Data Sheet

Bulletin 71.4:MR98
32
NOMINAL
BODY
SIZE,
In. / DN
SPRING RELIEF
PRESSURE RANGE
RELIEF PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
30 / 2.1 35 / 2.4 40 / 2.8 50 / 3.4  
psi bar psig bar GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 14.7 55.6 15.5 58.4 16.2 61.3 17.7 67 19.2 72.6 20.7 78.3
175 12.1 15.7 59.4 16.4 62.1 17.2 64.9 18.6 70.4 20.2 76.4 21.8 82.5
200 13.8 16.7 63.2 17.5 66.2 18.3 69.2 19.9 75.3 21.4 80.8 22.8 86.3
250 17.2 18.1 68.5 18.7 70.8 19.4 73.2 20.6 77.9 21.8 82.5 23 87
300 20.7 19.9 75.3 20.5 77.6 21.1 79.8 22.3 84.4 23.4 88.3 24.4 92.3
375 25.9
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 27.8 105 30 114 32.3 122 36.7 139 42.7 161 48.6 184
175 12.1 29.6 112 31.9 120 34.1 129 38.6 146 44.6 169 50.5 191
200 13.8 31.5 119 33.7 127 35.9 136 40.3 152 46.4 176 52.5 199
250 17.2 33 125 35.7 135 38.4 145 43.7 165 49.7 188 55.7 211
300 20.7 38 144 40.3 152 42.5 161 47 178 53 200 59 223
375 25.9
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 48.9 185 53.6 203 58.3 221 67.7 256 79.3 300 90.9 344
175 12.1 52.3 198 57 216 61.8 234 71.2 269 82.9 313 94.5 357
200 13.8 53.9 204 59.1 223 64.3 243 74.6 282 86.6 328 98.6 373
250 17.2 59.2 224 64.5 244 69.7 264 80.2 303 93 352 106 400
300 20.7 64.2 243 69.9 264 75.6 286 87 329 110 417 133 504
375 25.9
- Shaded areas show where maximum inlet pressures are exceeded.
Table 17. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Elastomer Diaphragm
- continued -
NOMINAL
BODY
SIZE,
In. / DN
SPRING RELIEF
PRESSURE RANGE
RELIEF PRESSURE
SETTING
PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar
5 / 0.34  15 / 1.0 20 / 1.4 
psi bar psig bar GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min
1/4 NPT
150 to
375
10.3 to
25.9
150 10.3 4.6 17.4 7.4 28 9.9 37.3 12.3 46.5 13.5 51.1
175 12.1 5.1 19.3 8.2 31 10.7 40.3 13.1 49.6 14.4 54.5
200 13.8 5.3 20 8.4 31.8 10.9 41.2 13.4 50.7 15.1 56.9
250 17.2 5.8 21.9 9.1 34.4 12 45.4 14.9 56.4 16.5 62.4
300 20.7 6.4 24.2 10 37.8 13.1 49.4 16.1 60.9 18 68.1
375 25.9 7.3 27.6 11.1 42 14.6 55 18 68.1 20.2 76.4
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 8.8 33.3 13.3 50.3 17.3 65.4 21.3 80.6 24.6 92.9
175 12.1 9.3 35.2 14.2 53.7 18.6 70.2 22.9 86.6 26.3 99.3
200 13.8 9.9 37.5 15 56.7 19.6 74.1 24.2 91.5 27.9 105
250 17.2 10.8 40.9 15.8 59.8 20.8 78.5 25.7 97.2 29.4 111
300 20.7 11 41.6 16 60.5 22 83.2 28 106 33 125
375 25.9 12 45.4 18 68.1 24 90.8 30 113 36.7 139
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 15.7 59.4 23.3 88.1 30.2 114 37.1 140 43 163
175 12.1 15.8 59.8 23.4 88.5 30.8 117 38.2 145 45.3 171
200 13.8 18 68.1 25.2 95.3 33.1 125 40.9 155 47.4 179
250 17.2 19.6 74.1 26.8 101 35.3 134 43.8 166 51.5 195
300 20.7 25 94.6 30 113 37.5 142 45 170 54.6 207
375 25.9 28.6 108 33 125 41.4 157 49.9 189 60.8 230
Table 17. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Elastomer Diaphragm (continued)