Wabco 4750090040 Pressure Limiting Valve

Description

The Wabco 4750090040 is a diaphragm pressure limiting valve designed for use in air brake systems. It regulates air pressure to ensure safe and efficient braking performance in commercial vehicles. This valve features a calculated volume of 0.41251 and operates with air cooling. It delivers a pressure of 0.4 at 8.0 bar, with a maximum operating pressure of 10.0 bar and a nominal diameter of 4.0 mm. The valve's port threads are M12 x 1.5, with a bolt spacing of 54 mm. Its dimensions are 83 x 70 x 71 mm, and the total length is 89.0 mm. The operating temperature range is -40°C to +80°C, meeting OE specifications for reliable performance and durability.

Key Features & Benefits

This valve basically controls the maximum air pressure that goes into your brake system. It takes the higher pressure from your air compressor and reduces it to a safe level for the rest of your components – things like your air bags, actuators, and brake chambers. It’s a pretty simple idea, but really important for keeping everything working correctly. It doesn't make pressure, it just manages it, stepping it down to what the system needs. Think of it as a gatekeeper for your air brake system. It sits between the air compressor and the rest of the braking components. It ensures no single part is over – pressurized. It’s commonly found on trucks and trailers, anything that relies on air brakes to stop safely. Different vehicles might have it located in slightly different spots, usually somewhere along the air lines near the compressor or the first major components.

Symptoms, Risks & Replacements

Well, if this valve fails, you could have too much pressure going to parts that aren’t designed for it. That’s a recipe for blown seals, damaged actuators, or even complete brake failure. It acts like a shield, protecting the more sensitive parts of your air system. You’ll notice if it's failing – things like brakes dragging, unusually long stopping distances, or the air compressor running constantly. It's a relatively inexpensive part considering what it protects, and it's one of those things it's best to replace proactively if you suspect trouble. Fixparts Online has a good selection of these if you're looking for a replacement, and they often have diagrams that help you find the correct one for your vehicle.

Warranty Information

Wabco Pressure Limiting Valve (MPN 4750090040) comes with a 1-year warranty.