VT-DFPE-A-2X/G24K0/2A1E/V VT-DFPE-A-21/G24K0/2A1E/V Proportional Valve

Product Overview

The VT-DFPE series proportional pilot valves represent Bosch Rexroth’s core offering within the VT-DFP pilot valve portfolio, specifically developed for SY(H)DFEE electronic variable-displacement pump systems. The VT-DFPE features integrated OBE (On-Board Electronics) analog control electronics directly housed within the valve body, combined with a built-in displacement sensor and direct-operated proportional solenoid—eliminating the need for external standalone proportional amplifiers and providing dedicated pressure/flow compound control for variable pumps.

The VT-DFPE series is a direct-operated 3-way proportional directional valve with electrical position feedback, serving as the pilot control valve for SY(H)DFE control systems for pressure and flow control. The valve body employs a modular split construction, with core functional components working in concert: forged alloy valve body, high-precision spool and sleeve, wet-type proportional solenoid, spring centering assembly, LVDT linear displacement feedback sensor, and integrated analog electronic control module.

This product offers a complete range of VT-DFPE series proportional pilot valves—including models VT-DFPE-A-2X/G24K0/2A1E/V (material no. R900724229) and VT-DFPE-A-21/G24K0/2A1E/V—as direct drop-in replacement alternatives for original Rexroth VT-DFPE valves. All products are manufactured to strict OEM specifications and undergo 100% real-world condition simulated testing, ensuring seamless integration with existing systems without any modification required.

Core Value Proposition:

• Direct Interchangeability: Full dimensional, interface, and electrical compatibility with original Rexroth VT-DFPE valves

• 100% Simulated Condition Testing: Complete validation of pressure, flow, and response characteristics under actual operating parameters prior to shipment

• Integrated OBE Analog Electronics: On-board analog control electronics eliminate the need for external standalone amplifiers

• Direct-Operated with Electrical Position Feedback: Built-in displacement sensor enables closed-loop precision control

Technical Specifications 

Valve Type

• Direct-operated 3-way proportional directional valve with electrical position feedback, serving as pilot valve for SY(H)DFE control systems

Product Series

• VT-DFPE: Pilot proportional valve with integrated analog electronics

Component Series

• 2X (Series 20 to 29)

• 21 (Series 21)

Spool Configuration

• A: Standard spool configuration

Mounting

• Subplate mounting

Maximum Operating Pressure

• 350 bar (5,076 psi)

• Note: Select models allow 400 bar on ports P and A, 100 bar on port T

Supply Voltage

• 24 VDC (nominal)

• Operating voltage range: 21 V to 35 V (short-time)

Rated Current

• 0.6 A (static)

• Short-term peak current: 1.25 A

Analog Current Input Load

• 100 Ω

Analog Voltage Input Load

• ≥ 50 kΩ

Analog Output Current

• Max 1.5 mA

Digital Output Current

• Max 10 mA

Command Signal

• 2A1E: Current input type (4-20 mA) with monitoring

Electrical Connection

• K0: Standard aviation connector

Protection Class

• IP65

Operating Temperature Range (Ambient)

• -20°C to +60°C

Storage Temperature

• Max 70°C

Weight

• Approx. 2.25 kg

Mounting Specifications

• 4x M6 mounting screws

• Screw length: 40 mm

• Tightening torque: 7 Nm

Hydraulic Fluid Compatibility

• Mineral-based hydraulic oils (HL, HLP, etc.)

Certifications

• CE certified, compliant with EMC requirements

Model Code Breakdown

VT-DFPE-A-2X/G24K0/2A1E/V

• VT-DFPE: Pilot proportional valve with integrated analog electronics

• A: Standard spool configuration

• 2X: Component series 20-29

• G24: 24V DC supply

• K0: Standard aviation connector

• 2A1E: Current input 4-20 mA

• V: Standard seals (NBR)

VT-DFPE-A-21/G24K0/2A1E/V

• VT-DFPE: Pilot proportional valve with integrated analog electronics

• A: Standard spool configuration

• 21: Component series 21

• G24: 24V DC supply

• K0: Standard aviation connector

• 2A1E: Current input 4-20 mA

• V: Standard seals (NBR)

Key Technical Advantages

1. Integrated OBE Analog Electronics — No External Amplifier Required, Plug-and-Play
The VT-DFPE features OBE analog control electronics integrated directly into the valve body, incorporating signal acquisition, PID computation, power drive, and fault signal output functions. Only standard 24V DC power supply and analog command signal interfaces are required externally, significantly simplifying electrical wiring and suiting compact industrial control cabinet installations. Compared to the VT-DFP which requires external VT 5041 series amplifiers, the VT-DFPE substantially reduces system complexity and space requirements.

2. Built-in Displacement Sensor — Closed-Loop Precision Control
The VT-DFPE incorporates a built-in displacement sensor that continuously detects actual spool position and feeds back to the integrated electronic control unit. The control unit dynamically adjusts drive current based on deviations between target displacement command and feedback value, forming a complete negative feedback closed-loop control system. This design effectively compensates for control deviations caused by load variations, oil temperature fluctuations, fluid forces, and friction resistance, achieving precise linear correspondence between input electrical signals and pump output flow and system pressure.

3. Wide Voltage Tolerance and Comprehensive Protection Features
The VT-DFPE supports a wide 21-35V input voltage range (nominal 24V), effectively accommodating voltage fluctuations in industrial power systems. Every digital output is equipped with short-circuit protection, ensuring wiring faults do not damage the electronics. Analog and digital output ports provide status monitoring signals for supervisory hardware or PLCs to read real-time valve operating conditions.

4. Direct-Operated Design — No External Pilot Required, Fast Response
The VT-DFPE employs a direct-operated configuration where the spool is directly actuated by the proportional solenoid, eliminating the need for external pilot oil supply. Compared to pilot-operated proportional valves, the direct-operated design eliminates pressure fluctuations and response delays from the pilot circuit, delivering a more streamlined system architecture and higher reliability—particularly critical for variable pump pressure/flow compound control applications requiring rapid response.

5. Stringent Fluid Cleanliness Requirements and Long Service Life
Rexroth explicitly states that the VT-DFPE series pilot valve is a “dirt-sensitive component”. The valve features精密 spool/sleeve fit with recommended system fluid cleanliness of ISO 4406 (c) 18/16/13 or higher. The wet-type proportional solenoid coil is fully immersed in hydraulic fluid, enabling oil-based heat dissipation that effectively extends coil service life.

6. IP65 Protection and Harsh Environment Adaptability
The VT-DFPE features IP65 protection, effectively resisting dust ingress and low-pressure water jets. The ambient operating temperature range spans -20°C to +60°C, with storage temperature up to 70°C, ensuring reliable electrical performance and mechanical actuation under harsh industrial conditions.

Application Areas

• Variable Pump Pressure/Flow Compound Control Systems (SY(H)DFEE) : The VT-DFPE serves as the pilot valve for precise control of variable pump displacement and pressure

• Injection Molding Machine Hydraulic Systems: Pressure and flow proportional pilot control for variable pumps

• Presses and Forging Equipment: Pressure/flow compound regulation for variable pump systems

• Metallurgical Equipment: Variable pump pilot control for rolling mill hydraulic systems

• Marine and Offshore Engineering: Pressure/flow pilot regulation for hydraulic power units

• Industrial Hydraulic Test Benches: Pilot control for variable pump performance testing systems

Expert Maintenance Tips

1. Model Confirmation and Code Interpretation
Prior to installation, carefully verify the valve model code to confirm the following key parameters match system requirements:

• Command signal type (2A1E=4-20mA current input): Must match controller output

• Supply voltage (G24=24V DC): Confirm system supply is within 21-35V range

• Component series (2X or 21): Confirm mounting dimensions match

• Seal material (V=standard NBR): Verify for special fluid requirements

2. Strict Fluid Cleanliness Management
The VT-DFPE series pilot valve features精密 spool/sleeve fit and is extremely sensitive to fluid contamination. Rexroth explicitly states that “this pilot valve is a dirt-sensitive component”—during replacement, ensure no contaminants enter the fluid-carrying parts of the valve or pump. Recommended system fluid cleanliness is ISO 4406 (c) 18/16/13 or higher, with full-flow return line filters rated at 10 μm or finer.

3. Electrical Connection Inspection
The VT-DFPE uses a standard aviation connector (K0) for electrical connection. Prior to installation, verify:

• Supply voltage is 24 VDC within 21-35V range

• Command signal is 4-20mA current input

• Connector locking mechanism is fully engaged to prevent loosening due to vibration

4. Mounting Torque Specifications
The VT-DFPE is secured with 4x M6 mounting screws, each requiring a length of 40 mm to reach the internal brass inserts. Recommended tightening torque is 7 Nm to maintain alignment under vibration.

5. LED Status Indicator Diagnostics
The VT-DFPE integrated electronic module features a power LED indicator (Power-LED PWR):

• LED ON: Power supply normal

• LED OFF: No supply voltage
  After installation, confirm the LED indicator status is normal. If system anomalies occur, first check supply voltage and control signal integrity.

6. Contamination Prevention During Replacement
When replacing a VT-DFPE pilot valve, observe the following precautions:

• Thoroughly clean the area around the valve body before removal

• Immediately seal ports with clean plugs after removal to prevent contaminant entry into the hydraulic system

• Verify O-ring seals are intact before installing the new valve

• Prevent foreign objects from falling onto the valve mounting surface during installation

7. Spare Parts Strategy
It is recommended to keep 1-2 identical pilot valves as on-hand spares. The VT-DFPE series 2X component series maintains uniform mounting flange and port dimensions, allowing different configuration variants to be interchanged on the same mounting interface for rapid field fault response.