DL Series Multiple Directional Valve | DL40-E20L-T DL-F20L-T | Sectional Control Valve

The DL Series sectional multiple directional control valves from Chengyuan Hydraulic are high-pressure multifunctional components fully compatible with industrial standards. Featuring a modular Sectional Design, the series allows for flexible configurations from 1 to 10 sections to meet specific hydraulic circuit requirements. For core models like DL40-E20L-T and DL-F20L-T, we have optimized the spool functions and internal flow galleries. The DL series integrates a main relief valve in the inlet section and load check valves in each work section to prevent backflow and protect the system. Every valve assembly undergoes 100% simulated full-load condition testing to ensure stability and zero leakage under extreme environments, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: DL Series (Sectional Directional Control Valve)

• Nominal Flow Rate: 40 L/min (DL40) / 80-100 L/min (DL-F20)

• Nominal Pressure: 16 MPa (E-Class) / 20 MPa (F-Class) / Up to 31.5 MPa Peak

• Number of Sections: 1 to 10 Work Sections

• Spool Functions: O, M, Y, A, Q, P (e.g., OO(AB) code definitions)

• Actuation Methods: Manual, Pneumatic, Electro-hydraulic, Solenoid

• Port Threads: G1/2, G3/4, or M22×1.5 (customizable)

• Integrated Auxiliary Valves: Main relief valve and individual check valves per section

Key Technical Advantages:

• Modular Sectional Structure: The DL series connects sections via tie-bolts, allowing users to quickly add or remove work sections based on the number of actuators (cylinders/motors). This design simplifies maintenance, as a single damaged section can be replaced without scrapping the entire valve block.

• Precision Spool Fitting: We utilize high-strength ductile iron bodies and CNC-ground spools. The clearance between the spool and the bore is maintained at 0.008-0.012mm, ensuring smooth operation while minimizing pressure drops and neutral-position internal leakage.

• Superior Metering Characteristics: Precision-machined throttling notches (V-slots) on the spool allow the operator to control the actuator speed with extreme accuracy. This is critical for applications like crane lifting where smooth, incremental movement is essential.

• Integrated Safety Reliability: The inlet section features a direct-acting relief valve for rapid response against system overloads. Furthermore, each work section is equipped with an independent load check valve, preventing backflow and “load dropping” during directional shifts.

Application Areas:

• Special Purpose Vehicles: Wreckers, sanitation trucks, and aerial work platforms.

• Construction Machinery: Truck-mounted cranes, log loaders, and drilling rigs.

• Agricultural Equipment: Tractor hitch controls and harvester distribution systems.

Expert Maintenance Tips:

• Tie-Bolt Torque Regulation: When adding or replacing sections, use a torque wrench to tighten tie-bolts evenly. Uneven tightening can warp the valve body, leading to spool binding.

• O-Ring Inspection: Sectional valves rely on O-rings between each block. If leakage occurs between sections, check the oil temperature to ensure seals haven’t failed due to overheating.

• Handle Lubrication: Regularly apply grease to the handle pivot points and ball joints. This ensures consistent feedback for the operator and prevents corrosion in humid or outdoor working environments.