Bosch Rexroth | 4WRBKE27R5-430SJ-1X6ZG24EK31A1D3M-903
4WRBKE27R5-430SJ-1X/6ZG24EK31/A1D3M-903
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The 4WRBKE27R5-430SJ-1X/6ZG24EK31/A1D3M-903 valve belongs to the 4WRBKE OBE Valves series and is manufactured by Bosch Rexroth for hydraulic automation tasks that require proportional flow control. It uses the ISO 4401-08-07-0-94 mounting interface and is classified with a nominal size of 27. The main spool travels 10 mm, with port B-p beginning to open at 50 % of that travel and the commanded switching point defined at 55 %. At 65 % stroke the B-t path is fully closed. Electrical power is supplied at 24 V DC through an EN 175201-804 plug. The pilot stage needs at least 15 bar to shift the main spool and consumes 22 l/min at a 5 bar differential. These parameters, together with an 18.8 kg mass, define handling, wiring, and pilot supply requirements during installation.
The valve withstands 280 bar on ports p, A, and B, enabling high-pressure actuation. When the tank return is connected externally, port T accepts up to 250 bar; with internal drainage that limit drops to 50 bar. A 10 bar pressure drop across the main stage yields a nominal flow of 430 l/min, while the channel geometry permits a peak flow (Qmax) of 1200 l/min for short transients. The link between these flow figures and the stated pressure capacities provides predictable metering across the usable stroke range. At nominal conditions the 10 bar differential establishes the sizing point for the spool lands, ensuring linear response as demand approaches the 430 l/min rating.
Technical Specifications
B–p Opens
50% Stroke
B–t Closes
65% Stroke
Electrical Connection
EN 175201-804 Plug
Max Pressure In T (y=external)
250 bar
Max Pressure In T (y=internal)
50 bar
Max Working Pressure (p, A, B)
280 bar
Minimum Pilot Control Pressure
15 bar
Mounting Interface
ISO 4401-08-07-0-94
Nominal Flow Rate (Δp 10 Bar)
430 l/min
Nominal Size (ng)
27
Pilot Valve Supply Flow (Δp 5 Bar)
22 l/min
Qmax
1200 l/min
Spool Stroke (main Stage)
10 mm
Supply Voltage
24 V DC
Switching Point
55% Stroke
Weight
18.8 kg
1620 Old Apex Road
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