Product Overview
The D41FHB31C1NE00 and D41FHB31E1NB00 are pilot-operated proportional directional control valves from Parker Hannifin’s D*1FB OBE series. These valves feature a two-stage pilot/main stage control architecture, with the main spool position barometrically fed back to the pressure reducing pilot valve. The pilot control pressure of 25 bar enables high flow rates at maximum stability.
Rated at NG16 (CETOP 07) with ISO 4401 / DIN 24340 / CETOP RP121 mounting interface, the valve integrates onboard electronics (OBE) housed in a robust metal enclosure, suitable for use under rough environmental conditions. The series features progressive flow characteristics for sensitive flow rate adjustment.
The D41FHB31C1NE00 and D41FHB31E1NB00 are the same model with different configuration variants—the suffix differences (“C1NE00” vs “E1NB00”) typically indicate specific seal material, electrical connection, or factory-preset parameter combinations, while mounting dimensions and fundamental performance remain fully identical.
As a direct OEM-replacement solution, this valve maintains 100% mechanical and functional interchangeability with the original Parker unit. Every valve undergoes rigorous simulation testing—including pressure cycling, thermal variation, and full-stroke endurance validation—to guarantee factory-grade performance. Ideal for industrial hydraulic systems demanding high flow control accuracy and stability.
Technical Specifications
D41FHB31C1NE00 / D41FHB31E1NB00:
Model: D41FHB31C1NE00 / D41FHB31E1NB00
Brand: Parker Hannifin
Valve Type: Pilot-operated proportional directional control valve
Series: D41FB OBE (with onboard electronics)
Nominal Size: NG16 (CETOP 07 / NFPA D07)
Mounting Interface: DIN 24340 / ISO 4401 / CETOP RP121 / NFPA
Mounting Type: Subplate mounting
Pilot Control Pressure: 25 bar
Max. Operating Pressure: 350 bar (ports P, A, B, X)
Max. Pressure Ports T/Y: 185 bar (with internal pilot drain)
Nominal Flow: 240 L/min (at Δp = 10 bar per control edge)
Max. Flow: 420 L/min
Spool Feedback: Barometric feedback to pressure reducing pilot valve
Control Type: Proportional solenoid with integrated OBE
Supply Voltage: 18 – 30 VDC
Command Signal: 0 ± 10 VDC (100K ohm) or 0 ± 20 mA (500 ohm)
Electrical Connection: 7-pin CE connector (P/N 5004072)
Seal Material: NBR
Body Material: Cast Iron
Hysteresis: < 0.5%
Repeatability: < 0.5%
Step Response: 45 ms (time to reach 90% of a 100% step command)
Recommended Fluid Cleanliness: ISO 4406 18/16/13
Ambient Temperature Range: -20°C to +60°C
Protection Class: NEMA 4 / IP65 (when plugged and mounted)
Weight: 11.9 kg (with OBE)
Vibration Resistance: 10 Sinus 5…2000 Hz per IEC 68-2-6
Key Technical Advantages
1. Closed-Loop Spool Position Feedback – Superior Repeatability
The D*1FH series features high-performance two-stage pilot-operated proportional valve design with electronic spool position feedback and integrated control electronics. The built-in position transducer continuously monitors actual spool position against the command signal, ensuring highly repeatable spool displacement. Hysteresis < 0.5%, repeatability < 0.5%.
2. Pilot-Operated Two-Stage Design – High Flow Capacity with Maximum Stability
The two-stage control architecture—with main spool position barometrically fed back to the pressure reducing pilot valve—delivers both high flow capacity and fast dynamic response. The pilot control pressure of 25 bar enables high flow rates at maximum stability. The NG16 size offers a nominal flow of 240 L/min (at Δp = 10 bar) and a maximum flow of 420 L/min.
3. Progressive Flow Characteristics and High Frequency Response – Sensitive Flow Adjustment
The D*1FB series features progressive flow characteristics for sensitive flow rate adjustment. Step response time is only 45 ms (time to reach 90% of a 100% step command), ensuring precise control even in rapid cycling applications.
4. Integrated OBE Electronics – Robust Design for Harsh Environments
The valve integrates onboard electronics housed in a robust metal enclosure, ensuring reliable operation under harsh environmental conditions. Nominal values are factory preset. This integrated design significantly simplifies system wiring and reduces potential failure points.
5. Drop-In Interchangeability – Minimized Downtime and Retrofit Costs
The valve strictly adheres to Parker’s original mounting dimensions and functional specifications, with ISO 4401 / DIN 24340 interface compliance. Whether for new system design or legacy system upgrades, this valve offers 100% mechanical and electrical interchangeability with the original Parker unit—eliminating the need for manifold modifications or piping changes, significantly reducing downtime and retrofit expenses.
Application Areas
Injection Molding Machinery – Precision proportional control of injection speed and holding pressure
Hydraulic Presses – Closed-loop control of slide velocity and pressure
Machine Tools – Precision direction and flow control for table feed and positioning
Metallurgical Equipment – High-flow direction and flow control in rolling mill hydraulic systems
Cement Plant Equipment – Integrated flow, pressure, and direction control for grate cooler hydraulic systems
Industrial Automation Lines – High-flow proportional flow and direction regulation for hydraulic actuators
Expert Maintenance Tips
1. Fluid Cleanliness Management
D*1FB series proportional valves require a recommended fluid cleanliness level of ISO 4406 18/16/13. Install filters with a minimum rating of 10μm upstream of the valve and regularly monitor fluid contamination levels to prevent spool sticking or wear.
2. Pilot Pressure Supply
The valve requires a stable pilot control pressure of 25 bar. Ensure adequate pilot oil supply—insufficient pilot pressure may result in incomplete main spool shifting or degraded control accuracy.
3. Electrical Connections and Signal Matching
The valve operates on 18 – 30 VDC supply voltage with optional 0 ± 10 VDC or 0 ± 20 mA command signals. Verify that the control signal type and supply voltage match the system specifications prior to installation. Use shielded cables for control signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.
4. Return Line Backpressure Control
The internal pilot drain ports T and Y have a maximum pressure rating of 185 bar. To ensure proper operation, the return line must remain full of oil. If installation conditions prevent the return line from staying full, install a preload valve in the return line to maintain appropriate backpressure.
5. Installation and Sealing
Ensure the mounting surface is flat and smooth, and tighten mounting bolts evenly to specified torque. Mounting position is unrestricted. Properly install NBR seals without damage or omission.
6. Parameter Configuration and Commissioning
Nominal values are factory preset. If parameter adjustment is required, connect via serial RS232 interface (accessory required) and edit using ProPxD software. During commissioning, test spool actuation with low-voltage signals first, then gradually increase signal amplitude after confirming normal operation.
