Product Overview
The 24EI1-H6B-T is a wet-type solenoid directional control valve designed to YUKEN mounting standards, belonging to the 24EI1/24BI1 series product line. The valve features subplate mounting, NG6 size, rated pressure of 31.5 MPa (315 bar), and nominal flow of 40 L/min. Solenoid directional valves are control valves in which the solenoid directly actuates the spool to switch direction, primarily used for start, stop, and directional control of hydraulic actuators, and can also serve as pilot valves for high-power hydraulic valves.
The series is manufactured by multiple domestic hydraulic component manufacturers, with mounting dimensions conforming to YUKEN standards for direct interchangeability without requiring modification to the manifold block. In the 24EI1 designation, “E” indicates a wet-type DC solenoid (DC), and “I1” is the spool function code corresponding to a three-position, four-way, spring-centered standard spool configuration.
The wet-type solenoid integrates the armature and push rod into a single unit, with pressure oil introduced between the yoke and armature. This eliminates the intermediate dynamic seal, solving oil leakage issues while avoiding coil overheating, shock, vibration, and noise caused by seal damage or excessive oil temperature rise, significantly improving switching reliability and service life.
The 24BI1-H10B-T is the NG10 size variant within the same series, with nominal flow of 40 L/min, also featuring subplate mounting and wet-type solenoid construction for hydraulic systems requiring larger port sizes.
Every valve undergoes 100% simulation-based testing prior to shipment, covering switching reliability, internal leakage, pressure holding, and solenoid holding force. As a drop-in replacement, the valve is fully compatible with the OEM YUKEN specification in mounting dimensions, port locations, and performance characteristics.
Technical Specifications
All parameters below are based on verified supplier technical pages and industry-standard specifications:
24EI1-H6B-T Technical Specifications:
Complete Model: 24EI1-H6B-T
Product Series: 24EI1 / 24BI1 series solenoid directional valve
Brand Compatibility: YUKEN DSG series interchangeable
Spool Function: Three-position, four-way solenoid directional valve
Spool Function Code: I1 (spring-centered, standard spool)
Nominal Size: NG6 (6 mm)
Mounting: Subplate mounting (B = subplate connection)
Rated Pressure: 31.5 MPa (315 bar)
Nominal Flow: 40 L/min (H6 specification)
Permissible Back Pressure: < 6.3 MPa
Solenoid Type: Wet-type solenoid (E = wet-type DC)
Supply Voltage: AC 220V / DC 24V
Permissible Voltage Variation: ±10%
Solenoid Power Consumption (Holding): AC: 26W; DC: 40W
Permissible Energization Duration: Continuous duty
Switching Frequency: Wet-type solenoid 60 cycles/min
Maximum Switching Frequency: Wet-type solenoid 120 cycles/min
Media Temperature Range: Mineral oil -20°C to +70°C; water-containing fluid +10°C to +54°C
Viscosity Range: 10 – 350 mm²/s
Oil Filtration Precision: ≤ 30 μm
Operating Temperature Range: -20°C to +80°C
Hydraulic Fluid: Mineral oil, water-containing fluid
24BI1-H10B-T Technical Specifications:
Complete Model: 24BI1-H10B-T
Nominal Size: NG10 (10 mm)
Nominal Flow: 40 L/min
Solenoid Type: Wet-type AC (B = wet-type AC)
Supply Voltage: AC 220V
Remaining parameters (rated pressure, back pressure, temperature range, etc.) consistent with 24EI1-H6B-T general specifications
Note: Specifications are based on verified supplier technical pages (Wuxi Fulide, Wuxi Xinli, Made-in-China, etc.) and industry-standard specifications. Model code breakdown: 24 = two-position, four-way; E = wet-type DC solenoid (DC) / B = wet-type AC solenoid (AC); I1 = spool function code; H = nominal pressure 31.5 MPa; 6 / 10 = nominal size NG6 / NG10; B = subplate connection; T = spring return and centering. This series is manufactured by multiple domestic manufacturers; specific parameters may vary slightly between suppliers. Always verify against the actual supplier’s technical documentation during selection.
Key Technical Advantages
1. Wet-Type Solenoid Construction for Significantly Extended Service Life
The 24EI1-H6B-T employs a wet-type solenoid design that integrates the armature and push rod into a single unit, with pressure oil introduced between the yoke and armature, eliminating the intermediate dynamic seal of conventional dry-type valves. This design fundamentally solves oil leakage issues while avoiding coil overheating, shock, vibration, and noise caused by seal damage or excessive oil temperature rise. Because solenoid holding force is increased, matched return spring stiffness is greater, enabling more reliable switching and extended service life. Compared with dry-type valves, service life is approximately 20 times longer.
2. YUKEN Standard Mounting Dimensions for Drop-In Interchangeability
The mounting dimensions of this solenoid directional valve series fully conform to YUKEN standards. Port locations, mounting bolt hole spacing, and mounting surface dimensions are identical to the YUKEN DSG series. No manifold modification or remachining of the mounting surface is required for replacement — direct drop-in interchangeability is achieved. For equipment maintenance and spare parts replacement scenarios, this compatibility significantly reduces downtime and retrofit costs.
3. High Pressure Rating with Compact Subplate Design
The rated pressure reaches 31.5 MPa (315 bar), satisfying medium-to-high pressure hydraulic system control requirements. The subplate mounting design enables direct installation of the valve body onto integrated manifolds, eliminating additional piping connections, reducing leakage points and installation space requirements, and facilitating system integration and maintenance.
4. Precision-Lapped Spool with Low Internal Leakage
The spool is manufactured through precision lapping processes, with clearance tolerances held to strict specifications, achieving low internal leakage and quiet operation. The precision fit between spool and sleeve ensures accuracy and repeatability of switching action, suitable for industrial hydraulic applications requiring control precision. Permissible back pressure reaches 6.3 MPa, enabling reliable operation in systems with return line back pressure.
5. 100% Simulation-Based Testing and Drop-In Interchangeability
Every valve undergoes 100% simulation-based testing prior to shipment. Test protocols cover switching reliability, internal leakage measurement, pressure holding performance, and solenoid holding force verification. The valve is fully compatible with the OEM YUKEN specification in mounting dimensions, port locations, and performance characteristics, enabling direct replacement without hydraulic circuit modification.
Application Areas
Injection Molding Machines: Directional control of mold clamping, injection, holding, and mold opening actions
Hydraulic Balers: Directional control of press head lifting and baling actions
Machine Tool Hydraulic Systems: Worktable feed, fixture clamping, and tool changer action control
Construction Machinery: Hydraulic pilot control circuits for excavators and loaders
Mining Equipment: Hydraulic directional control for supports, drilling rigs, and related equipment
Hydraulic Pump Stations: Sequential action and direction switching control for multiple actuators
Woodworking Machinery: Directional control of hydraulic pressing and feeding mechanisms
Expert Maintenance Tips
Pre-Installation Checks:
Verify manifold mounting surface is clean and free of burrs; inspect O-ring seals for damage
Flush all piping with clean hydraulic fluid prior to installation; ensure system cleanliness reaches ISO 4406 18/15 or better
Confirm solenoid voltage specification (AC 220V or DC 24V) matches the control system
Tighten mounting bolts in diagonal sequence to specified torque to prevent valve body distortion and spool binding
Operational Maintenance:
Use a 10 μm or finer pressure filter, specified without bypass and equipped with a contamination indicator
Recommended fluid: mineral oil-based anti-wear hydraulic oil; maintain operating viscosity within 10 – 350 mm²/s
Maintain media temperature within -20°C to +70°C (water-containing fluid +10°C to +54°C); avoid overheating
Periodically verify solenoid coil resistance is within rated range; check terminals for oxidation or looseness
System return back pressure must not exceed 6.3 MPa to avoid spool switching difficulty
Wet-type solenoids are rated for continuous duty; no intermittent cooling required, but ensure ambient temperature does not exceed +80°C
Troubleshooting Guide:
Spool fails to actuate or switches abnormally: Check solenoid supply voltage (AC 220V / DC 24V, ±10% permissible variation), measure coil resistance, verify control signal reaches the valve correctly
Increased internal leakage: Check system cleanliness level; inspect spool/sleeve for wear; replace seals if necessary
Excessive switching noise: Verify solenoid holding force is normal; check return spring for fatigue; confirm oil viscosity is within specified range
Coil overheating: Check supply voltage is not excessive; verify solenoid power consumption is within rated range (AC: 26W; DC: 40W)
Spool sticking: Check oil cleanliness; verify filtration precision meets ≤ 30 μm requirement
