Model Code Decoding

• D651: Base series with ISO 4401 Form A10 (CETOP 5) mounting structure, belonging to two-stage pQ control valves

• 314:

  • 3: 4-way main spool with optimized flow profile and external pilot supply structure

  • 1: Maximum working pressure 350 bar for main ports, fitted with NBR sealing components

  • 4: Standard analog signal interface supporting 0–10 V and 4–20 mA, with optimized firmware for stable operation

Technical Specifications

• Part Number: D651-314

• 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, and 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 configuration)

  • Pilot stage: 15–210 bar

• Response Time: 8–12 ms (0→100% step signal under 210 bar)

• Hysteresis: <0.8% for flow control, <0.2% for pressure control

• Linearity: <0.8% for flow control, <0.4% for pressure control

• Electrical:

  • Supply: 24 VDC (18–32 VDC), maximum operating current 2.0 A

  • Command signal: 0–10 V, 4–20 mA (selectable)

  • Feedback signal: Spool position 0–10 V, system pressure 0–10 V

  • Protection Class: IP65 when the connector is fully mated

• Fluid: Mineral oil complying with DIN 51524, kinematic viscosity ranges from 5 to 400 mm²/s, recommended working range 15–45 mm²/s

• Temperature:

  • Ambient: −20°C to +60°C

  • Fluid: −20°C to +80°C

• Mass: Approximately 6.5 kg

• Seals: NBR as standard configuration, FPM and EPDM are available as optional alternatives

Interface & Communication Configuration

• Electrical Interface: Analog signal channels for flow and pressure, matched with 24 VDC power supply, no fieldbus function in standard version

• Feedback: Built-in LVDT for spool position detection and integrated pressure sensor to realize closed-loop pQ regulation

• Mounting: Standard 4-hole ISO 4401 Form A10 installation pattern, M6 bolts with tightening torque between 12 Nm and 14 Nm

• Porting: Equipped with P, A, B, T main ports and X external pilot port, Y drain port can be added to adapt to high backpressure conditions

Core Functions

1. It integrates high-precision flow control and pressure regulation into one unit, simplifying hydraulic circuit design and saving installation space.

2. The 350 bar pressure resistance meets the operation requirements of various high-pressure hydraulic systems, and standard NBR seals suit conventional temperature working conditions.

3. Adopting two-stage nozzle-flapper pilot structure, the valve features fast dynamic response and high control resolution.

4. Built-in digital electronics complete closed-loop control, reducing the use of external auxiliary components and simplifying on-site wiring.

5. The external pilot supply structure maintains stable working performance even when the inlet pressure fluctuates.

6. IP65 protection grade enables steady operation in industrial environments with dust and moisture.

Application Scenarios

• Applied to high-speed hydraulic presses and metal forming equipment that require collaborative control of flow and pressure.

• Suitable for precision injection molding machines to realize accurate speed adjustment and clamping force control.

• Deployed on hydraulic test benches for flow and pressure curve simulation and component durability tests.

• Matched with heavy-duty material handling equipment with high load and dynamic working demands.

• Ideal for various industrial hydraulic systems that require compact structure and reliable pQ control performance.

Compatibility & Differences

• Basic configuration: 4-way analog pQ valve, rated flow 35 L/min, maximum pressure 350 bar, external pilot supply and NBR standard seals.

• Compared with other models in the same series: Differences mainly lie in seal materials, pilot supply modes and supporting signal types.

• Interchangeability: It shares the same ISO 4401 Form A10 mounting size with other products of the series. Please check electrical parameters, seal types and pilot modes before replacement.