Bosch Rexroth | 4WRZ25W8-325-7X6EG24N9EK4D3V
4WRZ25W8-325-7X/6EG24N9EK4/D3V
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The 4WRZ25W8-325-7X/6EG24N9EK4/D3V proportional directional valve belongs to the WRZ Proportional Directional Valves series from Bosch Rexroth. It meters flow and controls actuator direction in hydraulic automation circuits that demand fast, repeatable positioning. The main stage tolerates a maximum operating pressure of 350 bar so it can be installed in high-pressure supply lines without additional relief devices. With a nominal flow rate of 325 l/min at a 10 bar differential, the unit can drive large cylinders or motors while maintaining low pressure loss. Operational integrity is supported by HL and HLP fluids compliant with DIN 51524, and a required fluid cleanliness of 20/18/15 (ISO 4406) for the main stage prevents spool erosion. Electrical hookup is handled through a DIN EN 175301-803 connector, and, when the matching cable socket is fitted, the enclosure meets IP65 to block dust and water spray. Because the body weighs 18.2 kg, mounting plates must be rigid enough to resist vibration and dynamic loads during service.
The valve’s pilot section relies on a coil resistance of 4.8 Ω at 20 °C; this value limits inrush current and stabilizes magnetic force throughout the stroke. A continuous duty cycle of 100 % allows the solenoid to remain energized indefinitely, and a maximum coil current of 1.5 A ensures full spool travel without thermal overload. For reliable shifting, the pilot stage demands an oil flow of only 7 l/min and displaces 10 cm³ during a 0→100 % command, which keeps pump power consumption low and shortens response time. Particle contamination must not exceed 18/16/13 (ISO 4406) in the pilot gallery to protect the fine damping orifices. Port Y may see up to 30 bar, providing flexibility when routing pilot drain lines to back-pressurized tanks. External return through port T can accommodate 250 bar, whereas internal return is limited to 30 bar; these limits guide manifold design and tank line sizing. Together these parameters define safe operating envelopes for continuous, precise directional control.
Technical Specifications
Cleanliness Class (main Valve)
20/18/15 (ISO 4406)
Cleanliness Class (pilot Valve)
18/16/13 (ISO 4406)
Coil Resistance (20 °c)
4.8 Ω
Duty Cycle
100%
Electrical Connection
DIN EN 175301-803
Hydraulic Fluid
HL, HLP (DIN 51524)
Maximum Operating Pressure (main)
350 bar
Maximum Port Y Pressure
30 bar
Maximum Return Pressure (port T, Ext)
250 bar
Maximum Return Pressure (port T, Int)
30 bar
Nominal Flow (∆p=10 Bar)
325 l/min
Pilot Oil Flow (0→100% Step)
7 l/min
Pilot Oil Volume (0→100% Step)
10 cm³
Protection Class
IP65 (with cable socket)
Solenoid Max Current
1.5 A
Weight (size 25, Wrz)
18.2 kg
1620 Old Apex Road
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