Wabco 4347000030 Double Protection Valve

Description

The Wabco 4347000030 Double Protection Valve is a critical component within air brake systems, designed to safeguard against potentially damaging pressure fluctuations. This valve is commonly used in commercial vehicles and heavy machinery to ensure reliable braking performance and system longevity. It features a calculated volume of 0.5528 and operates effectively between -40°C and +80°C, offering robust performance in diverse conditions. With port threads of M22 x 1.5, this device meets OE specifications and provides dual circuit protection with opening pressures of 5.2 + 5.2 bar at a maximum operating pressure of 8.0 bar. Its dimensions are 55 x 134 x 75 mm, and it is designed without backflow.

Key Features & Benefits

This valve basically does two key things. First, it prevents air from flowing backwards through the system if you have a leak somewhere downstream – like in a spring brake chamber or an air bag. Second, it limits the amount of air that can go to those components. It holds a reserve, so if one part suddenly needs a lot of air – say a quick brake application – it doesn’t rob air pressure from other critical parts of the system. Think of it like a little pressure regulator and safety check combined. It’s a core part of your air brake system, usually found on trucks and larger vehicles. It’s installed in the supply line that feeds air to things like the spring brakes and potentially the parking brakes. It doesn’t directly apply the brakes, it just ensures those systems have the consistent pressure they need to operate reliably, and keeps problems in one area from spreading. It acts like a shield for the rest of your air system.

Symptoms, Risks & Replacements

Without a good protection valve, you could lose service brake function or even lose parking brake hold if you develop a leak. If air can flow backward, it’s like trying to fill a bucket with a hole in it – you’ll never get the pressure you need. You’ll notice if this valve is failing because you might see your gauges fluctuating, or the parking brake might drag, or you’ll struggle to get the brakes to fully release. It’s a safety item, plain and simple. We’ve got a good selection of them at Fixparts Online, and getting a new one proactively is a lot cheaper than dealing with a brake failure on the road.

Warranty Information

Wabco Double Protection Valve (MPN 4347000030) comes with a 1-year warranty.