Cashco 31-N - Manual (Page 6)

IOM-31-N 6
21. In an alternating cross-pattern, tighten screws
(9) in one revolution increments. Repeat
pattern until torque reaches 25–30 in-#
(2.8–3.4 N-M).
22. Engage adjustment screw (18) the same
num ber of revolutions as recorded from Step
2 previous.
23. Remove and replace closing cap gasket (6).
Re place closing cap (5) and fi nger tighten
only.
C. Trim Replacement:
1. Place body (1) into a vise and secure. Paint
or embed a match mark between lower case
(3) and body (1).
2. Loosen both cap screws (11) bolting the ac-
tu a tor assembly (AA) to the body (1). Holding
the actuator assembly (AA) in hand, rotate cap
screws (11) to removal. NOTE: The ac tu a tor
assembly (AA) may be rotated around the
stem (24) axis during this procedure.
3. Place actuator assembly (AA) in a vise or on
a work bench to allow cleaning of the gasket
(8) surface of the lower case (3) with a fl at
tool. Use spray solvent as necessary (do not
im merse).
4. Remove “rubber” seat (27) from end of stem
(24); examine and discard. Place new seat
(27) onto end of stem (24). For sizes 1-1/2"
and 2" (DN40 & 50), a defl ector ring (32) is
included. Ensure the proper orientation of the
defl ector ring (32) when pushing the new seat
(27) into position. (See Figure 6.)
5. Return to the body (1) in vise. Observe po si tion
of “split” in loading ring (25, 33) with respect
to proper location as indicated in Figure 4.
Using both thumbs, push the interior walls to
pry apart the split of the loading ring (25, 33),
until the ring (25, 33) slips off the orifi ce (26).
Remove the loading ring (25, 33).
6. Remove the body (1) from the vise. Clean the
gasket (8) recess of the body (1) with a fl at
tool. Solvent clean body (1). Replace body
(1) into vise.
7. Examine orifi ce (26) for damage to the seat-
ing edge. Replace orifi ce (26) if damaged. To
remove orifi ce (26), place a socket over the
orifi ce (26) hex, and rotate CCW to loosen/
remove. When replacing orifi ce (26) use
pipe sealant PLS-2 or PST Loctite. Rotate
CW to tighten orifi ce (26); tighten to 35–40
ft-# (47.4–54.2 N-M). NOTE: Do not replace
orifi ce (26) without re plac ing seat (27).
8a. Examine glass-fi lled nylon loading ring (25) for
sizes 1/2" thru 1" (DN15 thru 25). This piece
may wear “notches” at the location where the
loading ring (25) touches the orifi ce (26) “hex
points”. It is necessary that the loading ring
(25) be “clamped snugly” to the orifi ce (26);
replace loading ring (25) if fi t is loose.
8b. Examine SST loading ring (33) for sizes
1-1/2" and 2" (DN40 & 50). Assure that the
three impression points (2 rectangular, 1
cir cu lar) are still present; if an impression
point is missing, replace loading ring (33). It
is nec es sary that the loading ring (33) “clamp
snugly” to the orifi ce (26) to prevent rotation;
replace loading ring (33) if fi t is loose.
9. Refer to Figure 4 for proper alignment of
load ing ring (25, 33) split. Using both thumbs,
push the interior walls of the loading ring (25,
33) apart and lower the loading ring (25, 33)
down into the body (1) cavity, and over the
orifi ce (26). Release thumbs. Assure loading
ring (25, 33) “clamps snuggly”. Re peat until
load ing ring (25, 33) is prop er ly located per
Figure 4. The “split” of the loading ring (25)
is factory as sem bled along the body (1) axial
centerline for body sizes 1/2" - 1" (DN15 -
25), and for loading ring (33) at the 21° mark
on the body (1) for body sizes 1-1/2" and 2"
(DN40 & 50). For all body sizes the “split” in
the loading ring (25, 33) is located opposite
the fl ow direction.
10. Place gasket (8) into body (1) recess.
11. Reposition actuator assembly (AA) into po si-
tion by hand, aligning body (1) bolt holes with
bolt holes in lower case (3). Insert two cap
screws (11) and fi nger tighten in an al ter nat ing
cross pattern.
12. Wrench tighten cap screws (11) in an al ter-
nat ing cross pattern to a torque of 8–10 ft.-#
(10.8–13.5N-M).
D. Linkage Lever and Stem Replacement:
1. Remove diaphragm sub-assembly (DSA) as
de scribed in Section VI.B., Steps 1 thru 7.