Bosch Rexroth | 4WS2EM6-2X2B12ET210K17EV
4WS2EM6-2X/2B12ET210K17EV
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The 4WS2EM6-2X/2B12ET210K17EV servo valve belongs to the 4WS Servo Valves series from Bosch Rexroth and functions as a directional flow control element in hydraulic automation systems. With a nominal size of 6, it integrates into compact circuits where precise metering is needed. The nominal flow of 2 l/min at a 70 bar differential pressure defines the baseline actuator speed the valve can support. A maximum operating pressure of 210 bar permits use in medium-pressure power units without derating. Subplate mounting simplifies service replacement and aligns the ports according to the ISO 4401-03-02-0-05 pattern, ensuring interchangeability with standard manifolds. Pilot oil is supplied and drained internally, so no external pilot lines are required. Operation demands hydraulic fluid that meets DIN 51524 HL or HLP mineral-oil grades, and the cleanliness class of 18/16/13 per ISO 4406 must be maintained to avoid spool wear and signal drift.
Each electromagnetic stage draws a nominal current of 30 mA, which allows direct drive from most servo amplifiers while limiting heat generation. A coil resistance of 85 Ω defines the voltage range necessary to achieve that current, and paired inductance values of 0.25 H in parallel or 1.0 H in series influence the amplifier’s dither and response tuning. The K17 male connector provides the electrical interface, offering quick disconnection during maintenance. An IP65 degree of protection shields the enclosure against dust ingress and low-pressure water jets in industrial environments. The hydraulic path withstands fluid temperatures up to 100 °C, supporting short-term peaks during start-up or elevated ambient conditions. Overall weight is 1.1 kg, so the valve can be handled without lifting equipment and places minimal load on the manifold studs.
Technical Specifications
Cleanliness Class
18/16/13 (ISO 4406)
Coil Resistance
85 Ω
Degree Of Protection
IP65
Electrical Connection
K17 (male connector)
Hydraulic Fluid
Mineral Oil (HL, HLP) (DIN 51524)
Hydraulic Fluid Max Temp
100 °C
Inductance (parallel)
0.25 H
Inductance (series)
1.0 H
Max Operating Pressure
210 bar
Mounting
Subplate
Nominal Current Per Coil
30 mA
Nominal Flow (Δp 70 Bar)
2 l/min
Nominal Size
6
Pilot Oil Configuration
Internal (supply and drain)
Porting Pattern
ISO 4401-03-02-0-05
Weight
1.1 kg
1620 Old Apex Road
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