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(888) 312-8812 Login SignupThe WABCO Air Brake Unloader Valve eliminates unnecessary mechanical drag on commercial vehicle engines by venting residual pressure from the air compressor head during the unloading phase. As the primary storage reservoirs reach full capacity, the valve receives a pneumatic signal from the governor to open a dedicated exhaust path, allowing the compressor pistons to cycle freely without working against trapped system pressure. Without this pressure relief, unnecessary compressor loading can accelerate wear on internal components and increase engine demand over time. By controlling compressor unloading as intended, the WABCO 9753034730 helps reduce operating strain while supporting efficient air system performance.
| Size | 169 x 108 x 91 |
| Opening Pressure | 12.0 bar |
| Weight | 1.664 |
| Max. operating pressure | 362.6 psi |
| Temperature Range | -40°C to +80°C |
| Cut-Out Pressure | 8.1 bar |
| Port Thread 1-2 | M16 x 1.5 |
| Operational Range | 0.6+0.4 bar |
| Calculated Volume (dm³) | 1.661 |
| Port thread 3 | Union Ø 0.79 in |
| Port thread 1 | M22 x 1.5 |
| Version | With tire inflating valve |
| Port threads | M22 x 1.5 |
| Mounting | 2x Ø 8.8 mm |
| Port thread 22 | M12 x 1.5 |
| Type | With one way valve |
| Port thread 21 | M22 x 1.5 |
| Brand | Part Number |
|---|---|
| 02516923, 02516973, 42085762, 81521016083, 81521016085, 81521016132, 0014310606, 0014313406, 0024314906, 7700051785 | |
| DAF | 1506504 |
| IVECO | 02516892 |
| KOGEL | 6789355 |
| MAN | 81521016076 |
| MERCEDES-BENZ | 0014310006 |
| MERITOR | S9753034730 |
| NEOPLAN | 1102733544138 |
| NEWSTAR | S-9976 |
| SCANIA | 5000243947 |
| SCHMITZ | 9454310 |
| WABCO | S9753034730 |
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Whether it’s for cars, buses, trucks, or trailers, WABCO® is at the frontline at developing and providing products and systems to make vehicles safer and easier to control. Founded in 1869, WABCO is a major supplier of braking, stability, suspension and transmissions in the Americas and beyond. The company is recognized as introducing the modern air brake system in 1869, and continues to lead the industry in air brake design and production for the heavy duty and commercial vehicle sectors. Today, WABCO operates as a division of the German auto parts maker ZF and employs 16,000 employees in facilities in 36 countries worldwide.
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