Data Sheet

Bulletin 71.4:MR98
33
Table 18. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Metal Diaphragm
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 3.2 12.1 4.8 18.2 6.2 23.3 7.5 28.4 8.7 32.7
175 12.1 3.5 13.2 4.9 18.5 6.4 24 7.8 29.5 8.9 33.5
200 13.8 3.6 13.6 5.2 19.7 6.5 24.6 7.8 29.5 8.9 33.7
250 17.2 4.2 15.9 5.3 20 6.6 25 7.9 29.9 9.1 34.4
300 20.7 4.6 17.4 5.6 21.2 6.8 25.7 8 30.3 9.3 35
375 25.9 5.4 20.4 6 22.7 7.1 26.9 8.2 31 9.56 36.2
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 5.72 21.6 7.32 27.7 8.22 31.1 9.16 34.6 10.6 39.9
175 12.1 6.05 22.9 7.81 29.5 8.81 33.3 9.85 37.3 11.3 42.7
200 13.8 6.44 24.3 8.25 31.2 9.31 35.2 10.4 39.4 12 45.3
250 17.2 6.7 25.3 8.69 32.9 9.86 37.3 11.1 41.8 12.6 47.7
300 20.7 7 26.5 9 34 10.5 39.7 12 45.4 14 53
375 25.9 8 30.3 9.5 35.9 11.5 43.5 13.5 51.1 15.8 59.7
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 12 45.4 17 64.3 20.3 76.6 23.5 88.9 26.8 101
175 12.1 12.8 48.4 16.5 62.4 20.5 77.4 24.4 92.3 27.6 104
200 13.8 13.1 49.6 17 64.3 20.8 78.5 24.5 92.7 27.9 106
250 17.2 15.3 57.9 18.7 70.7 22.5 84.9 26.2 99.1 29.8 113
300 20.7 14.9 56.4 19.2 72.6 23.2 87.8 27.2 103 31.4 119
375 25.9 15.6 59 19.3 73 23.4 88.5 27.5 104 33.6 127
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 9.8 37.1 10.7 40.3 11.5 43.5 13.2 49.9 15.4 58.1 17.5 66.2
175 12.1 9.9 37.5 10.9 41 11.8 44.6 13.7 51.8 16 60.3 18.2 68.9
200 13.8 10 37.8 11 41.4 11.9 45 13.8 52.2 16.3 61.5 18.7 70.7
250 17.2 10.3 39 11.3 42.6 12.2 46.2 14.1 53.3 17.1 64.5 20 75.7
300 20.7 10.5 39.7 11.5 43.4 12.5 47.1 14.4 54.5 17.7 67 21 79.4
375 25.9
1/2 / 15
150 to
375
10.3 to
25.9
150 10.3 12 45.2 12.9 48.8 14.2 53.7 17.2 65.3 22.6 85.5 30.6 116
175 12.1 12.7 48.2 13.7 51.8 15 56.8 18.1 68.6 23.6 89.3 31.3 118
200 13.8 13.5 51.2 14.5 54.8 15.8 59.8 18.9 71.7 24.1 91.3 31.5 119
250 17.2 14.2 53.7 15.3 58 16.9 63.8 20.5 77.7 25.8 97.8 32.3 122
300 20.7 16 60.5 17.5 66.2 19 71.9 22 83.2 28 106 34 129
375 25.9
3/4 and 1 /
20 and 25
150 to
375
10.3 to
25.9
150 10.3 30 113 32.9 124 35.7 135 41.4 157 51.7 196 62 235
175 12.1 30.7 116 33.8 128 36.9 140 43.1 163 53.7 203 64.2 243
200 13.8 31.3 118 34.5 130 37.7 142 44 166 55.1 208 66.1 250
250 17.2 33.3 126 36.5 138 39.6 150 45.9 174 57.6 218 69.3 262
300 20.7 35.5 134 39.1 148 42.8 162 50 189 65.5 248 81 306
375 25.9
- Shaded areas show where maximum inlet pressures are exceeded.
- continued -
Table 18. Water Relief Capacities in Gallons per Minute / L/min, Types MR98HH and MR98HHD with Metal Diaphragm (continued)