Bosch Rexroth | 4WS2EM10-5X20B11-315K31EV
4WS2EM10-5X/20B11-315K31EV
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The 4WS2EM10-5X/20B11-315K31EV servo valve belongs to the 4WS Servo Valves series and is produced by Bosch Rexroth for closed-loop hydraulic automation. It modulates flow proportionally to an electrical command so that actuators receive precise position or force control. A K31 plug according to EN 175201-804 provides the electrical connection, while a coil resistance of 85 Ω pairs with a rated coil current of 30 mA for stable magnetic actuation. Installation is done on a subplate with the ISO 4401-05-05-0-05 mounting pattern, and the body tolerates system pressures up to 315 bar. An IP65 protection class prevents dust ingress and water spray damage, the seals are FKM to withstand common hydraulic media, the accepted fluid cleanliness level is ISO 4406 18/16/13, and the assembly weighs 3.56 kg.
At a commanded center position the valve delivers a rated flow of 20 l/min when the differential pressure across the service ports is 70 bar, and manufacturing variation remains within ±10 %. When the spool reaches full stroke the passage allows up to 180 l/min, giving headroom for transient peaks. Closed-loop precision is assisted by a hysteresis not exceeding 1.5 %, a response sensitivity of 0.2 % or better, and a range of inversion held below 0.3 %, so control deviations stay minimal during direction changes. These dynamic characteristics let the component follow fast command signals and keep cylinder velocity steady across the operating envelope.
Technical Specifications
Coil Resistance
85 Ω
Electrical Connection
K31 (EN 175201-804)
Fluid Cleanliness Class
ISO 4406 18/16/13
Hysteresis
≤ 1.5%
Max Operating Pressure
315 bar
Maximum Flow
180 l/min
Mounting Pattern
ISO 4401-05-05-0-05
Protection Class
IP65
Range Of Inversion
≤ 0.3%
Rated Coil Current
30 mA
Rated Flow
20 l/min
Rated Flow Differential Pressure
70 bar
Rated Flow Tolerance
±10%
Response Sensitivity
≤ 0.2%
Seal Material
FKM
Weight
3.56 kg
1620 Old Apex Road
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