Cashco 2296HF - Manual (Page 8)

8 IOM-2296
31. 2" Body Size:
a. Place cage (19) properly ori ent ed into
body (1) cav i ty and ensure that the bottom
edge of the cage (19) shoulders onto seat
ring (3) prop er ly.
b. Place bonnet o-ring/gasket (6) into body
(1) recess.
c. Pull stem (4) upwards through the bonnet
as far as possible. Packing (10) friction
should hold the stem (4) up.
d. Observing location of matchmarks of ar-
ti cle D.1., align bonnet (2) over the body
studs (27) and lower the bonnet as sem bly
down wards to the body (1). When the
gap between the bonnet and body is ap-
proximately 1/4" (6mm) of the body (1),
push the stem (4) down wards until the
plug end of the stem (4) pushes against
the seat ring (3). Continue low er ing the
bonnet (2) until it comes to rest on the
bonnet gasket (6).
e. Install body stud nuts (28) fi nger-tight on
studs (27). In an al ter nat ing, crossing-
pat tern, and in 1/2 rev o lu tion in cre ments,
torque nuts (28) to 30-32 ft.-lbs. (40.6-43.4
N-m). NOTE: Body (1)-to-bon net (2) joint
should be drawn together with no gap.
32. Remove TFE thread sealant tape of D.19.
previous.
33. Connect a temporary gaseous pressure sup ply
( minimum of 100 psig - 6.8 Barg) to both inlet
and outlet body (1) con nec tions si mul ta neous ly.
Move stem (4) up and down man u al ly a few
times. Using leak-de tec tion solution, check
body (1)-to-bonnet (2) joint and stem packing
(10) for leakage. Tighten packing stud nuts
evenly as required to eliminate leakage.
34. Remove temporary gaseous supply pressure.
and reassemble (BA) to (AA) per Section V.C.
E. Cryogenic Construction-Opt.-36 (See Fig. 5):
1. Maintenance for cryogenic construction valve –
Option-5 or 36 – is similar to that of a standard
unit, except that a cryogenic unit includes a
wiper ring (24) with the packing fl ange (23).
2. Wiper ring (24) is located in the groove of the
cryogenic packing fl ange (23), oriented on
upper end of follower (11). See Fig. 5A or B.
3. The packing stud nuts (21) should be evenly
tightened with a torque wrench to ap prox i mate ly
9.0 ft.- lbs. (12.2 N-m).
SECTION VI
VI. CALIBRATION
A. General:
1. This section only covers cal i bra tion of the
control valve with Actuator Models C27/C53.
2. Positioner, if in stalled, requires ref er ence to
the spe cifi c positioner mod el IOM for prop er
cal i bra tion pro ce dure.
3. All indicated items numbers that are with re-
spect to IOM-C27-C53 will be in pa ren the sis
and un der scored; i.e. (20); those that reference
the po si tion er IOM will be in double paranthe-
sis; i.e. ((AP)). All item numbers that are with
respect to this IOM-2296 are not un der scored;
i.e. (3).
B. Procedure - Reverse Action, ATO-FC:
1. Reference the name plate (40) at tached to
the ac tu a tor yoke (3). De ter mine the bench
set ting of the in stalled range springs (10) from
the name plate (40); i.e. 5-15 psig (.34 -1.0
Barg), or 15-60 psig (1-4.1 Barg).
2. Connect a temporary air supply with an in-line
ad just able airset regulator and gauge to the
lower actuator con nec tion. See Section IV. A.
6. for appropriate supply pressure. DO NOT
LOAD with any air pressure at this point.
3. To determine when stem/plug (4) begins to
lift out of the seat, touch the stem above the
packing studs with one fi nger. (Stem will begin
to move when actuator pressure exceeds the
spring load.)
4. Slowly pressurize the ac tu a tor to a pres sure
equal to the lower pres sure lev el of the bench
setting; i.e. for a 5-15 psig (.34 -1.0 Barg)
range, set pressure at 5 psig (.34 Barg). Take
note of pressure reading when the stem fi rst
begins to move.