Series 740 Safety Relief Valves
| Series 740 thru 743 | |||||
| # | Description | 740 | 741 | 742 | 743 |
| 1 | Nozzle | B16 Brass | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 2 | Lock Screw | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 3 | Lower Ring | SA351-CF8M | SA351-CF8M | SA351-CF8M | SA351-CF8M |
| 4 | Disc Holder | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 5 | Disc Holder Shaft | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 6 | Disc Guide | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 7 | Bonnet | B16 Brass | B16 Brass | SA108-1117/SA216 | SA351-CF8M |
| 8 | Hood Seal | PTFE | PTFE | PTFE | PTFE |
| 9 | Seal Wire | Steel / Lead | Steel / Lead | Steel / Lead | Stainless / Lead |
| 10 | Hood | B16 Brass | B16 Brass | SA108-1018 | SA479-316 SS |
| 11 | Pressure Screw | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 12 | Lock Nut | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 13 | Spring Plate | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 14 | Spring | 302/17-7 SS | 302/17-7 SS | 302/17-7 SS | 302/17-7 SS |
| 15 | Spring Post | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 16 | Spring Pin | 18-8 SS | 18-8 SS | 18-8 SS | 18-8 SS |
| 17 | Guide Seals (2) | PTFE | PTFE | PTFE | PTFE |
| 18 | Disc | SA479-316 SS | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 19 | Body | B584-C84400 | B584-C84400 | SA216-WCB | SA351-CF8M |
| 20 | Nozzle Seal | PTFE | PTFE | PTFE | PTFE |
| 21 | Nameplate | Stainless | Stainless | Stainless | Stainless |
| 22 | Lock Screw Seal | PTFE | PTFE | PTFE | PTFE |
| Series 741 thru 743 Lap Joint Flange Option | ||||
| # | Description | 741 | 742 | 743 |
| 1 | Lap Joint Nozzle | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 29 | Outlet Fitting | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 30 | Lap Joint Flange | 316 Stainless | CS A-105 | 316 Stainless |
| 31 | Lap Joint Flange | 316 Stainless | CS A-105 | 316 Stainless |
Sizes
| Series 740 thru 743 Threaded Sizes | |||||||||||||||
| 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) |
| E¹ | .217 | (140.0) | 1/2” | 1” | 15 | A | 8˗1/8" | (206) | 9" | (229) | 2˗5/8" | (67) | 2" | (51) | 3 (1.4) |
| E¹ | .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" | (235) | 2˗5/8" | (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” | 40 | F | 11˗3/4" | (298) | 12˗1/4" | (308) | 3˗1/2" | (89) | 2˗7/8" | (73) | 16 (7.3) |
| H | .923 | (595.5) | 2” | 2” | 50 | G | 11˗3/4" | (298) | 12˗1/4" | (308) | 3˗1/2" | (89) | 2˗7/8" | (73) | 16 (7.3) |
| H | .923 | (595.5) | 1-1/2” | 2-1/2” | 40 | H | 11˗3/4" | (298) | 12˗1/4" | (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˗1/4" | (308) | 3˗1/2" | (89) | 2˗7/8" | (73) | 16 (7.3) |
| H | .923 | (595.5) | 2-1/2” | 2-1/2” | 65 | K | 12" | (305) | 12˗1/2" | (318) | 3˗3/4" | (95) | 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) |
¹ - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas and Steam Only
| Series 741 thru 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” | 3/4” | 15 | C | 9˗5/8" | (244) | 10˗1/4" | (260) | 4˗5/8" | (117) | 4˗1/4" | (108) |
| 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” | 3/4” | 20 | E | 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) |
| E¹ | .217 | (140.0) | 1/2” | 1” | 15 | A | 10˗1/4" | (260) | 10˗7/8" | (276) | 4˗5/8" | (117) | 4˗1/4" | (108) |
| E¹ | .217 | (140.0) | 1/2” | 1-1/4” | 15 | B | 10˗1/4" | (260) | 10˗7/8" | (276) | 4˗5/8" | (117) | 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” | 25 | G | 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) |
| E | .217 | (140.0) | 1-1/4" | 1-1/4” | 32 | H | 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) | 1-1/4” | 1-1/2” | 32 | H | 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 | 11" | (279) | 11-5/8" | (295) | 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) | 1-1/2" | 2” | 40 | H | 12-3/8" | (356) | 13" | (368) | 5-5/8" | (181) | 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” | 40 | F | 14" | (356) | 14˗5/8" | (371) | 5˗7/8" | (149) | 5˗3/8" | (137) |
| H | .923 | (595.5) | 2” | 2” | 50 | G | 14" | (356) | 14˗5/8" | (371) | 5˗7/8" | (149) | 5˗3/8" | (137) |
| 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) |
| H | .923 | (595.5) | 2” | 2-1/2” | 50 | J | 14" | (356) | 14˗5/8" | (371) | 5˗7/8" | (149) | 5˗3/8" | (137) |
| H | .923 | (595.5) | 2-1/2” | 2-1/2” | 65 | K | 14" | (356) | 14˗5/8" | (371) | 5˗7/8" | (149) | 5˗3/8" | (137) |
| J | 1.418 | (914.8) | 2” | 3” | 50 | J | 16˗5/8" | (422) | 17˗1/8" | (435) | 6˗1/2" | (165) | 6" | (152) |
| J | 1.418 | (914.8) | 2-1/2” | 3” | 65 | K | 16-5/8" | (422) | 17˗1/8" | (435) | 6-1/2" | (165) | 6" | (165) |
| J | 1.418 | (914.8) | 2” | 3” | 80 | J | 16˗5/8" | (422) | 17˗1/8" | (435) | 6˗1/2" | (165) | 6" | (152) |
¹ - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas and Steam Only
Pressure - Temperature
| Series | Inlet Sizes |
Metals1 | Min. Temp °F (°C) |
Max. Temp4,5 °F (°C) |
Max Pressure2,3 psig (barg) |
Services | Certifications | |||
| 740 | 1/2” to 3” | Brass/Bronze | -320° | -(196°) | 406° | (208°) | 350 | (24.1) | 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°) | 800° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | ASME VIII, CE, CRN |
| 743 | 1/2” to 3” | Stainless | -320° | -(196°) | 800° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | ASME VIII, CE, CRN |
| 744 | 1/2” to 3” | Monel/Bronze | -320° | -(29°) | 800° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | ASME VIII, CE, CRN |
| 745 | 1/2” to 3” | Monel/Carbon | -320° | -(196°) | 800° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | ASME VIII, CE, CRN |
| 746 | 1/2” to 3” | Monel/Stainless | -320° | -(29°) | 800° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | ASME VIII, CE, CRN |
| 747 | 1/2” to 3” | No-Lead/No-Lead | -320° | -(196°) | 406° | (218°) | 350 | (103.4) | Air / Gas / Steam / Liquid | Non-Code |
| 748 | 1/2” to 3” | Stainless/No-Lead | -320° | -(29°) | 425° | (218°) | 1500 | (103.4) | Air / Gas / Steam / Liquid | Non-Code |
1 Other metal options available, contact Aquatrol.
2 Maximum set pressure for steam service
is 300 psig (20.7 barg)
3 Maximum set pressure for steam on Series 740 is 250 psig (17.2 barg)
4 Maximum temperatures depend upon seating material.
5 For temps over 425°F (218°C) contact Aquatrol. (Inconel
spring used temperatures above 650°F)
Seating
| O-Ring Seating | |||||
| # | Description | 740 | 741 | 742 | 743 |
| 1 | Nozzle | B16 Brass | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 3 | Lower Ring | SA351-CF8M | SA351-CF8M | SA351-CF8M | SA351-CF8M |
| 4 | Disc Holder | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 6 | Disc Holder Shaft | B16 Brass | B16 Brass | 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 |
| PTFE Seating | |||||
| # | Description | 740 | 741 | 742 | 743 |
| 1 | Nozzle | B16 Brass | SA479-316 SS | SA479-316 SS | SA479-316 SS |
| 3 | Lower Ring | SA351-CF8M | SA351-CF8M | SA351-CF8M | SA351-CF8M |
| 4 | Disc Holder | B16 Brass | B16 Brass | SA479-316 SS | SA479-316 SS |
| 6 | Disc Holder Shaft | B16 Brass | B16 Brass | 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 | Markez® | 5° | −(15°) | 500° | (260°) | 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) |
| Kalrez® | −10° | −(23°) | 550° | (288°) | ||
| PTFE | −400° | −(240°) | 500° | (232°) | Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam | |
| PCTFE | Kel-F® | −400° |
−(240°) |
245° |
(118°) |
Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam |
| Silicone | −75° | −(60°) | 400° | (204°) | Air, Helium, Nitrogen, Oxygen (Gas) | |
| Note: For more information on o-ring materials, visit: Marco Rubber O-Ring Comparison Apple Rubber Selection Guide |
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Ordering
| Series 740 thru 748 - 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 | B- | Buna | 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 | |
| 744 | Monel/Bronze | DG- | 1” x 1” | 8- | BSPP MxF | E- | EPDM | E- | CE - Steam | 4- | API Seating | |||
| 745 |
Monel/Carbon |
EA2- | 1/2” x 1” | 9- | BSPP FxF | K- | Kalrez | 5- | Closed Cap with Test Gag |
D- | CE - Liquid | 5- | O2 Clean / API Seating |
|
| 746 | Monel/316 SS | EB2- | 1/2” x 1-1/4” | Z- | Markez | N- | Non-code Air/Gas | |||||||
| 7471 |
No-Lead/No-Lead |
EC- | 3/4” x 1” | C- |
PCTFE |
6- | Packed Lever with Test Gag |
T- | Non-code Steam | 6- | O2 Clean / Chrome |
|||
| 7481 | 316 SS/No-Lead | ED- | 3/4” x 1-1/4” | S- |
Silicone |
U- | Non-code Liquid | |||||||
| EG- | 1” x 1” | A- | Open Lever with Test Gag |
5- | O2 / API / Chrome |
|||||||||
| EF- | 1” x 1-1/4” | |||||||||||||
| Note: This chart is for threaded inlets only. |
EH- | 1-1/4” x 1-1/4” | 8- | API / Chrome | ||||||||||
| FF- | 1” x 1-1/2” | 9- | Inconel Spring | |||||||||||
| FH- | 1-1/4” x 1-1/2” | A- | High Temp Seals | |||||||||||
| FG- | 1-1/2” x 1-1/2” | B- | HT Seals and Inconel Spring |
|||||||||||
| GG- | 1-1/4” x 2” | |||||||||||||
| GH- | 1-1/2” x 2” | |||||||||||||
| GF- | 2” x 2” | |||||||||||||
| HF- | 1-1/2” x 2” | |||||||||||||
| HG- | 2” x 2” | |||||||||||||
| HH- | 1-1/2” x 2-1/2” | |||||||||||||
| 1 - No-Lead is non-code and available for D,E,F Orifice non-code Only 2 - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas, Steam Only 3 - BSPP Outlet is available for 740 and 741 Series Only |
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 and 748 - Tri-Clamp Inlet – Part Numbers | ||||||||||||||
| 743 | ED | 5 | M | 1 | L | 1 | 125 | |||||||
| Series | Description | Orifice/Size ID | Connection | Seating | Cap | Service | Options | Set | ||||||
| 741 | 316 SS/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 |
| 742 | 316 SS/Carbon | DF- | 3/4” x 1” | P- | PTFE | 2- | Closed cap | L- | ASME VIII - Steam | 2- | Chrome Plating |
|||
| 743 | 316 Stainless |
DH- | 1” x 3/4” | 6- | Tri-clamp x BSPT | B- | Buna | 3- | Packed lift lever | J- | ASME VIII - Liquid | |||
| 7481 | 316 SS/Carbon | DG- | 1” x 1” | V- | Viton | 4- | Lift Lever with Anti-Vibe Spring |
P- | CE - Air/gas | 3- | O2 Cleaned | |||
| EC- | 3/4” x 1” | E- | EPDM | E- | CE - Steam | 4- | API Seating | |||||||
| ED- | 3/4" x 1-1/4" | K- | Kalrez | 5- | Closed Cap with Test Gag |
D- | CE - Liquid | 5- | O2 Clean / API Seating |
|||||
| Note: This chart is for Tri-Clamp inlets only |
EG- | 1” x 1” | Z- | Markez | N- | Non-code Air/gas | ||||||||
| EF- | 1” x 1-1/4” | C- |
PCTFE |
6- | Packed Lever with Test Gag |
T- | Non-code Steam | 6- | O2 Clean / Chrome |
|||||
| EJ- | 1-1/2” x 1” | S- |
Silicone |
U- | Non-code Liquid | |||||||||
| EK- | 1-1/2” x 1-1/4” | A- | Open Lever with Test Gag |
7- | O2 / API / Chrome | |||||||||
| FF- | 1” x 1-1/2” | |||||||||||||
| FG- | 1-1/2” x 1-1/2” | 8- | API / Chrome | |||||||||||
| GH- | 1-1/2” x 2” | 9- | Inconel Spring | |||||||||||
| GF- | 2” x 2” | A- | High Temp Seals | |||||||||||
| HF- | 1-1/2” x 2” | B- | HT Seals and Inconel Spring |
|||||||||||
| HG- | 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” | |||||||||||||
| 1 - No-Lead is non-code and available for D,E,F Orifice, non-code Only |
JK- | 2-1/2” x 3” | ||||||||||||
| JL- | 3” x 3” | |||||||||||||
| Series 741 and 746 and 748 – 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 Finish | Set | |||||||
| 741 | 316 SS/ Bronze | DC- | 1/2” x 3/4” | A- | 150# x 150# | M- | Metal | 1- | Lift lever | K- | ASME VIII-Air/gas | 1- | None | A- | Serrated x Serrated |
Ex.125 |
| 742 | 316 SS/Carbon | DD- | 1/2” x 1” | B- | 300# x 150# | P- | PTFE | 2- | Closed cap | L- | ASME VIII-Steam | 2- | Chrome Plating | |||
| 743 | 316 S.S. | DE- | 3/4” x 1” | C- | 600# x 150# | B- | Buna | 3- | Packed lift lever | J- | ASME VIII-Liquid | B- | Flat x Serrated |
|||
| 744 | Monel/Bronze | DF- | 3/4” x 1” | D- | 900# x 150# | V- | Viton | 4- | Lift Lever with Anti-Vibe Spring |
P- | CE - Air/gas | 3- | O2 Cleaned | |||
| 745 | Monel/Carbon | DG- | 1” x 1” | E- | 150# x FNPT | E- | EPDM | E- | CE - Steam | 4- | API Seating | C- | Smooth x Smooth |
|||
| 746 | Monel/316 SS | EA2- | 1/2” x 1” | F- | 300# x FNPT | K- | Kalrez | 5- | Closed Cap with Test Gag |
D- | CE - Liquid | 5- | O2 Clean / API Seating |
|||
| 7481 | 316 SS/No-Lead | EB2- | 1/2” x 1-1/4” | G- | 600# x FNPT | Z- | Markez | N- | Non-code Air/gas | D- | Serrated x Flat |
|||||
| EC- | 3/4" x 1" | H- | 900# x FNPT | C- |
PCTFE |
6- | Packed Lever with Test Gag |
T- | Non-code Steam | 6- | O2 Clean / Chrome |
|||||
| ED- | 3/4" x 1-1/4" | J- | 300# x 300# | S- |
Silicone |
U- | Non-code Liquid | E- | Welded Serrated |
|||||||
| Note: This chart is for flanged inlets only |
EG- | 1” x 1” | K- | 600# x 600# | A- | Open Lever with Test Gag |
7- | O2 / API / Chrome |
||||||||
| EF- | 1” x 1-1/4” | L- | 900# x 900# | F- | Welded Flat |
|||||||||||
| EH- | 1-1/4” x 1-1/4” | M- | 150# x FBSPT | 4- | API / Chrome | |||||||||||
| FF- | 1” x 1-1/2” | N- | 300# x FBSPT | 9- | Inconel Spring | |||||||||||
| FH- | 1-1/4” x 1-1/2” | P- | 600# x FBSPT | A- | High Temp Seals | |||||||||||
| FG- | 1-1/2” x 1-1/2” | R- | 900# x FBSPT | B- | HT Seals and Inconel Spring |
|||||||||||
| GG- | 1-1/4” x 2” | S- | 600# x 300# | |||||||||||||
| GH- | 1-1/2” x 2” | T- | 900# x 300# | |||||||||||||
| GF- | 2” x 2” | |||||||||||||||
| HF- | 1-1/2” x 2” | |||||||||||||||
| HG- | 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” | |||||||||||||||
| 1 - No-Lead is non-code and available for D,E,F Orifice, non-code only 2 - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas, Steam Only |
JJ- | 2” x 3” | ||||||||||||||
| JK- | 2-1/2” x 3” | |||||||||||||||
| JL- | 3” x 3” | |||||||||||||||
Capacities
LIQUID
| Series 740 thru 748 Capacities Liquid GPM – ASME Section VIII |
Series 740 thru 748 Capacities Liquid LPM – ASME Section VIII |
|||||||||||||
| Set psig |
Orifice area in^2 Flow Coefficient = .791 | Set barg |
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 not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) 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 748 Capacities Air SCFM – ASME Section VIII |
Series 740 thru 748 Capacities Air Nm3/hr – ASME Section VIII |
|||||||||||||
| Set psig |
Orifice area in^2 Flow Coefficient = .878 | Set barg |
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 not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) 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 748 Capacities Steam Lbs/hr – ASME Section VIII |
Series 740 thru 748 Capacities Steam Kg/hr – ASME Section VIII |
|||||||||||||
| Set psig |
Orifice area in^2 Flow Coefficient = .878 | Set barg |
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 | 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 not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) whichever is less. Series 740 maximum set pressure on steam is 250 psig (17.2 barg) 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. |
||||||||||||||