Green
35 2.4 6500 173 8500 227 11,000 307 14,000 374 16,000 441
50 3.4 7600 203 10,000 269 14,000 367 17,000 446 20,000 526
75 5.2 9000 241 12,000 327 17,000 456 21,000 558 25,000 661
70 to 140 4.8 to 9.7 Red
75 5.2 8000 215 10,000 276 14,000 368 18,000 494 23,000 620
100 6.9 9900 264 13,000 340 17,000 453 22,000 597 28,000 741
125 8.6 12,000 314 15,000 405 20,000 542 26,000 708 33,000 873
130 to 200 9.0 to 13.8 Blue
150 10.3 8700 232 11,000 286 14,000 368 19,000 515 25,000 662
175 12.1 10,000 280 13,000 349 17,000 452 23,000 620 29,000 789
200 13.8 7100 191 10,000 279 15,000 410 22,000 603 30,000 795
1-1/2 and 2 /
40 and 50
5 to 35 0.34 to 2.4 Dark gray
5 0.34 7900 212 12,000 311 17,000 460 22,000 596 27,000 733
10 0.69 12,000 323 16,000 421 21,000 569 26,000 706 31,000 844
15 1.0 16,000 428 19,000 515 24,000 644 30,000 792 35,000 939
25 1.7 20,000 534 23,000 626 29,000 765 35,000 940 42,000 1110
35 2.4 22,000 583 27,000 730 35,000 950 42,000 1130 49,000 1310
20 to 65 1.4 to 4.5
Black with
light blue
stripe
25 1.7 13,000 362 18,000 472 24,000 636 31,000 829 38,000 1020
35 2.4 17,000 442 21,000 569 28,000 759 36,000 961 43,000 1160
50 3.4 22,000 579 28,000 756 38,000 1020 47,000 1250 55,000 1470
65 4.5 23,000 620 31,000 840 44,000 1170 53,000 1420 62,000 1660
50 to 100 3.4 to 6.9 Light gray
50 3.4 15,000 399 21,000 555 29,000 789 40,000 1060 50,000 1340
75 5.2 20,000 536 27,000 711 36,000 973 50,000 1340 64,000 1710
100 6.9 26,000 698 34,000 915 46,000 1240 63,000 1680 79,000 2120
75 to 170 5.2 to 11.7 Black
75 5.2 15,000 404 19,000 507 25,000 661 36,000 959 47,000 1260
100 6.9 20,000 524 24,000 650 31,000 840 46,000 1220 60,000 1610
125 8.6 25,000 672 31,000 830 40,000 1070 56,000 1490 72,000 1920
170 11.7 30,000 814 39,000 1040 51,000 1380 71,000 1900 90,000 2420
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