Wabco 4750100140 Pressure Limiting Valve

Description

The Wabco 4750100140 Pressure Limiting Valve is a crucial component within air brake systems, designed to regulate and limit air pressure. It's used in commercial vehicles and trailers to ensure safe and controlled braking performance. This device maintains consistent pressure, protecting the system from overloads and ensuring optimal functionality. The valve features a calculated volume of 1.4 and operates with a delivered pressure of 7.0 bar at 15.0 bar, with a maximum operating pressure of 20.0 bar. Its adjustable range is 6.0 to 9.0 bar, and it accommodates port threads of M22 x 1.5. The valve measures 140 x 100 x 100 mm and is built to OE specification, operating effectively within a temperature range of -40°C to +80°C. The distance between mounting bolts is 56.5 mm, and it utilizes 2x Ø 8.6 mm mounting points.

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 4750100140) comes with a 1-year warranty.