Bosch Rexroth | 4WS2EM6-2X20B12ET315K17EV
4WS2EM6-2X/20B12ET315K17EV
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The 4WS2EM6-2X/20B12ET315K17EV servo valve belongs to the 4WS Servo Valves series and is manufactured by Bosch Rexroth. It regulates hydraulic flow and pressure in automation circuits. The valve delivers a rated flow of 20 l/min so actuator velocity can be set precisely, and a differential pressure of 70 bar at this flow maintains metering accuracy. A maximum operating pressure of 315 bar permits use in high-pressure manifolds. Internal pilot supply and return remove the need for external pilot lines; the pilot stage opens when at least 10 bar is available and withstands up to 315 bar. Mineral oil types HL or HLP are the approved hydraulic fluids, and FKM seals contain these fluids without degradation. The enclosure achieves IP65 to resist dust and water spray.
Analog command signals drive the electromagnetic stage for closed-loop position control. The coil presents a resistance of 85 Ω and draws a rated current of 30 mA, limiting heat generation and permitting direct interface with standard motion controllers. Inductance values of 1.0 H in series circuits and 0.25 H in parallel circuits shape the response to changing input voltage and suppress current ripple. Hydraulic cleanliness must reach ISO 4406 class 18/16/13 to prevent spool sticking and erosion. A mechanical return system recenters the spool when the command returns to neutral, providing fail-safe behavior without electronic feedback or spring sets. These electrical and fluid requirements combine to sustain consistent accuracy during prolonged service while matching the pressure and flow capabilities defined for the valve.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 18/16/13
Coil Rated Current
30 mA
Coil Resistance
85 Ω
Hydraulic Fluid
Mineral Oil (HL, HLP)
Inductance (parallel)
0.25 H
Inductance (series)
1.0 H
Max Operating Pressure
315 bar
Max Pilot Pressure
315 bar
Min Pilot Pressure
10 bar
Pilot Supply/return
Internal
Protection Class
IP 65
Rated Flow
20 l/min
Return System
Mechanical
Seal Material
FKM
Signal Type
Analog
Valve Δp For Rated Flow
70 bar
1620 Old Apex Road
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