Leslie Controls CONTROL VALVES SINGLE PORTED DOS - Manual (Page 10)

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Figure 8 - Direct Acting Diaphragm Actuator
Figure 9-Reverse Acting Diaphragm Actuator
NOTE: To check actuator spring and other
components in size 135R disassemble spacer
(33) and lift out parts. In 35R, 55R and 85R
parts are taken out from the underside.
Reassemble spring adjuster (40), washer (39),
actuator spring (36), top spring seat (30) to
actuator stem (35) (If they have been removed).
Replace assembled parts in yoke (34). Place
stem seal collar (31) on actuator stem (35).
Reassemble spacer (33) to yoke in 135R.
Position stem seal collar (31) on actuator stem
(35). In sizes 55R, 85R and 135R place bead of
stem seal in recess of stem seal collar.
In 35R and 135R actuators reassemble lower
diaphragm base (21) to yoke (34). Assemble
nuts (24) to spacer studs (32) in 135R. Tighten.
In 35R insert capscrews (23) through holes in
lower diaphragm case and diaphragm and into
threads in yoke. Tighten after presetting stem
seal as described below.
In 55R and 85R actuators replace sealing ring
(27) and screws (28). Tighten.
Presetting Stem Seal
(55R, 85R & 135R)
Place collar (22) on stem seal (29) making sure
that bead on stem seal enters recess in collar.
Reassemble diaphragm (20) over actuator stem
(35). Fit center hole in diaphragm around raised
face of collar (22). Replace diaphragm plate (17)
and self-locking nut (16). Hold actuator stem
steady with rod through yoke and stem (55R,
85R, 135R) or with wrench on flats on actuator
stem (35R) then tighten self-locking nut.
Replace upper diaphragm case (15) and
bolts/nuts. Tighten as described previously. See
Instruction Sheet 10/0.5.8 for precautions to
observe when replacing seals.
Presetting Stem Seal – (135R)
Place collar (22) on stem seal (29), assemble
self-locking nut (16) to actuator stem (35) and
tighten down against parts. Then press actuator
stem downward to make stem seal move to taut
position. Tighten capscrews and remove self-
locking nut (16).
All Actuators
Set preload on actuator spring, reassemble
actuator to valve body assembly, if it has been
removed, adjust valve for rated travel and
reconnect operating medium tubing.