Model Explanation

D661: Series code (Integrated electronics, 24VDC, ISO 4401-05 installation)

4627A: Valve core / valve body combination and pilot stage type (ServoJet® jet pipe)

G75: Rated flow rate 75 L/min (ΔP = 35 bar)

H: Maximum working pressure 350 bar (5000 psi)

O: Four-way, critical overlap, linear characteristics

A: ServoJet® jet pipe pilot stage

06: Pilot oil port connection method

V: Fluorine rubber seal (Temperature resistant / Oil resistant)

S: Electrical connector 6+PE (EN175201)

P2: Valve core position feedback 4–20mA Moog Inc.

HA: Standard performance, special option combination Moog Inc. Technical Specifications

Hydraulic parameters

Rated flow rate: 75 L/min (ΔP = 35 bar)

Maximum working pressure: 350 bar (P/A/B ports); return oil T port 210 bar (Moog Inc.)

Installation standard: ISO 4401-05 (NG10)

Step response: 6.5–14 ms (0→100%, 210 bar)

Hysteresis: <0.2%; Resolution: <0.1%

Electrical parameters

Power supply: 24 VDC (18–32 VDC) Moog Inc.

Control signal: ±10 V or ±10 mA Moog Inc.

Feedback signal: 4–20 mA (valve core position)

Connection: 6+PE, protection IP65 Moog Inc.

Environment and physics

Working temperature: -40℃ ~ +85℃

Weight: Approximately 5.5 kg

Material: Valve body alloy steel, valve core hard alloy

Interface and communication configuration

Hydraulic interface: P/A/B/T four ports, in accordance with ISO 4401-05

Electrical interface:

Power supply: 24VDC, GND, PE

Command: ±10V or ±10mA

Feedback: 4–20mA (valve core position)

Status: Valve ready, fault alarm Core function

ServoJet® Jet Pipe Preamplifier: Strong anti-contamination performance, low drift, long lifespan

Integrated closed-loop amplifier: Built-in PID, hysteresis compensation, overload protection

Valve core position electrical feedback: High precision and high linearity throughout the full stroke

High dynamic response: Millisecond-level response, suitable for high-speed closed-loop control

Low leakage design: Zero leakage <15 mL/min Applicable scenarios

Metallurgy: Rolling mill reduction, tension control, AGC system

Test equipment: Material testing machine, vibration table, fatigue test bench

Industrial automation: Precision machine tools, injection molding machines, robots, hydraulic forming machines

Energy and heavy industry: Wind turbine pitch control, shield tunneling machines, ship rudder systems, aircraft ground testing

Use and maintenance

Installation: Horizontal or vertical installation, avoid severe vibration; oil cleanliness NAS 1638-6 grade or better

Commissioning: Power supply 24VDC, connect ±10V/±10mA instructions; observe 4–20mA position feedback, zero adjustment and gain adjustment

Maintenance: Regularly check oil contamination degree; calibrate zero point and gain every 6 months; avoid long-term high-pressure standby without instructions