Dongfeng KL truck parts Warm air inlet valve assembly 8101170-C3100

Designed to regulate coolant flow into the warm air core (the heart of the truck’s heating system), the valve features a step-less electronic control mechanism driven by a 12V/24V DC servo motor. It adjusts the internal valve plate opening (0–100%) based on signals from the HVAC controller, precisely matching coolant flow to the driver’s desired cabin temperature. For example, when the cab needs rapid heating (e.g., cold starts), the valve opens fully to maximize coolant flow (up to 8 L/min), enabling the warm air core to reach operating temperature in 3–5 minutes; when the target temperature is reached, it reduces the opening to 20–30% to maintain steady heat, avoiding overheating. Unlike manual valves that require constant adjustment, this electronic precision control ensures consistent cabin warmth (±1°C of the set temperature) and reduces unnecessary engine coolant diversion, improving fuel efficiency by 3–5% in winter

Built to withstand the harsh conditions of engine coolant systems—including high temperatures, pressure, and chemical corrosion—the valve assembly uses premium, purpose-engineered materials. The valve body is made of die-cast aluminum alloy (ADC12) with a corrosion-resistant electrophoretic coating, which resists pitting or degradation from ethylene glycol-based coolants (common in truck systems) and endures temperatures up to 130°C. The internal valve plate is crafted from stainless steel (304 grade) that maintains rigidity and seal integrity even after 100,000+ opening/closing cycles. The servo motor’s housing is made of heat-resistant PA66 plastic reinforced with 20% glass fiber, protecting internal components from engine bay heat and vibration. Unlike plastic valves that warp or metal valves that rust, this material combination ensures the assembly operates reliably for 400,000+ km in winter conditions

Engineered to maintain the integrity of the engine’s cooling system, the valve assembly integrates a multi-layer sealing design that eliminates coolant leaks—a critical issue that can cause engine overheating or cabin heating failure. The inlet/outlet pipe connections feature double O-rings (made of EPDM rubber, 70 Shore A hardness) that create a leak-tight seal with the coolant hoses, withstanding system pressure up to 1.5 MPa (exceeding Dongfeng KL’s maximum coolant pressure of 1.2 MPa). The valve plate’s sealing surface is coated with a PTFE-based composite layer that ensures airtight closure when the valve is fully shut, preventing even minimal coolant bypass. Additionally, the valve body’s mating surfaces are precision-machined to a flatness of ≤0.05mm, ensuring full contact with gaskets and eliminating gaps. Unlike single-seal valves that leak after short use, this multi-layer design undergoes a 24-hour pressure test (1.5 MPa) before leaving the factory, guaranteeing zero leakage

The assembly prioritizes system safety and seamless integration with Dongfeng KL’s HVAC system. It includes a built-in fail-safe mechanism: if the servo motor loses power (e.g., electrical fault), the valve defaults to a 50% open position—ensuring a minimum level of coolant flow to the warm air core, preventing complete cabin heating loss in cold weather (a critical safety feature for drivers in freezing regions). The valve’s electrical connector is sealed to IP67 standards, blocking dust and moisture from entering the motor circuit and causing short circuits. It also communicates with the HVAC controller via a PWM signal, enabling real-time feedback on valve position—allowing the controller to adjust flow dynamically and alert the driver to valve malfunctions (via dashboard warning lights). Each unit undergoes strict testing: temperature cycling (-40°C to 130°C), vibration testing (10–2,000 Hz), and durability cycling (100,000 open/close cycles). Backed by a 24-month warranty against manufacturing defects (e.g., valve sticking, seal failure, motor malfunction), it provides Dongfeng KL truck owners with a reliable, safe solution for winter cabin heating