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Brand: C.OEFT
OE numbers: 722.9
Product Name: Transmission Valve Body
Compatible model:
Product status: Remanufactured
Product weight:6.379KG
Packaging size: 63*41*36cm
Product packaging: Neutral Packaging
Car Series: Germany
Car Type: for BMW
1. Central Control of AT Hydraulic System
As the "hydraulic command core" of the Mercedes-Benz 722.9 AT transmission, the valve body precisely controls the flow direction, pressure, and flow rate of hydraulic oil through 28 sets of precision valves including built-in main pressure valves, shift valves, and lock-up control valves. When the TCU issues a gear shifting command, the valve body quickly switches the oil circuit (oil circuit response time ≤40ms), driving the torque converter lock-up clutch (lock-up timing can be dynamically adjusted according to working conditions, e.g., lock-up rate reaches over 95% during high-speed cruising) and planetary gear set clutches/brake bands to act, realizing precise 5-speed/7-speed shifting. It is a core component ensuring "power-interruption-free" transmission of the AT, guaranteeing smooth power transmission from the engine (e.g., M274, M276 engines) to the wheels and avoiding power jamming (e.g., low-speed shifting jerk) caused by gear shifting deviations.
2. Mercedes-Benz Exclusive Intelligent Gear Adjustment
It receives real-time data commands from the TCU (data transmission rate 1500kbps, complying with CAN FD protocol) and dynamically optimizes the gear adjustment strategy based on the transmission characteristics of the AT and the power needs of Mercedes-Benz models:
ECO Mode: Shifts up 200-300rpm in advance (e.g., shifts to 6th gear when vehicle speed is 60km/h), targeting the lowest engine speed (1500-2000rpm) to prioritize fuel efficiency.
SPORT Mode: Delays shifting by 300-400rpm, maintaining a high-speed range (3000-4500rpm). At the same time, it optimizes downshift response (e.g., completes 7-3 gear downshift within 1 second during rapid deceleration) to achieve "explosive" acceleration.
COMFORT Mode: Adopts "linear shifting logic", smoothly adjusting the shifting timing according to the throttle opening (e.g., shifts up in advance when the throttle is lightly pressed, and delays shifting when deeply pressed), balancing comfort and power.
1. Exclusive Adaptation for Mercedes-Benz AT Models, OEM-Level Precision Compatibility
As the core control component of the classic 5-speed/7-speed AT transmissions in Mercedes-Benz models (such as W204 C-Class, W212 E-Class, W164 ML-Class), the 722.9 transmission valve body is developed in strict compliance with Mercedes-Benz original technical specifications (DB 103 200). The tolerance of the valve plate oil passage diameter is controlled within ±0.02mm, and the spool stroke is fully synchronized with the transmission's torque converter and multiple planetary gear sets (e.g., Ravigneaux planetary carrier). Its interface specifications achieve seamless compatibility with Mercedes-Benz exclusive Transmission Control Unit (TCU, model such as NAG2).
Direct installation is feasible without additional modifications, effectively avoiding issues like oil leakage and gear shifting delay (e.g., 2-3 gear jitter) caused by non-adaptive valve bodies. This ensures the AT transmission regains the original "linear power output" characteristic, making it particularly suitable for scenarios such as replacing old valve bodies (for vehicles with over 150,000 km mileage) and troubleshooting repairs. After installation, stable operation can be achieved with only basic TCU learning and matching, perfectly meeting the needs of Mercedes-Benz after-sales maintenance and original replacement.
2. Precise Hydraulic Control for Multi-Gears, Enhanced AT Shifting Smoothness
Targeting the "high torque bearing and multi-gear synergy" characteristics of Mercedes-Benz AT transmissions, it adopts a combined design of 12 sets of high-precision proportional solenoid valves (PWM-controlled) and two-stage pressure regulating valves. It can real-time capture dynamic parameters such as engine torque, vehicle speed, throttle opening, and driving mode (ECO/SPORT/COMFORT), and fine-tune the hydraulic oil pressure with an accuracy of ±0.08MPa.
Compared with ordinary valve bodies, the gear shifting response speed is increased by 30%: the 7-speed version can complete smooth 2-7 gear shifts within 60-180 milliseconds, and the 5-speed version controls the shifting delay within 80-200 milliseconds, completely eliminating the "jerking sensation" during low-speed (20-40km/h) shifting. At the same time, through Mercedes-Benz exclusive "adaptive shifting logic", the engagement pressure curve of the planetary gear set clutches/brake bands is optimized (e.g., the clutch pressure rises linearly to 18-22MPa during startup), avoiding power interruption during shifting. Whether it is frequent start-stops in urban congested road conditions or 6-7 gear shifts during high-speed cruising (120km/h), a "shock-free" smooth driving experience is maintained, meeting the dual needs of high-end models for comfort and power smoothness.
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