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COPES-VULCAN 700 User Manual

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COPES-VULCAN INSTRUCTION MANUAL
MODEL 700 DIRECT-ACTING ACTUATOR
Rev.5 (08/10) Page 9 of
20 Form 01:P224:37
2.3 STEM CONNECTOR AND TRAVEL ADJUSTMENT
(CONT’D.)
2.3.4 Tandem Trim Valves
Assembly of the stem connector for a tandem trim valve is similar to that for a normal direct-seated
valve except that, due to the presence of an internal valve spring, which tends to prevent the valve
from seating, a trial-and-error procedure in which the stem clamp is successively moved up on the
valve stem will be necessary. Proceed as follows:
A. Referring to the assembly drawing, place the stem lock plate (Item 28) over the valve stem,
then thread the stem clamp (Item 27) fully on the valve stem thread. Thread the upper stem
weldment (Item 22) onto the actuator stem (Item 16) so that the bottom surface of the upper
stem weldment is approximately 0.06" (1.5 mm) above the bottom of the actuator stem.
B. Loosen the packing nuts and allow the valve stem to position itself against the valve pilot
spring. Mark the location of the valve stem.
C. With the actuator stem fully retracted, rotate the stem clamp so that the distance from the
bottom of the actuator stem to the top surface of the stem clamp is less than the required
valve travel. Then, pressurize the actuator so that the actuator stem contacts the valve stem
clamp and causes the valve to seat.
WARNING! Never exceed the actuator allowable air pressure rating. Property
damage, injury or death may occur.
Mark the valve stem position. Release the air pressure from the actuator so that the actuator
stem is fully retracted. The inner plug travel is the difference between the two marked
locations.
D. With the valve positioned against the pilot spring as in Step B and the actuator fully retracted,
set the distance between the bottom of the actuator stem and the stem clamp equal to the
required travel minus the inner plug travel minus 1/8" (3 mm).
E. If necessary, adjust the position of the indicator plate (Item 8 on the assembly drawing).

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COPES-VULCAN 700 Specifications

General IconGeneral
BrandCOPES-VULCAN
Model700
CategoryController
LanguageEnglish