Model Number Designation

The charts shown below illustrate the model numbering system. The first 3 or 4 letters describe the type of actuator and the operating system. This is arrived at by referring to the description of the individual products. The second group of numbers represent the size of actuator unit, its cylinder diameter and scotch yoke characteristics.

The size of actuator is determined by the torque or thrust requirement of the.valve. With knowledge of the valve requirement the optimum actuator can be selected from the appropriate performance data.

The remaining digits refer to power pack type and size. This is determined by speed of operation requirements; consumption limitations; supply available; etc. Other digits will identify alternative or fail safe systems, and include spring return units; accumulator or reservoir energy storage.
The examples below show typical Ledeen actuator model numbers and how they are built up.