The DFPB quarter turn actuator is a rack and pinion combination that converts the linear movement of the shaft. Quarter turn actuators based on this principle exhibit an identical torque characteristic across the entire rotation angle range of 90°.

In addition to the ISO 5211 interface, all of the quarter turn actuators in the DFPB series have a socalled pressure relief slot at either end. This enables the DFPB to be mounted on all process valves regardless of whether or not the process valve features this slot, which is a requirement for the chemical industry. This greatly increases the applications of the process valves • Standards-based (VDI/VDE 3845) hole patterns 30/80 as standard for direct mounting of a range of common peripheral devices such as sensor boxes for end position display and controllers for accurate positioning