Bosch Rexroth | 4WRZ25W6-325-7X6EG24N9ETK4V
4WRZ25W6-325-7X/6EG24N9ETK4/V
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The 4WRZ25W6-325-7X/6EG24N9ETK4/V proportional directional valve belongs to the WRZ Proportional Directional Valves series from Bosch Rexroth and is used to meter flow and set actuator direction in hydraulic automation circuits. A nominal flow of 325 l/min at a 10 bar differential lets the valve handle high-volume systems, while a maximum operating pressure of 350 bar allows it to work in demanding pressure ranges. The ISO 4401-08-07-0-94 mounting interface fits standard subplates so installation remains straightforward. A 24 V DC supply energizes the solenoid, and the required drive electronics must limit current to the 1.5 A maximum stated for the coil. Electrical hookup is completed through a DIN EN 175301-803 plug coded K4, and the assembled unit reaches an IP65 protection level when a matching cable socket is fitted. Pilot oil is supplied and drained internally (code ET), eliminating external pilot lines and simplifying manifold layouts.
The pilot stage must follow ISO 4406 class 18/16/13 cleanliness to prevent wear and sticking. Acceptable fluid temperature extends from –20 °C to +80 °C, so the valve can operate in both cold startups and elevated ambient conditions. It is intended for mineral oil of types HL or HLP according to DIN 51524, and the design accommodates viscosities between 20 and 380 mm²/s for stable film formation across normal operating ranges. Hysteresis is limited to 6 percent, providing predictable flow control during repetitive command cycles. A concealed manual override (code N9) permits mechanical shifting for setup or emergency use without exposing the mechanism to contamination. The solenoid has a resistance of 4.8 Ω at 20 °C, which assists drive modules in confirming coil integrity and setting current limits, and its winding insulation sustains temperatures up to 150 °C to guard against thermal overload.
Technical Specifications
Cleanliness Class (pilot)
ISO 4406 18/16/13
Electrical Connection
DIN EN 175301-803 Plug (K4)
Fluid Temp Range
−20 to +80 °C
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Hysteresis
6% max
Manual Override
Concealed (N9)
Max Coil Temperature
150 °C
Max Current
1.5 A
Max Operating Pressure
350 bar
Mounting Interface
ISO 4401-08-07-0-94
Nominal Flow (Δp = 10 Bar)
325 l/min
Pilot Oil Supply/drain
Internal (ET)
Solenoid Coil Resistance (20 °c)
4.8 Ω
Supply Voltage
24 V DC
Type Of Protection
IP65 (with cable socket)
Viscosity Range
20 to 380 mm²/s
1620 Old Apex Road
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