Simple, compact and heavy duty designed sectional valve from 1-14 sections for open and closed centre hydraulic systems.
Spool function options: O.P.Y. A and etc.
Nominal diameter: G1/2; G3/4,7/8-14UNF ,SAE10,3/4-16UNF, SAE8,M18X1.5Spring side contral options: spring control and detent control
Lever side control options: manual, pneumatic control, electric and pneumatic control, hydraulic and electric contral, hydraulic contral and remote control.
SD8 Series Sectional Directional Control Valves
——Professional Overview & Application Guide
1. Product Overview
TheSD8 Series Sectional Directional Control Valvesare modular hydraulic valves designed for precise flow and directional control in hydraulic systems. They are widely used in industrial machinery, construction equipment, agricultural machinery, and mobile hydraulic systems due to their flexibility, reliability, and high performance.
2. Key Features & Advantages
• Modular Design:
• Customizable Configuration: Valves can be combined in series to form multi-function hydraulic control units (e.g., directional control, pressure relief, flow regulation).
• Easy Maintenance: Individual sections can be replaced without disassembling the entire valve block, reducing downtime.
• High Flow Capacity:
• Nominal flow rates up to120 L/min(adjustable based on valve size and configuration).
• Suitable for high-power hydraulic systems (e.g., excavators, loaders, press machines).
• Compact & Lightweight:
• Aluminum alloy valve body reduces weight while maintaining durability.
• Space-saving design for installation in tight machinery compartments.
• High Pressure Rating:
• Maximum operating pressure:35 MPa (350 bar)(standard), with high-pressure variants available up to40 MPa.
• Reliable Sealing:
• High-quality O-rings and metal seals prevent leakage under high pressure and temperature.
• Multiple Actuation Options:
• Manual (lever/pushbutton), solenoid, hydraulic pilot, or pneumatic control.
• Optional explosion-proof and remote control capabilities for hazardous environments.
3. Technical Specifications (Example, Subject to Manufacturer's Data)
【表格】
Parameter Specification
Model Series SD8-10, SD8-16, SD8-22 (based on port size)
Nominal Flow (Qn) 10~120 L/min (adjustable)
Max Operating Pressure 35 MPa (Standard), 40 MPa (High-Pressure)
Connection Method Flange (DIN/ISO), Thread (G/BSPT), or SAE
Number of Sections 1~12 (customizable)
Actuation Method Manual, Solenoid, Hydraulic Pilot, Pneumatic
Medium Temperature Range -20°C~+80°C (Standard), -40°C~+120°C (High-Temperature)
Valve Body Material Aluminum Alloy (Standard), Cast Iron (Optional)
Sealing Material NBR, FKM, or PTFE (based on medium compatibility)
Protection Grade IP65 (Standard), IP67 (Optional)
4. Working Principle
• Directional Control:
• The valve core (spool) shifts to direct hydraulic oil flow to different ports, controlling actuator movement (e.g., cylinder extension/retraction).
• Modular Assembly:
• Each section (e.g., directional control, pressure relief, check valve) is bolted together to form a custom valve block.
• Actuation Logic:
• Manual: Lever or pushbutton operation.
• Solenoid: Electromagnetic coil shifts the spool via a pilot valve.
• Hydraulic Pilot: Pressurized oil from another source controls the spool.
• Pneumatic: Compressed air drives the spool via a diaphragm or piston.
5. Application Scenarios
【表格】
Industry Typical Applications
Construction Machinery Excavators, Loaders, Backhoes (directional control of hydraulic cylinders/motors)
Agricultural Machinery Tractors, Harvesters, Sprayers (flow regulation and actuator control)
Material Handling Forklifts, Cranes, Conveyors (hydraulic system control)
Mining Equipment Drilling Rigs, Bulldozers (high-pressure hydraulic systems)
Marine Engineering Ship Winches, Anchors, Steering Systems (corrosion-resistant variants)
6. Selection Guide
• Port Size Selection:
• SD8-10: Low-flow applications (e.g., small cylinders).
• SD8-16/22: High-flow applications (e.g., heavy machinery).
• Actuation Method Selection:
• Manual: Simple, cost-effective for low-frequency operations.
• Solenoid: Remote automation (e.g., PLC control).
• Hydraulic Pilot: High-pressure, high-flow systems where electric control is impractical.
• Material & Sealing:
• Aluminum Body: Lightweight, suitable for mobile machinery.
• Cast Iron Body: Higher durability for heavy-duty industrial use.
• Seal Compatibility: Choose NBR (general oils), FKM (high-temperature), or PTFE (corrosive media).
7. Installation & Maintenance Tips
• Installation Notes:
• Ensure proper alignment of valve sections to prevent leakage.
• Use clean hydraulic oil and install filters to prevent contamination.
• Maintenance Recommendations:
• Regularly inspect seals and O-rings for wear (replace every 2~3 years).
• Flush the hydraulic system annually to remove debris.
• Troubleshooting:
• Leakage: Check seal integrity, valve body alignment, and hydraulic pressure.
• Spool Sticking: Clean or replace contaminated hydraulic oil; check for mechanical obstructions.
• Slow Response: Verify solenoid coil function (for electric valves) or hydraulic pilot pressure.
8. Comparison with Similar Products
【表格】
Comparison Item SD8 Series Sectional Valves Monoblock Directional Control Valves Cartridge Valves
Flexibility High (modular) Low (fixed functions) Medium (stackable)
Flow Capacity Medium-High (up to 120 L/min) Low-Medium (up to 80 L/min) High (up to 300 L/min)
Installation Space Moderate (modular design) Small (compact) Very Small (cartridge)
Cost Medium (modular system) Low (single valve) High (precision)
Repair Complexity Low (replace individual sections) High (replace entire valve) Medium (replace cartridge)
9. Summary & Recommendations
• Recommended Scenarios:
• Applications requiringcustomizable hydraulic control(e.g., multi-actuator machinery).
• High-pressure, high-flow systems(e.g., excavators, loaders).
• Non-Recommended Scenarios:
• Simple, low-cost hydraulic systems where a monoblock valve suffices.
• Recommended Configuration:
• SD8-16/22 with solenoid or hydraulic pilot actuation for industrial automation.
• Corrosion-resistant aluminum body + FKM seals for marine or chemical applications.
