COPES-VULCAN INSTRUCTION MANUAL
MODEL 700 DIRECT-ACTING ACTUATOR
Rev.5 (08/10) Page 11 of
20 Form 01:P224:37
3.0 MAINTENANCE
3.1 GENERAL
Actuator parts are subject to normal wear and must be inspected and replaced when necessary.
The frequency of inspection and part replacement depends on the severity of the service
conditions. Normally, only the diaphragm will require replacement.
3.2 PRECAUTIONS
Be aware that large pressure and spring forces are required to actuate a valve. Sudden release of
these forces or of valve or actuator pressure has the potential to cause personal injury or damage
to property.
Before starting to disassemble the actuator, proceed as follows:
A. Isolate the valve from the line pressure.
B. Release fluid pressure from the valve.
C. Release air pressure from the diaphragm chamber of the actuator.
D. Remove all actuator spring preload. Note that, if the actuator travel has been set up to be
less than nominal, it may not be possible to remove all preload with the spring adjuster alone.
In this case, it will be necessary to disassemble the stem connector to remove the remaining
spring preload.
3.3 DIRECT-ACTING ACTUATOR
(Refer to Figure 1 and the Actuator Assembly Drawing)
3.3.1 Disassembly
A. Bypass or isolate the valve and reduce the diaphragm pressure to atmospheric.
B. Rotate the spring adjuster (Item 21) downward on the actuator stem until all spring preload is
removed.
C. If necessary, remove the stem connector by removing the four socket head cap screws
(Item 23). Loosen the setscrew in the stem clamp (Item 27) and remove the stem clamp from
the actuator stem.
D. If necessary, remove the actuator from the valve by unthreading the hold-down nut or studs
and nuts, as applicable.
E. Remove the hex head cap screws (Item 4) and hex nuts (Item 5) and remove the cover
(Item 3).
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