Check Specification & Cross-references
Fortpro is a trusted leader in the development and manufacturing of premium-quality truck parts designed to meet the demands of semi-trucks and heavy-duty trucks. Renowned for innovation, durability, and reliability, Fortpro products are engineered to enhance performance, safety, and efficiency across a wide range of trucking applications.
Whether you're seeking OEM replacement parts or upgrades, Fortpro provides a diverse selection of components backed by a global reputation for quality and innovation. Trust Fortpro for the parts you need to keep your vehicles on the road longer and stronger.
Basic Part Information6 attributes
| 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/Fitment Attributes3 attributes
| Application Type | Heavy Duty Trucks, Semi-Trucks |
|---|---|
| Inlet Port Size | 3/8-18 NPT |
| Vent Size | Ø 0.125 in. |
Dimensional/Physical Attributes1 attribute
| Material | Brass |
|---|
Technical/Performance Attributes6 attributes
| 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 |
Packaging / Logistics Attributes:1 attribute
| Net Weight | 0.27 lb. |
|---|
Intended Application
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.
- Bendix: 284143
- Haldex: KN31250
- Mack: 745-284143N
- Meritor: RKN31250
- Navistar-InternationaL: BX284143N
- PAI: EM56730
Dimensions Not Available.