I. Model Breakdown Explanation (D633-302B)

D633: D633 Series Direct Acting Servo Valve (DDV), NG6 (03) Installation Surface, MuGe China

302:

3: Flow Code → 10 L/min (Δp=35 bar) Moog Inc.

0: Electronic / Frequency Response → Standard Frequency Response (60–90 Hz), Analog Input, Position Closed Loop, MuGe China

2: Y Port / Seal → No Y Port (Backflow), NBR (Nitrile Butadiene Rubber) Seal, -20 to +80°C Moog Inc.

B: Standard Type, No Special Coating, Standard Voltage Version

One Sentence: D633-302B = NG6 + 10 L/min@35bar + 350bar High Pressure + Direct Acting Without Pilot + 60–90Hz Standard Frequency Response + No Y Port (Backflow) + NBR Seal

II. Core Parameters (Δp=35 bar)

Rated Flow: 10 L/min Moog Inc.

Maximum Pressure: 350 bar (P/A/B); T Port (No Y): 50 bar Moog Inc.

Hysteresis: <0.2% MuGe China

Resolution: <0.1% MuGe China

Frequency Response (±100%): 60–90 Hz MuGe China

Step Response: ≈15 ms Moog Inc.

Zero Position Leakage: ≈0.1 L/min (210 bar) MuGe China

Seal / Temperature: NBR (-20 to +80°C)

Drive: 24VDC, ±10V or 4–20mA Moog Inc.

Filter: ISO 4406 15/12

Features: No Pilot Hole, Extremely Anti-Pollution, Independent of Dynamic and Pressure, Spring Retention After Power Off, Internal Leakage Design (T Port Low Pressure)

III. Comparison of D633-302B with Common Models (Key Differences) Table

Project D633-302B (10L standard / without Y) D633-231A (40L standard / with Y) D633-255A (40L high-frequency / with Y/FKM)

Flow rate 10 L/min 40 L/min 40 L/min

Frequency response 60–90 Hz (standard) 60–90 Hz (standard) 100–120 Hz (high frequency)

Y port No Y port (T≤50bar) With Y port (T≤350bar) With Y port (T≤350bar)

Sealing material NBR (−20～+80℃) NBR (−20～+80℃) FKM (−20～+120℃)

Positioning Low flow, standard dynamic, low-pressure return oil High flow, standard dynamic, high-pressure return oil High flow, high frequency, high temperature, high-pressure return oil

Sentence: 302B is the entry-level model of the D633 series for low-flow applications, suitable for low-pressure return oil, normal temperature, and standard dynamic systems with medium to low power.