| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Safety Valve |
| Alternate Part Name | Air Relief Valve, Pressure Relief Valve |
| Model | ST-1 |
| OEM Part Number | 205105 |
| Application Type | Semi-Trucks, Heavy Duty Trucks |
| Inlet Port Size | 1/4-18 NPT |
| Vent Size | Ø 0.125 in. |
| Material | Brass |
| Adjustable | Yes |
| 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 ± 5 psi |
| Net Weight | 0.30 lb. |
| Cross References | 1676692C1, 170205105, 205105, 205105N, 745-205105, 745-205105N, 745205105, 745205105N, EBN205105N, EM56780, KN31400, KN31400N, LSV-5678, LSV5678, R955205105N |
| Intended Application | - Used in heavy vehicle air brake systems to protect the pneumatic system against overpressure. Its main application focuses on the automatic release of compressed air when the pressure in the system exceeds a preset limit, preventing damage to components such as air tanks, valves, hoses and brake chambers.
- Commonly mounted on the primary air tank or at points where excessive pressure increase could pose a risk.
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