cashco 987 Manuale di installazione, funzionamento e manutenzione - Pagina 5
Sfoglia online o scarica il pdf Manuale di installazione, funzionamento e manutenzione per Unità di controllo cashco 987. cashco 987 15. Globe-style pneumatic control valve body iom
Stampa la pagina"For ATO-FC units ONLY, release all
temporary air pressure."
B. Actuator Removal:
1. Secure the body assembly (BA) in a vise with
the actuator assembly (AA) oriented vertically.
Place matchmarks between the body (1),
bonnet flange (7) and the yoke (3) to assist in
final ori en ta tion when the body is dis as sem bled
and/or the actuator removed.
2.
(Note PA.) Using a blunt end tool, ham mer
rap the tool to loosen yoke nut (15) turning
CCW (viewed from above) ap prox i mate ly
2 rev o lu tion. Secure the ac tu a tor stem (6).
Loos en the stem jam nuts (17) by rotating
CW (viewed from above) one-at-a-time until
ro ta tion stops.
3.
Fully loosen any accessory de vic es that are
con nect ed to the stem (6) or (4), such as
ac ces so ry plate ((AP)) for po si tion er.
4.
Loosen stem packing (10) by removing packing
stud nuts (21) CCW. (Note RP.).
NOTE: To fully disengage the actuator stem (6)
from the valve stem (4) is a two-step pro ce dure. Be
aware of the valve's stroke length as in di cat ed on the
name plate (40) before be gin ning dis en gage ment.
During the dis en gage ment, mea sure the dis tance
ex tend ed, and stay at least 1/8" (3 mm) away from
the full stroke length. Count and record the number
of rev o lu tions for each step in the box below:
No. of revolutions to disengage valve stem from
actuator stem:
Step A. ____________
TOTAL: ____________
5. For ATO-FC Reverse Action Units:
a. (Note PA.)
b.
Step A. Rotate valve stem (4) CW
(viewed from above) to disengage the
ac tu a tor stem (6) from the valve stem
(4), while holding the actuator stem (6).
Count and record the num ber of valve
stem rev o lu tions for Step A above. When
the dis en gage ment reach es about 50%
of full stroke trav el Step A is com plet ed.
(Note RP.)
c. S t e p B .
as sem bly (AA) from above.
IOM-987
Step B. ___________
S u p p o r t t h e a c t u a t o r
Fully
loosen yoke nut (15). Lift the actuator
as sem bly (AA) up wards ap prox i mate ly
1/4"-3/8" (6-8 mm). Again, rotate valve stem
(4) CW (viewed from above) to dis en gage
the ac tu a tor stem (6) from the valve stem
(4) while holding the ac tu a tor stem (6).
Count and record the number of valve stem
rev o lu tions for Step B above. This should
allow the stems (6) (4) to fully dis en gage.
NOTE: Take notice of the parts "dan gling
loosely" about the stem (4), the order of their
lo ca tion, and their proper orientation.
d. Fully raise the actuator assembly (AA) from
the valve body assembly (BA). Re move
cautiously to prevent the dan gling parts
- packing flange (23), position indicating
washer (16), ac ces so ry plate ((AP)), yoke
nut (15) - from fall ing.
6. For ATC-FO Direct Action Units:
a. Step A. Rotate valve stem (4) CW (viewed
from above) to disengage the ac tu a tor stem
(6). Do not rotate the stem (4) down into
the seating surface. Count and record the
number of valve stem (4) rev o lu tions for
Step A above. When the dis en gage ment
reach es about 75% of full stroke travel,
Step A. is com plet ed.
b. Step B. Support the actuator as sem bly
(AA) from above.
nut (15).
Lift the actuator as sem bly
(AA) upwards ap prox i mate ly 1/4" -
3/8" (6-8 mm). Again, rotate valve stem
(4) CW (viewed from above) to dis en gage
the ac tu a tor stem (6) from the valve stem
(4), while holding the actuator stem (6).
Count and record the number of valve stem
rev o lu tions for Step B. This should allow
the stems (6) (4) to fully disengage.
NOTE: Take notice of the parts "dangling
loosely" about the stem (4), the order of their
lo ca tion, and their proper orientation.
c. Fully raise the actuator assembly (AA) from
the valve body assembly (BA). Re move
cau tious ly to prevent the dan gling parts
– packing flange (23), po si tion indicating
washer (16), ac ces so ry plate ((AP)), yoke
nut (15) - from falling.
Fully loosen yoke
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