4/3 Directional Servo Valves

This pilot operated valve with electrical position feedback provides bi-directional flow control in applications from 80 to 1 100 litres per minute. (Lvdt DC/DC ±10V).

View our detailed specifications below

Servo Valve specifications

  • Sizes: (NG) 10, 16, 25, 27, 35
  • Unit series: 3X
  • Maximum working pressure: P, A, B 350 bar (NG27: 280 bar)
  • Nominal flow rate: 80...1100 l/min (Δp = 10 bar)


  • Pilot operated 4/3-way servo solenoid directional control valves NG10 to NG35,
    with approx. 20 % overlap
  • Pilot valve NG6, with control piston and sleeve in servo quality,
    actuated on one side, 4/4 fail-safe position when switched off
  • Control solenoid with electrical position feedback and electronics for position transducer (Lvdt DC/DC)
  • Main stage with position feedback
  • Spool with linear travel, with anti-rotation element

Flow characteristic

  • S = Progressive
  • NG16, 25 and 27 with load tap C1/C2

Subplate attachment mounting hole configuration NG10

  • ISO 4401-05-05-0-05
  • NG16 to ISO 4401-07-07-0-05
  • NG25/27 to ISO 4401-08-08-0-05
  • NG35 to ISO 4401-10-09-0-05

External trigger electronics (order separately)

  • Electric amplifier for standard curve without ramps
  • Electric amplifier with ramps and dead-band compensation

Speak to our hydraulics division about your factory automation


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