Nachi Directional Control Valve

Product Overview

Key Advantages

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• High Pressure & Compact Design: Capable of handling operating pressures up to 35 MPa (350 bar) with optimized flow paths that minimize pressure drop and fluid resistance.
• High Reliability & Long Service Life: Features wet-armature solenoids submerged in system oil, providing excellent heat dissipation, quiet operation, and wear reduction.
• Fast Response & Stable Switching: Delivers precise spool shifting with low hysteresis, enabling consistent dynamic performance under heavy continuous loads.
• Global Compatibility: Standardized mounting patterns conforming to ISO 4401 (CETOP / NFPA) ensure seamless integration and direct replacement capability across global industrial machinery.

Technical Specifications

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Configuration Options

• Valve Structure: 3-Way or 4-Way spool type, available in 2-position or 3-position configurations.
• Control / Actuation Method: Solenoid operated (AC/DC), direct acting or pilot operated for larger sizes. Manual override buttons included as standard.
• Feedback Options: Optional mechanical limit switch or inductive position sensor for spool status verification.
• Spool Types: Standard spool functions including Open Center (Type C), Closed Center (Type E), Tandem (Type G), All Ports Blocked (Type D), and Regenerative spools.
• Mounting Style: Subplate / Manifold mounting conforming to ISO 4401-03 (Size 06) and ISO 4401-05 (Size 10).
• Electrical Configurations:
• Voltage Options: DC 12V, DC 24V, AC 110V (50/60Hz), AC 220V (50/60Hz).
• Terminal Types: DIN 43650 Plug-in Connector (with or without LED indicator), Conduit Box, or Flying Leads.
• Protection Rating: IP65 standard for dust and water ingress protection.

Key Materials and Components

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• Valve Body: High-tensile strength shell-mold cast iron (Ductile Iron), providing exceptional rigidity and minimal internal deformation under maximum working pressure.
• Control Spool: Alloy steel, hardened via precision heat treatment, ground, and micro-finished to maintain strict spool-to-bore clearances and reduce internal leakage.
• Solenoid Armature Tube: Heavy-duty stainless steel wet-pin armature tube engineered for high burst pressure and continuous duty cycle.
• Internal Seals: High-grade NBR (Nitrile Rubber) seals for standard petroleum-based hydraulic fluids; optional FKM (Viton) seals for phosphate ester or high-temperature synthetic fluids.
• Springs: High-fatigue-resistant alloy steel springs designed to ensure reliable spool centering through millions of cycles.

Applications

• Metal Stamping & Hydraulic Presses: Performs high-speed directional control of press cylinders, managing primary ram lowering, holding, and swift retraction.
• Injection Molding Machines: Controls core pull mechanisms, ejector pins, and clamping cylinder direction during high-tonnage molding cycles.
• CNC Machine Tools: Controls hydraulic clamping fixtures, workhead positioning, and automated tool changer mechanisms requiring tight response accuracy.
• Steel & Metallurgical Machinery: Used in rolling mill auxiliary hydraulics, controlling tilting tables, guide arms, and roll positioning systems under harsh high-temperature conditions.
• Construction & Material Handling Equipment: Regulates steering, boom extension, and winch rotation on mobile machinery sub-manifolds.

Related Models

FAQ

Q: Can Nachi directional valves be directly interchanged with other brands?

A: Yes, as long as the mounting pattern (ISO 4401), spool center position, fluid ports, and solenoid voltage match, Nachi valves can replace equivalent models from Rexroth, Vickers, or Yuken smoothly.

Q: Can Nachi directional valves be directly interchanged with other brands?

A: Yes, as long as the mounting pattern (ISO 4401), spool center position, fluid ports, and solenoid voltage match, Nachi valves can replace equivalent models from Rexroth, Vickers, or Yuken smoothly.

Q: Are Nachi subplate mounting patterns interchangeable with other brands?

A: Yes. Sizes G01 (NG6/CETOP 3) and G03 (NG10/CETOP 5) follow standard ISO 4401 mounting dimensions, making them directly interchangeable with standard subplates from Rexroth, Yuken, and Vickers.

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Product Overview

The Nachi SS-G03-C5-FR-E2-22 is a premium-grade, wet-type solenoid operated directional control valve. Engineered by Nachi-Fujikoshi, a world leader in hydraulic equipment, this valve is designed to direct and manage fluid flow within complex hydraulic systems. It utilizes high-efficiency solenoids integrated into an oil bath, ensuring extremely quiet operation, reduced wear, and an exceptionally long service life.

Key Advantages

• Wet-Type Solenoid Design: Fluid cushions the moving core, minimizing impact noise and virtually eliminating external oil leakage.

  High Pressure & Flow Capacity: Handles heavy-duty demands comfortably within a compact frame.

  Low Power Consumption: Optimized electrical coils reduce energy usage and minimize heat buildup.

  Reliable Switching: Delivers robust, stable spool transition even under maximum pressure and prolonged operation.

  Easy Maintenance: Features a plug-in electrical connection for quick assembly, troubleshooting, and replacement.

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Technical Specifications

Applications

Related Models

FAQ

Q1: What does the "Wet-Type" design mean for this valve?

A1: A wet-type solenoid valve contains a core armature immersed directly in the hydraulic system's oil. The oil cushions mechanical impacts when the valve switches, drastically lowering operational noise, reducing wear on parts, and eliminating the need for dynamic shaft seals that could leak over time.

Q2: Can I use this valve with a 110V or 24V system?

A2: No. The "E2" in the specific model number indicates that this valve requires a 200V AC electrical power source. Applying 110V AC or 24V DC will cause the valve to fail to actuate or permanently damage the electrical coil. For other voltages, you must select a matching model, such as the "D2" version for 24V DC.

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