VT-DFPE-A-2X/G24K0/1A0V/V VT-DFPE-A-2X/G24K0/2A0F/V-021 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. Distinguished from the non-integrated VT-DFP (requiring external amplification) and the CAN-bus digital VT-DFPC, 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 six core functional components working in concert to complete electro-hydraulic conversion and closed-loop regulation: 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/G24K0/1A0V/V (material no. R900608752) and VT-DFPE-A-2X/G24K0/2A0F/V-021 (material no. R901229920)—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 LVDT 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)

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

• Operating voltage range: 21 V to 35 V

Rated Current

• 0.6 A

• Short-term peak current: 1.25 A

Input Impedance

• 50 kΩ

Control Signal

• Analog signal: 0-10V voltage or 4-20mA current

• 1A0V: 0-10V control signal

• 2A0F: 4-20mA control signal

Electrical Connection

• K0: Standard aviation connector mounting

Protection Class

• IP65

Operating Temperature Range (Ambient)

• -20°C to +60°C

Weight

• Approx. 2.25 kg

Hydraulic Fluid Compatibility

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

• C-configuration models compatible with HFC fire-resistant fluids

Certifications

• CE certified, compliant with EMC requirements

Model Code Breakdown

VT-DFPE-A-2X/G24K0/1A0V/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

• 1A0V: 0-10V control signal

• V: Standard seals (NBR)

VT-DFPE-A-2X/G24K0/2A0F/V-021

• 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

• 2A0F: 4-20mA control signal

• V: Standard seals (NBR)

• -021: Specific configuration variant

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 LVDT Displacement Sensor — Closed-Loop Precision Control
The VT-DFPE incorporates a built-in LVDT linear displacement feedback 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. Wet-Type Proportional Solenoid — Long Service Life and Low Thermal Drift
The VT-DFPE employs a wet-type proportional solenoid with the coil fully immersed in hydraulic fluid, enabling oil-based heat dissipation that effectively extends coil service life while attenuating control fluctuations from electromagnetic vibration. Combined with ultra-precision lapping of the spool and precisely controlled spool-to-sleeve clearance, internal leakage is significantly reduced and fluid force interference with spool positioning is minimized.

4. Compact Modular Design — Optimized for Variable Pump PQ Compound Control
The VT-DFPE series is specifically designed for variable pump pressure and flow compound control, commonly referred to in the industry as the “PQ pilot valve for pumps”. The valve body undergoes wear-resistant and anti-corrosion finishing, accommodating industrial standard 315-350 bar system operating pressures. The 2X component series ensures uniform mounting flange and port dimensions across the series, facilitating equipment retrofits and replacements.

5. Flexible Input Signal Adaptation and Field Adjustability
The VT-DFPE supports both 0-10V voltage and 4-20mA current industrial analog control signal inputs. The integrated electronic module features built-in signal filtering circuitry that effectively attenuates electromagnetic interference from workshop variable frequency drives and motors. The module supports field adjustment of zero point and gain parameters, accommodating different variable pump control curves and adapting to various equipment speed and pressure regulation requirements.

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:

• Control signal type (1A0V=0-10V, 2A0F=4-20mA): Must match controller output

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

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

2. 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 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

• Control signal type (0-10V or 4-20mA) matches controller output

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

4. Pilot Pressure — No External Pilot Required
The VT-DFPE is a direct-operated pilot valve with the spool directly actuated by the proportional solenoid—no external pilot oil supply is required. This feature simplifies hydraulic circuit design and eliminates a potential failure point.

5. Fault Diagnosis and LED Indication
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 (different control signals) to be interchanged on the same mounting interface for rapid field fault response.