VT-DFPE-A-22 Rexroth Proportional Valve NG6 400 bar

Product Overview

The VT-DFPE-A-22/G24K0/0A1V/V-014 (Material No. R900720216) is a direct-operated proportional directional valve from Bosch Rexroth’s VT-DFP series, designed as a pilot control valve for SY(H)DFE electro-hydraulic control systems. It belongs to the product line featuring electrical position feedback and integrated analog on-board electronics (OBE).

Built on the 2X component series, the valve integrates the analog control amplifier directly onto the valve body, eliminating the external amplifier card VT 5041-3X required in conventional configurations and substantially simplifying control cabinet wiring and system integration. As a pilot control valve, the VT-DFPE does not directly drive main circuit actuators; instead, it outputs controlled pilot pressure oil to actuate the displacement control cylinder of SY(H)DFEE variable pumps, enabling precise regulation of pump output flow and pressure.

The valve mounts via subplate according to ISO 4401-03-02-0-05 at nominal size NG6 (Cetop 3), with maximum operating pressure of 400 bar at ports A and P and 100 bar at port T. Model code breakdown: “A” denotes standard spool groove configuration, “0A1V” indicates differential ±10 V voltage input signal, and “V” specifies FKM seal material.

As a drop-in replacement, the valve is fully compatible with the OEM Rexroth specification in mounting interface, electrical connection, and performance characteristics. Every unit undergoes 100% simulation-based testing prior to shipment, covering null stability, flow linearity, step response, and internal leakage.

Technical Specifications

All parameters below are based on Bosch Rexroth official datasheet RE 29016 (Edition 2019-09) and verified supplier technical pages:

• Complete Model: VT-DFPE-A-22/G24K0/0A1V/V-014

• Material Number (MNR): R900720216

• Brand: Bosch Rexroth

• Product Series: VT-DFP series, component series 2X

• Product Type: Direct-operated proportional directional valve with electrical position feedback, pilot control valve for SY(H)DFE control systems

• Control Electronics: VT-DFPE — integrated analog (OBE)

• Spool Variant: A — standard spool groove configuration

• Nominal Size: NG6 (ISO 4401-03-02-0-05 / Cetop 3)

• Mounting: Subplate mounting

• Max Operating Pressure (Ports A, P): 400 bar

• Max Operating Pressure (Port T): 100 bar

• Supply Voltage: DC 24 V (permissible range 21 – 35 V, withstanding short-term voltage fluctuations)

• Rated Current: 0.6 A (static); maximum 1.25 A

• Command Signal: Differential ±10 V voltage input (A1V)

• Input Impedance: ≥ 50 kΩ

• Hydraulic Fluid: Mineral oil (HL, HLP per DIN 51524)

• Fluid Temperature Range: -20 °C to +70 °C

• Viscosity Range: 20 – 380 mm²/s

• Ambient Temperature Range: -20 °C to +60 °C

• Seal Material: FKM (Viton)

• Protection Class: IP65

• Cleanliness Requirement: ISO 4406 18/16/13

• Electrical Connection: 12-pin central connector (per EN 175201-804)

• Weight: 2.25 kg

Note: Specifications are based on Bosch Rexroth official datasheet RE 29016 (Edition 2019-09) and verified supplier technical pages. Model code breakdown: VT-DFPE = pilot proportional valve with integrated analog electronics; A = standard spool groove; 22 = 2X series; G24 = DC 24 V supply; K0 = connector configuration; 0A1V = differential ±10 V voltage input; V = FKM seals. Rated flow, peak pressure, and maximum speed parameters require verification against the specific spool code and system configuration in the official datasheet.

Key Technical Advantages

1. Integrated Analog Electronics (OBE) — No External Amplifier Required

The VT-DFPE series integrates the analog control circuit board directly onto the valve body, eliminating the external amplifier card VT 5041-3X required in conventional configurations. System integrators no longer need a separate external control module per valve. Control cabinet wiring is significantly simplified, and troubleshooting is reduced from a two-node “valve + amplifier” diagnostic path to a single-node check. For standardized SY(H)DFEE variable pump system design and long-term maintenance, this integration directly reduces total cost of ownership.

2. LVDT Closed-Loop Control for High-Precision Pilot Pressure Regulation

The valve employs a proportional solenoid with electrical position feedback (LVDT) in a closed-loop control architecture. Actual spool displacement is continuously measured by an integrated displacement sensor and fed back to the onboard analog electronics for comparison against the command signal and dynamic correction. Compared with open-loop proportional valves without position feedback, the closed-loop architecture maintains spool positioning accuracy independent of fluid temperature variation, pressure fluctuation, and long-term wear, ensuring superior repeatability in SY(H)DFEE variable pump output flow and pressure control.

3. High Pressure Rating with Compact Structure

Maximum operating pressure at ports A and P reaches 400 bar, allowing direct integration into high-pressure hydraulic circuits without additional pressure-reducing stages. With a total weight of only 2.25 kg, the compact structure enables direct mounting on pump housings or manifolds, particularly suited to space-constrained industrial hydraulic applications.

4. FKM Seals and IP65 Protection for Demanding Industrial Environments

FKM (Viton) seal material provides excellent resistance to mineral oil-based hydraulic media. The IP65 protection rating prevents dust ingress and water jet exposure from reaching internal electronics, maintaining reliable operation at relative humidity up to 95%. These environmental design features enable long-term stable operation in harsh industrial environments such as metallurgy and mining.

5. 100% Simulation-Based Testing and Drop-In Interchangeability

Every VT-DFPE-A-22 undergoes 100% simulation-based testing prior to shipment. Test protocols cover null stability, flow linearity, step-response verification, and internal leakage detection. As a drop-in replacement, the valve is fully compatible with the OEM Rexroth specification in mounting dimensions, electrical interface (12-pin central connector), and performance characteristics, enabling direct replacement without hydraulic circuit or control wiring modification.

Application Areas

• SY(H)DFEE Variable Pump Control Systems: Standard pilot control valve for 4WRPE/4WRP series variable pumps, enabling precise pump output flow and pressure regulation

• Injection Molding Machines: Closed-loop control of injection velocity and hold pressure for consistent part quality

• Die Casting Equipment: High-speed dynamic pressure regulation and real-time switching control

• Hydraulic Presses: Precision position/velocity control, force/position hybrid control

• Material Testing Systems: Flow and pressure closed-loop control for electro-hydraulic servo loading systems

• Industrial Automation Lines: Integration with PLC for digital control of variable pumps

• Metallurgy & Mining Equipment: High pressure rating and IP65 protection suitable for harsh industrial environments

Expert Maintenance Tips

Pre-Installation Checks:

• Verify the manifold mounting surface conforms to ISO 4401-03-02-0-05 (NG6) standard; surface roughness Ra ≤ 0.8 μm

• Flush all piping with clean hydraulic fluid prior to installation; ensure system cleanliness reaches ISO 4406 18/16/13 or better

• Inspect FKM seals for damage and confirm compatibility with the hydraulic fluid in use

• Tighten mounting bolts in diagonal sequence to specified torque

Operational Maintenance:

• Use a 5–10 μm precision pressure filter, specified without bypass and equipped with a contamination indicator

• Recommended fluid: mineral oil (HL, HLP per DIN 51524); maintain operating viscosity within 20 – 380 mm²/s

• Maintain fluid temperature within -20 °C to +70 °C; avoid overheating that degrades fluid quality

• Periodically inspect the integrated electronics LED status indicators; confirm 24 V DC supply remains within allowable range

• Monitor null output pressure offset; significant increase indicates spool/sleeve wear or LVDT sensor anomaly

Troubleshooting Guide:

• Spool fails to actuate or responds abnormally: Check 24 V DC supply, verify differential ±10 V command signal reaches the valve correctly, confirm 12-pin connector engagement is reliable

• Null-point drift: After ruling out fluid contamination, verify LVDT sensor feedback signal integrity; check whether the spool is stuck due to contamination

• Insufficient output pressure: Confirm system supply pressure is within the 400 bar allowable range; check spool metering edges for partial blockage by contaminant particles

• Electronics alarm: Consult OBE electronics diagnostic codes; verify supply voltage, command signal, and LVDT feedback signal are within normal ranges