Moog D633-618 Proportional Valve

Moog D633-618 Proportional Valve

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Product details

Moog D633-618 Direct-Drive Proportional Servo Valve (DDV Series)

1. Product Overview

Model D633-618 falls under MOOG D633 series, an ISO size 03 direct-drive closed-loop proportional servo valve. Adopting permanent-magnet linear force motor direct spool drive without pilot oil supply, it comes with integrated onboard drive electronics and built-in LVDT full closed-loop spool position feedback. Controlled via analog signals (±10 VDC or 4–20 mA), this 3-position 4-way valve features O-type center spool function for high-precision closed-loop flow regulation in industrial applications.

- Suffix 618: Denotes flow rating: 40 L/min nominal flow at 70 bar pressure drop across single metering edge

- Mounting standard: ISO4401-03-03-0-94 (size 03), subplate mounting

2. Core Hydraulic Specifications for D633-618

Pressure Ratings

- Main ports P/A/B: Max rated working pressure 350 bar (5000 PSI)

- Tank port T: ≤50 bar without external drain Y port; up to 350 bar with separate external drain Y port

Flow Performance

- Nominal flow: 40 L/min at ΔP = 7 MPa single orifice pressure drop, flow calculation: Q=Q_{rated}×\sqrt{ΔP/70bar}

- Null leakage: ≤1.2 L/min under standard spool machining tolerance

Dynamic Characteristics

- Full-stroke step response (0–100% spool travel): ≤12 ms; Frequency response: 55~60 Hz

- Hysteresis: ＜0.2%; Resolution: ＜0.1%; Thermal null drift: ＜1.5% over 55 K temperature variation

Spool Configuration

3-position 4-way with O-center; centering springs automatically return spool to neutral upon power loss for load locking.

3. Electrical Parameters

- Power supply: 24 VDC nominal (operating range: 18~32 VDC) with built-in SMD PWM drive amplifier board

- Optional command input: ±10 VDC voltage signal / ±10 mA current signal / standard 4–20 mA industrial signal

- Electrical connector: 6-pin circular plug plus PE protective earth, IP65 ingress protection

- Integral LVDT spool displacement sensor enables real-time closed-loop position correction against supply pressure fluctuation.

4. Construction & Operating Principle

1. Actuation: Bi-directional permanent-magnet linear force motor directly drives spool, eliminating requirement for pilot oil feed and associated pilot circuit leakage.

2. Closed-loop Control: Onboard electronics continuously compare setpoint command with actual spool position measured by LVDT to automatically fine-tune spool position for precise flow control.

3. Main components: Linear force motor, centering springs, precision spool-sleeve assembly, integrated drive PCB, LVDT displacement transducer, null adjustment screw plug.

5. Operating Conditions & Ambient Requirements

- Hydraulic fluid temperature: -20℃ ~ +80℃; Ambient air temperature: -20℃ ~ +60℃

- Vibration resistance: Rated for 30g triaxial vibration

- Required fluid cleanliness: NAS 6 / β6≥75 (6 μm filtration), fine high-pressure filtration is mandatory

- Seals: Standard formulation for mineral oil; optional special sealing compatible with phosphate ester fire-resistant fluid; explosion-proof Ex-certified version available on request.

6. Typical Applications

High-precision closed-loop position/speed/pressure/force hydraulic control systems for die-casting machines, injection molding equipment, hydraulic presses, metallurgical rolling mills, material test benches, woodworking machinery and paper-making plants.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Address: Ningbo, China

Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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