DHHD No‑OEM‑DHHD Check Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The DHHD Check Valve (Part # No‑OEM‑DHHD) is hydraulic one‑way valve for excavator hydraulic system. It blocks reverse oil flow, maintains loop holding pressure, protects other hydraulic components from reverse‑flow impact damage.

• Factory Wholesale Price: $72 – $135 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding treatment, anti‑abrasion, reliable one‑way sealing performance, long working lifespan
• 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 goods delivery

2. Application Scope

Designed for DHHD series excavator hydraulic circuit and engineering machinery maintenance:

• Hydraulic Overhaul: Direct replacement for worn, leaking or failed original check valve.
• Anti‑Reverse‑flow Protection: Stop hydraulic oil back‑flow, stabilize circuit holding pressure, protect related hydraulic parts.
• Repair Workshop: Good dimensional compatibility, easy installation, stable one‑way sealing effect.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Check Valve Failure Troubleshooting

• Fault 1: Poor Holding Pressure, Arm Sinking Phenomenon
  Cause: Valve core wear, sealing face dirt, spring fatigue deformation.
  Solution: Install new DHHD check valve, clean hydraulic oil circuit and replace filter element.
• Fault 2: Hydraulic Oil Reverse Flow, Component Abnormal Operation
  Cause: Sealing surface damage, foreign matter stuck inside valve.
  Solution: Fit DHHD No‑OEM‑DHHD check valve, clean the whole hydraulic loop after assembly.
• Fault 3: Abnormal Hydraulic Noise During Machine Operation
  Cause: Internal parts abrasion, unstable one‑way closing performance.
  Solution: Replace complete check valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Valve Connection Joint
  Cause: Sealing ring aging, thread 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 check valve fits my excavator?
A: Please confirm machine model, thread dimension and pressure parameter, provide part number No‑OEM‑DHHD for fast compatibility verification.

Q2: What quality tests are carried out before shipment?
A: Each DHHD check valve will pass hydraulic pressure and sealing test to guarantee reliable one‑way blocking performance.

Q3: What points need attention during installation?
A: Keep mounting position clean, avoid dirt entering valve interior, confirm oil flow direction before fastening installation.