What the function of the WABCO Air dryer?
In simple terms, the main function of the WABCO Air dryer is to purify the compressed air that comes out of the air compressor after being compressed. It is a key component that ensures the reliable operation of the truck’s braking system and other pneumatic components. WABCO Air dryer main functions can be divided into three categories.
- A: Remove moisture. This is the core function, and the name of the WABCO air dryer comes from this. When the air compressor sucks in a large amount of gas, during the compression process, water vapor will condense into liquid water. If this moisture enters the braking system, at extremely low temperatures, it will cause freezing, block the pipes, and lead to the failure of the entire braking system. This is why the WABCO drying unit sells exceptionally well in cold regions.
- B: Filter impurities. When the air compressor sucks in a large amount of gas, not only water will be compressed, but also dust from the air compressor wear and oil and other impurities will be compressed and sucked into the engine. The WABCO air dryer not only can filter out these impurities, but also can effectively protect the braking system and improve the safety of the entire vehicle system.
- C: Regulate system pressure: The external link of the WABCO air dryer is a four-loop protection valve, which together forms the pressure control center of the entire air circuit system. When the system pressure reaches the maximum value, it will control the air compressor to stop inputting gas. When the pressure reaches the minimum value, it will restart the air compressor to start pumping gas. This not only protects the air compressor but also maintains the stability of the system pressure.
The working principle and core components of the WABCO air dryer:
The operation process of the dryer is a simple cycle, which can be divided into two main stages: drying filtration and regeneration exhaust. To understand the working principle, one must first understand the composition of several key components. Now, let’s introduce them in detail.
- Drying tank: The interior of the drying tank is filled with desiccants, which have extremely strong moisture-absorbing capabilities. They are usually made of silica gel and are industrial-grade drying beads. Their shock resistance and regeneration ability perfectly adapt to various complex working conditions.
- Pressure regulator: When the system pressure reaches its peak, the pressure regulator will trigger to release pressure. At the same time, the dry compressed air from the air storage cylinder will be blown in the opposite direction towards the drying tank to remove the moisture on the desiccant. It is then discharged through the exhaust valve, allowing the desiccant to regain its vitality.
- Heater: In cold working environments, the heater will automatically restart to prevent the exhaust port from freezing and ensure smooth air flow.
How to maintain and service the WABCO air dryer?
WABCO’s products enjoy a very good reputation in the market for their reliable drying and filtering performance, solid materials, long service life, and excellent after-sales service. Choosing the correct model, ensuring correct installation, regular replacement and inspection play a crucial role in ensuring the safety and stable operation of the vehicle’s braking system. It can also effectively extend the overall service life of the truck.
- Each dryer cylinder has a moisture indicator. If it shows red, it should be checked immediately. In case of necessity, the dryer cylinder and filter element should be replaced promptly. Normally, they need to be replaced once every 2 years. At the same time, pay attention to whether the desiccant is contaminated, caked, or crushed. It should also be replaced in time.
- Check each valve: disassemble and inspect the intake valve, exhaust valve and outlet check valve, clean and replace worn-out sealing ring and other parts. When replacing the dryer cylinder, be sure to replace the O-ring seal. Check the heater. In cold regions, this is a very important issue.
- Before conducting any maintenance work, cut off the power supply of the dryer and ensure that the compressed air in the entire system is completely discharged. Do not work with power on or under pressure.
WABCO is one of the most important suppliers of electronic braking, stability, suspension and transmission control systems for commercial vehicles. Its products include dryers, filters, air compressors, etc., and are widely used in trucks, buses, trailers and other commercial vehicles. The casing is made of high-strength materials, which can withstand harsh environments. The content of desiccant inside is far higher than that of similar products, and the volume and compactness of the desiccant are at the industry-leading level, with stronger water filtration capacity and longer service life. Under normal use conditions, it only needs to be checked once every 2 years.
