Bosch Rexroth | 4WEH32D6XOF6EW110N9TDA
4WEH32D6X/OF6EW110N9TDA
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The 4WEH32D6X/OF6EW110N9TDA valve is a directional spool valve produced by Bosch Rexroth for the WEH Directional Spool Valves series and is intended to route flow in hydraulic automation circuits. A nominal size of 32 sets the flow paths large enough for machines that demand high oil volume. The ISO 4401-10-09-0-05 porting pattern aligns the body with standard subplates and simplifies manifold design. With a maximum flow capability of 1100 l/min at symbol D and 70 bar, the valve supports rapid actuator movement in high-capacity systems. A maximum operating pressure of 280 bar on ports P, A, and B allows it to tolerate heavy load pressures without deformation. The pilot stage can accept up to 250 bar, so the main pressure line can be used for control without auxiliary regulators. For two-spool spring-end versions, at least 10 bar is required in the pilot line to overcome spring forces and complete a shift. Achieving a pilot flow of 45 l/min fills the 58.8 cm³ pilot chamber promptly, giving the shortest switching time for cyclic operations.
The valve remains functional in ambient temperatures from −20 to +50 °C, making it suitable for unheated plant areas. It accepts hydraulic oil between −20 and +80 °C, covering cold starts and elevated tank temperatures during continuous duty. Allowed fluid viscosity spans 2.8 to 500 mm²/s, so standard mineral oils and higher-viscosity blends can both be used. Oil cleanliness must reach ISO 4406 class 20/18/15 to prevent spool scoring and maintain tight internal leakage control. The internal Y pilot return can withstand 160 bar in AC-solenoid configurations, permitting back-pressure accumulation in closed systems. Installation requires six M20 × 80 socket head screws conforming to ISO 4762. Each screw must be tightened to 340 Nm to keep the body clamped against its subplate during pressure surges. A mean time to dangerous failure of 100 years aids reliability calculations for safety-instrumented machinery.
Technical Specifications
Ambient Temp Range (nbr)
-20 to +50 C
Cleanliness Class (iso 4406)
20/18/15
Hydraulic Fluid Temp Range (nbr)
-20 to +80 C
Max Flow (symbol D, 70 Bar)
1100 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool Spring End)
10 bar
Mounting Screws
6 × M20 × 80 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size (ng)
32
Pilot Flow For Shortest Switching
45 l/min
Pilot Return (y Internal) Max Pressure
160 bar (AC)
Pilot Volume (2-spool)
58.8 cm³
Porting Pattern
ISO 4401-10-09-0-05
Screw Tightening Torque
340 Nm
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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