Excavator overflow valve DH220-5 auxiliary valve
2 month ago
Product details
Basic Information
Applicable Machine: Doosan DH220-5, DH200-5, DH220-7, DH225-7 Excavator
Common Part Numbers: 14552089, 7242-11580, 2420-1226
Other Name: Overload Relief Valve / Branch Relief Valve
Function: Limits maximum working pressure of individual actuators (boom, arm, bucket, travel, swing) for overload protection and stabilizes pressure during combined movements.
Installation Position: Installed on each service port of main control valve; cartridge threaded construction.
Core Technical Parameters
- Standard set pressure: 280~300 bar (factory preset at 290 bar normally)
- Maximum allowable working pressure: 350 bar
- Thread specification: M24×1.5 standard cartridge thread
- Approximate weight: 450 g
- Seal: NBR nitrile rubber, operating temperature: -20℃ ~ +100℃
- Material: Poppet & valve sleeve: quenched steel; valve body: high-strength alloy steel
Distinction between Main Relief Valve and Auxiliary Relief Valve
- Main Relief Valve (Main system relief): Part No.2420-1225A, controls overall system pressure: 355 bar (pilot off) / 380 bar (pilot on)
- Auxiliary Relief Valve: Part No.14552089, separate circuit protection against single-circuit overload
Working Principle
1. Normal working status: Valve closed, hydraulic oil flows directly to actuators.
2. Overload condition: Poppet lifts once circuit pressure exceeds preset value, excess oil drains back to tank to cap pressure and protect cylinders, hoses and hydraulic pumps.
3. Pressure stabilization: Absorbs pressure spike during compound movements to avoid operation interference.
Common Malfunction & Phenomenon
1. Low set pressure: Slow movement, insufficient output force and frequent overflow (caused by weakened spring or worn poppet).
2. Poppet stuck closed: Engine lugging under high load, pipeline vibration and excessive oil temperature (caused by contaminated hydraulic oil or stuck spool).
3. Internal leakage: Function drifting and high oil temperature (caused by aged O-rings or damaged valve seat).
Installation & Pressure Adjustment
- Recommended tightening torque: 45~50 N·m
- Adjustment rule: Clockwise = increase pressure; Counter-clockwise = decrease pressure; standard setting: 290 bar.
I. Overview of DH220-5 Excavator
The DH220-5 is a crawler excavator under the Doosan brand. It utilizes traditional power and features a backhoe bucket configuration, with a product tonnage of 22 tons. This model enjoys a certain level of popularity and widespread application in the market. Its hydraulic system is complex and precise, incorporating several key hydraulic components, such as the main valve, auxiliary valve (which may include relief valves), hydraulic pumps, and hydraulic motors.
II. Auxiliary Valve (Potentially Including Relief Valves) of DH220-5 Excavator
1. Function of the Auxiliary Valve
• In the hydraulic system of an excavator, the auxiliary valve typically serves to assist the main valve in distributing hydraulic oil, regulating pressure, and controlling flow.
• As a type of auxiliary valve, the relief valve is primarily used to control the maximum pressure in the hydraulic system, preventing system overload and protecting hydraulic components from damage.
2. Characteristics of the Relief Valve
• Pressure Regulation: The relief valve can adjust the outlet pressure according to system requirements, maintaining stable system pressure.
• Overload Protection: When the system pressure exceeds the set value, the relief valve opens, allowing some hydraulic oil to flow back to the tank, thereby reducing system pressure and preventing overload.
• Flow Control: In certain cases, the relief valve can also be used to control the flow rate of the hydraulic system to meet the needs of different working conditions.
3. Potential Configuration of the Auxiliary Valve (Relief Valve) in DH220-5 Excavator
• The auxiliary valve (potentially including relief valves) of the DH220-5 excavator is typically integrated into the hydraulic control valve group, working in conjunction with the main valve, hydraulic pump, and other components.
• Specific configurations may vary depending on the excavator model, manufacturer, and configuration options.
III. Maintenance and Care of the Auxiliary Valve (Relief Valve) in DH220-5 Excavator
1. Regular Inspection: Regularly inspect the working condition of the auxiliary valve (relief valve), including the accuracy of pressure regulation and the integrity of sealing performance.
2. Cleaning and Maintenance: Keep the auxiliary valve (relief valve) and its surrounding environment clean to prevent impurities from entering the valve body and affecting its performance.
3. Timely Replacement: If any leakage, jamming, or other fault phenomena are detected in the auxiliary valve (relief valve), replace it promptly to ensure the normal operation of the system.
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