24EI1-H10B-T Yuken Solenoid Directional Valve 315 Bar NG10

Product Overview

The 24EI1-H10B-T series solenoid directional control valve (including 24EI1, 24EI2, 24EI3, 24BI1, and 24BI3 variants) is an NG10 (CETOP 5) solenoid-operated directional valve manufactured to international hydraulic standards, with a mounting surface conforming to ISO 4401. Featuring wet armature solenoid actuation, the valve directly shifts the spool to control hydraulic circuit direction and flow, widely used in industrial hydraulic systems for directional control of actuators.

This product utilizes the YUKEN DSG-02 series mounting dimensions, offering true drop-in interchangeability for direct replacement of same-specification Yuken and domestic standard NG10 solenoid valves without modifying manifolds or piping systems. Multiple spool functions are available including I1 (all ports interconnected in neutral), I2 (A/B to tank in neutral), and I3 (A/B closed in neutral), 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, ensuring performance consistency with the original equipment.

Technical Specifications 

General Specifications

• Model: 24EI1-H10B-T (also available: 24EI2-H10B-T / 24EI3-H10B-T / 24BI1-H10B-T / 24BI3-H10B-T)

• Product Series: 24E/24B Series (NG10 / CETOP 5)

• Size: 10 mm (NG10 / CETOP 5)

• Design: Direct-acting, subplate mounting solenoid directional valve

• Ways/Positions: 4-way, 3-position (spring centered) / 4-way, 2-position (spring return)

• Mounting Pattern: ISO 4401-05 / CETOP RP121H

• Mounting: Subplate mounting, any position

Hydraulic Parameters

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

• Rated Flow: 40 L/min

• Maximum Pressure: 31.5 MPa (315 bar)

• Hydraulic Fluid: Mineral-based hydraulic oil

• Fluid Temperature Range: -20°C to +80°C

• Filtration: Recommended ISO 4406 20/18/15 (NAS 1638 Class 10)

• Permissible Back Pressure: Port T max. 6.3 MPa (63 bar)

Electrical Parameters

• Solenoid Type: Wet armature solenoid (E-type for DC, B-type for AC)

• Supply Voltage: DC24V / AC220V (standard)

• Electrical Connector: DIN standard connector

• Protection Class: IP65 (with standard connector)

• Switching Response Time: < 50 ms

Spool Function Codes

• I1 Function: All ports (P/A/B/T) interconnected in neutral (open center, 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)

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Weight: approx. 3.0 – 5.0 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. The increased solenoid holding force and matching stiffer return springs significantly improve switching reliability and service life.

2. High-Pressure Cast Iron Body with Optimized Flow Passages
The valve body is cast from high-strength iron with a nominal pressure rating of 31.5 MPa (315 bar). Internal flow passages are optimized to minimize pressure drop. The control spool is precision-ground with micron-level clearance control, maintaining low internal leakage at the rated flow of 40 L/min, reducing system energy loss and fluid temperature rise.

3. Multiple Spool Functions for Flexible Circuit Design
The series offers I1, I2, and I3 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. The mounting dimensions follow the YUKEN DSG series standard, allowing direct interchangeability with Yuken valves without manifold modification.

4. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 24EI1-H10B-T 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, port positions, and performance curves are strictly matched to the original YUKEN DSG-02 series valves, enabling direct drop-in replacement without modifying piping systems, 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-H10B-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.

3. The tank port (T) must be connected to the return line. Permissible back pressure must not exceed 6.3 MPa. The size 10 valve has two 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 the DIN connector for seal integrity and terminal tightness to maintain IP65 protection. Measure coil resistance and replace the coil if deviation exceeds ± 10%.

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 high-temperature applications, reduce the interval to 2,000 hours.

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.