Wabco 9347021920 Quadruple Protection Valve

Description

The Wabco 9347021920 Quadruple Protection Valve is a critical component within heavy-duty air brake systems. This valve is designed to safeguard the air brake system by isolating individual circuits in the event of a pressure loss, preventing complete brake failure. It is commonly used in trucks, buses, and trailers. The valve features dynamic operation and is manufactured to OE specification, ensuring reliable performance and compatibility. Its dimensions are 85 x 115 x 95 mm, and it operates within a temperature range of -40°C to +90°C. With precise pressure regulation – including opening and closing pressures ranging from 6.3 to 7.5 bar – and multiple port threads (M16 x 1.5 and M22 x 1.5), this valve offers a robust and dependable solution for maintaining air brake system integrity.

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 9347021920) comes with a 1-year warranty.