Bosch Rexroth | 4WSE2EM6-2X20B9ET315K17EV
4WSE2EM6-2X/20B9ET315K17EV
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The 4WSE2EM6-2X/20B9ET315K17EV valve belongs to the 4WS Servo Valves series from Bosch Rexroth and modulates flow in closed-loop hydraulic actuators. With nominal size 6, the envelope matches compact manifolds used in machine tools. A mounting pattern of ISO 4401-03-02-0-05 lets the valve bolt directly to standard CETOP 03 subplates. Under a differential pressure of 70 bar it delivers a nominal flow of 20 l/min, supporting medium-power cylinders. Continuous line pressure can reach 315 bar so the unit fits high-pressure systems. The tank port tolerates static pressure up to 10 bar and short peaks to 100 bar to protect return plumbing. An installed mass of 1.1 kg keeps handling simple during service.
The electronics accept a ±10 V command signal which sets the spool position in proportion to input voltage. A command input resistance of at least 8 kΩ ensures that the upstream controller sees minimal load. Internal circuits draw up to 150 mA on each rail from the ±15 VDC supply that must remain within ±3% to maintain calibration. The first stage is a nozzle-flapper amplifier that converts electrical current to hydraulic pilot flow for fast response. Pilot oil is supplied and returned internally (ET), removing external pilot lines and simplifying plumbing. Valve hysteresis is held below 1.5%, and inversion range stays within 0.2%, both of which improve position repeatability in servo loops. The unit is designed for mineral oil HL or HLP according to DIN 51524 to ensure seal compatibility and stable viscosity.
Technical Specifications
Command Input Resistance
≥ 8 kΩ
Command Signal
±10 V
Electronics Current
150 mA/rail (max)
Electronics Supply
±15 VDC (±3%)
First Stage
Nozzle-Flapper Amplifier
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Hysteresis
≤ 1.5%
Max Operating Pressure
315 bar
Mounting Pattern
ISO 4401-03-02-0-05
Nominal Flow (Δp=70 Bar)
20 l/min
Nominal Size
6
Pilot Oil Supply/return
Internal (ET)
Range Of Inversion
≤ 0.2%
Return Port Peak Pressure
100 bar (max)
Return Port Static Pressure
10 bar (max)
Weight
1.1 kg
1620 Old Apex Road
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