Installing The Stem Connector Assembly - Fisher 667 Instruction Manual

Diaphragm actuator sizes 30-76 and 87

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Instruction manual (36 pages)

Table of Contents

Instruction Manual

D100310X012

7. Slowly increase the diaphragm pressure until the upper bench set loading pressure is applied. Again, the travel stop

should be against the diaphragm casing.

8. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the

travel span shown on the travel indicator scale (key 32).

9. If the span of travel is correct, bench set is complete. Proceed to the Installing the Stem Connector Assembly

subsection.

10. If the travel span is not exact, remember the free-length and load rate tolerances for the spring may produce a

slightly different span than specified. Contact your Emerson Process Management sales office for assistance.

For Reverse-Acting Valves (PDTO [Push Down to Open])

1. If not already accomplished, push the valve stem down away from the actuator to the open position. Later, when

installing the connector, pull up the valve stem to the closed position.

2. Set the diaphragm loading pressure to a value less than the lower bench set pressure (near zero). The down travel

stop should be contacting the yoke.

3. Slowly increase the pressure towards the lower bench set pressure while checking for the first movement of the

actuator stem.

Note

Before turning the spring adjuster on size 70, 76, or 87 actuators, assemble the stem connector around the actuator stem and the

anti-rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur. Remove the

stem connector before rechecking the bench set.

4. If movement occurs before or after the lower pressure is reached, adjust the spring adjuster (see figure 4). Thread

the adjuster up or down on the actuator stem until the actuator stem movement is first detected at the lower bench

set pressure.

5. Apply the upper bench set loading pressure to the diaphragm. This will retract the actuator stem away from the

valve. Mark the end of the actuator stem on a nearby surface using tape or some other method.

6. Slowly decrease the diaphragm pressure until the lower bench set loading pressure is applied. Again, the

down-stops should be against the yoke.

7. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the

travel span shown on the travel indicator scale (key 32).

8. If the span of travel is correct, bench set is complete. Proceed to the Installing the Stem Connector Assembly

subsection.

9. If the travel span is not exact, remember the free-length and load rate tolerances for the spring may produce a

slightly different span than specified. Contact your Emerson Process Management sales office for assistance.