Woodward ProAct™ ITB Integrated Actuator and Throttle Body for Large Bores (85 mm to 180 mm)

Description

The ProAct™ Integrated Throttle Bodies (ProAct ITBs) are butterfly valves

electrically actuated by ProAct 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 MW to 2 MW range. This is an electromagnetic actuator with

75 degrees of travel, which alleviates 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.

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.