Wabco 4750090050 Pressure Limiting Valve Diaphragm

Description

The Wabco 4750090050 is a pressure regulator designed for compressed-air technology within braking systems. This pressure limiting valve diaphragm is a critical component in air brake systems, ensuring safe and reliable operation by maintaining consistent air pressure. It is used in applications requiring precise pressure control, contributing to optimal braking performance and system longevity. This device features a nominal diameter of 4.0 mm, port threads of M12 x 1.5, and operates within a temperature range of -40°C to +80°C. Its dimensions are 83 x 70 x 71 mm, and it's designed to OE specification for seamless integration and performance.

Key Features & Benefits

This little rubber diaphragm is really the heart of your pressure limiting valve. Basically, it reacts to air pressure within the braking system. It moves up and down with changes in that pressure, and that movement is what actually controls when the valve opens or closes. It’s a simple principle, but really important for safety. It’s the thing that physically allows or prevents air from reaching certain parts of the brake system. Think of this valve, and especially the diaphragm inside, as a safety net for your air brakes. It’s there to protect components downstream from getting too much air pressure. It's usually located somewhere along the air lines leading to your air bags or even the main brake chambers. If pressure starts to build up higher than it should – maybe from a faulty compressor or another issue – the valve restricts the flow, preventing damage and keeping everything operating safely. It’s a crucial part of preventing brake lockup or even component failure.

Symptoms, Risks & Replacements

You’ll notice if this thing fails, generally. The brakes might feel spongy, or you might have trouble building up air pressure to a safe level. But more seriously, without a functioning diaphragm, you run the risk of over – pressurizing parts of the system and causing them to burst or malfunction. It really acts like a shield for the rest of the air brake system. These diaphragms can get old, crack, or wear out over time, especially with temperature swings and constant use. If you’re doing preventative maintenance or chasing a brake issue, this is a pretty common thing to check. You can find replacements pretty easily – we have a good selection at Fixparts Online, and other auto parts suppliers do too. It’s a relatively inexpensive part to replace, but it can save you a lot of trouble – and expense – down the road.

Warranty Information

Wabco Pressure Limiting Valve Diaphragm (MPN 4750090050) comes with a 1-year warranty.