I. Core Features

1. Ultra-High Flow Capacity: Optimized internal flow path design to handle flow rates up to 300 L/min, filling the gap between 03 series (70 L/min) and 06 series (500 L/min).
2. High-Pressure Rating: Maximum working pressure up to 35 MPa (350 Bar, 5076 PSI) for most valve types, ensuring reliable operation in heavy-duty hydraulic systems.
3. Pipeline-Free Connection: Stacked installation reduces oil leakage, vibration and noise issues, simplifies system construction, and improves overall reliability.
4. High Integration: Various functional modules can be freely combined, allowing quick construction of complex hydraulic circuits with flexible configuration options.
5. Easy Maintenance: The modular structure facilitates quick inspection, maintenance and replacement of individual valve components, reducing downtime.
6. Advanced Pressure Balance Structure: Adopted in throttle valves and flow control valves to ensure precise flow regulation even under high pressure and large flow conditions.
7. Wet Solenoid Technology: Used in solenoid directional valves (such as DSHG-04) to achieve high durability, low noise and stable operation under long-term high-pressure working conditions.
8. Reduced System Complexity: Ideal for systems where 03 series is insufficient but 06 series is oversized, optimizing system design and cost.

II. Product Types and Models

• F: Series Identification (indicating special seal for phosphate ester hydraulic fluid)
• MCP: Valve Type (Check Valve)
• 04: Valve Specification
• 3: Design Number (70 design for high-pressure large-flow models)
• 70: Special Seal Series Number (updated for higher pressure resistance and large flow compatibility)

III. Technical Specifications

IV. Typical Application Fields

1. Large-Scale Injection Molding Machinery: Precisely controls injection pressure and flow rate, adapting to extra-large-tonnage injection molding machines (over 1000 tons) and ensuring stable molding quality.
2. Heavy-Duty Press Machinery: Hydraulic systems of large hydraulic presses (over 2000 tons) requiring precise pressure and flow control for metal forming and stamping applications.
3. Metallurgical & Steel Mill Equipment: Hydraulic systems operating under high temperature and high pressure conditions in steel mills and metallurgical plants, such as hot rolling mills, cold rolling mills and continuous casting machines.
4. Heavy Construction Machinery: Hydraulic systems of large construction machinery, including large excavators (over 50 tons), crawler cranes and bulldozers, meeting high pressure and large flow requirements.
5. Ship and Offshore Equipment: Hydraulic systems for large ships and offshore platforms, including deck machinery, steering gear and cargo handling systems, with reliable performance under harsh working environments.
6. Mining Equipment: Hydraulic systems of large mining machinery, such as hydraulic shovels, loaders and drilling rigs, operating under extreme conditions with high power requirements.
7. Power Generation Equipment: Hydraulic control systems for large turbines, generators and other power plant equipment requiring precise control and high reliability.

V. Installation and Maintenance Points

1. Before Installation:
2. Clean hydraulic oil and pipelines thoroughly to prevent impurities from entering the valve body, which may cause component wear or blockage under high pressure and large flow conditions.
3. Check the condition of seals to ensure no damage; use special high-pressure resistant fluorine rubber seals when using phosphate ester hydraulic fluid or operating at pressures above 25 MPa.
4. Confirm that the mounting surface is flat, free of scratches or burrs, and the O-ring on the mounting surface is intact and compatible with high-pressure large-flow applications.
5. Ensure the hydraulic oil meets the required cleanliness level (NAS1638-12 class or cleaner) to prevent valve jamming or premature wear.
6. During Installation:
7. Stack valves in the order of the hydraulic principle diagram, paying attention to the direction of oil ports and ensuring correct alignment of each valve to avoid internal flow resistance issues.
8. Tighten bolts evenly with the specified torque (12~15 Nm) to avoid valve body deformation or oil leakage under high pressure and large flow.
9. For solenoid directional valves, pay attention to electrical connections and solenoid direction, and ensure compatibility with the system voltage (AC110V/220V or DC24V).
10. Ensure proper alignment of pilot lines for pilot-operated valves to maintain reliable operation under high pressure and large flow.
11. Use appropriate pipe size for the main oil lines to minimize pressure drop and ensure maximum flow capacity.
12. Maintenance:
13. Regularly check system pressure and flow rate to ensure normal operation; monitor for any abnormal noise or temperature rise which may indicate internal wear.
14. When adjusting pressure, first loosen the lock nut, rotate the adjusting bolt clockwise to increase pressure, and retighten the nut after adjustment; make small adjustments when working at pressures above 25 MPa.
15. If oil leakage or abnormal noise is found, promptly check seals and internal valve components, and replace worn parts in time to prevent system failure under high pressure and large flow.
16. Regularly replace hydraulic oil and filters according to the system requirements to maintain cleanliness and extend valve life; more frequent replacement is recommended for large-flow systems.
17. Avoid exceeding the maximum stacking layers (4 layers) when working pressure is above 25 MPa to ensure structural integrity and prevent oil leakage.

VI. Comparison with 01, 03 and 06 Series