Wabco 4733010420 Reducing Valve

Description

The Wabco 4733010420 is a reducing valve designed for use in air brake systems. It functions to lower high inlet pressure to a stable, lower outlet pressure, ensuring consistent and reliable brake performance in commercial vehicles. This device is commonly found in trucks, buses, and trailers where precise air pressure regulation is critical for safety and operational efficiency. The reducing valve features a break point of 1.8 bar, a calculated volume of 0.98496, a distance between bolts of 60 mm, an exhaust connection of M22 x 1.5, a maximum operating pressure of 10.0 bar, mounting via 2x Ø 9 mm, port threads of M22 x 1.5 and 2x M22 x 1.5, a regulating ratio of 1.35:1, and operates within a temperature range of -40°C to +80°C. Its dimensions are 90 x 96 x 114 mm. The OE specification ensures compatibility and reliable performance.

Key Features & Benefits

This valve takes the high – pressure air from your vehicle’s air compressor – usually around 120 – 140 psi – and brings it down to a lower, more consistent pressure for things like your trailer brakes or auxiliary systems. It essentially regulates the airflow, making sure everything gets the right amount of pressure. It’s got a few parts inside that work together – a diaphragm, spring, and a valve seat – to do this. It's not just an on/off switch, it adjusts as needed. Think of it as the air pressure manager for your trailer or anything else you’re powering with air from your truck. If you're hauling a trailer with electric brakes, the reducing valve controls how much air pressure gets sent to activate those brakes. It’s part of the air processing unit, alongside your air dryer and governor, all working together to make sure you have clean, reliable air for everything that needs it. It sits in the air line between your compressor and the trailer supply line, generally.

Symptoms, Risks & Replacements

It’s hugely important for safety and proper operation. If it fails, you might not get enough pressure to your trailer brakes, or you might get too much, and that’s a bad situation. You’ll notice if it's going bad because your trailer brakes might feel weak, or they might grab really hard. You could also get a warning light on your dash indicating low air pressure. It acts like a shield, protecting your trailer’s braking system from potentially damaging high pressure, and ensuring consistent, reliable stopping power. You can find these fairly easily, even on sites like Fixparts Online, but getting a good quality one is key because it’s a crucial safety component.

Warranty Information

Wabco Reducing Valve (MPN 4733010420) comes with a 1-year warranty.