DH55 No‑OEM‑DH55 Auxiliary Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The DH55 Auxiliary Relief Valve (Part # No‑OEM‑DH55) is the hydraulic sub‑valve for excavator hydraulic branch circuit. It completes branch‑circuit over‑pressure protection, stabilizes partial hydraulic pressure and protects distribution valve and hydraulic actuators from pressure‑impact damage.

• Factory Wholesale Price: $72 – $142 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding, anti‑wear property, stable pressure output, long working service cycle
• MOQ & Bulk Discount: 1 Unit, favorable price for bulk maintenance orders
• Lead Time: 1‑3 working days, adequate stock supports worldwide logistics shipment
• Warranty: 12‑month replacement warranty, full hydraulic pressure test completed before delivery

2. Application Scope

Specially matched for DH55 excavator hydraulic system and engineering machinery maintenance:

• Hydraulic Overhaul: Direct replacement for worn, stuck or invalid original auxiliary relief valve.
• Branch‑circuit Pressure Protection: Control branch hydraulic pressure, protect distribution valve and hydraulic actuators against over‑pressure impact damage.
• Repair Workshop: Excellent dimensional compatibility, simple installation, stable pressure‑regulating performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Auxiliary Relief Valve Failure Troubleshooting

• Fault 1: Single‑function Weak Action, Slow Movement Speed
  Cause: Spool wear, internal impurity clogging, spring fatigue deformation.
  Solution: Install new auxiliary relief valve, clean hydraulic oil circuit and replace filter element.
• Fault 2: Partial Hydraulic Circuit Over‑pressure, Damage To Hydraulic Components
  Cause: Valve core stuck, pressure control function failure.
  Solution: Fit DH55 No‑OEM‑DH55 auxiliary relief valve, calibrate branch‑circuit pressure to standard value after assembly.
• Fault 3: Abnormal Hydraulic Noise & Vibration During Operation
  Cause: Internal parts abrasion, unstable overflow pressure.
  Solution: Replace complete valve assembly, check hydraulic oil cleanliness status.
• Fault 4: Oil Leakage At Valve Thread Connection Position
  Cause: Sealing ring aging, thread surface scratch damage.
  Solution: Change whole valve or matching seal repair kit.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this auxiliary relief valve fits my excavator?
A: Please verify machine model, thread size and pressure parameter, provide part number No‑OEM‑DH55 for fast compatibility check.

Q2: What quality tests are carried out before shipment?
A: Each DH55 auxiliary relief valve passes hydraulic pressure test to ensure stable overflow and pressure‑holding performance.

Q3: What should be noticed during installation?
A: Keep mounting area clean to prevent dirt entering valve interior, calibrate branch‑circuit hydraulic pressure strictly after installation.