Bosch Rexroth | 4WEH16D7X6EW110N9SK4-CSA
4WEH16D7X/6EW110N9SK4 CSA
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The 4WEH16D7X/6EW110N9SK4 CSA is a directional spool valve produced by Bosch Rexroth in the WEH Directional Spool Valves series. It is built to shift hydraulic flow between actuator ports in automated machinery. Its nominal size 16 establishes the NG16 interface so the valve nests directly on common subplates. The 4/2-way function provides two discrete positions for four working ports, enabling simple extend-retract circuits. A D-coded spool sets the internal flow paths for each position to match typical cylinder control schemes. The assembly tolerates operating pressures up to 280 bar at ports P, A, and B, allowing use in medium-pressure systems. A maximum flow capacity of 300 L/min supports fast cylinder speeds without excessive pressure drop. The ISO 4401-07-07-0-05 porting pattern aligns the body with standardized manifold layouts. Four M10×60 ISO 4762 screws fasten the unit to the manifold and sustain hydraulic loads. Electrical power is fed through a DIN EN 175301-803 K4 connector, while a concealed N9 manual override lets operators shift the spool when the solenoid is de-energized.
The pilot stage is a 4WE 6E valve that modulates the main spool, giving consistent switching even under varying supply conditions. Pilot oil is routed externally at X and drained externally at Y, so the control fluid remains clean and unaffected by main-line pressure changes. The pilot circuit withstands pressures up to 250 bar, ensuring reliable actuation of the main stage. For two-spool operation, the control section only needs a minimum pilot pressure of 14 bar, which permits use in low-pressure pilot networks. Each shift consumes 11.45 cm³ of pilot oil, a volume that must be considered when sizing accumulators for rapid cycling. Acceptable fluid cleanliness is ISO 4406 class 20/18/15, limiting particulate contamination to protect precision lands. Switching time can be trimmed with supply control S to match machine response requirements.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness
ISO 4406 (20/18/15)
Manual Override
Concealed (N9)
Max Flow
300 L/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool)
14 bar
Mounting Screws
4× M10×60 (ISO 4762)
Nominal Size
16 (NG16)
Pilot Control Valve
4WE 6E
Pilot Oil Flow
X External; Y External
Pilot Volume (2-spool)
11.45 cm³
Porting Pattern
ISO 4401-07-07-0-05
Spool Symbol
D
Switching Time Adjustment
Supply Control (S)
Valve Function
4/2-Way
1620 Old Apex Road
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