​Product Overview and Features

Core function: As the “execution terminal” of the control system, UG actuators receive signals from speed controllers (such as TG, UG25+Governors) or electronic controllers, and drive valves, fuel racks, etc. through mechanical displacement to adjust parameters such as speed, flow rate, and pressure.

Working principle: It adopts electro-hydraulic, electric or mechanical hydraulic drive to convert electrical signals or hydraulic power into linear or rotational motion, with fast response speed and suitable for real-time control requirements.

Main models and features

1. UG2 series

Application scenario: Basic control of small turbines or engines, compact structure.

Model example:

UG2 actuator (CW, Double Lip Drive Seal) (part number: 8251-212): suitable for clockwise rotation scenarios, dual lip drive seal, reducing the risk of oil leakage.

UG2 actuator (High Speed, Serrated Drive) (part number: 8251-218): High speed serrated drive, suitable for high-speed requirements.

2. UG15 series

Performance upgrade: Higher torque output, supporting multiple driving modes and speed ranges.

Model features:

Serrated Drive: such as UG15 actuator (Serrated Drive Shaft, High Speed, MPU) (part number: 8251-719), compatible with magnetic electric sensor (MPU) signal input.

Keyed Drive: such as UG15 Actuator (Keyed Drive Shaft, High Speed, MPU) (part number: 8251-720), the mechanical connection is more stable.

Special configuration: equipped with models such as Miss Tooth Term Shaft and Marine Gland, suitable for special working conditions (part numbers: 8251-724, 8251-734).

3. UG20 series

High torque design: suitable for medium-sized turbines or engines, with an output torque of 20 FT-LB (approximately 27 N · m).

Model example:

UG20 Actuator（Serrated Drive Shaft, Low Speed）（ Part number: 8251-766): Low speed serrated drive, suitable for low-speed and high torque scenarios.

UG20 actuator (with LVDT) (part number: 8251-764): Integrated linear variable differential transformer (LVDT), providing position feedback and improving control accuracy.

4. Other models

UG actuator (Low Speed, Key Shaft) (part number: 8251-0003): Low speed key shaft design, simple structure, low maintenance cost.

UG15 actuator with Heat Exchanger (part number: 8251-0002): equipped with a heat exchanger, suitable for high temperature environments to prevent hydraulic oil from overheating.

Core parameters and configuration

Driving mode:

Mechanical hydraulic drive (through hydraulic oil pressure) or electric drive (some models), adapted to different control logics.

Rotation direction:

Clockwise (CW) or counterclockwise (CCW) should be aligned with the direction of the equipment axis.

Feedback system:

Some models integrate sensors such as LVDT and MPU, providing real-time position feedback and supporting closed-loop control.

Certification and Protection:

Some models have been certified by CSA and ATEX and are suitable for hazardous areas (such as part number 8251-734 with marine certification).

Accessories and System Integration

Governor matching:

When used in conjunction with TG series governors (such as TG13, TG17) or UG25+Governors, it forms a complete chain of “control signal execution action”.

Monitoring and Communication:

Connect to industrial networks through MicroNet system, Flex500 platform or GAP software to achieve remote monitoring and parameter adjustment.

Maintenance kit:

Seals, springs, drive shafts and other spare parts (refer to Woodward spare parts catalog) to ensure long-term reliable operation.

Application scenarios

Industrial power generation: The main steam valve of the steam turbine generator set is adjusted to maintain stable speed.

Oil and natural gas: When a gas engine drives a compressor, the fuel input is adjusted to match the load.

Mechanical drive: drives equipment such as pumps and fans, and adjusts output power according to process requirements.

Ship power: throttle control of marine turbines or diesel engines to adapt to changes in navigation conditions.

Advantages and Characteristics

Reliability: Mature mechanical structure, redundant hydraulic system design, vibration resistance, wear resistance, suitable for harsh working conditions.

Flexibility: Multiple driving modes and feedback configurations are available, supporting on-site manual adjustment or remote electronic control.

Compatibility: Seamless integration with other Woodward control products, such as ProTech overspeed protection devices and MicroNet systems, to build a complete automation solution.