Woodward ProAct ITB

Integrated Actuator and Throttle Body

Guascor / Siemens Part Number Woodward Part Number
7664156 8235-178
7664119 8235-181
7664517 8235-686
7664588 8235-689
7664366 8235-689
7664315 8235-311


The ProAct™ Integrated Throttle Bodies (ProAct ITBs) are butterfly valves electrically-actuated by ProAct Analog and ProAct Digital Plus actuators to control flow output. With bore sizes ranging from 85 mm to 180 mm, these ProAct ITBs are designed for use with engines in the 1–2 MW range. The ProAct actuators are electromagnetic, 75 degree-of-travel devices, and therefore alleviate the problems associated with linkages on gas engines (such as setup, non-linearity, and wear).

This direct combination of throttle and actuator results in excellent stability and transient characteristics, and requires no hydraulics, pneumatics, or governor gear train. Therefore, you end up with an efficient, long lasting, and easily-installed throttle option.


Woodward ProAct integrated acutator and throttle body



The ProAct ITB integrated actuator and throttle body is designed to throttle air or air/fuel for gaseous engines. This system is designed for direct replacement of traditional throttle valves, and requires no linkage between valve and actuator. The three sizes are designed to cover a wide range of engines and should be selected using the sizing procedure described inside this specification.

Special features

• No linkage or couplings
• Cost effective and highly efficient
• Low maintenance
• Requires no hydraulics, pneumatics, or governor gear train
• Long lasting, easy to install throttle option
• Can be configured as an integrated speed controller or a positioner

Verified 2016 March