| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Safety Valve |
| Alternate Part Name | Air Relief Valve, Pressure Relief Valve |
| Model | ST-3 |
| OEM Part Number | 284142 |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Inlet Port Size | 1/4-18 NPT |
| Vent Size | Ø 0.125 in. |
| Material | Brass |
| Adjustable | No |
| Closing Pressure | 75% of the Minimum Opening Pressure |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Number of Vents | 1 |
| Opening Pressure | 150 ± 8 psi |
| Net Weight | 0.24 lb. |
| Cross References | 13943H, 170284142, 20QE1129, 284142, 284142N, 408425C91, AV284142, EBN205105N, EM36150, KN31400, LSV-3615, LSV3615, RKN31400 |
| Intended Application | - Used in pneumatic systems to prevent the pressure within the secondary or standby circuit from exceeding a safe level, protecting critical components such as compressors, air tanks and modulating valves.
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