Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of Vickers KDG4V in China. We warmly welcome you to wholesale bulk Vickers KDG4V for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
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The Vickers KDG4V series is a line of high-performance, direct-operated proportional directional valves designed for precise control of fluid direction and flow rate in closed-loop and open-loop hydraulic systems. Engineered for subplate mounting, this series acts as an essential electro-hydraulic control component where accurate, repeatable, and smooth actuation is required.
Key Advantages
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- Proportional Control Performance: Provides fine, step-less control of actuator speed and directional movement, minimizing hydraulic shock and mechanical wear.
- Compact & Rugged Design: Direct-operated solenoid drive in a compact ISO 4401-03 / CETOP 3 footprint, eliminating the need for pilot oil supply.
- Integrated Versatility: Available with integrated electronics (OBE) or external amplifier control, facilitating seamless integration into modern automated machinery.
- High Operational Reliability: Designed to deliver consistent hysteresis and low threshold parameters under continuous, demanding operating cycles.
Technical Specifications
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| Parameter | Value / Unit |
| Valve Size | ISO 4401-03 / CETOP 03 / NG6 |
| Maximum Operating Pressure (Ports A, B, P) | Up to 315 bar (4500 psi) |
| Maximum Allowable Tank Port Pressure (Port T) | Up to 210 bar (3000 psi) |
| Nominal Rated Flow Rate (at Δp = 10 bar) | 12 L/min, 24 L/min, or 40 L/min |
| Operating Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Fluid Viscosity Range | 10 to 380 mm²/s (cSt) |
| Recommended Fluid Cleanliness Class | ISO 4406 Class 18/16/13 (or NAS 1638 Class 7) |
| Hysteresis | < 3% of maximum signal |
| Step Response Time (0 - 100%) | ≤ 30 ms to 45 ms (configuration dependent) |
| Solenoid Coil Supply Voltage | 24V DC (standard) |
Applications
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- Plastic Injection Molding Machines: Controls ejector cylinder speed, core-pulling sequences, and mold open/close cushioning to eliminate mold impact.
- Metal Stamping Presses: Regulates pre-fill valve sequences and hydraulic die cushion cylinders for smooth sheet metal forming.
- Automotive Testing Equipment: Drives hydraulic servo actuators in dynamic load test rigs, requiring minimal hysteresis and quick transient response.
- CNC Bending & Shearing Machinery: Controls the speed and synchronization of hydraulic rams during high-precision metal bending cycles.
Related Models
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| Model Code | Description | Size | Max Pressure | Flow Rating |
| KDG4V-3-2C20N-M-U-H7-60 | Direct Proportional Valve, Closed Center Spool | ISO 03 / NG6 | 315 bar | 20 L/min |
| KDG4V-3-2C28N-M-U-H7-60 | Direct Proportional Valve, Closed Center Spool | ISO 03 / NG6 | 315 bar | 28 L/min |
| KDG4V-3-33C20N-M-U-H7-60 | Proportional Valve with Meter-in/Meter-out Spool | ISO 03 / NG6 | 315 bar | 20 L/min |
| KDG4V-3-2C08N-M-U-H7-60 | Direct Proportional Valve, Low Flow Spool | ISO 03 / NG6 | 315 bar | 8 L/min |
| KDG4V-5-2C90N-M-U-H7-20 | Higher Capacity Proportional Valve Series | ISO 05 / NG10 | 315 bar | 90 L/min |
FAQ
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Q1: How do I verify my complete KDG4V model code?
A: Check the metal nameplate located on the side of the valve body. Model codes specify series size, spool symbol, flow capacity, electrical connection, design series number, and seal material. If the nameplate is unreadable, contact our technical team with photos and mounting dimensions.
Q2: What fluid cleanliness level is required for reliable operation?
A: Proportional spools have tight manufacturing clearances. Fluid cleanliness must meet or exceed ISO 4406 Class 18/16/13. We recommend installing an inline pressure filter rated at 10 microns absolute upstream of the valve.
Q3: What type of hydraulic oil should be used?
A: Mineral-based hydraulic oils (HLP or HM types) conforming to DIN 51524 with a viscosity between 15 and 46 cSt at operating temperature are recommended. For synthetic or fire-resistant fluids, ensure FKM (Viton) seals are specified.
Contact Us
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Whether you are replacing a component or designing a new system, we provide practical solutions to help you make the right purchasing decision.
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