Bosch Rexroth R901278781 4WE10F5X/EG24N9K4/M Directional Spool Valve
Overview
The Bosch Rexroth R901278781 is the material number of the directional spool valve type 4WE10F5X/EG24N9K4/M. Rexroth describes it as a size 10 valve with symbol F and solenoid actuation at 24 VDC. It belongs to the WE size 10, component series 5X family covered by Rexroth data sheet RE 23340, a direct operated design with high-power solenoids for subplate mounting on the ISO 4401-05-04-0-05 porting pattern. According to the Rexroth product data, the Rexroth R901278781 has four ports and three switching positions, a maximum operating pressure of 350 bar, a maximum flow of 90 l/min for this configuration, and a weight of about 5.5 kg.
Seven Star LLC supplies the Rexroth R901278781 and other Rexroth hydraulic valves to machine builders, hydraulic workshops, steel and cement plants, marine operators and oil and gas maintenance teams across the Sultanate of Oman and the GCC. Our Muscat team checks the full type code on the existing valve nameplate against Rexroth data before supply, and we provide engineering support in Muscat for hydraulic components.
Operating Principle of the Rexroth R901278781
A directional spool valve controls the start, stop and direction of flow in a hydraulic circuit. Inside the Rexroth R901278781 a precision spool slides in a bore in the cast housing and connects or blocks the ports P (pressure), T (tank), A and B (actuator ports). The valve is direct operated: each end carries a solenoid, and when a solenoid is energised its armature pushes the spool out of its spring-centred middle position into one of the two outer switching positions. When the solenoid is de-energised, return springs bring the spool back to the centre position, whose flow path is defined by symbol F in the RE 23340 symbol table.
Rexroth notes that any simultaneous actuation of both solenoids of one valve must be ruled out. The solenoids in the type code letter E are high-power wet-pin solenoids with detachable coils, meaning the armature runs in hydraulic fluid inside a pressure-tight pole tube, while the coil can be removed and replaced without opening the hydraulic circuit. As general background, this design allows coil replacement in the field without draining the system.
Engineering Design of the Rexroth R901278781
The type code of the Rexroth R901278781 can be read from RE 23340. 4 means four main ports, WE is the directional valve, 10 is the size, F is the spool symbol, 5X is component series 50 to 59 with unchanged installation dimensions, E is the high-power wet-pin solenoid with detachable coil, G24 is 24 V DC, N9 is the concealed manual override (standard), K4 is the individual electrical connection with a 3-pole (2 + PE) connector to DIN EN 175301-803, and M is NBR seals. Rexroth gives a rated current of 1.61 A at 24 V and a nominal power of 40 W for the DC coil, continuous duty S1, and IP65 protection with a correctly mounted mating connector.
Hydraulically, ports A, B and P are rated to 350 bar, and port T to 210 bar for DC versions. Rexroth specifies a viscosity range of 2.8 to 500 mm²/s, fluid temperature of -20 to +80 °C with NBR seals, ambient temperature of -20 to +70 °C, and a maximum contamination level of class 20/18/15 to ISO 4406 (c). The concealed manual override can only be operated up to 50 bar tank pressure. Horizontal installation is recommended, and the maximum surface temperature of the solenoids is given as 140 °C.
Key Features
The Rexroth R901278781 provides the following features for hydraulic systems:
- A 4-way, 3-position spool with symbol F offers two working directions and a spring-centred neutral position.
- Operating pressure up to 350 bar on ports A, B and P suits high-pressure industrial power units.
- The ISO 4401-05-04-0-05 porting pattern fits standard size 10 subplates and manifold blocks.
- High-power 24 VDC wet-pin solenoids with detachable coils simplify electrical maintenance.
- K4 connectors to DIN EN 175301-803 give IP65 protection with a matching mating connector.
- A concealed manual override allows the spool to be shifted for commissioning and fault finding.
- NBR seals suit mineral oils HL, HLP, HLPD, HVLP and HVLPD, and Rexroth also lists HFC fluid for this seal type.
- Rexroth quotes MTTFd values of 300 to 2400 years for DC versions according to EN ISO 13849.
Industrial Applications
Size 10 solenoid directional valves are workhorses in hydraulic power units and machines. The Rexroth R901278781 is typically used to control double-acting cylinders and hydraulic motors on presses, injection moulding machines, steel mill auxiliaries, test rigs, lifting equipment, valve actuator power units, marine deck machinery and mobile workshop units, wherever a PLC needs to switch flow direction with a 24 VDC signal. Its subplate design means the valve can be swapped quickly without disturbing pipework.
In Oman, hydraulic systems in cement and steel plants in Sohar, port and marine equipment in Duqm and Salalah, and drilling and workover rigs serviced from Muscat all rely on proven valves like this one. Seven Star LLC supplies the Rexroth R901278781 together with related Bosch Rexroth components such as the Bosch Rexroth MHDBD10K2-1X/315V pressure relief valve, the Bosch Rexroth A10VSO axial piston variable pump and the Bosch Rexroth R928006678 hydraulic filter element that keeps fluid within the required cleanliness class.
Installation and Replacement Notes
Before replacing a valve, compare the full type code on the nameplate with 4WE10F5X/EG24N9K4/M, because similar valves differ only in spool symbol, voltage, override or seal letters. Check the subplate seal faces and use the correct mounting screws and tightening torque from RE 23340. Rexroth recommends an interference protection circuit on the system side, for example a connector with integrated suppression, because solenoids create voltage peaks at switch-off; for 24 V coils the recommended protection circuit level is 48 V, and the maximum admissible switch-off overvoltage is 500 V. Effective filtration to class 20/18/15 or better extends spool life.
Technical Specifications
The table below summarises Rexroth R901278781 data from the Rexroth product page and data sheet RE 23340:
| Parameter | Specification |
|---|---|
| Model | Bosch Rexroth R901278781, type 4WE10F5X/EG24N9K4/M |
| Valve type | Directional spool valve, direct operated, solenoid actuation; size 10, series 5X |
| Spool symbol / positions | Symbol F; 4 ports, 3 switching positions |
| Porting pattern | ISO 4401-05-04-0-05, subplate mounting |
| Maximum operating pressure | 350 bar (A, B, P); 210 bar (T, DC) |
| Maximum flow | 90 l/min (this configuration, per Rexroth product data) |
| Solenoids | High-power wet-pin, detachable coil; 24 V DC, 1.61 A, 40 W, S1 |
| Electrical connection | K4, 3-pole (2 + PE) connector to DIN EN 175301-803, IP65 |
| Manual override | N9 concealed (standard), usable up to 50 bar tank pressure |
| Seals and fluids | NBR; HL, HLP, HLPD, HVLP, HVLPD, HFC |
| Fluid / ambient temperature | -20 to +80 °C / -20 to +70 °C |
| Viscosity range | 2.8 to 500 mm²/s |
| Cleanliness | Class 20/18/15 to ISO 4406 (c) |
| Weight | Approx. 5.5 kg |
How to Order
To order the Rexroth R901278781, send Seven Star LLC the quantity and a photo of the existing nameplate or the full type code, and our team in Muscat will prepare a formal quotation. Rexroth data sheet RE 23340 can be downloaded from this page, and we provide engineering support in Muscat for the Rexroth R901278781, spare coils and related hydraulic components for customers across Oman and the GCC.
- Datasheet Bosch Rexroth RE 23340 Directional Spool Valves Type WE Size 10 Data Sheet Download
Bosch Rexroth hydraulic components listed here
Four items are listed. The A10VSO is an axial piston variable displacement pump of swashplate design for open circuits. The DB10G2-5X/50 is a pilot-operated pressure relief valve, and the MHDBD10K2-1X/315V is a direct-operated relief valve in cartridge form. R928006678 is a hydraulic filter element. Older parts may be marked Mannesmann Rexroth; the type codes are read the same way.Ordering Rexroth parts: what we need
The safest reference is the ten-digit material number beginning with R9, printed on the nameplate beside the type code. Send both, with a nameplate photo. For an A10VSO pump, the full code matters: size, controller type, series, direction of rotation, seals, shaft and port plate. For relief valves, give size, pressure stage and seal material. For filter elements, the material number or the complete element code is enough. We supply to buyers across the GCC.Browse Bosch Rexroth products by category: Safety Relief Valves, Filtration Elements, Pumps.
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