Pilot operated proportional directional valves

Sizes 10 to 27

Up to 350 bar , Up to 600L/min

  • Pilot valve NG6, with control spool and sleeve in servo quality, actuated on one side, 4/4 fail-safe position whenswitched off
  • Control solenoid with electrical position feedback and electronics for position transducer (Lvdt DC/DC)
  • Main stage in servo quality with position feedback
  • Pilot operated 4/3-way servo solenoid directional control valves NG10 to NG27
General
Design  Spool type valve, pilot operated
Construction  Servo solenoid directional control valve NG6, with position controller for pilot valve and main stage
Type of mounting  Subplate, mounting hole configuration NG10…27 to ISO 4401-…
Installation position  Optional
Ambient temperature range  –20…+50
Weight kg  NG10  8.35  NG16  10  NG25  18  NG27  18
Vibration resistance, test condition  Max.25g, shaken in 3 dimensions(24 h)
 
Hydraulic (measured with HLP 46, t= 40 ℃ ±5 ℃)
Pressure fluid  Hydraulic oil to DIN 51524…535, other fluids after prior consultation
Viscosity range Recommended mm2/s  20…100
Max. permitted mm2/s  10…800
Maximum permissible degree of contamination of pressure fluid. Purity class to ISO 4406 (c)  Class 18/16/13  1) 
Flow direction  See symbol
Nominal flow at ∆p = 5 bar per notch  2) L/min  NG10 NG16 NG25 NG27
 see specifications
Max. working pressure Ports P, A, B External control oil inlet bar 350 350 350 280
Ports P, A, B Internal control oil inlet bar 280
 Ports T, X, Y bar 250
Min. control oil pressure in “pilot stage” bar 10
Qmax L/min 170 450 900 1000
QN pilot valve  Δp = 35 bar L/min 4 12 24 24
Leakage of pilot valve at 100 bar L/min < 180 < 350 < 500 < 500
Leakage of main stage (symbols “E”) at 100 bar L/min <0.25 < 0.4 < 0.6 < 0.6
 
Static/Dynamic
Hysteresis % < 0.1, scarcely measurable
Manufacturing tolerance for Qmax % ≦ 10
Response time for signal change (at X = 100 bar) 0…100 % 25 26 32 32
0…10  % 14 15 18 18
Response time for signal change (at X = 10 bar) 0…100 % 85 80 120 120
0…10  % 50 30 50 50
Switch-off behavior After electrical switch-off: pilot valve in fail-safe. Main stage moves to spring-centered “mid position”
Thermal drift Zero point displacement < 1 % at ∆T = 40 ℃
Zero adjustment Adjustable ±5 % via valve amplifier
1) The purity classes stated for the components must be complied with in hydraulic systems. Effective filtration prevents problems and also extends the service life of components.

4WRLE Pilot Operated Proportional Directional Valve

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