DX28 Control Valve for Daewoo DH220-5-7 Excavator
2 month ago
Product details
I. Product Overview
TheDX28 control valveis a core component of the hydraulic system in theDaewoo (now Doosan) DH220-5-7 excavator. It regulates the flow and pressure of hydraulic oil to enable various excavator operations, such as traveling, digging, and swinging.
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II. Technical Specifications and Features
1. Model and Compatibility
• Model: DX28
• Compatible Excavator: Daewoo DH220-5-7
2. Hydraulic System Parameters
• Main Pump Maximum Flow: Up to2×212 L/min(may vary based on configuration). The DX28 valve must match this flow demand to ensure stable hydraulic system performance.
• Working Pressure:
• Main hydraulic circuit: Typically32.4 MPa
• Travel and swing hydraulic circuits: High-pressure resistance required for reliable operation.
3. Construction and Materials
• Body Material: High-grade alloy steel or other wear-/corrosion-resistant materials for long-term durability in harsh conditions.
• Key Components:
• Precision-machined valve spools and specially treated seals for enhanced control accuracy and minimal leakage.
• High-performance internal parts to reduce wear and extend service life.
4. Functional Characteristics
• Multi-way Directional Control: Simultaneously manages multiple hydraulic actuators for compound operations (e.g., digging while swinging).
• Advanced Control Features:
• Pressure compensation and flow control for rapid response and stability.
• Precise oil flow/pressure regulation to ensure accurate excavator movements under varying loads.
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III. Applications and Advantages
1. Applications
• Widely used inDaewoo DH220-5-7 excavatorsacross construction sites, mining operations, roadbuilding, and other heavy-duty scenarios.
• Enables critical functions: traveling, excavation, swinging, and loading through precise hydraulic control.
2. Advantages
• Efficient Operation: High responsiveness and control accuracy improve productivity and operational precision.
• Reliability: Robust construction ensures stable performance even in extreme conditions.
• Easy Maintenance: Modular design simplifies part replacement and reduces downtime.
1. Basic Information
Model：DX28 Multi-way Main Control Valve (Distribution Valve)
Applicable Machine：Daewoo/Doosan DH220-5、DH220-7 21Ton Crawler Excavator, also compatible with DH215-7/DH258-5/DH300-5
OEM Part No.：426-00064B / 410105-00079 / 2426-1223B
Net Weight：≈150kg~187kg | Origin: Korea Original / Domestic Replacement
2. Internal Spool Section Configuration
Integrated combined spool assembly, full independent valve sections:
1. Left Travel Spool Section
2. Right Travel Spool Section
3. Swing Rotation Spool Section (with swing priority valve)
4. Boom 1+Boom 2 Double Spool Section (Boom priority function built-in)
5. Arm 1+Arm 2 Double Spool Section (Arm flow regeneration & arm priority design)
6. Bucket Spool Section
7. Auxiliary Pipeline Spool Section (for break hammer optional)
3. Core Hydraulic Technical Parameters
1. System Rated Working Pressure: Main relief setting: 330bar; Boost peak pressure:350bar
2. Max Inlet Flow: Matched with K3V140DT twin main pump, total input flow 260L/min@2200rpm
3. Control Mode: Pilot hydraulic remote control (0.3~3.5MPa pilot pressure)
4. Oil Medium: ISO VG46 anti-wear mineral hydraulic oil; working temperature -20℃~+85℃
5. Oil Cleanliness Requirement: NAS 8~9 cleanliness grade
4. Key Functional Design & Working Principle
1. Boom Priority & Swing Priority Logic
- Boom priority: When boom lifting works together with arm/bucket/travel, preferentially allocate large pump flow to boom for fast lifting
- Swing priority: Preferential oil supply for rotary motor during composite operation, stable turning without speed drop
2. Arm Regeneration Circuit
Built-in arm return oil regenerative valve; arm retracting reuse rod chamber return oil into rodless chamber, reduce pump oil supply, save fuel & improve arm retraction speed
3. Dual-pump Confluence & Independent Split Flow
- Single action: Double pump confluence for high speed;
- Multi composite action: Two pumps separate oil supply to different actuators to realize synchronous multi-action of boom+arm+travel+swing
4. Built-in Overload Protection
Each actuator port equipped with independent overload relief valve for cylinder/motor overload anti-damage; central main relief valve limits full-system maximum pressure
5. Anti-drop Holding Valve
Integrated boom & arm counterbalance holding valve to prevent natural falling of boom/arm under self-weight when machine stops operation
5. Structural Features
1. Integral cast ductile iron valve body, precision ground spool, low internal leakage, high pressure resistance
2. Compact modular integrated layout, easy maintenance for single spool replacement without full valve disassembly
3. All main spools with fine damping groove for cushioned shifting, reduce hydraulic shock & operating vibration
4. Standard original port layout, fully interchangeable with OEM original valve, direct bolt-on replacement without pipeline modification
6. Application Range
Main hydraulic distribution core for Doosan DH220-5 / DH220-7 21ton excavator, widely used in earthmoving, stone excavation, demolition, construction site loading & digging operation.
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