Bosch Rexroth | 4WEH32H6X6EG12N9TDALP45
4WEH32H6X/6EG12N9TDAL/P4.5
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The 4WEH32H6X/6EG12N9TDAL/P4.5 directional spool valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth to shift hydraulic flow paths in automated machinery. It uses size NG32 to fit manifolds that follow standard port geometry, and its 4-way configuration provides four working passages for bidirectional actuator control. A maximum operating pressure of 350 bar on ports P, A, and B lets the unit work with high-pressure circuits, while a flow capacity of 1100 l/min supports large cylinder or motor volumes. An external pilot supply at port X keeps control oil independent from the main flow, and an internal pilot return at port T routes exhaust oil back to tank without extra plumbing. The pilot circuit may be pressurized up to 250 bar, and allowable fluid viscosity reaches 500 mm²/s to handle thicker oils during cold starts.
System cleanliness must remain at ISO 4406 code 20/18/15 to protect the spool and seats from wear. A concealed manual override lets technicians shift the valve during commissioning without exposing the mechanism to contaminants. Tank port T may be subjected to 210 bar, enabling back-pressure installation on return lines. The cartridge mounts with six M20 × 80 screws, each tightened to 340 Nm, to secure the body against manifold loading. Its porting pattern follows ISO 4401-10-09-0-05 so it aligns with common sub-plates in large press or marine systems. The integrated preload valve opens at 4.5 bar to maintain pilot readiness before actuation. Minimum usable fluid viscosity is 2.8 mm²/s, ensuring stable lubrication at elevated temperatures.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Manual Override
Concealed
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Tank Port Pressure (internal Return)
210 bar
Maximum Flow
1100 l/min
Mounting Screw Torque
340 Nm
Mounting Screws
M20 x 80 (6 pcs)
Pilot Return
Internal (T)
Pilot Supply
External (X)
Porting Pattern
ISO 4401-10-09-0-05
Preload Valve Cracking Pressure
4.5 bar
Size
NG32
Viscosity Maximum
500 mm2/s
Viscosity Minimum
2.8 mm2/s
Way Configuration
4-Way
1620 Old Apex Road
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