Pneumatic Lock Valve Assembly

1. Basic Part Information

• Part Name: Pneumatic Lock Valve Assembly (commonly known as "pneumatic control valve" or "pneumatic lock valve")

• Part Number: WG2203250010

• Main Body Structure: Black housing, typically made of aluminum alloy or high-strength engineering plastic, containing internal mechanical structures such as a valve core and springs.

• Air Line Ports: Three metal air ports (barbed fittings) at the bottom for connecting to the air reservoir, transmission double H valve (shift cylinder), and atmospheric circuit.

• Control End: A large cylindrical protrusion on top, typically housing the solenoid coil or pneumatic pilot control port.

• Markings: The side is marked with "JT2203250010" (manufacturer code or batch number), "出水 9/2025/04/14" (production date or water test date), as well as "RZ" and certification marks.

2. Applicable Models & Installation Position

• Applicable Models: Mainly suitable for Sinotruk HOWO series heavy-duty trucks, such as HOWO A7, T7H, T5G, and other models.

• Compatible Transmissions: Specifically designed for Sinotruk 10-speed transmissions (HW19710L) and 12-speed transmissions (HW19712L).

• Installation Position: Mounted on the side of the transmission housing or on the frame rail. It is an important component of the transmission pneumatic control system, typically used in conjunction with the "double H valve."

3. Main Functions & Role

• Pneumatic Shift Control: This valve is the core control element of the pneumatic shift system. It receives electrical (or pneumatic) signals from the shift lever in the cab, controlling the direction of compressed air flow to actuate the double H shift mechanism inside the transmission, thereby achieving upshifts or downshifts.

• Locking Function: During vehicle operation, this valve ensures the transmission remains stably in the current gear, preventing accidental gear jumping or disengagement, thus improving driving safety.

• Air Circuit Switching: By enabling or disabling different air lines, it facilitates switching between forward gear, neutral, and reverse gear.