Description
Product Description
The MOOG D633-359B is a direct-drive hydraulic servo valve from the D633 series, designed for precise hydraulic flow control in industrial automation and motion-control systems. Its integrated electronics and linear force motor directly position the valve spool without requiring a separate pilot stage. This design supports responsive flow regulation in applications such as industrial machinery, hydraulic test systems, metal-forming equipment, and power-generation control.
The D633 series uses an analog command interface and a standardized hydraulic mounting pattern. The valve is designed to return its spool to a spring-centered position when electrical power is lost. Before installation, verify the complete D633-359B designation, revision F marking, command-signal configuration, hydraulic mounting interface, and electrical connector arrangement against the existing system. The 24 V supply must comply with the valve’s specified voltage range.
D633-359B
Product Parameters & Datasheet
- Brand: MOOG
- Model: D633-359B
- Revision: F
- Series: D633 Direct-Drive Servo Valve
- Product Name: Direct-Drive Hydraulic Servo Valve
- Product Type: Electrohydraulic flow-control valve
- Actuation: Direct drive using a permanent-magnet linear force motor
- Control Interface: Analog; exact command option depends on the valve configuration
- Supply Voltage: 24 VDC nominal; D633 series specification is 19–32 VDC
- Maximum Current Consumption: Approximately 1.2 A for the D633 series
- Power Consumption: Approximately 9.6 W at neutral and up to 28.8 W maximum at 24 V, per D633 series specifications
- Mounting Standard: ISO 4401 Size 03 (NG6) for the D633 series
- Rated Flow: Up to 40 L/min at a 35 bar pressure drop per spool land for the D633 series; exact valve configuration must be verified
- Maximum Flow: Up to 75 L/min for the D633 series, depending on configuration and operating conditions
- Maximum Operating Pressure: Up to 350 bar at ports P, A, and B for the D633 series; return-port limits depend on configuration
- Electrical Connection: 6-pin plus protective earth (6+PE) for the D633 series
- Place of Manufacture: Verify from the individual valve’s nameplate
- Dimensions: Confirm using the dimensional drawing for D633-359B Revision F
- Weight: Confirm from the exact model’s datasheet or product label
- Country of Origin: Verify from the unit label and shipping documentation
- Product Status: Used unit listed in the supplied product reference; condition should be inspected before installation
- Discontinued: Current lifecycle status requires confirmation from MOOG
Recommended Models
The following MOOG servo-valve series and related models may be relevant for hydraulic flow-control applications. Their functions, flow ratings, mounting sizes, and electrical interfaces can differ; they are not guaranteed direct replacements for D633-359B.
- D633 Series — Direct-drive servo valves for analog hydraulic flow control.
- D634 Series — Larger direct-drive valve series for higher flow requirements.
- D636 Series — Direct-drive servo valves with integrated electronics for configurable control applications.
- D637 Series — Related direct-drive servo-valve series with different pressure-rating options.
- D638 Series — Direct-drive valve series for industrial hydraulic control.
- D639 Series — Related direct-drive servo-valve series with configuration-dependent pressure limits.
- D633-308B — D633-series model designation; confirm full configuration before comparison.
- D633-313B — Related D633-series variant; verify the exact ordering code.
- D633-317B — D633-series option for evaluation against existing hydraulic requirements.
- D633-329B — Related D633-series designation; confirm electrical and hydraulic compatibility.
- D633-333B — D633-series variant; verify flow and command-signal specifications.
- D633-339B — Related model designation; check the complete valve code.
- D633-349B — D633-series option to compare against the installed unit’s specifications.
- D633-359B — Exact model for like-for-like sourcing; match Revision F and the full nameplate details.
- D634 Series — Alternative direct-drive series when the application requires a different nominal size or flow capacity.
