Bosch Rexroth | 4WEH16G7X6EG12N9TDA
4WEH16G7X/6EG12N9TDA
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The 4WEH16G7X/6EG12N9TDA directional spool valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. It directs pressurized fluid to actuators in hydraulic automation circuits. The nominal size NG16 establishes passage diameters suitable for medium flow machinery, and the 4-way configuration provides separate pressure, tank, and two work ports for bidirectional cylinder control. At ports P, A, and B it tolerates up to 280 bar, enabling operation in high-pressure mobile or industrial systems. When the circuit follows symbol G at this pressure, the valve passes as much as 210 l/min to support rapid actuator speeds. External pilot supply through port X isolates the control stage from load pressure, while internal pilot return via port T simplifies plumbing. A spring-centered design needs at least 14 bar pilot pressure to shift the spool, and the pilot stage withstands up to 250 bar without damage.
Pilot return flow must stay below 210 bar so the control section can discharge without overstressing seals, while the tank port handles up to 250 bar to suit circuits with back-pressure. The valve uses hydraulic fluid filtered to ISO 4406 cleanliness code 20/18/15 to protect the precision lands from wear. A porting pattern of ISO 4401-07-07-0-05 aligns the body with standard NG16 subplates, and the mounting style is subplate mounting to allow replacement without disturbing hard plumbing. Installation employs four M10 × 60 screws per ISO 4762 to provide adequate clamping force. A maximum surface coating thickness of 100 µm shields the exterior against corrosion while preserving dimensional accuracy. The mean time to dangerous failure is 100 years, supporting long service intervals in safety-related hydraulic controls.
Technical Specifications
Fluid Cleanliness
20/18/15 (ISO 4406)
Max Flow (symbol G, 280 Bar)
210 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y, Dc)
210 bar
Max Tank Port Pressure
250 bar
Min Pilot Pressure (spring-centered)
14 bar
Mounting Screws
M10 x 60 (ISO 4762)
Mounting Type
Subplate Mounting
Mttfd
100 years
Nominal Size
NG16
Pilot Return
Internal (T)
Pilot Supply
External (X)
Porting Pattern
ISO 4401-07-07-0-05
Surface Coating Thickness (max)
100 µm
Way Configuration
4-Way
1620 Old Apex Road
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