MODELS 541/542/548 SAFETY VALVES
• High capacity with small size.
• Top guided disc.
• Manual lift ring.
• Factory sealed to prevent tampering or disassembly.
• Each valve tested and inspected for pressure setting and leakage.
• Canadian registered.
MODELS OVERVIEW
Model 541: ¼” or ½” male inlet thread.
Buna-N (NBR) flat seal.
Exceptional seat tightness performance.
Model 542: As model 541 except viton®(FKM) flat seal.
Model 548: As model 541 except stainless steel (ss) ball seat.
NOTE
1. Stainless steel construction temperature range -20° to 200°F (-29° to 93°C).
GENERAL APPLICATION
Suitable for use on small to medium size single and multi-stage air compressors, intercoolers,aftercoolers, instrument/control air lines and systems. also for air tanks/receivers and pressurized equipment.
TECHNICAL DATA
| Connections: | Threaded NPT or BSPT |
| Temperature range: | |
| Model 541[1]: | -40° to 200°F (-40° to 93°C) |
| Model 542: | -10° to 300°F (-23° to 149°C) |
| Model 548: | -60° to 400°F (-51° to 204°C) |
| Pressure range: | |
| Model 541: | 3 to 200 psig (0.2 to 13.8 barg) |
| Model 542: | 3 to 200 psig (0.2 to 13.8 barg) |
| Model 548: | 3 to 400 psig (0.2 to 27.6 barg) |
| Code | ASMe VIII |
PARTS AND MATERIALS
MODELS 541, 542 AND 548
| No. | Part Name | Brass construction | SST construction |
| 1 | Body | Brass, B16 | SST, SA479-316 |
| 2 | Seat[1] | Model number changes with seat material | Model number changes with seat material |
| 3 | Disc holder | Brass, B16 | SST, A582-303 |
| 4 | Spring | SST, A313-631 | SST, A313-631 |
| 5 | Compression screw | Brass, B16 | SST, A582-303 |
| 6 | Lift ring | SST, A313 | SST, A313 |
NOTES
1. Seat material: model 541 Buna-N (NBR), model 542 viton®(FKM) and model 548 SS, A756 440C.
2. Viton® is a registered trademark of duPont Performance elastomers L.L.C.
MODEL 548
Seat configuration
MODELS 541 AND 542
Seat configuration
SPECIFICATIONS
| Size | Dimensions, inch (mm) | Weight |
| inlet | C | lb (kg) |
| ¼” (7) | 2.88 (73.2) | 0.2 (0.1) |
| ½” (15) | 3.62 (91.9) | 0.5 (0.23) |
Dimensions are for reference only.
CAPACITIES
ASME section VIII AIR (U.S.,SCFM)
| Set pressure | Inlet | ||
| (psig) | ¼” | ½” | |
| 3 | 14 | 29 | |
| 5 | 18 | 37 | |
| 10 | 26 | 51 | |
| 15 | 33 | 65 | |
| 20 | 38 | 75 | |
| 25 | 43 | 85 | |
| 50 | 70 | 139 | |
| 75 | 97 | 194 | |
| 100 | 125 | 249 | |
| 125 | 152 | 304 | |
| 150 | 180 | 359 | |
| 175 | 207 | 414 | |
| 200 | 235 | 469 | |
| 225 | 262 | 524 | |
| 250 | 290 | 579 | |
| 275 | 317 | 634 | |
| 300 | 345 | 689 | |
| 325 | 372 | 744 | |
| 350 | 400 | 799 | |
| 375 | 427 | 854 | |
| 400 | 455 | 909 |
ASME SECTION VIII AIR (METRIC, Nm3/h)
| Set pressure | Inlet | ||
| (psig) | 7 mm | 15 mm | |
| 1.7 | 68 | 136 | |
| 3.5 | 114 | 227 | |
| 5.0 | 152 | 304 | |
| 7.0 | 203 | 407 | |
| 9.0 | 255 | 509 | |
| 13.0 | 357 | 715 | |
| 15.0 | 409 | 818 | |
| 17.0 | 460 | 920 | |
| 19.0 | 511 | 1023 | |
| 21.0 | 563 | 1126 | |
| 23.0 | 614 | 23.0 | 1228 |
| 25.0 | 665 | 25.0 | 1331 |
| 27.0 | 717 | 1434 | |
| 27.5 | 730 | 27.5 | 1459 |
SELECTION GUIDE
| Example: | 0541 | - | A | 01 | A | K | M | 0200 |
| Model 0541 0542 0548 | ||||||||
| Inlet size A ¼" (7 mm) C ½" (15 mm) | ||||||||
| Variation 01 Brass construction with NPT threads 02 Stainless steel construction with NPT threads (models 541 and 542 only) 60 Brass construction with BSPT threads 62 Stainless steel construction with BsPt threads (models 541 and 542 only) | ||||||||
| Design revision Indicates non-interchangeable revision - Original design (model 548) A Revision A, flat seat (models 541 and 542) | ||||||||
| Service K ASME VIII air/gas N Non-code air/gas (required for set pressures below 15 psig) | ||||||||
| Spring material M SS | ||||||||
| Set pressure 548 3 psig (0003) (0.2 barg) to 400 psig (0400) (27.5 barg) 541 3 to 200 542 3 to 200 |
