Vickers Type SM4 Servo Valve | SM4-10 SM4-20 SM4-30 | High Response Control

Vickers Type SM4 Series High-Performance Servo Valves

Product Overview: The SM4 Series is a premier line of electro-hydraulic servo valves from Vickers, featuring a sophisticated two-stage design: a nozzle-flapper pilot stage and a four-way sliding spool output stage. This series is engineered for closed-loop control systems requiring ultra-high frequency response, minimal hysteresis, and stringent linearity. Whether utilized in hydraulic vibration tables, flight simulators, or precision machine tool positioning, the SM4 series converts electrical commands into high-performance hydraulic power with unmatched accuracy.

This category covers the full range from the compact SM4-10 to the heavy-duty SM4-40, including the precision-engineered SM4-20(15)57-80/40-10-S182.

Key Technical Advantages:

• Superior Dynamic Response: High-sensitivity nozzle-flapper technology ensures the valve tracks signals accurately even at extreme operating frequencies.

• Ultra-Low Hysteresis & Resolution: Precision-ground spool and sleeve assemblies minimize mechanical friction, enabling micron-level positioning accuracy.

• Integrated Mechanical Feedback: The spool position is linked back to the pilot stage via a feedback wire, creating a mechanical closed-loop that enhances stability and disturbance rejection.

• Ruggedized & Temperature Resistant: Designed for industrial and aerospace-grade environments, maintaining consistent control across wide temperature ranges with high vibration resistance.

Detailed Specifications & Parameters:

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

• Featured Model Matrix:

  • SM4-10 / SM4-20 / SM4-30 / SM-40 (Full scale of nominal sizes)

  • SM4-20(15)57-80/40-10-S182 (Specific precision feedback and flow rating)

• Core Performance Specs:

  • Rated Pressure: Typical operating pressure up to 210 Bar (3,000 PSI), with peaks up to 315 Bar.

  • Rated Flow Range: Spans from 3.8 L/min (1 GPM) to 151 L/min (40 GPM) depending on the size.

  • Control Signal: Driven by low-current commands (typically ±10mA to ±40mA).

  • Frequency Response: -3dB bandwidth capability reaching 60Hz – 100Hz and above.

  • Seal Compatibility: High-grade seals suitable for aircraft hydraulic fluids and industrial mineral oils.