Product Overview The Vickers KBSDG Series is a 4-way solenoid-operated proportional valve designed for high dynamic performance. Unlike standard proportional valves, the KBSDG series employs a “Zero Overlap” (critical center) spool and a high-performance solenoid drive. The built-in LVDT continuously monitors the spool position and feeds this data back to the integrated amplifier, correcting any errors instantly. This allows the valve to achieve near-zero hysteresis and excellent repeatability, making it a rugged, cost-effective alternative to delicate flapper-nozzle servo valves (like the SM4 series).
Why Choose Vickers DG Servo Valves?
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Servo-Level Precision: The zero-lap spool combined with electronic feedback provides precise metering control right from the start of the signal, eliminating the “deadband” found in standard valves.
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Rugged Durability: Unlike nozzle-flapper servo valves that are sensitive to oil contamination, the DG spool design is more tolerant of dirty environments, reducing maintenance costs.
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Plug-and-Play: The OBE (On-Board Electronics) version simplifies wiring. Factory-calibrated gain and offset mean no complex tuning is required during installation.
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High Dynamics: Capable of step response times as fast as 12ms and frequency response typically exceeding 60-80 Hz, suitable for rapid-cycle machinery.
Difference: KBSDG vs. SM4 Servo
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KBSDG (DG Servo): Spool-type design, electrically driven. Better contamination tolerance, lower cost. Ideal for most industrial automation.
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SM4 (Jet-Pipe/Flapper): Traditional mechanical feedback servo. Higher frequency response (>100Hz) but very sensitive to oil cleanliness. Choose SM4 only for extreme aerospace-grade dynamic requirements.
Common Applications:
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Plastic Machinery: Injection unit velocity profile control.
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Metal Forming: Press brake synchronization and pressure control.
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Die Casting: Shot control systems.
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Test Equipment: Fatigue testing actuators.
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Wood Processing: Saw positioning.
| Specification |
Value / Description
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| Product Type |
Servo-Performance Proportional Directional Valve
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| Series |
KBSDG4V (Integrated Amp) / KSDG4V (No Amp)
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| Mounting Interface |
Size 03: ISO 4401-03 (NG6) / NFPA D03Size 05: ISO 4401-05 (NG10) / NFPA D05
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| Max. Operating Pressure |
350 bar (5000 psi) – Ports P, A, B, T
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| Rated Flow (QN) |
Size 03: 12, 24, 40 l/min (at Δp=35 bar)Size 05: 25, 50, 80 l/min (at Δp=35 bar)
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| Spool Type |
Zero Overlap (Code 9): Critical center for servo controlLinear (Code L): Standard proportional metering
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| Step Response (0-100%) | ~12 – 20 ms |
| Hysteresis |
< 0.5% (with feedback)
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| Supply Voltage (OBE) |
24 VDC (Standard 7-Pin Connector)
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| Command Signal |
±10V (Voltage) or 4-20mA (Current)
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| Common Part Numbers |
Model Code: KBSDG4V-[Size]-[Spool]-[Flow]-[Offset]-[Voltage]KBSDG4V-3-92L-24-M-U1-H7-20 (Size 3, Zero Lap, 24L/min, OBE)KBSDG4V-3-92L-40-M-U1-H7-20 (Size 3, Zero Lap, 40L/min, OBE)KBSDG4V-5-92L-80-M-U1-H7-20 (Size 5, Zero Lap, 80L/min, OBE)KSDG4V-3-92L-24… (External Amp Version)Note: “92L” indicates a zero-overlap linear spool, critical for servo applications.
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Eaton Vickers DG Series Servo-Performance Valve Faqs:
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Q: Can I replace a standard DG4V on/off valve with this?
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A: Physically yes (same mounting pattern), but electrically no. This valve requires a 24V power supply and an analog command signal (±10V) to operate, unlike a simple on/off switch.
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Q: What is “Zero Overlap”?
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A: Standard valves have a “dead zone” where the spool moves but no oil flows. “Zero Overlap” spools (Code 9) start flowing oil immediately upon movement, which is essential for precise positioning loops.
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