Dongfeng GX Height valve assembly 2938010-TS800

As a core component of the air suspension system, this assembly features real-time load-adaptive height adjustment to maintain a stable vehicle ride height regardless of cargo weight. It is pre-calibrated to maintain a target ride height range of 350 - 400mm (measured from the axle to the frame) and automatically adjusts air pressure in the suspension airbags within 0.3 - 0.8 MPa. When the vehicle is loaded (increasing axle load), the valve opens to inflate the airbags, raising the vehicle back to the target height; when unloaded (decreasing axle load), it releases excess air to lower the vehicle, preventing over-inflation of airbags. This function not only ensures consistent ground clearance for auxiliary equipment (e.g., dump truck lift mechanisms) but also improves tire contact with the road, reducing uneven tire wear.

To enhance the safety of the air suspension system, the assembly adopts a dual-circuit air supply design that separates the front and rear suspension air circuits (or left and right circuits, depending on the vehicle configuration). In the event of a leak in one circuit, the other circuit remains functional, preventing sudden vehicle height loss and ensuring basic driving stability. Additionally, it integrates an overpressure protection valve that automatically vents air when the system pressure exceeds 0.9 MPa, protecting airbags, air hoses, and other components from damage caused by excessive pressure. A one-way check valve is also included to prevent reverse air flow, maintaining stable pressure in the airbags during temporary air supply interruptions.

Built to withstand the harsh operating conditions of heavy-duty trucks (e.g., vibration, dust, moisture, and temperature fluctuations), the assembly utilizes high-performance materials and protective structures. The valve body is made of die-cast aluminum alloy (ADC12) with a hard anodized surface treatment (thickness ≥15μm), providing excellent corrosion resistance (passing 480-hour salt spray testing per ASTM B117) and mechanical strength to resist impact and vibration. The internal valve core is crafted from precision-machined stainless steel (304 grade) for wear resistance, while the seals are made of HNBR (hydrogenated nitrile butadiene rubber) that resists oil, ozone, and high temperatures. The assembly can operate stably within a temperature range of -40°C to +120°C and withstand continuous vibration (10 - 2000Hz, 15g acceleration), ensuring reliable performance in diverse climates and road conditions.

This height valve assembly meets strict domestic and international standards for automotive air suspension components. It complies with GB/T 23914 (China National Standard for Air Suspension Height Control Valves), ISO 10882-1 (International Standard for Commercial Vehicle Air Suspension Systems), and Dongfeng’s internal Q/DF 035-2024 standard for heavy-duty truck air suspension parts. Each unit undergoes rigorous factory testing, including: a 10,000-cycle height adjustment test (to verify response accuracy), a 500-hour continuous operation test (to check stability), a seal performance test (with a leak rate of ≤1×10⁻⁶ Pa·m³/s), and a low-temperature start-up test (at -40°C). These certifications ensure the assembly’s safety, reliability, and compatibility with both domestic and international markets, making it suitable for Dongfeng GX trucks operating in various regions.