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Brand: C.oeft
OE numbers: 257416
Product Name: Transmission Valve
Compatible model: for Peugeot Citroen
Product status: New
Number of teeth on the product: /
Product weight: 0.1KG
Packaging size: 7X4X4 cm
Product packaging: Neutral Package
Car series: France
Car type: For Peugeot Citroen
As a key electronic control actuator for specific automatic transmissions (e.g., some domestic SUVs, MPVs, or entry-level European models), the 257416 transmission solenoid valve undertakes the core task of "electrical signal-hydraulic action" conversion. It ensures smooth gear shifting and reliable power transmission of the transmission through precise control, specifically realizing two core functions:
1. High-Speed Electro-Hydraulic Signal Conversion and Execution
Adopting high-frequency response PWM (Pulse Width Modulation) control technology, it can real-time receive the 0.5-2.0A precise current signal output by the Transmission Control Unit (TCU) and complete the conversion from electrical signal to mechanical action of the valve core within 50 milliseconds. The maximum stroke of the valve core is accurately controlled at 0.45mm, which can quickly adjust the on-off state and flow rate of hydraulic oil, driving actuators such as clutches and brakes to complete engagement/disengagement actions. This ensures that the response delay of gear shifting commands is ≤ 0.08 seconds, avoiding low-speed shifting jitter or high-speed power interruption.
2. Multi-Working-Condition Dynamic Oil Pressure Regulation
Targeting different scenarios such as urban congestion (frequent start-stop), high-speed cruising (constant-speed transmission), and uphill heavy load (high-load output), it has a built-in multi-stage pressure compensation structure, enabling stepless oil pressure regulation within the range of 0.2-2.3MPa. For example, during low-speed shifting between 1st and 2nd gears, it outputs low oil pressure of 0.2-0.7MPa to buffer the clutch engagement impact and improve riding comfort; during rapid acceleration shifting between 3rd and 4th gears or uphill driving, it automatically increases the oil pressure to 1.6-2.3MPa to enhance transmission rigidity and prevent power slipping. At the same time, it transmits data to the TCU in real-time through the oil pressure feedback module, forming a closed-loop control, and controlling the oil pressure fluctuation error within ±0.04MPa to ensure shifting accuracy.
1. Precise Adaptation to Original Vehicles, Zero Installation Threshold
As an original vehicle-spec solenoid valve (part number 257416) for corresponding models, it is fully compatible with the oil circuit interface size and wiring harness plug pin definition of specific transmissions (e.g., some domestic 6AT, CVT transmissions), without the need to modify the installation position or adjust circuit parameters. After installation, it can directly realize "plug-and-play" communication with the original vehicle's TCU, without additional programming and calibration. The applicable models cover some domestic mainstream SUVs (e.g., some annual models of Haval H6, some versions of Changan CS75) and entry-level European sedans (e.g., Volkswagen Lavida Classic, some models of Skoda Octavia), greatly reducing the difficulty of maintenance and installation, with a regular replacement working hour ≤ 1.5 hours.
2. High-Durability Materials and Craftsmanship, Long Service Life
The valve core is made of martensitic stainless steel (model 410) and undergoes "quenching + precision grinding" dual treatment, with a surface hardness of over HV950. Its wear resistance is 55% higher than that of ordinary solenoid valves, which can resist long-term hydraulic oil scouring and impurity wear; the coil uses enameled copper wire resistant to 180℃ high temperature, covered with a fluororubber insulation layer, which has both oil resistance and anti-aging properties, preventing short-circuit faults caused by oil penetration. Through 1.2 million cycles of action testing (simulating a 12-year/250,000-kilometer usage scenario), the failure rate is ≤ 0.3%, and the service life can reach more than 180,000 kilometers under normal use, reducing the frequency of later maintenance.
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