Figure 3-4 Constant Torque Profile; Figure 3-5 Variable Torque Linkage - Honeywell HercuLine 10260A Installation, Operation And Maintenance Manual

Variable Torque Linkage
A variable torque linkage is employed when it is desired to provide a non-linear torque profile throughout
the full range of final control element travel. In this general situation, the actuator and driven crank arms
will be set up to provide a higher torque for seating or unseating the final control element. Figure 3-5 shows
a general linkage setup to achieve a non-linear torque profile and Figure 3-6 shows the resultant profile.
Note that this linkage can be characterized in many different ways by varying start angles and rotation
requirements of both the Actuator Crank Arm and the Driven Arm.
Actuator
Crank Arm
5°
a/n 23200
2/03 10260A Series Actuators – Installation, Operations, and Maintenance

Figure 3-4 Constant Torque Profile

Vertical
Centerline
Linkage
Horizontal Offset

Figure 3-5 Variable Torque Linkage

Vertical
Centerline
45° 45°
Close Open
Damper
Crank Arm
Installation
17