Cashco SA5 - Manual (Page 3)

IOM-CA5/SA5 3
VII. MAINTENANCE
A. General:
1. The regulator may be serviced without re mov-
ing the regulator from pipeline. The reg u la tor
is designed with quick-change trim to simplify
maintenance.
2. Record the nameplate information to req ui si-
tion spare parts for the regulator. The in for-
ma tion should include: Size, Product Code,
and Serial Number.
3. Refer to Section IX for recommended spare
parts. Only use original equipment parts sup-
plied by Cashco/KM for re build ing or re pair ing
regulators.
4. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of
nonreuseable parts, i.e. seals, etc.
5. The Inner Trim is re moved and replaced in the
body ( 23) as an assemblage of parts. The
Inner Trim Assembly, here in af ter called ITA,
consists of the fol low ing parts:
SECTION VII
6. A detailed view of the dynamic side seal parts
is shown in Figure 1; an assembled ITA in
Figure 2; and a cross-sectional drawing of
the entire regulator is shown in Figure 3.
Figure 1: Dynamic Side Seals
2. Loosen adjusting screw lock nut (2) and relax
range spring (6) pressure by turning ad just-
ing screw (1) CCW (viewed from above) until
removed from spring cham ber (4).
3. Loosen the diaphragm fl ange bolts (11) and
nuts (12) uniformly. Remove bolting (11,12).
4. Place matchmarks on body (23) and spring
chamber (4) fl anges. Remove the spring
cham ber (4) by lifting vertically.
5. Remove the ball (14), spring follower (5) and
range spring (6).
6. Remove upper diaphragm pressure plate (8).
7. Remove diaphragm(s) (9) and examine to
de ter mine if failed. If diaphragms (9) failed,
de ter mine if op er at ing con di tions are ex ceed ing
designed pressure or tem per a ture limits.
8. Remove metal C-ring seal (28) from body (23)
di a phragm fl ange groove.
9. Evenly loosen the three cage cap screws (18)
in single revolution increments and remove
screws and washers (17).
Type UC - U-Cup
Dynamic Seal
Type CP - Cap
Dynamic Seal
WARNING
SYSTEM UNDER PRESSURE. Prior to per form ing
any maintenance, isolate the reg u la tor from the
sys tem and relieve all pressure. Failure to do so
could result in personal injury.
B. Main Regulator Disassembly:
1. Shut down the system in accordance with
Section VI.
Item Dynamic
No. Seal Type Part Description
13 ..................... All ..........................Piston-Guide Bearing
15 ..................... All ................................ Cage O-ring Seal
16..................... UC.................................................Shim
19 ..................... All ................................................... Cage
20 ..................... All ...........................................Valve Plug
21 ..................... All ............................................ Seat Ring
27 ..................... All ............................. Dynamic Side Seal
27.1 .............. CP............................................. Cap Seal
27.2 .............. CP..........................O-ring Energizer/Seal
27.3 .............. UC .......... U-Cup Seal w/Metal Energizer
31 .................... All .............................................Seat Disc
32 .................... All ........................................Disc Washer
34 .................... All ...........................................Cap Screw