press choosing valve for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Pressure Selector Valve
Part No.: None
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Valve Body Material: Cast aluminum alloy
Structure Type: Shuttle type pressure selection
Function: Select higher pressure from two inputs and output feedback signal
Medium: Construction machinery hydraulic oil
Working Temperature: -20℃ ~ +80℃
Inspection Items: Pressure response test, sealing test, cycle durability test, visual inspection
Matching Circuit: Pilot control oil circuit

Applicable Scenarios

It is integrated in the loader pilot hydraulic circuit to collect boom and bucket pilot pressure signals and send feedback to load-sensing multi-way valve, ensuring smooth compound actions of shoveling, lifting and unloading. Widely used in high-frequency working scenarios such as sand yards, mines, earthwork sites and cargo yards.

• Original ports and mounting dimensions, perfect fit without pipe reworking or bracket adjustment. Direct replacement reduces assembly error
• All-mechanical shuttle design, no electronic components, anti-vibration and anti-electromagnetic interference, stable in dusty construction environments
• Precisely mated steel ball and seat, fast switching and continuous signal transmission, avoid intermittent operation
• Lightweight high-strength cast aluminum body, good oil and corrosion resistance, not easy to rust under muddy and oily conditions
• Premium oil-resistant seals, resist aging caused by fluctuating oil temperature, reduce internal leakage and drifting operation feel
• Simple structure and easy disassembly. No need to disassemble main hydraulic valve, greatly cut downtime and production loss
• Strict original pressure selection logic, independent signal identification without cross-interference, ensure smooth coordinated compound movements

FAQ 

Q：What symptoms appear when pressure selector valve fails?
A：Disordered pilot pressure signals, unstable movement speed, abnormal linkage between boom and bucket. Operation delay and variable joystick resistance may occur. In severe cases, no movement responds when operating the lever, and compound shoveling cannot work normally.

Q：Where does oil leakage usually occur?
A：Most leakage occurs at threaded port connections due to damaged or aged O-rings. A small amount of leakage appears at the mating surface of valve body. It is not recommended to repair the body leakage, replace the whole assembly.

Q：Can I adjust pressure on this valve?
A：This valve only compares and selects pressure signals without pressure adjustment structure. The output pressure is determined by upstream pilot valve and cannot be adjusted on this unit.

Q：Can different pressure selector valves be interchanged?
A：Interchange is not recommended. Different models differ in port size, seat dimension and port angle. Wrong installation will lead to signal failure and disordered control, bringing operation risks.

Q：How to judge whether the valve is damaged?
A：Test two input pilot pressures with pressure gauge first. If input pressure is normal, circuit is free of air and blockage, but output signal remains abnormal, the shuttle valve is stuck or sealed out, replace the assembly.