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Precise control over a truck’s rear air suspension system is essential for maintaining ride height, stability, and load leveling. The FAW Rear Left And Right Air Control Valves, identified by the genuine OEM part number 3515020-DY799WA, are critical components that regulate airflow to the rear air springs. These valves respond to electronic signals from the suspension control module or manual controls, adjusting the vehicle’s height and stiffness according to load conditions and driving requirements. For technicians and fleet managers prioritizing vehicle performance and safety, sourcing these exact valves from our comprehensive selection of Faw truck parts guarantees perfect compatibility and factory-grade reliability.
The 3515020-DY799WA valves work in pairs to ensure balanced control between the left and right rear axles, preventing uneven suspension that can affect handling and tire wear. Their robust construction withstands the demanding environment of commercial trucking, providing accurate and durable performance that maintains optimal ride quality and stability across all load conditions.
Rear Air Control Valves
Задние клапаны управления воздухом
Válvulas de Control de Aire Traseras
The FAW 3515020-DY799WA valves are electro-pneumatic devices that control the flow of compressed air to and from the rear air springs. When the system needs to raise the vehicle, the valves open to allow air from the supply tanks into the air springs. When lowering is required, they exhaust air from the springs to the atmosphere. This precise regulation maintains a consistent ride height regardless of load weight, ensuring proper axle alignment, headlight aim, and aerodynamic efficiency. The valves operate based on signals from height sensors mounted near the axles, creating a closed-loop control system that automatically adjusts to load changes during transit, providing a stable and level ride at all times.
One of the key features of the 3515020-DY799WA system is its independent control of the left and right rear air springs. This allows the suspension system to compensate for uneven loads across the rear axle, such as when cargo is loaded more heavily on one side. By adjusting each side independently, the valves maintain a level vehicle stance, preventing body roll and ensuring even weight distribution across tires. This independent control is crucial for maintaining optimal handling characteristics, preventing premature tire wear on one side, and ensuring braking forces are evenly distributed for maximum safety during emergency stops.
Built to withstand the harsh conditions of commercial vehicle operation, the 3515020-DY799WA valves feature robust aluminum or polymer housings with precision-machined internal components. The solenoid coils are wound with high-temperature resistant wire, and the valve seats use durable elastomers that maintain their sealing properties despite constant cycling and exposure to temperature extremes. Special attention is given to the sealing technology to prevent both external air leaks and internal cross-port leakage, which could compromise system performance. The valves are designed to operate reliably for hundreds of thousands of cycles, maintaining accurate airflow control throughout their service life.
The 3515020-DY799WA valves integrate seamlessly with the truck’s electronic control systems. They typically feature multi-pin connectors that carry both power and control signals from the suspension control module. Many modern versions include diagnostic feedback capabilities, allowing the control module to monitor valve operation and detect faults such as coil failures, blockages, or leaks. This integration enables sophisticated control algorithms for automatic leveling, kneel functions for easier loading, and highway height adjustment for improved aerodynamics. The electrical design ensures compatibility with FAW’s vehicle communication networks for coordinated system operation.
By automatically adjusting air spring pressure in response to load changes, the 3515020-DY799WA valves provide consistent ride quality whether the truck is empty or fully laden. This load leveling capability maintains optimal suspension frequency (spring rate) regardless of weight, reducing driver fatigue and protecting both cargo and vehicle components from excessive vibration and shock. The system can compensate for dynamic load transfer during acceleration, braking, and cornering, enhancing both comfort and stability. For cargo-sensitive applications, this consistent ride quality helps prevent damage to delicate loads during transit.
| Specification | Detail |
|---|---|
| OEM Part Number | 3515020-DY799WA |
| Product Name | Rear Left & Right Air Control Valves |
| Brand | FAW |
| Valve Type | 3-Way Electro-Pneumatic |
| Operating Voltage | 12V or 24V DC System |
| Maximum Pressure | 150-200 PSI (10-14 Bar) |
| Port Size | 1/4″ or 3/8″ NPT |
| Compatible Models | FAW Jiefang with Air Suspension |
Replacing the 3515020-DY799WA valves requires proper system knowledge and procedure. Installation typically involves depressurizing the air system, disconnecting electrical connectors and air lines, removing the faulty valves, and mounting the new units. Care must be taken to connect air lines to the correct ports (supply, delivery, exhaust) and to use thread sealant appropriate for pneumatic systems. After installation, the system requires calibration through diagnostic equipment to set proper ride height parameters and ensure the valves respond correctly to control signals. Proper installation is crucial for system balance and preventing premature component failure.
Several symptoms indicate potential failure of the 3515020-DY799WA valves. These include uneven rear ride height, excessive leaning to one side, inability to maintain set height, audible air leaks near the valves, or suspension warning lights on the dashboard. The vehicle may also exhibit poor ride quality or bottoming out on one side. Diagnostic procedures typically involve using specialized scanners to activate the valves individually while monitoring system pressure and height sensor readings. Resistance checks on valve coils and visual inspections for physical damage or corrosion can also identify failing components before they cause complete system failure.
The 3515020-DY799WA valves are engineered to perform reliably in cold climates where moisture in air systems can freeze and cause valve malfunction. Internal designs often include features to prevent ice accumulation on moving parts, and materials are selected to remain flexible at low temperatures. Proper system maintenance including regular draining of air tanks and use of air dryers is essential to protect these valves from moisture-related issues. The valves’ durability in temperature extremes ensures consistent suspension control whether operating in freezing winter conditions or hot summer environments.
Properly functioning 3515020-DY799WA valves significantly impact vehicle dynamics and safety. By maintaining correct ride height, they ensure optimal suspension geometry for predictable handling. Level suspension prevents uneven headlight aiming that could blind other drivers or reduce visibility. Balanced spring pressures ensure even tire contact with the road, maximizing traction during braking and cornering. The automatic load leveling maintains consistent brake balance and prevents dangerous suspension bottoming that could cause loss of control. These factors combine to make these control valves critical safety components, not just comfort features.
Choosing genuine FAW 3515020-DY799WA valves over aftermarket alternatives ensures perfect compatibility and reliable performance. OEM valves are calibrated to work precisely with FAW’s suspension control algorithms and height sensors. Their flow characteristics, response times, and electrical specifications match the original design exactly. Aftermarket valves may have different flow rates or response characteristics that can cause uneven operation, system errors, or premature compressor wear. The genuine valves also come with proper sealing materials compatible with FAW’s air system components, preventing leaks that could develop with inferior aftermarket parts.
The 3515020-DY799WA valves support various specialized applications in FAW trucks. In dump truck configurations, they work with lift assist systems to maintain stability during loading and unloading. For tractor units, they facilitate fifth wheel height adjustment for proper trailer coupling. In refrigerated transport, they compensate for uneven weight distribution of cooling units. Understanding these specialized functions helps technicians properly diagnose and service suspension systems. The valves’ versatility across different configurations demonstrates their importance in FAW’s comprehensive vehicle design.
To ensure correct replacement, always use the OEM part number 3515020-DY799WA when ordering. While similar valves may appear interchangeable, subtle differences in port configuration, electrical connectors, or mounting brackets can prevent proper installation or operation. Providing your FAW truck’s VIN (Vehicle Identification Number) allows for precise parts matching, especially important as suspension systems may vary between model years and trim levels. Purchasing from authorized suppliers guarantees receipt of genuine components with proper packaging and documentation.
The FAW 3515020-DY799WA Rear Left And Right Air Control Valves are sophisticated components essential for modern air suspension performance. Their precise regulation of airflow maintains vehicle level, enhances ride quality, and contributes significantly to safety and stability. Regular maintenance and timely replacement with genuine OEM parts ensure these systems operate as designed, providing the benefits of air suspension throughout the vehicle’s service life. For FAW truck operators, understanding and properly maintaining these valves is key to achieving optimal vehicle performance, cargo protection, and driving comfort across all operating conditions.
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