Vickers SM4-40 Servo Valve | SM4-40(40)151-80/40-10-H919H | S205 | High Flow & Response

Vickers Type SM4-40 Series High-Flow Two-Stage Servo Valves

Product Overview: The Vickers SM4-20 Series defines the pinnacle of high-power servo performance in industrial control. As a two-stage electro-hydraulic servo valve, it combines an ultra-sensitive nozzle-flapper pilot stage with a large-diameter four-way sliding spool output stage. This series manages massive hydraulic flow while maintaining exceptional frequency response. The SM4-40 is extensively utilized in large-scale systems requiring precise closed-loop control of position, velocity, and force, such as heavy-duty material testing rigs, motion bases for large flight simulators, and synchronized hydraulic presses.

Featured on this page are the high-response customized model SM4-40(40)151-80/40-10-H919H and the high-reliability specification SM4-40(40)151-80/40-10-S205.

Key Technical Advantages:

• Superior Power Density: Delivers servo-grade linearity at Size 40 dimensions, enabling micron-level regulation for ultra-high flow rates.

• High Dynamic Response: Despite its large scale, the optimized pilot drive ensures excellent phase characteristics within the 50-80Hz range.

• H919H/S205 Specialized Configs: Factory-calibrated for specific closed-loop feedback, offering enhanced robustness under complex non-linear load conditions.

• Precision Mechanical Feedback: An integrated high-precision feedback wire provides real-time spool positioning to the pilot stage, effectively eliminating null shift and ensuring consistent long-term control.

Detailed Specifications & Parameters:

• Core Series: Vickers SM4-40 High-Performance Series.

• Featured Model Matrix:

  • SM4-40(40)151-80/40-10-H919H (Advanced feedback performance)

  • SM4-40(40)151-80/40-10-H919 (Standard high-flow servo spec)

  • SM4-40(40)151-80/40-10-S205 (Industrial custom precision sequence)

• Core Performance Specs:

  • Nominal Size: Size 40 (Two-stage servo architecture).

  • Max Operating Pressure: Rated at 210 Bar (3,000 PSI), with peaks up to 315 Bar.

  • Rated Flow Capacity: Flows ranging from 151 L/min up to 180 L/min at specified pressure drops.

  • Control Command: Low-current analog servo signals (±10mA, ±40mA, or ±200mA).

  • Design Sequence: 10 Series.