Wabco 9347050090 Quadruple Protection Valve

Description

The Wabco 9347050090 Quadruple Protection Valve is a critical safety component within air brake systems, primarily used in commercial vehicles such as trucks and buses. It safeguards the air brake system by isolating individual spring brake chambers in case of pressure loss, preventing unintended parking brake activation or deactivation. This valve features calculated volume of 3.2283, and operates with charging pressure of 4.5 bar. It boasts dynamic closing pressures of 7.0 bar for circuits 21 & 22, and 4.5 bar for circuits 23 & 24, alongside opening pressures of 9 bar for 21 & 22, and 7.5 bar for 23 & 24. With port threads of M22 x 1.5 for ports 1, 22, 24, & 26, and M12 x 1.5 for ports 27 & 28, it ensures compatibility within standard air brake infrastructure. This device adheres to OE specifications, providing reliable performance and durability with dimensions of 106 x 141 x 216 mm.

Key Features & Benefits

This valve basically does four key things. First, it prevents air from flowing backwards in the system – think of it like a one – way street for the compressed air. Second, it maintains pressure even if the engine isn't running, so your brakes stay engaged when you need them. Third, it protects against excessive pressure buildup. Too much pressure is dangerous, and this valve releases it to keep things safe. And finally, it acts like a shield, preventing the entire air brake system from losing pressure if there’s a leak downstream – say, in a brake chamber at one of the wheels. It’s a core part of your air brake system, obviously. Specifically, it's usually placed where the service and spring brakes split. The service brakes are what you use to slow down and stop normally with the pedal. The spring brakes are a safety feature that automatically apply if you lose air pressure—it keeps the vehicle from rolling away. This valve manages the air flow to both systems, ensuring everything works as it should.

Symptoms, Risks & Replacements

It’s crucial for safety, plain and simple. If this valve fails, you’ll notice if your brakes feel spongy, or if the spring brakes don’t engage properly when you shut off the engine. A malfunctioning valve can lead to reduced braking performance, or even complete brake failure – and that’s obviously something you want to avoid. Regular checks and replacement when needed are the best way to keep everything safe. You can find a good replacement at places like Fixparts Online, and they have diagrams that can help you pinpoint the right part for your vehicle.

Warranty Information

Wabco Quadruple Protection Valve (MPN 9347050090) comes with a 1-year warranty.