252109467 multifunction valve for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Pneumatic Combination Valve Assembly
Part No.: 252109467
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Matching System: Air storage and brake pneumatic circuit
Valve Body Material: High-strength cast aluminum alloy
Integrated Functions: Pressure regulation, overpressure relief, one-way check, exhaust pressure relief
Transmission Medium: Compressed air from air compressor
Installation: Matches original air pipes, sealing washers and fixing bolts
Working Condition: Quarry mining, aggregate yard, heavy earthwork and construction projects
Inspection Items: Pressure calibration, air tightness test, on-off fatigue test, visual sealing inspection

Applicable Scenarios

It is installed in the pneumatic control circuit between air compressor and air tank of XCMG ZL50G and ZL50GL wheel loader, fixed on frame air circuit brackets, widely used in quarry, aggregate yard and earthwork construction sites.

▪ OEM mounting holes, port threads and preset pressure settings match original equipment for direct installation without recalibration
▪ Integrated multi-valve design reduces separate valves and joints, lowering leakage points and simplifying air circuit layout
▪ Lightweight cast aluminum valve body with good heat dissipation, vibration resistance and crack resistance for bumpy working conditions
▪ Accurate pressure control with automatic overpressure exhaust, preventing burst of air tank and pipes
▪ Built-in check valve blocks reverse airflow after shutdown, eliminating back load and extending air compressor service life
▪ Anti-aging internal seals resist dust and air impact, maintaining stable pressure setting without frequent drift
▪ Easy to disassemble and maintain, compatible with air tank, compressor, pipe fittings and gaskets of the same model
▪ Factory pressure calibration and air tightness inspection screen inaccurate or leaking units to keep stable brake air pressure

FAQ 

Q：Can I keep working if the exhaust port of combination valve leaks continuously?
A：Operation is not allowed. Continuous leakage leads to low tank pressure and non-stop compressor operation, which may cause insufficient brake pressure. Replace it immediately.

Q：What causes excessively high air pressure and frequent overpressure exhaust?
A：It is usually caused by fatigue failure of internal spring or diaphragm. The pressure control fails. Replace the whole assembly instead of partial repair.

Q：What should be noticed during installation?
A：Clean pipeline dirt before installation to avoid spool sticking. Do not over-tighten threads. Install new gasket and test pressure and leakage after assembly.

Q：Does fast pressure drop after compressor shutdown mean valve damage?
A：Check air tank and pipes for leakage first. If other parts are sealed well, the built-in check valve fails and the assembly needs replacement.

Q：What damage will water and sediment cause to combination valve?
A：Impurities and water scratch spool and damage diaphragm seal, resulting in sticking and leakage. Drain water from air tank regularly.

Q：How to store spare combination valve?
A：Store in dry and ventilated place. Seal all ports to prevent dust and moisture. Protect valve body and threads from impact damage.