Bosch Rexroth | 4WRZ25W8-220-7X6EG24N9ETK4V
4WRZ25W8-220-7X/6EG24N9ETK4/V
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The 4WRZ25W8-220-7X/6EG24N9ETK4/V valve belongs to the WRZ Proportional Directional Valves series from Bosch Rexroth and regulates fluid direction and flow in automated hydraulic systems. It delivers a nominal flow of 220 l/min at a 10 bar pressure drop to drive large cylinders or motors efficiently, while the main stage tolerates 350 bar operating pressure for high-power circuits. Mineral oil grades HL and HLP to DIN 51524 are required, and the viscosity window of 20 to 380 mm²/s defines acceptable fluid thickness for consistent metering. The porting pattern follows ISO 4401-08-07-0-94 so the unit fits standard sub-plates, and ports A, B, and T use 25 mm passages whereas port P is 24 mm, setting the mechanical interface for supply and work lines. Cleanliness of the main valve must reach class 20/18/15 per ISO 4406 to avoid spool sticking and erosion.
The pilot stage draws 7 l/min during a full command change, giving smooth proportional control without excessive drain losses. A coil resistance of 4.8 Ω at 20 °C and a maximum current of 1.5 A determine the drive amplifier sizing, and the winding can endure up to 150 °C, allowing operation near hot manifolds. Electrical connection is made through a DIN EN 175301-803 plug that simplifies coil exchange, and the housing achieves an IP65 rating to block dust and water jets on the machine floor. Internal drainage limits port T pressure to 30 bar to protect seals and pilot passages.
Technical Specifications
Cleanliness Class (main Valve)
20/18/15 (ISO 4406)
Coil Resistance (20 °c)
4.8 Ω
Electrical Connection
DIN EN 175301-803
Hydraulic Fluid
Mineral Oil (HL, HLP) to DIN 51524
Max Coil Temperature
150 °C
Max Current
1.5 A
Max Operating Pressure (main)
350 bar
Nominal Flow (∆p=10 Bar)
220 l/min
Pilot Oil Flow (0–100% Step)
7 l/min
Port A/b/t Diameter
25 mm
Port P Diameter
24 mm
Port T Pressure (internal Drain)
30 bar
Porting Pattern
ISO 4401-08-07-0-94
Protection Rating
IP65
Viscosity Range
20 to 380 mm²/s
1620 Old Apex Road
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