Application

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.

 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

 Some may be configured as an integrated speed controller or a positioner

Determining the Proper Valve Size

The proper size valve can be determined using the equation below. The required Cv (flow coefficient)

should be calculated for both the minimum and maximum flows expected on the application. This design

allows for a nominal travel of 75 degrees of rotation.

Using the graph and table below, select the closest valve that has a Cv equal to or greater than the

calculated maximum flow value at approximately 80 % opening (60 degrees) to ensure reasonable flow

margin. Also, check that the particular valve’s minimum Cv listed below is less than the minimum

calculated Cv for good low idle performance.

For further assistance, consult the Woodward engineering department.