Replacing Diaphragm Plate, Diaphragm Rod, Spring, And Spring Seat - Emerson Fisher 1051 Instruction Manual

Instruction Manual
D101322X012
3. Loosen the hex jam nut (key 84 for 1051, or key 86 for 1052) on the up travel stop. This stop is nearest to the
positioner or positioner cover (key 39; also see figure 3). Screw the travel stop in (turn it clockwise) until it can be
verified that all spring tension has been removed from the diaphragm stop in the upper diaphragm case, i.e. when
any movement of the travel indicator pointer is observed, all spring tension against the upper diaphragm case stop
has been removed. Do not rotate the travel stop past this position as additional compression of the spring is not
necessary or desirable.
4. Carefully remove all cap screws and hex nuts (keys 5 and 6) from the diaphragm case.
5. Remove the diaphragm case and the diaphragm (key 3).
6. Inspect the diaphragm plate (key 4). If the diaphragm plate is damaged or if further disassembly of the actuator is
required, proceed to the Diaphragm Plate, Diaphragm Rod, Spring, and Spring Seat procedure.
7. Inspect the diaphragm and replace if necessary.
Assembly
1. Place the diaphragm (key 3) on the diaphragm plate (key 4), making certain that it is properly centered.
2. Make sure that the up travel stop (see figure 3) is screwed in sufficiently to eliminate interference of the diaphragm
plate (key 4) with the upper diaphragm case.
3. Observe the correct position of the loading connection fitting and install the upper diaphragm case (key 1). Replace
the cap screws and nuts (keys 5 and 6) which secure the upper diaphragm case to the actuator housing. Tighten the
nuts in an alternating fashion (see table 2).
CAUTION
When adjusting the travel stop for the closed position of the valve ball or disc, refer to the appropriate valve body
instruction manual for detailed procedures. Undertravel or overtravel of many valve types may result in poor valve
performance and/or damage to the equipment.
4. Adjust the up travel stop (see figure 3). If the upper travel stop establishes the closed position of the valve ball or
disc, refer to the valve body instruction manual and follow the procedures given for properly establishing the closed
position. Proceed as appropriate:
For F, G, and J mounting adaptations, perform operations beginning with step 8 under the appropriate mounting
adaptation section of the Actuator Mounting and Changing Actuator Mounting procedure.
For H mounting adaptations, perform operations beginning with step 7 under the appropriate mounting adaptation
section of the Actuator Mounting and Changing Actuator Mounting procedure.
5. Return the travel indicator pointer to its original position as previously marked on the travel indicator scale.
6. Install the inlet piping to the upper diaphragm case.
Replacing Diaphragm Plate, Diaphragm Rod, Spring, and Spring Set
Disassembly
1. Perform steps 1 through 6 of the Disassembly portion of the Replacing Diaphragm procedure above.
For 1052 Actuators Only
a. Before removing the diaphragm plate, spring compression must be relieved. Proceed as appropriate to gain
access to the spring adjusting screw:
1051 and 1052 Size 33 Actuators
June 2017
13