Bosch Rexroth | 4WS2EM10-5X20B11ET315K31BV
4WS2EM10-5X/20B11ET315K31BV
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The 4WS2EM10-5X/20B11ET315K31BV servo valve belongs to the 4WS Servo Valves series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation. It meters hydraulic oil to an actuator and stabilizes motion using a two-stage layout; the pilot stage drives the main spool, so the number of stages is 2 for accurate positioning. A rated flow of 20 l/min allows controlled cylinder or motor speed, while the flow figure is referenced to a pressure differential of 70 bar to maintain predictable gain. The assembly withstands a maximum operating pressure of 315 bar, enabling use in high-pressure circuits. Internal pilot oil supply and return simplify external piping because no separate pilot lines are required. The porting pattern follows ISO 4401-05-05-0-05, making the valve interchangeable on standard subplates. It is intended for use with HL or HLP fluids to DIN 51524, ensuring compatibility with common mineral hydraulic oils.
Each magnetic torque motor pulls 30 mA at rated command current, and a coil resistance of 85 Ω defines the load presented to external control electronics, which are located outside the valve body for easier maintenance. Electrical connection is provided through an EN 175201-804 plug, giving a keyed, vibration-resistant interface. The enclosure carries an IP65 protection class, preventing dust ingress and guarding against low-pressure water jets in typical machine environments. An FKM seal set withstands mineral oil and elevated temperatures, preserving leakage control. The valve relies on a mechanical return system to center the spool when power is removed, assuring failsafe neutral. Fluid cleanliness must not exceed ISO 4406 (c) 18/16/13 so that the precision orifices remain free of contamination. The unit weighs 3.56 kg, a factor that should be considered when selecting manifold support hardware.
Technical Specifications
Coil Resistance
85 Ω
Control Electronics
External
Electrical Connector
EN 175201-804
Fluid Cleanliness
ISO 4406 (c) 18/16/13
Hydraulic Fluid
HL, HLP (DIN 51524)
Max Operating Pressure
315 bar
Number Of Stages
2
Pilot Oil Supply/return
Internal
Porting Pattern
ISO 4401-05-05-0-05
Protection Class
IP65
Rated Current Per Coil
30 mA
Rated Flow
20 l/min
Rated Flow Pressure Differential
70 bar
Return System
Mechanical
Seal Material
FKM
Weight
3.56 kg
1620 Old Apex Road
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