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A Wabco brake unloader valve performs the critical function of reducing the air pressure within the brake chamber following the unloading or expansion of refrigerant gas from the air suspension system. Two prevalent types of the Wabco brake unloader valve are commonly used in the heavy-duty industry.
Wabco Straight Unloader Valve
The Wabco straight brake unloader valve features a straight body and is primarily used in Wabco 20k, 24k, 26k, 30k, and 33k axles. Although it is widely utilized in the heavy-duty industry, it is not manufactured anymore. Because of its simple design, it effectively unload the air from the brake chamber.
Wabco Slide Unloader Valve
The Wabco slide brake unload valve has a slide mechanism and is used in various applications. Some have a yellow knob, while others have a blue one. The yellow one is commonly used in Wabco 20k and 24k slide valves, whereas the blue one is present in Wabco 30k and 33k slide valves.
The Wabco slide unloader valve performs the same function as unloading air from the brake chamber. However, it is manufactured with a more robust and advanced design. As a result, it is more durable and long-lasting. The mechanism of the brake unloader slide valve is smoother than the straight one. Moreover, it can handle more weight and air pressure.
The Wabco unloader slide valve is further categorized into two different types based on the bracket.
Wabco Short Bracket Slide Unloader Valve
The Wabco short bracket slide unloader valve has a short bracket which makes it suitable in certain applications. This unloader valve links the slide to the valve by using two bolts.
Wabco Long Bracket Slide Unloader Valve
The Wabco long bracket slide unloader has a long bracket which makes it a more versatile option. It can be used in different applications by changing the bolts and spacing.
Key specifications related to Wabco brake unloaders are as follows.
Functionality
The main function of Wabco brake unloaders is to reduce the pressure of the brake outside the trailer or truck, which in turn helps to improve suspension travel and comfortably seat the cargo goods inside the trailer.
Design and Structure
The unloader valve essentially has a main body, an inlet port, an outlet port, a control collar, and a piston. The unloader valve is usually connected with the help of a bolt to the air suspension and the air compressor of the truck or trailer. The inlet and outlet ports are usually connected via air hoses to the air compressor and air suspension of the truck or trailer. The position of the collar usually varies according to the configuration of the vehicle. In most instances, it is near the piston. The collar position determines the amount of air that is let out of the suspension system.
Operating Pressure Range
The operating pressure range of Wabco brake unloaders is between 3 to 12 bars. However, it can be as high as 15 bars in some cases.
Response Time
The response time of the unloader valve refers to the time taken by the valve to react after a change in air pressure inside the suspension system. The response time is usually between 0.5 seconds to 2 seconds, but it may vary depending on the model of the valve.
Maintaining a Wabco brake unloader valve is crucial to its proper functioning. Regular inspection can quickly determine whether or not the valve requires repair or replacement.
Long-Distance Transportation
For goods transportation companies that usually drive for over a thousand kilometers, the brake must be manageable. Hence, they need the unloader valve to reduce the trailer's weight.
Heavy-Duty Haulage
Heavy-duty, or rather, off-road vehicles have to climb steep roads in mountainous areas. Such vehicles demand heavy braking. Therefore, they need a unloader to effortlessly control the brake pressure.
High-Maintenance
Frequent unloading of the brake liner is quite unnecessary. Hence, it leads to lower liner wear and reduced brake quality.
Faulty From the Start
A faulty unloader valve will keep the brakes from unloading. This will make the vehicle harder to move, as if the brakes were still on.
Tramcars and Buses
In large public transport such as buses and the tram, the unloader valve is in charge of breaking. Tram and bus vehicles are usually heavy and require more modulation of the brakes.
When selecting the WABCO brake unloader valve for the vehicle, it is vital to consider the vehicle's make and model to ensure the unloader valve fits correctly and functions as intended. In addition, the check for any signs of wear or damage to the valve, such as cracks or breaks, should also be made. A thorough inspection of the valve helps to determine if it needs to be replaced. Testing the valve's performance is also important. It should unload the air from the brake chamber efficiently and effectively. If the valve is slow or does not unload air, it may need to be replaced.
Always use the proper tools and equipment when handling the brake unloader valve to avoid any damage or injury. It is essential to remember that the brake unloader valve is a crucial component of the vehicle's braking system and should be given the utmost care and attention. If unsure about anything regarding the brake unloader valve, it is always best to seek professional advice and assistance.
When selecting the WABCO unloader valve for bulk purchase, it is advisable to choose different models to fit various truck types. Look for suppliers who offer custom packaging options and branded packaging for resale purposes. It is advisable to buy in bulk to get better rates for resale. Select suppliers with proper quality assurance and certification so that customers will be satisfied with the product's quality. Ensure the suppliers have fast, reliable shipping options so that stock will arrive on time. If using a specific WABCO product code for ordering, ensure to request a sample first before placing a large order. A sample request will ensure that the exact product is required.
Q1: What does the Wabco brake unloader valve do?
A1: In a driver-controlled unloading system, the brake unloader valve permits the passage of air from the cab into the trailer. When this occurs, the brakes of the trailer will become unlatched.
Q2: Where is the brake unloader valve located?
A2: The brake unloader valve is commonly found in the tractor's brake system. It is usually located close to the air brake chamber.
Q3: How do you identify a brake unloader valve?
A3: Brake unloader valves can be identified easily because they have a small hose that connects to a chamber or port in the valve.
Q4: Are brake unloader valves universal?
A4: No, brake unloader valves are not universal. Different vehicles may use different unloader valves that have distinct sizes and fittings. It's important to find a unloader valve that fits the vehicle accurately.