Bosch Rexroth | 4WEH16G7X6EG12N9DA
4WEH16G7X/6EG12N9DA
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The 4WEH16G7X/6EG12N9DA valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for directing hydraulic oil in automated systems. It employs a G spool with three positions and spring centering so the operator can shift flow to either service line or return to a blocked neutral state. Nominal size NG16 establishes the mounting face and matches the required flow range, while a maximum flow of 300 l/min accommodates medium-capacity circuits without excessive pressure loss. The ISO 4401-07-07-0-05 porting pattern aligns the valve body with standardized subplates for quick installation. Two pilot solenoids allow electrical actuation in both directions, and their coils operate at 12 V DC to integrate with low-voltage control modules. Pilot oil is supplied externally through port X and returned through port Y, separating pilot fluid from the main flow to reduce temperature rise. A concealed manual override identified as N9 permits local shifting when electrical power is unavailable.
The spring-centered pilot section encloses a volume of 5.72 cm³, setting the amount of fluid that must be displaced during every actuation and influencing response time. Fluid cleanliness is limited to ISO 4406 (c) 20/18/15 so that spool lands and seals remain free of abrasive wear. A maximum pilot pressure of 250 bar ensures reliable shifting force, whereas a minimum pilot pressure of 14 bar is required to move the spool from its centered position. Working ports P, A, and B may be pressurized up to 280 bar for high-load cylinders, and port T can handle up to 250 bar during dynamic return conditions. Port Y is rated for 210 bar when used as an external drain in direct-current applications, preventing backpressure on the pilot stage.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Manual Override
Concealed (N9)
Max Flow
300 l/min (Symbol G, NG16)
Max P/a/b Pressure
280 bar
Max Port T Pressure
250 bar
Max Port Y Pressure
210 bar (External, DC)
Maximum Pilot Pressure
250 bar
Minimum Pilot Pressure
14 bar (X External)
Nominal Size
NG16
Pilot Oil Return
Y External
Pilot Oil Supply
X External
Pilot Solenoids
2
Pilot Voltage
12 V DC
Pilot Volume
5.72 cm3 (Spring-Centered)
Porting Pattern
ISO 4401-07-07-0-05
Spool Type
G (3-Position, Spring-Centered)
1620 Old Apex Road
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