Bosch Rexroth | H-4WEH32E6X6EG24N9K4
H-4WEH32E6X/6EG24N9K4
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The H-4WEH32E6X/6EG24N9K4 valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It directs hydraulic flow in automation systems that require rapid switching under high load. The NG32 size gives a large internal cross-section that permits up to 680 l/min when the supply reaches 350 bar. A porting pattern compliant with ISO 4401-10-09-0-05 allows straightforward manifold mounting in standardized blocks. The unit withstands 350 bar on the pressure, A, and B ports, while the tank port is limited to 250 bar to protect return lines. Operation in ambient temperatures from –20 °C to +50 °C supports outdoor or unconditioned plant locations. Electrical actuation is provided by two 24 V DC solenoids connected through a DIN EN 175301-803 K4 plug, simplifying field wiring. The assembled valve weighs 41 kg, so the mounting surface must support this mass and resist vibration.
The pilot stage accepts hydraulic oil up to 250 bar and needs at least 8.5 bar in three-position service to shift the spool, with a pilot volume of 29.4 cm³ influencing response time. It can handle fluid temperatures between –20 °C and +80 °C, covering cold-start and high-duty cycles. Correct operation requires oil viscosity between 2.8 and 500 mm²/s, ensuring predictable damping and sealing. System cleanliness has to reach ISO 4406 class 20/18/15 to limit contamination-related wear and sticking. The mean time to dangerous failure is rated at 100 years, giving a high level of functional safety for long-life machinery. Together these characteristics define the hydraulic, thermal, and reliability limits that designers must observe when integrating the valve into automated presses, molding machines, or similar equipment.
Technical Specifications
Ambient Temperature (nbr)
-20 to +50 C
Cleanliness Class
ISO 4406 (c) 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Temp (nbr)
-20 to +80 C
Max Flow At 350 Bar
680 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Tank Port Pressure (t)
250 bar
Min Pilot Pressure (3-position)
8.5 bar
Mttfd (type Weh)
100 years
Pilot Volume (3-position)
29.4 cm3
Porting Pattern
ISO 4401-10-09-0-05
Size
NG32
Supply Voltage
24 V DC
Viscosity Range
2.8 to 500 mm2/s
Weight (two Solenoids)
41.0 kg
1620 Old Apex Road
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