Jordan Valve 667M Series Diaphragm Actuator - Manual (Page 3)

-3-
Spring Adjustments cont’d
3. To shift the span up, turn the spring adjustor
(Key 11) into the yoke. To shift the span
down, turn the spring adjustor out of the yoke.
For operation of the 667M Diaphragm Actuator the
actuator stem and valve plug stem must move freely in
response to the loading pressure change on the dia-
phragm.
m
aIntenance
Actuator parts are subject to normal wear and tear and
should be inspected regularly. The frequency of in-
spection and replacement of parts is dependent on the
severity of operating conditions.
WARNING:
A sudden release of pressure or any uncontrolled
process fluid can cause personal injury or damage to
property. Prior to any disassembly, be sure to:
•
Isolate the valve from the process,
• Release all process pressure
• Vent the actuator loading pressure, and
• Relieve all spring compression.
Disassembly
Although the following instructions describe how the
667M Diaphragm Actuator can be completely disas-
sembled, when inspection or repairs are required, only
disassemble those parts required to accomplish the job.
Key numbers refer to Figures 3 and 4.
1. Bypass the control valve and reduce the loading
pressure to atmospheric.
2. Remove the tubing or piping from the con-
nection in the top of the yoke (Key 9). For top-
loaded construction also remove the piping or
tubing from the connection in the upper
diaphragm casing (Key 7).
3. Thread the spring adjustor (Key 2) off the stem
(Key 3) to remove all spring compression.
4. If necessary remove the actuator from the valve
body by separating the stem connector (Key 21)
and removing the yoke locknut.
5. Remove the spring adjustor (Key 2) from the
actuator stem (Key 3) and lift the spring
seat and spring (Keys 4 and 1) out of the yoke.
6. Remove the diaphragm casing cap screws and
nuts (Keys 10 and 14) and lift off the upper
diaphragm casing (Key 7).
7. Remove the following parts: diaphragm (Key 6),
diaphragm plate (Key 5), spacer (Key 32),
cap screw (Key 11) and actuator stem (Key 3).
Be careful not to damage the O-rings (Key 25)
when pulling the threads of the actuator
stem through the seal bushing (Key 24).
Remove the stem through the housing
of the yoke so as not to pull the threads through
the seal bushing.
8. Separate the parts of this assembly by removing
the cap screw (Key 11).
9. To remove the seal bushing, remove the snap-
ring (Key 30) and lift out the bushing.
10. Remove the cap screws (Key 19), the lower dia-
phragm casing (Key 8) and the gasket (sizes 30
through 60) or O-ring (size 70) (Key 28).
11. If necessary, the down travel stops can be re-
moved (Key 33).
Assembly
1. Place a new gasket or O-ring (Key 28) on the
yoke (Key 9) and apply lubricant to the O-ring.
2. Position the lower diaphragm casing (Key 8) on
the yoke, align the holes and insert and
tighten the cap screws (Key 19).
3. If the down travel stops (Key 33) were removed,
insert and tighten them.
4. Coat the O-rings (Keys 28 and 29) with lubricant
and place them in the seal bushing (24).
5. Fill the seal bushing with lubricant, slide the
bushing into the yoke (Key 9) and install
the snap ring (Key 30).
6. Insert the actuator stem (Key 3) through the
spring housing of the yoke, then add
the lower diaphragm plate (Key 29), diaphragm
(Key 6), diaphragm plate (Key 5), and the travel
stop cap screw and spacer (Keys 11 and 32).
7. Place this assembly in the actuator, being care
ful when pushing the actuator stem through the
seal bushing that the threads do not damage the
O-rings.
Note: Over tightening the diaphragm cap screws and
nuts can damage the diaphragm. Do not exceed 20
foot-pounds (27 Newton meters) torque.
8. Install the upper diaphragm casing (Key 7) and
secure with cap screws and nuts (Keys 10 and
14). Tighten evenly using a crisscross pattern to
ensure a proper seal.
9. Install the actuator spring (Key 1) and spring
seat (Key 4). Apply lubricant to the threads of
the actuator stem and to the surface of
the spring adjustor (Key 2) that contacts the
spring seat. Thread the spring adjustor onto the
actuator stem.
10. Mount the actuator onto the valve, following
procedures in the “Installation” section
of this manual.
667M S
erieS
D
iaphragM
a
ctuator