803004077 in-linecheck valve for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Part Number：803004077
Product Name：Check Valve
Applicable Model：XCMG ZL50G, ZL50GL Wheel Loader
Material：Alloy steel forged valve body, alloy steel poppet spool
Sealing Parts：Nitrile rubber seal ring
Cracking Pressure：Standard opening pressure
Rated Working Pressure：Hydraulic system working pressure
Working Medium：L-HM46 anti-wear hydraulic oil
Working Temperature：-20℃ ~ 80℃
Connection Form：Thread connection
Inspection Items：Dimensional inspection, thread inspection, reverse sealing test, flow characteristic test, appearance inspection

Applicable Scenarios

It is used for pressure maintaining and backflow prevention of hydraulic oil circuit, oil cylinder holding circuit and cooling auxiliary circuit of 5-ton wheel loader, suitable for earthwork, quarry, sand yard and port bulk cargo loading and unloading conditions.

• Produced according to OEM standards, thread and oil port size are consistent with original valve for direct replacement without modification.
• Poppet hard seal structure, good sealing performance, low reverse internal leakage and stable pressure holding effect.
• Alloy steel forged valve body, dense material, high pressure resistance, resistant to frequent pressure impact.
• Precise grinding matching between spool and valve seat, stable performance and long service life.
• Small flow resistance in forward direction, little pressure loss, and little influence on system flow supply.
• Compact structure, easy installation and disassembly, convenient for pipeline maintenance.
• Strict factory sealing and pressure test, stable batch quality, easy spare parts stocking.

FAQ 

Q: Can this check valve be installed reversely?
A: Absolutely not. Reverse installation will completely block the forward oil flow, the hydraulic actuator cannot work normally, and the whole hydraulic system loses power.

Q: What are the common causes of check valve failure?
A: Common faults include foreign particles stuck between spool and valve seat, spring fatigue fracture, sealing surface scratch, aging and failure of sealing ring.

Q: What should be checked before installation?
A: Check the valve body for cracks and damage, confirm that the thread is intact, clean the sundries in the oil port to prevent impurities from entering the valve cavity.

Q: What phenomenon will occur if the check valve leaks seriously in reverse direction?
A: The system cannot maintain pressure, the load will slowly sink, the oil cylinder will retract automatically, and the operation safety risk increases.

Q: What influence will oil pollution bring to the check valve?
A: Hard impurities in hydraulic oil will scratch the sealing cone surface of spool and valve seat, resulting in poor sealing and permanent leakage.

Q: Can I disassemble the check valve for cleaning by myself?
A: It can be disassembled and cleaned if you have professional maintenance experience. It is necessary to strictly prevent mixed sundries during assembly; if the sealing surface is scratched, replace it directly.