R901451941 2WFC25 Flow Control Valve: Flow & RFQ

R901451941 corresponds to the Bosch Rexroth 2WFC25S220L-1X/M/K4, a pilot-operated proportional directional cartridge valve designed for controlled hydraulic flow. Its rated flow is 220 L/min at a 5 bar pressure differential, with a linear flow characteristic.

For buyers sourcing this model, three details deserve particular attention: the rated flow, the need for a separate pressure compensator, and the external control electronics. These specifications determine whether the valve matches the existing hydraulic circuit and whether the proposed replacement is technically suitable.

What Does the R901451941 2WFC25 Model Code Identify?

The full designation is 2WFC25S220L-1X/M/K4.

Bosch Rexroth classifies the 2WFC family as pilot-operated proportional directional cartridge valves. The valve uses a pilot control stage and a main stage to regulate the opening of the hydraulic flow path according to the electrical command.

The R901451941 configuration has the following characteristics:

• 2WFC: Two-main-port pilot-operated proportional directional cartridge valve.

• 25: Nominal size 25.

• S: Seat control spool.

• 220: Linear spool version with a rated flow of 220 L/min.

• L: Linear flow characteristic.

• 1X: Component series 10–19.

• M: NBR sealing material.

• K4: Three-pole electrical connector, according to DIN EN 175301-803.

One important distinction is the absence of the letter E. The 2WFC version uses external control electronics, while the 2WFCE version incorporates onboard electronics (OBE).

This means the external amplifier and electrical interface must be considered when replacing or integrating R901451941. The connector designation alone does not establish compatibility with the machine controller.

What Is the 2WFC25 Flow Range?

The rated flow of R901451941 is 220 L/min at a 5 bar pressure differential. This is a catalogue specification and does not represent a fixed, constant flow rate across all operating conditions.

Bosch Rexroth document RE 29403 defines two flow characteristic variants for size 25 cartridge valves:

R901451941 uses the 220 L/min linear configuration.

The 330 L/min version is a different configuration, not simply an alternative flow setting for the same material number. Its flow characteristic and control response should be evaluated separately.

Why Does Pressure Differential Matter?

The actual flow through the proportional valve depends on the pressure differential across the valve section.

Bosch Rexroth provides a correction relationship for flow under different pressure differentials:

q = q_nom × √(Δp ÷ 5)

Where:

• q = calculated flow under the relevant pressure differential

• q_nom = rated flow at 5 bar

• Δp = actual pressure differential in bar

For example, the nominal 220 L/min rating should not automatically be used when the actual pressure differential differs from 5 bar.

The manufacturer also provides characteristic curves for the 220 version under different pressure differentials.

Is R901451941 Pressure Compensated?

No. R901451941 is not a standalone pressure-compensated flow regulator.

This distinction is important when selecting a valve for applications where actuator speed must remain relatively stable despite changing loads.

The 2WFC valve proportionally adjusts its main-stage opening according to the electrical command and spool-position feedback. It regulates the available flow area, but this function alone does not eliminate the influence of pressure differential.

Bosch Rexroth specifically explains that the 2WFC proportional directional cartridge valve can provide pressure-compensated flow control when combined with a pressure compensator.

Installation and Control Requirements Before Replacement

R901451941 uses a cartridge installation arrangement. Its mounting interface should therefore be checked against the existing manifold rather than treated as a conventional inline valve connection.

Bosch Rexroth RE 29403 specifies installation dimensions according to DIN ISO 7368.

For nominal size 25, the specified installation bore designation is ISO 7368-BB-08-2-A.

The manufacturer's mounting information also specifies:

• Four M12 × 40 hexagon socket head cap screws.

• Strength class 10.9.

• Tightening torque of 105 ±15 Nm.

These values should be checked against the applicable manufacturer documentation and installation conditions before assembly.

Electrical Control and Seal Compatibility

Since R901451941 is a 2WFC configuration with external control electronics, the amplifier is an important part of the replacement review.

The Bosch Rexroth documentation lists VT-MRPA1-2X external amplifier versions with 0–10 V and 4–20 mA command-value options.

The correct configuration must be checked against the installed control system. Do not assume that the valve includes an integrated 24 V electronics package.

The M suffix identifies NBR seals. Confirm compatibility with the hydraulic fluid, particularly when the machine uses biodegradable or fire-resistant fluids.

Fluid cleanliness also matters. Bosch Rexroth specifies cleanliness class 18/16/13 according to ISO 4406 for this valve family.

R901451941 Supplier, Price and RFQ Requirements

The price of R901451941 should be confirmed through a current supplier quotation rather than estimated from the nominal size or flow rating.

Several factors can affect the quotation:

• Current product availability.

• Original material number and complete configuration.

• Required quantity.

• Delivery destination and shipping method.

• Whether external control electronics are also required.

• Additional connectors or accessories.

• Required documentation and packaging.

A quotation should also distinguish between the valve itself and any separately supplied amplifier or accessories.

For purchasing teams, the following information helps reduce unnecessary quotation revisions.

If the original valve is being replaced, include photographs of the nameplate, electrical connector and installation area.

A hydraulic schematic is particularly useful when the circuit includes a separate pressure compensator. It helps the supplier distinguish between the valve's proportional control function and the complete flow-control arrangement.

Nabor's Bosch Rexroth Valve product category provides a starting point for reviewing related products. Buyers can also use the Rexroth Hydraulic Valve Sizing Guide to organize flow, pressure and mounting information before submitting an inquiry.

For a quotation, provide the complete material number and operating details through Nabor's contact page.

A technically complete inquiry makes it easier to compare the proposed model, accessories and delivery terms without confusing a proportional cartridge valve with a standalone pressure-compensated regulator.

FAQ

What is the rated flow of Bosch Rexroth R901451941?

R901451941 has a rated flow of 220 L/min at a pressure differential of 5 bar. It uses the linear flow characteristic of the 2WFC25S220L configuration.

Does the 2WFC25 have built-in pressure compensation?

No. The 2WFC proportional directional cartridge valve can be used for pressure-compensated flow control when combined with a suitable pressure compensator.

Does R901451941 include integrated electronics?

No. The 2WFC designation identifies the version with external control electronics. The 2WFCE designation is used for versions with integrated electronics.

What is the maximum operating pressure of R901451941?

The Bosch Rexroth RE 29403 technical data specifies a maximum operating pressure of 420 bar at ports A and B. Actual operating conditions must remain within the applicable specifications.

What does K4 mean in 2WFC25S220L-1X/M/K4?

K4 identifies a three-pole electrical connector (2 + PE) according to DIN EN 175301-803. It does not identify the external amplifier's command-value interface.

What information is needed to request an R901451941 quotation?

Provide the material number, complete model designation, quantity, flow requirement, operating pressure, pressure differential, hydraulic fluid, mounting information and external amplifier details.

Reference Sources

1. Bosch Rexroth RE 29403 – 2WFC and 2WFCE Technical Data Sheet
   Official technical documentation covering rated flow, pressure limits, ordering codes, hydraulic connections, mounting dimensions and pressure compensation requirements.

2. Bosch Rexroth 2WFC Product Configuration
   Manufacturer product selector for the 2WFC and 2WFCE proportional directional cartridge valve family.

3. Nabor – Rexroth Flow Control Valve Selection by Circuit Requirement
   Internal technical reference covering flow regulation, pressure compensation and hydraulic circuit selection.

4. Nabor – Rexroth Hydraulic Valve Sizing Guide
   Supporting information on valve sizing, flow requirements, pressure differential and model selection.

5. Nabor – Bosch Rexroth Valve Products
   Relevant product category for Bosch Rexroth hydraulic valve inquiries.