Maintenance - Emerson Fisher 2052 Instruction Manual

Instruction Manual
D103296X012
7. Before sliding the valve shaft into the lever, position the valve ball or disk as follows:
For push‐down‐to‐close action, the valve ball or disk should be in the fully open position.
For push‐down‐to‐open action, the valve ball or disk should be in the fully closed position (see the valve body
instruction manual).
8. Make sure that the index markings on the valve shaft are properly aligned with either the markings on the lever or
the travel indicator scale mounting holes. Slide the valve shaft into the lever. (See figure 4 for one possible
orientation.) Install the valve mounting cap screws and nuts. Tighten to the torque value given in the appropriate
valve body instruction manual.
9. Ensure all end play in the valve shaft is removed by directing the valve shaft and control element toward the
actuator as much as possible.
10. Tighten the socket head cap screw (key 15) which compresses the splined lever connection to the valve shaft (see
table 6). Install the cover or plug (key 2) into the access hole in the housing.
CAUTION
When adjusting the travel stop for the closed position of the valve ball or disk, refer to the appropriate valve instruction
manual for detailed procedures. Undertravel or overtravel at the closed position may result in poor valve performance
and/or damage to the equipment.
Over-rotation of the lever could result in the diaphragm stroking to the point where the diaphragm seals off against the air
signal connection. This could prevent an air signal from being able to stroke the valve.
11. Adjust the up travel stop (see figure 3) so that the valve ball or disk is in the desired position. When adjusting the
up travel stop, ensure the stop is not backed out too far, causing the lever to over-rotate. Over-rotation of the lever
may cause damage to valve components. Avoid over-rotation by adjusting the up travel stop so that the travel
indicator screws (key 22) align with the travel scale screws (key 20). See figure 3.
12. Stroke the actuator and adjust the down travel stop so that the valve ball or disk is in the desired position.
Note
Once each travel stop is properly positioned, adequately tighten the hex nut (key 24) to lock the travel stop in place.
13. Make sure that the travel indicator pointer matches the ball or disk position. Remove and install in the proper
position if necessary.
14. Refer to the table of contents for accessory installation procedures.

Maintenance

Actuator parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of
inspection and replacement depends upon the severity of service conditions. Instructions are given below for
disassembly and assembly of parts. Key numbers referenced in the following steps are shown in figure 7 for the 2052,
except as listed below or otherwise specified in the procedures.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
2052 Actuator
June 2017
7