MODEL 338 BLOWER RELIEF VALVE
• Large nozzle design provides high capacity.
• Soft seat design for optimum shutoff.
• Lightweight construction.
• Valve modulates specifically for bulk transportation blower applications.
• Hard coat anodized aluminum bonnet for corrosion protection.
• Tamper-resistant cap protects factory setting.
• Tested and inspected for pressure setting and leakage.
GENERAL APPLICATION
Model 338 is suitable for the protection of low to medium pressure, high volume blowers and for use on bulk hauling trailers and equipment.
TECHNICAL DATA
| Connections: | Threaded NPT |
| Temperature range: | -30° to 400°F (-34° to 204°C) |
| Pressure range: | 5 to 30 psig (0.34 to 2.07 barg) |
PARTS AND MATERIALS
| No. | Part Name | Material | Material specification |
| 1 | Adjustment screw | SS | SS 18-8 |
| 2 | Anti-tamper sea | Nylon | Commercial |
| 3 | Vent | CS | AISI 12L14 |
| 4 | Bonnet | Aluminum | 356-T6 w/anodize |
| 5 | Spring step | Aluminum | ASTM B209-5052-H32 |
| 6 | Spring | SS | 17-7 or 302 |
| 7 | Guide | Aluminum | 356-T6 w/anodize |
| 8 | Screw | SS | SS 18-8 |
| 9 | Diaphragm | Silicone | AMS-3320 |
| 10 | Disc holder | Brass | ASTM B36 Alloy 260 |
| 11 | Seat disc | Silicone | AMS-3320 |
| 12 | Washer | Aluminum | 6061-T6 |
| 13 | Rivet, bulb-tite | Aluminum | Commercial |
| 14 | Nozzle | Aluminum | ASTM B26-356-T6 |
| 15 | Lock nut | SS | SS 18-8 |
| 16 | Anti-tamper sleeve | Polyolefin | VersaFit 3/4-0-FSP |
Optional – set screw with tamper-evident heat shrink sleeve that provides protection of factory setting
SPECIFICATIONS
| End connection | Model | Weight |
| NPT | lbs. (kgs) | |
| 2" (50.8 mm) | 338 | 2.7 (1.23) |
FLOW CAPACITY (MALE THREADED)
| Set (psig) | Flow at full lift (SCFM) |
| 5 | 271 |
| 7 | 366 |
| 9 | 461 |
| 12 | 603 |
| 15 | 746 |
| 18 | 888 |
| 20 | 983 |
| 23 | 1125 |
| 25 | 1220 |
| 27 | 1315 |
| 30 | 1458 |
SELECTION GUIDE
| Example: | 0338 | - | H | 01 | - | N | M | 0015 |
| Model 0338 | ||||||||
| Variation 01 Male Inlet, with cut-off screw 02 Male Inlet, with tamper-evident sleeve | ||||||||
| Set pressure 5 psig (0005) to 30 psig (0030) |
