D651-235F-5
Description
Model Code Decoding
D651: Base series, ISO 4401 Form A10 (CETOP 5) mounting, two-stage pQ valve with internal pilot supply
235:
2: 4-way main spool with optimized flow characteristics, external pilot supply design
3: Maximum working pressure 350 bar for main ports, FPM seal configuration
5: Standard analog signal interface, multiple signal types selectable
F: Special enhanced version with improved dynamic response and reinforced EMC performance
5: Version code, optimized firmware and internal component matching for stable long-term operation
Technical Specifications
Part Number: D651-235F-5
Valve Size: ISO 4401 Form A10 (CETOP 5), port diameter 10.5 mm
Control Function: 4-way pQ control, flow control with superimposed pressure limiting, switchable independent pressure control mode
Rated Flow (Δp=10 bar): 35 L/min (±10%)
Max Operating Pressure:
P/A/B ports: 350 bar
T port: 210 bar standard, 350 bar available as option
Pilot stage: 15–210 bar
Response Time: 7–11 ms (0→100% step signal, 210 bar)
Hysteresis: <0.7% for flow control, <0.2% for pressure control
Linearity: <0.7% for flow control, <0.35% for pressure control
Electrical:
Supply: 24 VDC (18–32 VDC), maximum current 2.0 A
Command signal: 0–10 V, 0–10 mA, 4–20 mA, fully selectable
Feedback signal: Spool position 0–10 V, system pressure 0–10 V
Protection Class: IP65 when connector is fully mated
Fluid: Mineral oil compliant with DIN 51524, kinematic viscosity 5–400 mm²/s, recommended range 15–45 mm²/s
Temperature:
Ambient: −20°C to +60°C
Fluid: −20°C to +90°C
Mass: Approximately 6.7 kg
Seals: FPM as standard, NBR and EPDM available for selection
Interface & Communication Configuration
Electrical Interface: Analog signal ports for flow and pressure, matched with 24 VDC power supply, no fieldbus in standard configuration
Feedback: Integrated LVDT for spool position detection and built-in pressure sensor to support high-precision closed-loop pQ regulation
Mounting: Standard 4-hole ISO 4401 Form A10 installation pattern, M6 bolts with tightening torque 12–14 Nm
Porting: Equipped with P, A, B, T main ports and X external pilot port, Y drain port optional for high backpressure conditions
Core Functions
Integrates flow control and pressure regulation into one unit, effectively simplifying overall hydraulic circuit layout.
350 bar pressure resistance and FPM seals adapt to high-pressure and medium high-temperature working environments.
External pilot structure together with two-stage nozzle-flapper design delivers quick response and high control resolution.
Upgraded electronic components and EMC reinforcement ensure stable operation under complex electromagnetic interference.
Flexible signal selection and dual closed-loop feedback system guarantee excellent control accuracy.
Multiple working modes can be switched freely to meet diversified flow and pressure control demands.
Application Scenarios
Applied to high-speed hydraulic presses and metal forming equipment requiring composite flow and pressure control.
Suitable for precision injection molding machines to realize accurate speed adjustment and clamping force control.
Deployed on various hydraulic test benches for flow and pressure curve simulation and durability testing.
Used in die-casting and heavy material handling equipment with high dynamic and load requirements.
Ideal for industrial hydraulic systems that need high stability, fast response and strong anti-interference ability.
Compatibility & Differences
Basic configuration: 4-way analog pQ valve, 35 L/min, 350 bar, external pilot, FPM seals, enhanced F version with version 5 firmware.
Compared with conventional D651 models: This unit adopts external pilot supply, upgraded dynamic performance and EMC capability, with wider applicable temperature range.
Interchangeability: Shares the same ISO 4401 Form A10 mounting dimension with other D651 series valves. Check pilot mode, electrical parameters and seal type before on-site replacement.
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