I. Model Breakdown Explanation (D633-314A)

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

314:

3: Flow Code → 75 L/min (Δp = 35 bar)

1: Electronic / Frequency Response → High Frequency Response (120–150 Hz), Analog Input, Position Closed Loop

4: Y Port / Seal → With Y Port (Exhaust), FKM (Fluororubber) Seal, -20 to +120°C; T/Y Port 350 bar High Pressure

A: High Temperature / Special Version (Different from B's Standard Temperature NBR)

One Sentence: D633-314A = NG6 + 75 L/min@35bar + 350bar Full Port High Pressure + Direct Acting Without Pilot + 120–150Hz High Frequency Response + With Y Port (High Pressure Return Oil) + FKM High Temperature Seal

II. Core Parameters (Δp = 35 bar)

Rated Flow: 75 L/min (Maximum of D633 Series)

Maximum Pressure: 350 bar (P/A/B/T/Y) (Full Port High Pressure) Moog Inc.

Hysteresis: <0.2%

Resolution: <0.1%

Frequency Response (±100%): 120–150 Hz (High Frequency Gear)

Step Response: ≈8 ms

Zero Position Leakage: ≈0.8 L/min (210 bar)

Seal / Temperature: FKM (Fluororubber), -20 to +120°C (40°C higher than NBR)

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 Restored After Power Off, With Y Port High Pressure Return Oil, D633 Series Only High Frequency + High Temperature + Ultimate Flow Combination

III. Comparison of D633-314A with 312B/313B (Key Differences) Table

Project D633-312B D633-313B D633-314A

Flow rate 75 L/min 75 L/min 75 L/min

Frequency response 60–90 Hz (standard) 120–150 Hz (high frequency) 120–150 Hz (high frequency)

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

Temperature upper limit +80℃ +80℃ +120℃ (40℃ higher)

Model suffix B (standard) B (standard) A (high temperature / special)

Positioning High-flow standard dynamic High-flow high-frequency dynamic High-flow + high-frequency + high-temperature dynamic

Sentence: 314A = the upgraded high-temperature sealing version of 313B, with the same flow rate / frequency response, and a temperature upper limit + 40℃, the ultimate choice for high-temperature environments in the D633 series

Four. Application scenarios

NG6 small installation surface, 75 L/min high flow rate + 350 bar full-mouth high pressure + 120–150 Hz high frequency response + high temperature (≤120℃)

T/Y port high-pressure return oil (≤350 bar), Y port must be external leakage Moog Inc.

High-speed + high-temperature precision control: metallurgical hot rolling line, die-casting machine high-temperature conditions, heavy press machine high-temperature oil, high-frequency fatigue test machine high-temperature environment, high-speed injection molding machine high-temperature injection. Installation space is limited, requiring extreme flow rate + top-level dynamic + high-temperature tolerance high-pressure system