Data Sheet

Bulletin 71.4:MR98
12
- continued -
Table 7. Water Relief Capacities in Gallons per Minute / L/min, Types MR98L and MR98LD 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
2 / 0.14 4 / 0.28  8 / 0.55 
psi bar psig bar GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min
1/4 NPT
2 to 7 0.14 to 0.48 Yellow
2 0.14 2.4 9.08 3 11.3 3.6 13.6 4.1 15.3 4.5 17
5 0.34 3.2 12.1 3.8 14.2 4.3 16.3 4.8 18 5.2 19.7
6 to 14 0.41 to 0.97 Green 10 0.69 3.8 14.4 4.6 17.4 5.4 20.4 5.6 21.2 5.8 21.9
12 to 25 0.83 to 1.7 Red
15 1.0 3.1 11.7 4.4 16.5 5.6 21.2 6 22.7 6.4 24.2
20 1.4 3.3 12.5 4.6 17.4 5.9 22.3 6.6 24.8 7.2 27.2
25 1.7 3.4 12.9 4.8 18.2 6.2 23.5 6.9 26.1 7.6 28.8
20 to 38 1.4 to 2.6 Blue
25 1.7 3.3 12.5 4.7 17.8 6.1 23.1 6.8 25.7 7.5 28.4
30 2.1 3.3 12.5 4.8 18.2 6.3 23.8 7.1 26.9 7.9 29.9
35 2.4 3.6 13.6 5.1 19.3 6.6 25 7.4 28 8.2 31
1/2 / 15
2 to 7 0.14 to 0.48 Yellow
2 0.14 6 22.7 7.4 27.8 8.7 32.9 9.9 37.3 11 41.6
5 0.34 8.3 31.4 9.4 35.4 10 39.3 11 42.7 12 46.2
6 to 14 0.41 to 0.97 Green 10 0.69 9.1 34.4 11 41.6 13 48.8 14 51.6 14 54.5
12 to 25 0.83 to 1.7 Red
15 1.0 8.3 31.4 11 42.2 14 53 15 58.1 17 63.2
20 1.4 9 34 12 46.7 16 59.4 17 63.9 18 68.5
25 1.7 9.3 35.2 13 49.2 17 63.2 18 68.3 19 73.4
20 to 38 1.4 to 2.6 Blue
25 1.7 5.5 20.8 8.9 33.5 12 46.2 14 53.7 16 61.3
30 2.1 5.8 21.9 9.4 35.6 13 49.2 15 57.1 17 65.1
35 2.4 6.6 25 10 38.6 14 52.2 16 60.1 18 68.1
3/4 and 1 /
20 and 25
2 to 7 0.14 to 0.48 Yellow
2 0.14 11 41.6 14 52.6 17 63.6 19 70.9 21 78.3
5 0.34 15 56.7 18 66.4 20 76 22 83 24 90
6 to 14 0.41 to 0.97 Green 10 0.69 17 62.4 21 77.9 25 93.4 26 99.1 28 105
12 to 25 0.83 to 1.7 Red
15 1.0 15 57.1 20 77.2 26 97.2 28 107 31 116
20 1.4 17 64.3 23 85.5 28 107 31 117 34 127
25 1.7 19 71.9 25 93.6 31 115 33 125 36 135
20 to 38 1.4 to 2.6 Blue
25 1.7 14 52.6 20 76 26 99.5 30 112 33 125
30 2.1 15 56.4 21 80.8 28 105 31 119 35 132
35 2.4 16 60.9 23 86.3 30 112 33 126 37 140
Table 6. Maximum Cold Working Pressures of Body Size and Materials
(1)(2)
TYPE BODY SIZE
BODY AND SPRING
CASE MATERIAL
MAXIMUM INLET PRESSURE
(3)
MAXIMUM OUTLET PRESSURE
MAXIMUM SPRING CASE
PRESSURE
psig bar psig bar psig bar
MR98L All Sizes
Gray Cast Iron
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
60
150
150
150
150
4.1
10.3
10.3
10.3
10.3
60
150
150
150
150
4.1
10.3
10.3
10.3
10.3
50
125
125
125
125
3.4
8.6
8.6
8.6
8.6
MR98LD All Sizes
Gray Cast Iron
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
60
150
150
150
150
4.1
10.3
10.3
10.3
10.3
60
150
150
150
150
4.1
10.3
10.3
10.3
10.3
50
125
125
125
125
3.4
8.6
8.6
8.6
8.6
MR98H All Sizes
Gray Cast Iron
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
Aluminum-Bronze
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
250
300
300
300
300
300
17.2
20.7
20.7
20.7
20.7
20.7
MR98HD All Sizes
Gray Cast Iron
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
Aluminum-Bronze
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
250
300
300
300
300
300
17.2
20.7
20.7
20.7
20.7
20.7
MR98HH All Sizes
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
Aluminum-Bronze
400
400
400
400
400
27.6
27.6
27.6
27.6
27.6
400
400
400
400
400
27.6
27.6
27.6
27.6
27.6
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
MR98HHD All Sizes
Steel
Stainless Steel
Monel
®
Hastelloy
®
C
Aluminum-Bronze
400
400
400
400
400
27.6
27.6
27.6
27.6
27.6
400
400
400
400
400
27.6
27.6
27.6
27.6
27.6
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
1. The pressure/temperature limits in this Bulletin and any applicable standard limitation should not be exceeded.
2. Temperature, trim material, and/or the body end connection may decrease these maximum pressures.
3. Maximum inlet pressure equals set pressure plus build-up.
Monel
®
is a mark owned by Special Metals Corporation.
Hastelloy
®
C is a mark owned by Haynes International, Inc.