Model Interpretation

D656: Series Code (Second Generation PQ Proportional Valve)

430: Specification Code (Piping Diameter 10.5mm, Rated Flow 40L/min)

D: Valve Body Version (Four-way, ISO 4401-A10)

4: Electrical Connector / Configuration Code Technical Specifications

Part Number: D656-430D-4

Valve Specification: ISO 4401-A10 (CETOP 5), Diameter Ø10.5mm

Control Function: Four-way flow + pressure control, spring alignment

Rated Flow (Δp = 5bar): 40L/min (±10%)

Maximum Working Pressure (P/A/B): 350bar

Pilot Pressure: 15–210bar (internal P or external X for oil supply)

T Port Pressure: 50bar (internal); 350bar (with external Y drain)

Response Time (0→100% Stroke): ≤20ms

Hysteresis: Flow < 0.25%; Pressure < 0.2%

Linearity: < 1.0%

Electrical:

Power Supply: 24VDC (18–32VDC)

Signal: ±10V, 4–20mA

Connection: 6+PE (EN 175201)

Protection Grade: IP65 (lock of connection)

Hydraulic Oil: Mineral Oil (DIN 51524), Viscosity 15–45mm²/s

Temperature:

Environment: −20°C ~ +60°C

Oil: −20°C ~ +80°C

Weight: Approximately 6.8kg

Sealing: Standard NBR; Optional FPM/EPDM

Interface and Communication Configuration

Electrical Interface: Analog Command (+±10V/4–20mA) + 24VDC Power Supply

Feedback: Integrated Valve Core Position Sensor + Pressure Sensor (closed-loop PQ Control)

Installation: 4-hole ISO 4401-A10 Installation (M6 screws, 11Nm)

Oil Ports: P, A, B, T; Optional external Y Drain (T > 50bar) Core function

PQ Composite Control: One valve achieves precise regulation of flow and pressure, replacing multiple valve groups

Integrated Closed-loop Electronics: On-board PID closed-loop control, with high control accuracy and good repeatability

High Dynamic Response: ≤ 20ms step response, suitable for high-speed conditions

Low Hysteresis High Resolution: < 0.25% hysteresis, strong anti-interference ability

Sturdy Pilot Stage: Dual nozzles - baffle design (optional jet pipe), low leakage, long lifespan Application scenario

Industrial machinery: Injection molding machines, die-casting machines, metal forming presses

Machine tools: High-precision hydraulic actuators, clamping systems, synchronous control

Test benches: Pressure/flow simulation, component durability testing

Hydraulic stations: Variable pressure/flow energy-saving control for multi-executor systems

Compatibility description

Series compatibility: Can be interchanged with D651 (D651-E491), D657/D658 series

Replacement and upgrade: Can directly replace traditional proportional valves + pressure valves combination, simplifying the system

System requirements: 24VDC power supply, analog controller, ISO 4401-A10 standard valve block