Bosch Rexroth | 4WH16E7X
4WH16E7X/
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The 4WH16E7X/ directional spool valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and is intended for directing fluid in automated hydraulic circuits. It is hydraulically actuated, allowing remote pilot control rather than manual shifting. The valve is built in nominal size NG16 so it matches common 16 mm port patterns, and the body carries four ports to accommodate pressure, tank, and two work lines. Internally the spool offers three discrete positions following spool symbol E, which supports closed-center neutral and open flow service states. Installation is on a subplate, using the ISO 4401-07-07-0-05 interface to simplify exchange with similar valves. Proper operation is supported across a fluid viscosity window of 2.8 to 500 mm²/s and a temperature range from –20 °C to 80 °C when NBR seals are used. Cleanliness must meet ISO 4406 class 20/18/15 to protect precision edges, and the assembled unit weighs 7.3 kg.
The hydraulic capacity of the 4WH16E7X/ valve permits a continuous flow of up to 300 l/min so it can supply medium-size actuators without excessive pressure loss. Circuit safety is maintained by a maximum operating pressure of 280 bar at ports P, A, and B, while port T is limited to 250 bar to protect return-line components. The pilot stage tolerates pressure up to 250 bar, providing ample margin for reliable shifting under full load, yet the spring-centered mechanism only needs 14 bar pilot pressure to move the spool from neutral. These ratings enable the valve to function in high-pressure manifolds where rapid direction changes are required without compromising seal integrity or response time. Because the nominal flow and pressure limits are matched, designers can mount the unit close to pumps and actuators, shorten line lengths, and preserve energy efficiency in continuous-duty machinery.
Technical Specifications
Actuation
Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp Range
-20 to +80 °C (NBR)
Maximum Flow
300 l/min
Maximum Operating Pressure (p, A, B)
280 bar
Maximum Pilot Pressure
250 bar
Maximum Pressure (port T)
250 bar
Minimum Pilot Pressure (spring-centered)
14 bar
Mounting Interface
ISO 4401-07-07-0-05
Mounting Type
Subplate
Nominal Size
NG16
Number Of Ports
4
Number Of Positions
3
Spool Symbol
E
Viscosity Range
2.8 to 500 mm²/s
Weight
7.3 kg
1620 Old Apex Road
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