measure valve seat for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Product Name: Metering Valve Seat
Part No.: None
Applicable Model: XCMG ZL50G, ZL50GL Wheel Loader
Matching Valve: D32 pilot multi-way valve
Material: Alloy structural steel, precision machined
Function: Accommodate metering spool, spring and seals, integrate metering orifice for balanced flow distribution
Nominal Port Size: 32mm
Medium: Anti-wear hydraulic oil for construction machinery
Working Temperature: -20℃ ~ +80℃
Inspection Items: Dimension inspection, passage crack detection, seal groove check, high-pressure sealing test, cycle durability test
Matching Parts: Metering spool, adjusting spring, O-rings

Applicable Scenarios

Installed in the metering valve assembly of D32 multi-way valve, it works with metering spool to balance flow for synchronized boom and bucket movement. Widely used in mines, sand yards, earthwork and cargo terminals.

• Machined according to original specification, matched passage and seal groove for accurate positioning and direct replacement without trimming
• High rigidity alloy base, resist deformation under repeated spring preload and alternating high-pressure shock
• Polished internal metering passages reduce turbulence and heat buildup, minimizing contaminant accumulation and spool jamming
• Smooth rounded seal groove prevents O-ring cutting, ensures tight sealing and avoids internal cross-flow
• Independent spare part design; replace only the seat instead of the whole valve section to cut maintenance expense
• Every unit passes crack detection and pressure test, stable batch quality with low on-site failure risk
• Fully compatible with original metering spool, spring and seals, simple assembly and short downtime
• Precise limiting step keeps spool aligned, stable metering accuracy and synchronized compound operation feel

FAQ 

Q：What symptoms occur when the metering valve seat is damaged?
A：Unbalanced flow during compound operation, out-of-sync boom and bucket movement, speed fluctuation under changing load, oil leakage and frequent spool sticking.

Q：Does unsynchronized compound movement always mean the metering seat is damaged?
A：No. Check metering spool, spring and O-ring leakage first. Confirm seat damage only after eliminating these faults.

Q：Can a lightly scratched seat groove be polished for long-term use?
A：Polishing is only for emergency. Modified groove profile leads to recurring leakage. New seat is recommended for formal overhaul.

Q：Can metering valve seat interchange with sequence or overload valve seat?
A：Not interchangeable. Passage layout, spring cavity depth and locating steps differ. Wrong assembly causes flow disorder and operation risk.

Q：What should be noted during disassembly and assembly?
A：Keep the circuit clean, protect mating surface, replace O-rings, and test flow balance after installation.

Q：What causes damage to metering valve seat?
A：Abrasive particles in hydraulic oil, long-term overpressure and careless scratching during maintenance are the main causes.