| Product Line | Brakes |
| Category Name | Air Brake Valves |
| Part Type | Inversion Valve |
| Alternate Part Name | Brake Inversion Valve, Air Inversion Control Valve, Inversion Control Valve, Air Brake Inversion Valve |
| Model | TR-3 |
| OEM Part Number | 281459 |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Control Port Size | 1/8-27 NPT |
| Delivery Port Size | 1/4-18 NPT |
| Exhaust Port Size | Dust Shield |
| Mounting Type | Ø .280 in. x 2 |
| Supply Port Size | 1/4-18 NPT |
| Material | Die-cast Zinc |
| Exhaust Opening Ascending Pressure(CON / SUP) | 40 psi |
| Inlet Opening Descending Pressure (CON / SUP) | 25 psi |
| Inlet Opening Pressure (Const. SUP / Var. CON) | 8 psi |
| Maximum Operating Temperature | 200 deg. F (93 deg. C) |
| Minimum Operating Temperature | -40 deg. F (-40 deg. C) |
| Net Weight | 0.64 lb. |
| Cross References | "1617036C91, 170281459, 20QE2123R, 281459, 281459N, 281459X, LIV-5635; EM56350, LIV5635; EM56350, TV281459" |
| Intended Application | - Used on trucks, buses and trailers that require safe control of spring brakes in the event of a pressure failure in the system.
- Allows the spring brakes to remain disengaged when there is sufficient air pressure in the system. If the system pressure falls below a critical threshold, the valve reverses its operation and automatically activates the parking brakes.
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