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ASME Section VIII Water - US gallons per minute @ 10%
overpressure. NATIONAL BOARD CERTIFIED.
Set
Pressure
psig
Orice
D E F G H J
15 14 25 40 65 102 167
20 16 29 45 74 115 189
25 18 32 50 82 127 208
30 19 34 54 89 138 226
35 21 37 58 96 149 244
40 22 40 62 102 160 261
45 24 42 66 108 169 277
50 25 44 70 114 178 292
55 26 46 73 120 187 306
60 28 48 76 125 195 320
65 29 50 79 130 203 333
70 30 52 82 135 211 345
75 31 54 85 140 218 357
80 32 56 88 145 226 369
85 33 58 91 149 233 381
90 34 59 93 153 239 392
95 35 61 96 158 246 402
100 36 63 98 162 252 413
125 40 70 110 181 282 462
150 44 77 121 198 309 506
175 47 83 130 214 334 546
200 50 89 139 229 357 584
225 53 94 148 242 378 619
250 56 99 156 256 399 653
275 59 104 163 268 418 685
300 62 108 171 280 437 715
325 64 113 178 291 455 744
350 66 117 184 302 472 772
375 69 121 191 313 489 799
400 71 125 197 323 505 826
425 73 129 203 333 520 851
450 75 133 209 343 535 876
475 77 136 215 352 550 900
500 79 140 220 361 564 923
525 81 143 226 370
550 83 147 231 379
575 85 150 236 388
600 87 153 241 396
625 89 157
650 91 160
675 92 163
700 94 166
725 96 169
750 97 171
775 99 174
800 100 177
825 102 180
850 104 183
875 105 185
900 107 188
950 109
1000 112
Note: To determine water capacity at 25% overpressure, multiply the
capacity at 10% above by 1.066.
500 SERIES CONT.
ASME SECTION VIII SAFETY RELIEF VALVES
Pressure and Temperature Ratings
Series
Body
Trim
510
Bronze
Brass
520
Bronze
Stainless
530
Carbon
Steel
Stainless
540
Stainless
Steel
Stainless
Max.
Set-Steam
250 PSI 300 PSI
900 PSI (D/E)
600 PSI (F/G)
500 PSI (H/J)
900 PSI (D/E)
600 PSI (F/G)
500 PSI (H/J)
Max.
Set-Air/
Gas/Liquid
300 PSI
1200 PSI (D)
1
900 PSI
(E)
600 PSI (F/G)
500 PSI (H/J)
1200 PSI (D)
1
900 PSI
(E)
600 PSI (F/G)
500 PSI (H/J)
1200 PSI (D)
1
900 PSI
(E)
600 PSI (F/G)
500 PSI (H/J)
Temp. Limits* -320/406˚F -320/422˚F -20/800˚F -320/800˚F
1
Max set pressure for liquids is 1000 psi.
Notes:
• Limits based upon materials of construction
and use of metal to metal seating. Refer to 500
series soft seat chart for limitations based upon
elastomer.
• Specify “HT” high temperature Inconel springs
for service temperature beyond 550˚F.
* Models 510, 520 and 540 are suitable for
cryogenic service to -320˚F, with choice of either
“M” metal or “K” PCTFE seat options.
SAFETY RELIEF VALVES