Instruction Manual
D101329X012
1078 Actuator
June 2017
7
pressure from the power actuator. Use lock‐out procedures to be sure that the above measures stay in effect while
you work on the equipment.
2. Make certain that the power actuator travel stops have been properly set according to the caution given above.
3. For spring‐return power actuators, allow the power actuator to remain in the position where the spring is relaxed.
For double‐acting power actuators, apply supply pressure as appropriate to position the valve disk or ball in either
the open or closed position.
4. Note whether the valve disk or ball is in the open or closed position.
5. Rotate the handwheel to move the drive sleeve gear and travel indicator to the position that corresponds with the
position of the valve disk or ball. For both direct and reverse acting manual actuators, clockwise handwheel rotation
sets the manual actuator to the closed position. Counterclockwise handwheel rotation sets the manual actuator to
the open position.
Installing the Manual Actuator on a 1061 Size 30, 40, 60, 68, 80, or 100 and 1052 Size 70
For manual actuator installation on 1061 sizes
30, 40, 60, 68, 80, and 100; and 1052 size 70,
remove the actuator
cover (key 34) and attached parts from 1061 or 1052. Replace with 1078. Most assemblies require installation of a new
lever and splined adaptor to complete the installation. When used, the splined adaptor slides inside the new lever and
the lever is then clamped onto the splined adaptor. See figure 5.
1. Remove the lever and add a new lever and splined adaptor when needed. See figure 5.
The splined adaptor slides inside the new lever and the lever is then clamped onto the splined adaptor.
2. Disengage the manual actuator.
3. Install the manual actuator.
4. Tighten the cap screws to the final torque value.
5. For double‐acting power actuators, be certain the power actuator is equipped with a bypass valve. Operating the
handwheel mechanism against the force of differential cylinder pressures will be difficult or impossible.
Installing the Manual Actuator on a 2052 Size 1, 2, or 3
1. Remove the travel scale and travel indicator. They will no longer be required since the 1078 has it's own scale and
indicator.
2. Mount the manual actuator on the surface where the travel scale was.
3. Position the manual actuator on the 2052 so that the drive square fits into the quad square spline of the 2052 lever.
4. Bolt the manual actuator onto the 2052.
Operation
After the travel indicator pointer has been adjusted and the control valve assembly installed, the manual actuator is
ready for operation.
CAUTION
Applying too much torque to the actuator and valve parts could cause damage to the parts. To avoid such damage, do not
exceed the maximum allowable torques listed in table 2, 3, or 4 or any other torque limitation of internal valve parts. Also,
do not use wrenches or other devices on the handwheel or handwheel shaft to increase operating force.
If the force required to rotate the handwheel exceeds the wheel‐rim force listed in tables 2, 3, and 4, refer to the
maintenance procedure.
