24EI1-H6B-T Yuken Solenoid Directional Valve 31.5 MPa NG6

Product Overview

The 24EI1-H6B-T series solenoid directional control valve (including 24BI1-H10B-T, 24EI1, 24EI2, 24EI3, and 24BI3 variants) is a subplate-mounted solenoid directional control valve manufactured to international hydraulic standards, covering both size 6 (NG6 / CETOP 3) and size 10 (NG10 / CETOP 5) configurations. The mounting surface conforms to ISO 4401, used for directing and stopping flow at any point in a hydraulic system, providing precise directional control of hydraulic actuators.

This product belongs to the joint design series solenoid directional valve. Mounting dimensions follow the Yuken DSG series standard, allowing direct interchangeability with Yuken valves without manifold modification. The 24EI1-H6B-T is a size 6 wet armature DC solenoid directional valve, while the 24BI1-H10B-T is a size 10 wet armature AC solenoid directional valve. Multiple spool functions are available including I1, I2, I3, O, H, P, and Y types, meeting diverse hydraulic circuit design requirements. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, and internal leakage measurement.

Technical Specifications 

General Specifications

• Model: 24EI1-H6B-T / 24BI1-H10B-T

• Related Models: 24EI1 / 24EI2 / 24EI3 / 24BI1 / 24BI3

• Product Series: Joint Design Series (Size 6 / Size 10)

• Size: 6 mm (NG6 / CETOP 3); 10 mm (NG10 / CETOP 5)

• Design: Subplate mounting solenoid directional valve with wet armature solenoids

• Ways/Positions: 2-way 4-port / 3-way 4-port

• Mounting Pattern: ISO 4401 / CETOP RP121H

• Mounting: Subplate mounting, any position

Hydraulic Parameters

• Nominal Pressure: 31.5 MPa (315 bar / 4570 psi)

• Nominal Flow Rate: Size 6: 10 L/min; Size 10: 40 L/min

• Permissible Back Pressure: < 6.3 MPa (63 bar)

• Hydraulic Fluid: Mineral-based hydraulic oil, water-containing fluids

• Fluid Temperature Range: Mineral oil -20°C to +70°C; water-containing fluids +10°C to +54°C

• Viscosity Range: 10 – 350 mm²/s

• Filtration: ≤ 30 μm

Electrical Parameters

• Solenoid Type: E-type wet armature DC; B-type wet armature AC

• Supply Voltage: AC 220V 50Hz / DC 12V / DC 24V

• Voltage Tolerance: ± 10%

• Solenoid Power Consumption (holding): Size 6 AC: 26W / DC: 40W; Size 10 AC: 40W / DC: 42W

• Duty Cycle: Continuous

• Switching Frequency: Wet armature 60 cycles/min; Maximum 120 cycles/min

Spool Function Codes

• I1 Function: All ports (P/A/B/T) interconnected in neutral (suitable for unloading circuits)

• I2 Function: Ports A/B connected to tank in neutral (suitable for differential circuits)

• I3 Function: Ports A/B closed, P to tank in neutral (suitable for locking circuits)

• O Function: All ports closed in neutral (suitable for holding circuits)

• H Function: All ports interconnected in neutral

• Y Function: Ports A/B connected to tank in neutral

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Size 10: approx. 3.0 kg

• Size 6: approx. 2.0 kg

Key Technical Advantages

1. Wet Armature Solenoid Design for High Switching Reliability
The 24EI/24BI series employs a wet armature solenoid design where the armature and push rod are integrated as a single unit, with pressure oil introduced between the yoke and armature, eliminating the intermediate dynamic seal. This design effectively resolves oil leakage issues associated with conventional dry solenoid valves, while avoiding coil overheating, impact vibration, and noise caused by seal damage or excessive oil temperature rise. Compared to dry-type valves, the service life of wet-type valves is increased approximately 20 times, significantly improving switching reliability and service life.

2. Precision Spool Grinding with Low Internal Leakage Design
The control spool is precision-ground from carburized steel with micron-level clearance control, maintaining low internal leakage at the rated pressure of 31.5 MPa, reducing system energy loss and fluid temperature rise. The precision spool grinding process ensures low operating noise and smooth shifting.

3. Multiple Spool Functions for Flexible Circuit Design
The series offers I1, I2, I3, O, H, P, and Y spool functions to meet diverse hydraulic circuit requirements. I1 is suitable for unloading circuits, I2 for differential fast-approach circuits, and I3 for locking circuits. Size 10 valves have three T ports; either one may be used, and the T port must be connected to the return line.

4. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every valve undergoes 100% bench testing prior to shipment, covering 31.5 MPa rated pressure holding, directional response time measurement, internal leakage verification, and solenoid force characterization. Mounting dimensions follow the Yuken DSG series standard, enabling direct drop-in replacement without modifying piping systems or control programs, significantly reducing Total Cost of Ownership (TCO).

Application Areas

• Injection Molding Machines: Mold opening/closing direction control, ejector system control

• Hydraulic Balers: Main cylinder directional control, compression circuit direction control

• Machine Tools: CNC hydraulic clamping systems, tool changer control

• Woodworking Machinery: Press plate and feed mechanism direction control

• Construction Machinery: Auxiliary hydraulic circuit direction control

• Mining Equipment: Hydraulic support direction control, drilling rig feed circuits

• Hydraulic Power Units: Small-to-medium hydraulic power pack directional control

Expert Maintenance Tips

Installation Guidelines

1. The 24EI1-H6B-T series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the recommended torque value.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes. Fluid filtration requirement is ≤ 30 μm.

3. The tank port (T) must be connected to the return line. Permissible back pressure must not exceed 6.3 MPa. Size 10 valves have three T ports; either one may be used.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at NAS 1638 Class 10 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. Solenoid Electrical Inspection: Periodically inspect electrical connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Solenoid power consumption reference: Size 6 DC 40W, Size 10 DC 42W.

3. Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels.

4. Seal Replacement: Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours. For water-containing fluid applications, reduce the replacement interval.

5. Back Pressure Management: Tank port back pressure must not exceed 6.3 MPa. If system return back pressure is high, inspect the return line for blockage or undersized piping.