construction is an independently develaped contral valves by our company.
inner check valve: The check valve inside the valve body is to insure the hydraulic oil not to be returned.
Inner relief valve: The relief valve inside the valve body is able to adjust the hydraulic system working pressure
ZD-L102 Series Monoblock Directional Control Valves
1. Product Overview
TheZD-L102 Seriesis amonoblock (single-piece cast)directional control valve designed for hydraulic systems, offering compactness, reliability, and versatility in fluid power applications. Unlike multi-piece valve banks, monoblock valves integrate multiple functions (directional control, pressure relief, flow regulation) into a single body, reducing leakage points and simplifying installation.
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2. Key Features and Technical Advantages
2.1. Monoblock Design Benefits
• Compact & Lightweight: Single-piece casting minimizes space requirements and weight.
• Reduced Leakage: Fewer joints compared to sectional valves, improving system efficiency.
• Easy Installation: Pre-drilled mounting holes and standardized ports for quick integration.
2.2. Functional Versatility
• Directional Control: Up to4 spools(e.g., 2P, 3P, 4P configurations) for multi-actuator operation.
• Pressure Relief: Integrated relief valve protects the system from overpressure.
• Flow Regulation: Optional check valves, throttle valves, or load-holding valves for precise control.
2.3. Robust Construction
• Materials:
• Body: High-strength cast iron (GG25/GG30) for durability.
• Spools: Hardened and ground steel for low friction and long life.
• Sealing Technology:
• Hydraulic: High-pressure O-rings, PTFE seals, and anti-extrusion back-ups.
• Operating Pressure: Up to315 bar(4,568 psi) for heavy-duty applications.
2.4. Safety and Compliance
• CE Certified: Meets EU safety and environmental standards.
• Optional Features:
• Anti-cavitation valvesfor high-pressure drop protection.
• Manual overridefor emergency operation.
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3. Technical Specifications
【表格】
Parameter Specification
Spool Options 2P, 3P, 4P (parallel, series, tandem circuits)
Max. Operating Pressure 315 bar (4,568 psi)
Flow Rate 40–120 L/min (10.6–31.7 GPM)
Port Sizes SAE, DIN, or BSPP (G1/2, G3/4, etc.)
Actuation Type Manual lever, hydraulic pilot, or electric solenoid
Temperature Range -20°C to +80°C (-4°F to +176°F)
Protection Class IP65 (dustproof, water-resistant)
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4. Applications
4.1. Industrial Machinery
• Mobile Hydraulics:
• Excavators, loaders, and agricultural tractors.
• Stationary Systems:
• Plastic injection molding machines, presses, and testing rigs.
4.2. Construction & Mining
• Drilling Rigs: For hydraulic cylinder control in drill head positioning.
• Material Handling: Forklifts, cranes, and conveyor systems.
4.3. Specialized Applications
• Marine Hydraulics: Winches, steering systems, and deck machinery.
• Aerospace Ground Support: Aircraft loading platforms and hydraulic test stands.
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5. Advantages Over Traditional Systems
1. Cost-Effective:
• Monoblock designreduces manufacturing and assembly costs compared to sectional valves.
• Fewer leakage pointslower maintenance expenses.
2. Flexibility:
• Modular spool optionsallow customization for specific applications (e.g., tandem circuits for synchronized motion).
• Electric/hydraulic pilot optionsenable remote or automated control.
3. Reliability:
• Hardened spoolsresist wear in high-cycle applications.
• Built-in relief valvesprevent system damage from pressure spikes.
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6. Selection and Installation Guide
6.1. Selection Criteria
• Load Requirements:
• Forhigh-force applications(e.g., excavator arms), choose a valve with a higher flow rate and pressure rating.
• Forprecise motion control(e.g., robotic arms), opt for proportional or servo-controlled variants.
• Actuation Type:
• Manual lever: For simple, low-cost applications.
• Hydraulic pilot/electric solenoid: For remote or automated systems.
• Environmental Conditions:
• Formarine/corrosive environments, select stainless steel or nickel-plated spools.
6.2. Installation Tips
• Mounting: Secure the valve to a rigid surface using pre-drilled holes to avoid vibration.
• Porting: Ensure proper alignment of hydraulic lines to prevent pressure drops.
• Testing: Cycle the valve under no-load conditions before full operation to check for leaks.
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7. Maintenance and Troubleshooting
7.1. Routine Maintenance
• Cleaning: Periodically flush the system to remove contaminants.
• Inspection: Check for leaks around spools and seals.
• Lubrication: Apply hydraulic oil to spool shafts if manual operation is stiff.
7.2. Common Faults and Solutions
【表格】
Fault Symptom Possible Cause Solution
Valve Stuck/Sluggish Contaminated oil, worn spool Clean system, replace spool
Leakage at Ports Damaged O-rings, loose fittings Replace seals, tighten fittings
Overheating Excessive pressure drop, high flow Adjust system pressure, reduce flow
Noisy Operation Air in hydraulic lines, cavitation Bleed air, install anti-cavitation valve
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8. Conclusion
TheZD-L102 Series Monoblock Directional Control Valveoffers a cost-effective, reliable, and versatile solution for hydraulic systems requiring compact design and multi-function control. Its modular spool options, high-pressure rating, and robust construction make it suitable for industrial, mobile, and marine applications.
For optimal performance, ensure proper selection based on load requirements and environmental conditions. Regular maintenance and adherence to installation guidelines will extend the valve’s lifespan.
