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SINOTRUK HOWO TRUCK WABCO Proportional Valve WG2203080020+025
FUNCTION
1. Pneumatic-Electronic Proportional Control: When the driver actuates the retarder lever located beneath the steering wheel, the vehicle's ECU transmits a variable-magnitude current signal to the valve, based on the selected gear. The spool valve within the solenoid valve responds precisely to the magnitude of this current, proportionally regulating high-pressure air-supplied from the vehicle's main air reservoir-to generate and output a precise target control pressure.
2. Air-over-Oil Actuation: The precise air pressure output by this valve flows into the retarder's control valve, subsequently driving the working fluid into the space between the retarder's rotor and stator. The greater the volume of fluid introduced, the larger the braking torque generated, resulting in a stronger braking effect. This mechanism enables the truck to maintain a constant speed and achieve smooth, stepless deceleration.
3. Integrated Braking and Cruise Control: When the vehicle is descending a long gradient with cruise control engaged, or when the driver lightly applies the service brake, the ECU automatically assumes control of the proportional valve. Eliminating the need for manual operation of the main retarder lever, the valve works in seamless coordination with both the engine exhaust brake and the vehicle's service brakes.
4. Rapid Pressure Release and Reset: When the driver releases the retarder lever or depresses the accelerator pedal to increase speed, power to the solenoid valve coil is instantly cut off. The working fluid within the retarder's internal chamber rapidly drains back into the oil sump, ensuring the retarder immediately disengages and the vehicle returns to a state of unimpeded forward motion.
DETAILS
| DESCRIPTION | Proportional Valve | PART NUMBER | WG2203080020+025 |
| WEIGHT |
0.5 kg |
VOLUME | 110 mm × 65 mm × 60 mm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | GEARBOX |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Symptoms and Maintenance Tips
1. Complete Retarder Failure: Upon engaging the retarder lever located beneath the steering wheel, the vehicle exhibits absolutely no deceleration; the instrument cluster may display a retarder fault code.
2. Failure of Stepless Braking Control: When engaging or disengaging the retarder, braking intervention is extremely abrupt (preventing light braking-full braking force is applied immediately upon activation), or the braking force output feels weak and ineffective.
3. Pneumatic System Leakage: Intermittent or continuous air leakage is observed at the exhaust port of the proportional valve.
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