I. Product Overview
The DB10 is a pilot-operated relief valve primarily used in hydraulic systems to achieve pressure control through the coordinated operation of the main valve and pilot valve. Its core functions include:
• Pressure Regulation and Relief: Maintains stable system pressure and prevents overpressure.
• System Unloading: Releases system pressure when required to protect equipment safety.
• Overload Protection: Automatically opens to relieve excess pressure when system pressure exceeds the set value, preventing equipment damage.
II. Structure and Working Principle
1. Structural Components:
• Main Valve: Includes a main valve spool, valve sleeve, and return spring, responsible for relieving large hydraulic oil flows.
• Pilot Valve: Comprises a poppet valve and pressure-adjusting spring, used for precise pressure sensing and controlling the main valve's opening.
• Orifice: Located on the main valve spool, it creates a pressure differential through fluid resistance to assist in main valve opening.
2. Working Principle:
• Pressure Sensing: System pressure oil enters the upper chamber of the main valve through the orifice and acts on the pilot valve poppet.
• Pilot Valve Actuation: When system pressure exceeds the pilot valve spring's set value, the poppet opens, allowing pressure oil from the main valve's upper chamber to drain. This causes the main valve spool to lift.
• Relief Process: Once the main valve opens, excess hydraulic oil is relieved back to the tank through the main valve port. When system pressure drops below the set value, the main valve closes.
III. Technical Features
1. High-Precision Pressure Control:
• The pilot valve achieves sensitive pressure feedback through the coordinated action of the poppet valve and spring, ensuring stable system pressure.
• The main valve spring is only used for resetting, reducing the operating force of the pressure-adjusting mechanism for lighter and more precise manual pressure adjustments.
2. High Flow Capacity:
• The internal flow path is optimized for strong flow capacity, suitable for high-flow applications.
• The maximum operating pressure can reach 31.5 MPa, meeting the needs of medium- and high-pressure hydraulic systems.
3. Low Noise and Long Service Life:
• The nozzle-orifice design balances the pressure differential across the main valve spool, reducing hydraulic shock and vibration, thereby lowering noise levels.
• Both the main valve and pilot valve are made of wear-resistant alloy materials to ensure long-term sealing performance.
4. Modular Design:
• Supports various control oil circuit combinations, such as internal supply/internal drain and external supply/external drain, facilitating system integration and maintenance.
• The split design allows for easy installation and maintenance, with low space requirements, enabling flexible adaptation to various hydraulic station layouts.
IV. Application Areas
The DB10 is widely used in the following scenarios:
• Construction Machinery: Such as excavators and loaders, for overload protection and pressure stabilization control.
• Metallurgical Equipment: Such as rolling mill hydraulic systems, for precise pressure control to ensure stable equipment operation.
• Injection Molding Machines: For cavity pressure control to improve product quality.
• Marine Hydraulic Systems: Such as hydraulic steering gears, to ensure safe navigation.
• Wind Power Equipment: Such as braking systems, to prevent equipment overload.
V. Performance Advantages
1. Pressure Stability: Pressure fluctuation ≤ ±0.5% under rated flow conditions.
2. Response Speed: Full-stroke actuation time < 50 ms, enabling rapid response to pressure changes.
3. Leakage Control: Internal leakage < 5 mL/min under maximum pressure, reducing energy loss.
4. Service Life: Over 1 million cycles under standard test conditions.
VI. Operation and Maintenance
1. Pressure Adjustment:
• Adjust the system pressure by rotating the pressure-adjusting screw on the pilot valve to change the pilot valve spring's preload.
• Adjust slowly to avoid pressure shocks to the system.
2. Maintenance Recommendations:
• Regularly check the cleanliness of the hydraulic oil to prevent contaminants from entering the valve body and causing wear or blockage.
• Ensure that the new oil meets mineral-based hydraulic oil standards when replacing hydraulic oil, with an operating temperature range of -20°C to 80°C.
• If valve body leakage or abnormal pressure is detected, promptly inspect or replace seals
