800.323.0688

Series 740 Safety Relief Valves




740 Cut View
Series 740 thru 743
# Description 740 741 742 743
1 Nozzle B16 SA479-316 SS SA479-316 SS SA479-316 SS
2 Lock Screw B16 B16 SA479-316 SS SA479-316 SS
3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M
4 Disc Holder B16 B16 SA479-316 SS SA479-316 SS
5 Lock Screw 18-8 SS 18-8 SS 18-8 SS 18-8 SS
6 Disc Holder Shaft B16 B16 SA479-316 SS SA479-316 SS
7 Disc Guide B16 B16 SA479-316 SS SA479-316 SS
8 Bonnet B16 B16 SA108-1117/SA216 SA479-316 SS
9 Washer PTFE PTFE PTFE PTFE
10 Seal Wire Steel / Lead Steel / Lead Steel / Lead Stainless / Lead
11 Hood B16 B16 SA108-1018 SA479-316 SS
12 Pressure Screw B16 B16 SA479-316 SS SA479-316 SS
13 Lock Nut B16 B16 SA479-316 SS SA479-316 SS
14 Spring Plate B16 B16 SA479-316 SS SA479-316 SS
15 Spring 302/17-7 302/17-7 302/17-7 302/17-7
16 Spring Post B16 B16 SA479-316 SS SA479-316 SS
17 Spring Pin 18-8 SS 18-8 SS 18-8 SS 18-8 SS
18 Guide Washer PTFE PTFE PTFE PTFE
19 Disc SA479-316 SS SA479-316 SS SA479-316 SS SA479-316 SS
20 Body B584-C84400 B584-C84400 SA216-WCB A479-316 SS
21 Nozzle Washer PTFE PTFE PTFE PTFE
22 Nameplate Stainless Stainless Stainless Stainless
23 Washer PTFE PTFE PTFE PTFE





740 Flange Cut View
Series 742 and 743 Flange Option
# Description 742 743
1 Lap Joint Nozzle SA479-316 SS SA479-316 SS
29 Outlet Fitting SA479-316 SS SA479-316 SS
30 Lap Joint Flange CS A-105 316 Stainless
31 Lap Joint Flange CS A-105 316 Stainless

Flange






Series 740 thru 743
Orifice Flow Area
In2 (mm2)
Inlet Outlet DN Size
I.D.
Dimensions – In. (mm) Weight
Lb (Kg)
A
Closed Cap
A
Lift Lever
B C
D .125 (80.6) 1/2” 3/4” 15 C 7­˗3/8" (187) 8­˗1/8" (206) 2­˗3/8" (60) 1­˗5/8" (41) 2 (0.9)
D .125 (80.6) 1/2” 1” 15 D 7­˗3/8" (187) 8­˗1/8" (206) 2­˗3/8" (60) 1­˗5/8" (41) 2 (0.9)
D .125 (80.6) 3/4” 3/4” 20 E 7­˗3/8" (187) 8­˗1/8" (206) 2­˗3/8" (60) 1­˗5/8" (41) 2 (0.9)
D .125 (80.6) 3/4” 1” 20 F 7­˗3/8" (187) 8­˗1/8" (206) 2­˗3/8" (60) 1­˗5/8" (41) 2 (0.9)
D .125 (80.6) 1” 1” 25 G 7­˗3/8" (187) 8­˗1/8" (206) 2­˗3/8" (60) 1­˗5/8" (41) 2 (0.9)
E .217 (140.0) 1/2” 1” 15 A 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 1/2” 1-1/4” 15 B 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 3/4” 1” 20 C 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 3/4” 1-1/4” 20 D 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 1” 1” 25 G 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 1” 1-1/4” 25 F 8­˗1/8" (206) 9" (229) 2­˗5/8" (67) 2" (51) 3 (1.4)
E .217 (140.0) 1-1/4” 1-1/4” 32 H 8­˗1/8" (206) 9­˗1/4" (235) 2­˗7/8" (73) 2" (51) 3 (1.4)
F .353 (227.7) 1” 1-1/2” 25 F 9­˗1/4" (235) 9­˗5/8" (244) 2­˗7/8" (73) 2­˗1/4" (57) 5 (2.3)
F .353 (227.7) 1-1/4” 1-1/2” 32 H 9­˗1/4" (235) 9­˗5/8" (244) 2­˗7/8" (73) 2­˗1/4" (57) 5 (2.3)
F .353 (227.7) 1-1/2” 1-1/2” 40 G 9­˗1/4" (235) 9­˗5/8" (244) 2­˗7/8" (73) 2­˗1/4" (57) 5 (2.3)
G .554 (357.4) 1-1/4” 2” 32 G 10­˗1/4" (260) 10­˗5/8" (270) 3­˗3/8" (86) 2­˗5/8" (67) 9 (4.1)
G .554 (357.4) 1-1/2” 2” 40 H 10­˗1/4" (260) 10­˗5/8" (270) 3­˗3/8" (86) 2­˗5/8" (67) 9 (4.1)
G .554 (357.4) 2” 2” 50 F 10­˗1/4" (260) 10­˗5/8" (270) 3­˗3/8" (86) 2­˗5/8" (67) 9 (4.1)
H .923 (595.5) 1-1/2” 2-1/2” 40 H 11­˗3/4" (298) 12­˗1/8" (308) 3­˗1/2" (89) 2­˗7/8" (73) 16 (7.3)
H .923 (595.5) 2” 2-1/2” 50 J 11­˗3/4" (298) 12­˗1/8" (308) 3­˗1/2" (89) 2­˗7/8" (73) 16 (7.3)
H .923 (595.5) 2-1/2” 2-1/2” 65 K 11­˗3/4" (298) 12­˗1/8" (308) 3­˗1/2" (89) 2­˗7/8" (73) 16 (7.3)
J 1.418 (914.8) 2” 3” 50 J 14­˗1/4" (362) 14­˗1/2" (368) 4" (102) 3­˗1/4" (83) 18 (8.2)
J 1.418 (914.8) 2-1/2” 3” 65 K 14­˗1/4" (362) 14­˗1/2" (368) 4" (102) 3­˗1/4" (83) 18 (8.2)
J 1.418 (914.8) 3” 3” 80 L 14­˗1/4" (362) 14­˗1/2" (368) 4" (102) 3­˗1/4" (83) 18 (8.2)


Series 742 and 743 Lap Joint Flange Sizes
Orifice Flow Area
In2 (mm2)
Inlet Outlet DN Size
I.D.
Dimensions – In. (mm)
Overall Height (A) Center to Face
Closed Cap Lift Lever Inlet (B) Outlet (C)
D .125 (80.6) 1/2” 1” 15 D 9˗5/8" (244) 10˗1/4" (260) 4˗5/8" (117) 4˗1/4" (108)
D .125 (80.6) 3/4” 1” 20 F 9˗5/8" (244) 10˗1/4" (260) 4˗5/8" (117) 4˗1/4" (108)
D .125 (80.6) 1” 1” 25 G 11˗1/2" (292) 12˗1/8" (308) 6˗1/2" (165) 4˗1/4" (108)
E .217 (140.0) 3/4” 1” 20 C 10˗1/4" (260) 10˗7/8" (276) 4˗5/8" (117) 4˗1/4" (108)
E .217 (140.0) 3/4” 1-1/4” 20 D 10˗1/4" (260) 10˗7/8" (276) 4˗5/8" (117) 4˗1/4" (108)
E .217 (140.0) 1” 1-1/4” 25 F 10˗1/4" (260) 10˗7/8" (276) 4˗5/8" (117) 4˗1/4" (108)
F .353 (227.7) 1” 1-1/2” 25 F 11" (279) 11˗5/8" (295) 4˗5/8" (117) 4˗5/8" (117)
F .353 (227.7) 1-1/2” 1-1/2” 40 G 12˗7/8" (327) 13˗1/2" (343) 4˗5/8" (117) 4˗5/8" (117)
G .554 (357.4) 1-1/4” 2” 32 G 12˗3/8" (314) 13" (330) 5˗5/8" (143) 4˗3/4" (121)
G .554 (357.4) 2” 2” 50 F 14" (356) 14˗1/2" (368) 7˗1/8" (181) 6˗1/2" (165)
H .923 (595.5) 1-1/2” 2-1/2” 40 H 14" (356) 14˗5/8" (371) 5˗7/8" (149) 5˗3/8" (137)
J 1.418 (914.8) 2” 3” 50 L 16˗5/8" (422) 17˗1/8" (435) 6˗1/2" (165) 6" (152)


Pressure - Temperature


Series Inlet
Sizes
Metals Min. Temp
°F (°C)
Max. Temp3,4
°F (°C)
Max Pressure1,2
PSI (Bar)
Services Certifications
740 1/2” to 3” Brass/Bronze -320° -(196°) 406° (208°) 300 (20.7) Air / Gas / Steam / Liquid ASME VIII, CE, CRN
741 1/2” to 3” Stainless/Bronze -320° -(196°) 425° (218°) 1500 (103.4) Air / Gas / Steam / Liquid ASME VIII, CE, CRN
742 1/2” to 3” Stainless/Carbon -20° -(29°) 425° (218°) 1500 (103.4) Air / Gas / Steam / Liquid ASME VIII, CE, CRN
743 1/2” to 3” Stainless -320° -(196°) 425° (218°) 1500 (103.4) Air / Gas / Steam / Liquid ASME VIII, CE, CRN

1:Maximum set pressure for steam service is 300 PSI (20.7 Bar)
2:Maximum set pressure for steam on Series 740 is 250 PSI (17.2 Bar)
3:Maximum temperatures depend upon seating material.
4:Contact Aquatrol for temps over 425°F (218°C)



Seating



740 Cut View
O-Ring Seating
# Description 740 741 742 743
1 Nozzle B16 SA479-316 SS SA479-316 SS SA479-316 SS
3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M
4 Disc Holder B16 B16 SA479-316 SS SA479-316 SS
6 Disc Holder Shaft B16 B16 SA479-316 SS SA479-316 SS
25 O-Ring Disc SA479-316 SS SA479-316 SS SA479-316 SS SA479-316 SS
26 Screw 18-8 SS 18-8 SS 18-8 SS 18-8 SS
27 Disc Insert SA479-316 SS SA479-316 SS SA479-316 SS SA479-316 SS
28 O-Ring Various Various Various Various




740 Cut View
PTFE Seating
# Description 740 741 742 743
1 Nozzle B16 SA479-316 SS SA479-316 SS SA479-316 SS
3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M
4 Disc Holder B16 B16 SA479-316 SS SA479-316 SS
6 Disc Holder Shaft B16 B16 SA479-316 SS SA479-316 SS
24 Disc PTFE PTFE PTFE PTFE
 






Seating Materials
Material Names Min Temp
°F (°C)
Max Temp
°F (°C)
*Use for:
FKM Viton-A -13° -(25°) 446° (230°) Acetone, Air, Alcohol, Benzine, Butane, Ethylene, Ethylene Glycol, Ethyl Alcohol, Gasoline, Isobutyl Alcohol, Kerosene, Lube Oil, Natural Gas, Naphtha, Nitrogen, Propane, Water, Xylene
Nitrile Buna-N -40° -(40°) 250° (121°) Air, Butane, Carbon Dioxide, Diesel Oil, Ethyl Chloride, Ethyl Ether, Fuel Oil, Gasoline, Helium, Hydrogen Sulphide, Kerosene, Natural Gas, Nitrogen, Oxygen (Gas), Propane
EPDM
-40° -(40°) 303° (151°) Steam, Water, Hot Water, Acetone, Beer, Brake Fluid, Hydrogen Gas, Sulfur Dioxide, Acids, Alkalies
FFKM Kalrez® -10° -(23°) 550° (288°) Aromatic Hydrocarbons, Chlorinated Hydrocarbons, Polar Solvents (ketones, esters, ethers), Inorganic and Organic Acids, Water, and Steam (Steam service up to 380°F (193°C) saturated)
PTFE
-300° -(184°) 450° (232°) Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam







Note:
For more information on o-ring materials, visit:
Marco Rubber O-Ring Comparison
Apple Rubber Selection Guide




Ordering




Series 740 thru 743 - Threaded Inlet – Part Numbers
740 ED 1 V 3 J 1 125
Series Description Orifice/Size ID Connection Seating Cap Service Options Set
740 Brass/Bronze DC- 1/2” x 3/4” 1- NPT MxF M- Metal 1- Lift lever K- ASME VIII-Air/gas 1- None Ex.125
741 316 SS/Bronze DD- 1/2” x 1” 2- NPT FxF P- PTFE 2- Closed cap L- ASME VIII-Steam 2- Chrome
Plating

742 316 SS/Carbon DE- 3/4” x 3/4” 3- BSPT MxF R- PCTFE 3- Packed lift lever J- ASME VIII-Liquid
743 316 Stainless DF- 3/4” x 1” 4- BSPT FxF V- Viton 4- Lift Lever with
Anti-Vibe Spring
P- CE - Air/gas 3- O2 Cleaned


DG- 1” x 1” 8- BSPP MxF B- Buna E- CE - Steam 4- API Seating


EA- 1/2” x 1” 9- BSPP FxF K- Kalrez 5- Closed Cap
with Test Gag
D- CE - Liquid 5- O2 Clean /
API Seating



EB- 1/2” x 1-1/4”

E- EPDM N- Non-code Air/gas


EC- 3/4” x 1”



6- Packed Lever
with Test Gag
T- Non-code Steam




ED- 3/4” x 1-1/4”



U- Non-code Liquid




EG- 1” x 1”












EF- 1” x 1-1/4”












EH- 1-1/4” x 1-1/4”

Note:
This chart is for
threaded inlets only.







FF- 1” x 1-1/2”








FH- 1-1/4” x 1-1/2”








FG- 1-1/2” x 1-1/2”








GG- 1-1/4” x 2”








GH- 1-1/2” x 2”








GF- 2” x 2”












HH- 1-1/2” x 2-1/2”












HJ- 2” x 2-1/2”












HK- 2-1/2” x 2-1/2”












JJ- 2” x 3”












JK- 2-1/2” x 3”












JL- 3” x 3”











Series 740 thru 743 - Tri-Clamp Inlet – Part Numbers
743 ED 5 M 1 L 1 125
Series Description Orifice/Size ID Connection Seating Cap Service Options Set
740 Brass/Bronze DE- 3/4” x 3/4” 5- Tri-clamp x NPT M- Metal 1- Lift lever K- ASME VIII - Air/gas 1- None Ex.125
741 316 SS/Bronze DF- 3/4” x 1” P- PTFE 2- Closed cap L- ASME VIII - Steam 2- Chrome
Plating

742 316 SS/Carbon DH- 1” x 3/4” 6- Tri-clamp x BSPT R- PCTFE 3- Packed lift lever J- ASME VIII - Liquid
743 316 Stainless DG- 1” x 1” V- Viton 4- Lift Lever with
Anti-Vibe Spring
P- CE - Air/gas 3- O2 Cleaned


DJ- 1-1/2” x 3/4”

B- Buna E- CE - Steam 4- API Seating


DK- 1-1/2” x 1”

K- Kalrez 5- Closed Cap
with Test Gag
D- CE - Liquid 5- O2 Clean /
API Seating



EC- 3/4” x 1”

E- EPDM N- Non-code Air/gas


ED- 3/4” x 1-1/4”



6- Packed Lever
with Test Gag
T- Non-code Steam




EG- 1” x 1”



U- Non-code Liquid




EF- 1” x 1-1/4”












EJ- 1-1/2” x 1”












EK- 1-1/2” x 1-1/4”

Note:
This chart is for
Tri-Clamp inlets only







FF- 1” x 1-1/2”








FG- 1-1/2” x 1-1/2”








GE- 1” x 2”








GH- 1-1/2” x 2”








HH- 1-1/2” x 2-1/2”








HJ- 2” x 2-1/2”












JG- 1-1/2” x 3”












JJ- 2” x 3”














Series 742 and 743 – Lap Joint Flange – Part Numbers
742 ED A V 3 J 1 A 125
Series Descr. Orifice/Size ID Connection Seating Cap Service Options Face Set
742 316 SS/
Carbon
DC- 1/2” x 3/4” A- 150# x150# M- Metal 1- Lift lever K- ASME VIII-Air/gas 1- None A- Serrated x
Serrated
Ex.125
DD- 1/2” x 1” B- 300# x 150# P- PTFE 2- Closed cap L- ASME VIII-Steam 2- Chrome Plated
743 316 S.S. DF- 3/4” x 1” C- 600# x 150# R- PCTFE 3- Packed lift lever J- ASME VIII-Liquid 3- O2 Cleaned B- Flat x
Serrated



EC- 3/4” x 1” D- 900# x 150# V- Viton 4- Lift Lever with
Anti-Vibe Spring
P- CE - Air/gas 4- API Seating


ED- 3/4” x 1-1/4” E- 150# x FNPT B- Buna E- CE - Steam 5- O2 / API C- Flat x Flat


FF- 1” x 1-1/2” F- 300# x FNPT K- Kalrez 5- Closed Cap
with Test Gag
D- CE - Liquid 6- O2 / Chrome D- Serrated x
Flat



GG- 1-1/4” x 2” G- 600# x FNPT E- EPDM N- Non-code Air/gas 7- O2 / API / Chrome


HH- 1-1/2” x 2-1/2” H- 900# x FNPT

6- Packed Lever
with Test Gag
T- Non-code Steam




JJ- 2” x 3”



U- Non-code Liquid 8- API / Chrome



















Note: This chart is for Flanged Valves Only
Other sizes and options available - Contact us for details









Capacities



LIQUID

Series 740 thru 743 Capacities
Liquid GPM – ASME Section VIII

Series 740 thru 743 Capacities
Liquid LPM – ASME Section VIII
Set
PSI
Orifice area in^2 Flow Coefficient = .791
Set
Bar
Orifice area mm^2 Flow Coefficient = .791
“D” “E” “F” “G” “H” “J”
“D” “E” “F” “G” “H” “J”
.126 .217 .353 .554 .923 1.418
81.3 140.0 227.7 357.4 595.5 914.8
5 11 18 30 47 78 121
0.2 35 60 98 153 255 392
10 14 24 38 60 100 154
0.5 46 79 129 202 336 517
15 16 28 45 71 118 181
1 60 103 168 264 439 675
20 18 31 51 80 133 204
2 81 140 227 357 594 913
25 20 35 56 88 147 226
3 99 171 278 436 726 1116
30 22 37 61 96 159 245
4 115 197 321 503 839 1289
35 23 40 66 103 172 264
5 128 220 359 563 938 1441
40 25 43 70 110 184 283
6 140 242 393 617 1027 1578
45 27 46 75 117 195 300
7 151 261 424 666 1110 1705
50 28 48 79 123 206 316
8 162 279 454 712 1186 1822
55 29 51 83 130 216 332
9 172 296 481 755 1258 1933
60 31 53 86 135 225 346
10 181 312 507 796 1326 2038
65 32 55 90 141 235 360
11 190 327 532 835 1391 2137
70 33 57 93 146 243 374
12 198 342 556 872 1453 2232
75 34 59 96 151 252 387
13 206 356 578 908 1512 2323
80 36 61 100 156 260 400
14 214 369 600 942 1569 2411
85 37 63 103 161 268 412
15 222 382 621 975 1624 2496
90 38 65 106 166 276 424
16 229 394 642 1007 1678 2577
95 39 67 108 170 284 436
17 236 407 661 1038 1729 2657
100 40 68 111 175 291 447
18 243 418 681 1068 1779 2734
125 44 76 124 195 325 500
19 250 430 699 1097 1828 2809
150 49 84 136 214 356 547
20 256 441 717 1126 1876 2882
175 53 90 147 231 385 591
22 269 462 752 1181 1967 3022
200 56 97 157 247 411 632
24 280 483 786 1233 2055 3157
225 60 103 167 262 436 671
26 292 503 818 1284 2139 3286
250 63 108 176 276 460 707
30 314 540 879 1379 2297 3529
300 69 118 193 302 504 774
35 339 583 949 1489 2481 3812
350 74 128 208 327 544 836
40 362 624 1014 1592 2653 4075
400 79 137 223 349 582 894
41.38 368 634 1032 1619 2698 4145
450 84 145 236 370 617 948
45 384 661 1076 1689

500 89 153 249 391 651 1000
48.27 398 685 1114 1749

550 93 160 261 410 682 1048
51.72 412 709 1154


600 97 168 273 428 713 1095
60 443 764



650 101 174 284 445


70 479 825



700 105 181 294 462


80 512 882



750 109 187 305



90 543 935



800 112 193




103.42 582 1003



850 116 199











900 119 205











950 122 211











1000 126 216











1100 132 227











1200 138 237











1300 143 247











1400 149 256











1500 154 265











Set pressures below 15 PSI (1.03 Bar) are NON-Code.
Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less.
Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding
over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure
relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.




AIR / GAS

Series 740 thru 743 Capacities
Air SCFM – ASME Section VIII

Series 740 thru 743 Capacities
Air Nm3/hr – ASME Section VIII
Set
PSI
Orifice area in^2 Flow Coefficient = .878
Set
Bar
Orifice area mm^2 Flow Coefficient = .878
“D” “E” “F” “G” “H” “J”
“D” “E” “F” “G” “H” “J”
.126 .217 .353 .554 .923 1.418
81.3 140.0 227.7 357.4 595.5 914.8
5 46 79 129 202 337 518
0.2 71 122 199 312 520 799
10 56 97 157 247 411 632
0.5 86 148 241 378 630 967
15 66 114 186 292 486 746
1 111 191 311 488 813 1248
20 76 132 214 336 560 860
2 161 277 451 707 1179 1811
25 87 149 243 381 634 975
3 215 371 604 948 1579 2425
30 97 167 271 425 709 1089
4 270 466 758 1189 1981 3044
35 108 186 302 474 790 1214
5 325 560 912 1431 2384 3662
40 119 205 333 523 872 1340
6 380 655 1066 1672 2786 4280
45 130 224 365 572 954 1465
7 435 750 1220 1914 3189 4899
50 141 243 396 621 1035 1591
8 490 844 1373 2156 3591 5517
55 152 263 427 671 1117 1716
9 545 939 1527 2397 3994 6136
60 164 282 458 720 1199 1842
10 600 1034 1681 2639 4396 6754
65 175 301 490 769 1281 1967
11 655 1128 1835 2880 4799 7373
70 186 320 521 818 1362 2093
12 710 1223 1989 3122 5201 7991
75 197 339 552 867 1444 2218
13 765 1318 2143 3364 5604 8609
80 208 359 583 916 1526 2344
14 820 1412 2297 3605 6007 9228
85 219 378 615 965 1607 2469
15 875 1507 2451 3847 6409 9846
90 231 397 646 1014 1689 2595
16 930 1601 2605 4088 6812 10465
95 242 416 677 1063 1771 2720
17 985 1696 2759 4330 7214 11083
100 253 436 708 1112 1852 2846
18 1040 1791 2913 4572 7617 11702
125 309 532 865 1357 2261 3474
19 1095 1885 3067 4813 8019 12320
150 364 628 1021 1602 2670 4101
20 1150 1980 3221 5055 8422 12938
175 420 724 1177 1847 3078 4729
22 1260 2169 3529 5538 9227 14175
200 476 820 1333 2093 3487 5356
24 1369 2359 3837 6021 10032 15412
225 532 916 1490 2338 3895 5984
26 1479 2548 4145 6505 10837 16649
250 587 1012 1646 2583 4304 6612
30 1699 2926 4760 7471 12447 19123
300 699 1204 1958 3073 5121 7867
35 1974 3400 5530 8679 14460 22215
350 811 1396 2271 3564 5938 9122
40 2249 3873 6300 9887 16473 25307
400 922 1588 2583 4054 6755 10377
41.38 2325 4003 6512 10221 17028 26160
450 1034 1780 2896 4545 7572 11632
45 2523 4346 7070 11095

500 1145 1972 3208 5035 8389 12888
48.27 2703 4655 7573 11885

550 1257 2164 3521 5526 9206 14143
51.72 2893 4982 8104


600 1368 2356 3833 6016 10023 15398
60 3348 5766



650 1480 2549 4146 6506


70 3897 6712



700 1591 2741 4458 6997


80 4447 7658



750 1703 2933 4771



90 4996 8605



800 1814 3125




103.42 5734 9875



850 1926 3317











900 2037 3509











950 2149 3701











1000 2261 3893











1100 2484 4277











1200 2707 4661











1300 2930 5046











1400 3153 5430











1500 3376 5814











Set pressures below 15 PSI (1.03 Bar) are NON-Code.
Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less.
Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding
over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure
relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.





STEAM

Series 740 thru 743 Capacities
Steam Lbs/hr – ASME Section VIII

Series 740 thru 743 Capacities
Steam Kg/hr – ASME Section VIII
Set
PSI
Orifice area in^2 Flow Coefficient = .878
Set
PSI
Orifice area in^2 Flow Coefficient = .878
“D” “E” “F” “G” “H” “J”
“D” “E” “F” “G” “H” “J”
.126 .217 .353 .554 .923 1.418
81.3 140.0 227.7 357.4 595.5 914.8
5 129 223 362 569 947 1455
0.2 53 92 149 234 390 599
10 158 272 442 694 1156 1776
0.5 64 111 181 284 472 726
15 186 321 522 819 1365 2097
1 83 143 233 366 610 936
20 215 370 602 944 1573 2417
2 121 208 338 531 884 1358
25 243 419 682 1070 1782 2738
3 162 278 453 711 1184 1819
30 272 468 761 1195 1991 3058
4 203 349 568 892 1486 2283
35 303 522 849 1333 2220 3411
5 244 420 684 1073 1788 2747
40 334 576 937 1470 2450 3764
6 285 491 799 1254 2090 3211
45 366 630 1025 1608 2679 4116
7 327 562 915 1436 2392 3675
50 397 684 1113 1746 2909 4469
8 368 633 1030 1617 2694 4139
55 428 738 1200 1884 3138 4822
9 409 704 1146 1798 2996 4603
60 460 792 1288 2022 3368 5174
10 450 775 1261 1979 3298 5066
65 491 846 1376 2159 3598 5527
11 491 846 1377 2161 3600 5530
70 522 900 1464 2297 3827 5880
12 533 917 1492 2342 3902 5994
75 554 954 1551 2435 4057 6232
13 574 988 1608 2523 4204 6458
80 585 1008 1639 2573 4286 6585
14 615 1059 1723 2704 4506 6922
85 616 1062 1727 2710 4516 6938
15 656 1130 1839 2886 4808 7386
90 648 1116 1815 2848 4745 7290
16 698 1201 1954 3067 5110 7850
95 679 1170 1903 2986 4975 7643
17 739 1272 2070 3248 5411 8314
100 710 1224 1990 3124 5204 7995
18 780 1343 2185 3429 5713 8777
125 867 1493 2429 3813 6352 9759
19 821 1414 2301 3611 6015 9241
150 1024 1763 2868 4502 7500 11522
20 862 1485 2416 3792 6317 9705
175 1180 2033 3307 5190 8648 13285
20.7 891 1535 2497 3919 6529 10030
200 1337 2303 3746 5879 9795 15048







225 1494 2573 4185 6568 10943 16812







250 1651 2843 4624 7257 12091 18575







275 1807 3112 5063 7946 13238 20338







300 1964 3382 5502 8635 14386 22101







Set pressures below 15 PSI (1.03 Bar) are NON-Code.
Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less.
Series 740 maximum set pressure on steam is 250 PSI (17.2 Bar)
Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding
over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure
relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.