1. Product Overview

2. Model Code Decoding (D634‑521P40KA2M0NSM2)

• D634: Series (ISO 4401‑05 / NG10)

• 521: Core model (60 L/min rated flow)

• P40: Proportional version, 40% flow gain

• K: ±10 VDC control signal

• A2: Integrated 24 VDC electronics, standard

• M0: No manifold, standard mounting

• N: No Y‑port (internal drain)

• S: Standard spool

• M2: M18 6‑pin + PE connector

3. Basic Information

• Brand: MOOG

• Model: D634-521P40KA2M0NSM2

• Type: Pilotless electro‑hydraulic direct‑drive proportional valve (DDV)Moog Inc.

• Mounting: ISO 4401‑05 (NG10)

• Drive: Permanent magnet linear force motor (no pilot oil)

• Power Supply: 24 VDC (18–32 VDC), max 2.2 A

• Feedback: Integrated LVDT spool position closed‑loop

• Reset: Spring‑centered; fail‑safe neutral on power loss

• Protection: IP65

• Weight: ~6.3 kg

• Connector: M18 6‑pin + PE

4. Core Performance Parameters

Hydraulic Parameters

• Max working pressure (P/A/B): 350 bar

• Max T‑port pressure: ≤50 bar (internal drain, no Y‑port)

• Rated flow (Δp=35 bar): 60 L/min

• Peak flow: ~110 L/min

• Null leakage: 0.25–1.8 L/min

• Fluid: ISO 11158 mineral oil

• Fluid temp: –20 °C to 80 °C

• Cleanliness: ISO 4406 17/14/11

Dynamic Parameters

• Full‑stroke step response: ≤16 ms

• –3 dB bandwidth: 60–80 Hz

• Hysteresis: <0.15% full scale

• Resolution: <0.06% full scale

• Temp drift: <1.0% full scale

Electrical Parameters

• Control signal: ±10 VDC (K option)

• Spool feedback: 0–10 VDC

• Ambient temp: –20 °C to 60 °C

• Certification: CE compliant

5. Key Features

• Direct‑drive, no pilot oil: Higher reliability, lower contamination risk

• Integrated closed‑loop control: LVDT feedback ensures high accuracy and repeatability

• 24 VDC PWM electronics: Energy‑efficient, low power consumption at null

• Fail‑safe design: Spring‑centered on power loss for safety

• Robust construction: IP65 protection for harsh industrial environments

6. Application Fields

• Medium‑tonnage hydraulic presses & forging machinesMoog Inc.

• Injection molding & die‑casting equipmentMoog Inc.

• Vibration test benches & material fatigue testingMoog Inc.

• General industrial high‑response hydraulic systemsMoog Inc.

• Automation machinery requiring accurate flow controlMoog Inc.