With advantages of compact structure, high pressure resistance and long service life. The HSSD8 sectional hydraulic valve has two hydraulic systems: open center and closed center. Each valve body can be added with a relief valve, a supplement valve and a combination valve according to customer requirements. The control methods include manual control, pneumatic control, electro-hydraulic control, solenoid control, electro-pneumatic control, joystick control, and remote control, etc., which can meet the different control needs of customers. The valve is widely used in hydraulic systems of construction machinery, environmental sanitation machinery, mining machinery, agricultural machinery and other types of machinery.
SD5 Series Monoblock Direction Control Valve
1. Product Overview
The SD5 Series Monoblock Direction Control Valve is an integrated hydraulic control component designed specifically for small- to medium-sized hydraulic systems. Its core features include a monoblock structure that achieves multifunctional hydraulic circuit control, making it suitable for applications in construction machinery, agricultural equipment, industrial automation, and more. It offers high reliability, a compact design, and ease of maintenance.
2. Key Features and Technical Advantages
• Monoblock Integrated Design
• Integrates functions such as directional control, throttling, and pressure relief into a single valve body, reducing piping connections and minimizing leakage risks.
• Modular structure supports customizable function expansions (e.g., stackable valves, pressure compensation valves).
• High-Precision Control
• Utilizes precisely machined valve spools and sleeves for low friction and high responsiveness.
• Supports proportional or on/off control to adapt to various load requirements.
• Durability and Reliability
• Valve body constructed from high-strength cast iron or aluminum alloy for strong impact resistance.
• Seals made from fluororubber or polyurethane materials resistant to high temperatures and wear, extending service life.
• Environmental Adaptability
• Operating temperature range: -20°C to +80°C (low-temperature models available).
• IP65 protection rating for dust and water resistance, suitable for harsh working conditions.
3. Technical Specifications
【表格】
Parameter Specification Range
Maximum Working Pressure 350 bar (standard) / 400 bar (high-pressure models)
Rated Flow Rate 20–120 L/min (varies by model)
Actuation Method Manual, solenoid, hydraulic pilot, pneumatic
Spool Type O-type, P-type, Y-type, M-type (customizable)
Port Size G1/4 to G1 (standard) / NPT optional
4. Applications
• Construction Machinery: Hydraulic systems for excavators, loaders, and cranes.
• Agricultural Equipment: Hydraulic controls for tractors, harvesters, and irrigation systems.
• Industrial Automation: Precise motion control for machine tools, injection molding machines, and hydraulic workbenches.
• Specialized Scenarios: Emergency operations for fire trucks and marine hydraulic systems.
5. Advantages
• Cost-Effectiveness
• Monoblock design reduces piping and installation costs, simplifies maintenance, and lowers lifecycle costs.
• Flexibility and Expandability
• Supports parallel or stacked connections of multiple valves to accommodate complex hydraulic circuits.
• Safety
• Built-in overload protection and pressure compensation functions prevent system overpressure or overheating.
6. Selection and Installation Recommendations
• Selection Criteria
• Load type (inertial/static): Choose O-type or P-type spools.
• Control precision requirements: Proportional valves for precise control; on/off valves for simple actions.
• Environmental conditions: Select special sealing materials for high-temperature/high-humidity applications.
• Installation Notes
• Ensure horizontal installation of the valve body to avoid internal leakage due to tilting.
• Maintain hydraulic oil cleanliness at NAS 7 or higher to prevent spool sticking.
• Regularly check solenoid coil temperatures (≤80°C) to avoid overheating damage.
7. Maintenance and Troubleshooting
• Routine Maintenance
• Inspect seals quarterly for wear and replace aging components.
• Clean filters regularly to prevent oil contamination.
• Common Faults and Solutions【表格】
Fault Symptom Possible Cause Solution
Spool sticking Oil contamination, seal aging Clean valve body, replace seals
Slow response Insufficient solenoid voltage, spool wear Check power supply, replace spool
Severe leakage Valve body cracks, seal surface damage Repair valve body, replace seal rings
8. Conclusion
The SD5 Series Monoblock Direction Control Valve is an ideal choice for small- to medium-sized hydraulic systems due to its integrated design, high reliability, and flexible expandability. By selecting the appropriate model and installing it correctly, system efficiency can be significantly improved while reducing maintenance costs. For applications requiring high-precision control or complex circuits, it is recommended to combine the valve with proportional valves or stackable valve modules for functional upgrades.
