HAWE DLEH Series Solenoid Valve | DLEH-3A DLEH-2A/R Seated Valve

The DLEH Series pilot-operated directional seated solenoid valves manufactured by Chengyuan Hydraulic are high-pressure fluid control components fully engineered to match global HAWE industrial benchmarks. Distinct from conventional spool-type solenoid valves that rely on sliding clearances, the DLEH series incorporates a micro-lapped ball-on-seat or cone poppet architecture. This design delivers a defining engineering advantage: absolute bi-directional zero leakage (leak-free seating), which eliminates position drift in hydraulic holding loops. The comprehensive portfolio precisely matches target user catalog configurations: including the 3-way arrays DLEH-3A and DLEH-3A-X 24DC (equipped with a heavy-duty 24V DC wet solenoid armature and standard wiring connection), alongside the 2-way configurations DLEH-2A-U and the shock-dampening soft-shifting variant DLEH-2A/R X-24DC. Operating reliably up to a maximum continuous rating of 400 bar, every singular DLEH valve undergoes 100% test-bench verification for drop-tight static pressure holding at 400 bar, solenoid armature drop-out/pick-up transition dead-band calibration, and continuous high-cycle shifting fatigue tests prior to shipment to ensure matching original parameters, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: HAWE DLEH Series Template Pilot-Operated Directional Seated Leak-Free Solenoid Valves

• Model Configurations Supported: DLEH-3A-X 24DC / DLEH-2A-U / DLEH-3A / DLEH-2A/R X-24DC

• Circuit Function Flow Channels (2A / 3A):

  • Configuration Code DLEH-2A: 2/2-way directional seated valve, providing absolute open/closed flow path isolation.

  • Configuration Code DLEH-3A: 3/2-way directional seated valve, engineered for shifting and routing fluid supply and tank pathways.

• Maximum System Operating Pressure MAWP: Rated strictly up to 400 bar (40 MPa / 5800 psi) continuous.

• Maximum Allowable Flow Capacity: Rated volumetric delivery up to 12 L/min (3.1 gpm).

• Standard Electrical Actuation Specs (Code X 24DC):

  • Voltage Metric 24DC: Heavy-duty 24V Direct Current wet pin-type shift-induction electromagnet.

  • Suffix Code X: Standard integrated electrical connection housing layout without manual override controls (DIN type compatible).

• Specialized Control Suffixes (/R and -U):

  • Suffix /R: Integrated sub-miniature fluid damping orifice within the primary flow gallery for smooth, soft-shifting performance.

  • Suffix -U: Subplate-mounting design optimized with high-compression O-ring seating seals at the base interface.

• Seating Mechanical Grade: Precision-hardened bearing steel ball-on-cone interface, securing zero fluid drops under 400 bar load.

Key Technical Advantages:

• Micro-Lapped Metal-to-Metal Poppet Seating for Absolute Zero Leakage: The DLEH series features a micro-lapped ball or cone poppet seating layout that forms a precise metal-to-metal contact seal line. This configuration prevents the microscopic fluid weeping typical of sliding-spool clearances, even under a sustained 400 bar differential pressure. This design ensures stable, drift-free position holding for outrigger locking grids and pilot safety blocks.

• All-Steel Monoblock Housing Castings for Extreme Pressure Handling: The valve frame is machined from high-tensile premium alloy steel and through-hardened. This structure offers superior fatigue resistance and tensile capacity compared to generic cast iron bodies, absorbing high-frequency pressure spikes and providing a low flow resistance profile under full 12 L/min conditions.

• Oil-Immersed Wet-Armature Solenoid Core for High Cycle Life: The shifting armature assembly operates fully immersed in the system fluid, providing continuous lubrication and effective cooling for the coil winding. The oil film dampens mechanical impacts during high-frequency switching, enabling millions of reliable cycles with consistent response times.

• Integrated Flow Damping Orifices (/R Configurations) for Soft Shifting: Models like the DLEH-2A/R embed a flow-calibrated damping plug within the core gallery. This orifice limits fluid velocity transients during armature actuation or return, smoothing out sudden pressure spikes. This design buffers hydraulic water hammer shocks, protecting downstream sensors, fittings, and lines.

Application Areas:

• Heavy Industrial Plant CNC Machining & Clamping Loops: Dedicated pilot-operated zero-leakage check block handling multi-axis CNC hydraulic chuck blocks to prevent clamping force degradation.

• Mobile Construction Machinery & Pilot Controls: Main master isolation safety valves for excavator joystick pilot blocks and outrigger lock manifold arrays on heavy truck cranes.

• Wind Turbine Pitch & Braking Infrastructure Control: Leak-free lock-holding valve groups for active wind turbine rotor braking grids and multi-stage emergency pitch positioning units.

Expert Maintenance Tips:

• Secure the Electrical DIN Terminal Connection to Prevent Water and Fluid Ingress: For the electrified DLEH-3A-X 24DC block, ensure the square rubber packing ring sets flat inside the connector housing and tighten the central DIN plug screw completely during installation. Because the solenoid generates heat during operation, any moisture, cutting fluid, or fine airborne dust drawn into the terminal housing can cause internal pin short-circuiting or localized coil burnout.

• Enforce Strict 10-Micron Filtration Targets to Protect the Seated Poppet: Because directional seated valves rely on rigid metal surfaces to lock high pressures, any hard micro-particulates like weld slag or tape shreds trapped between the seating interfaces will scratch the seal line and trigger severe internal leakage. Maintain system fluid cleanliness to match or exceed ISO 4406 18/15/12 (NAS Class 6), and install a 10-micron high-pressure inline pressure filter equipped with a clogging indicator upstream.

• Clean Mounting Interfaces and Apply Diagonal Torque Balancing for Subplate Subplate Formats: When mounting or replacing a subplate-configured base module like the DLEH-2A-U array, thoroughly check the subplate interface for surface burrs or legacy adhesive residues, and do not pack the O-ring tracks with heavy industrial grease (which can harden over time and compromise the seal). Tighten the three mounting bolts in a diagonal sequence across 2 to 3 progressive stages using a calibrated manual torque wrench. This uniform tension prevents micro-distortion of the valve sleeve, which could otherwise bind the lightweight internal pilot pistons.