Yuchai engine spare parts Antifreeze solenoid valve YC6MK420-50MX100-1205740

Built to regulate the antifreeze flow in YC6MK420-50 engines with exceptional precision, this solenoid valve features a direct-acting structural design that ensures rapid response. It achieves full opening or closing within 50ms of receiving ECU signals, effectively controlling the coolant flow rate to the heater core or bypass circuit. The valve’s nominal flow rate of 15L/min at 0.3MPa ensures sufficient antifreeze supply for engine preheating in cold weather and rapid cooling during high-load operation. The integrated magnetic coil (copper wire winding, 1000 turns) generates stable electromagnetic force, maintaining consistent on-off performance even with voltage fluctuations (10.8V-13.2V). This precise control helps maintain the engine’s optimal operating temperature (82℃-90℃), reducing fuel consumption by 3-5% and extending engine life

Engineered to endure the harsh environment of engine coolant systems, the valve exhibits exceptional resistance to high temperatures and pressures. The valve body is made of brass (H62 grade) with a high-temperature ceramic seal, capable of operating continuously at 120℃ (maximum intermittent temperature 150℃)—adapting to the peak coolant temperature of YC6MK420-50 engines. It withstands a maximum working pressure of 1.2MPa (174psi) and passes 100,000 pressure cycle tests (0.1MPa-1.0MPa) without leakage or deformation. The magnetic coil’s insulation layer uses high-temperature resistant epoxy resin (class H insulation), preventing breakdown at high engine bay temperatures. This robustness ensures reliable operation even during long-term high-load driving (e.g., mountain climbing, heavy hauling)

Designed with a multi-layer sealing structure, the valve effectively prevents antifreeze leakage—a critical issue for engine cooling systems. The inlet/outlet connections use nitrile rubber O-rings (shore hardness 75±5) with a double-lip design, forming a tight seal against the coolant manifold. The valve stem is equipped with a PTFE (polytetrafluoroethylene) seal ring that reduces friction and maintains sealing performance after 100,000 on-off cycles. A metal gasket between the valve body and flange further enhances sealing, while the brass material resists corrosion from ethylene glycol-based antifreeze (common in Yuchai engines). In leakage tests, the valve shows no measurable leakage (≤0.1mL/min) at 1.0MPa working pressure, ensuring the coolant system’s integrity and preventing engine overheating

Optimized for efficient engine maintenance, the valve features a user-friendly design that reduces installation and service time. The 4-bolt mounting flange uses M8×20 galvanized bolts (grade 8.8) that match the engine’s original mounting holes, requiring only a torque wrench (20-25N·m) for fixation. The pre-wired harness (150mm length) includes a weatherproof connector (AMP Superseal 1.5 series) that plugs directly into the engine’s ECU, eliminating on-site wiring. The valve’s compact dimensions (120mm×80mm×60mm) fit easily in the engine bay’s limited space. It requires no regular maintenance—thanks to the wear-resistant ceramic seal and brass valve body—and comes with a 1-year/100,000km warranty. Clear labeling (“INLET”/“OUTLET”) prevents reverse installation, allowing a single technician to complete replacement in 30 minutes or less