| 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 | 284143 |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Inlet Port Size | 3/8-18 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 | 0.27 lb. |
| Cross References | 284143, 284143N, 285528, 289487, 745-284143N, 745284143N, 9638800050, 9638800060, BX284143N, EM56730, KN31250, LSV-5673, LSV5673, RKN31250, S9638800050, S9638800060 |
| 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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