Manual

IOM-SAP
3
VII. MAINTENANCE
A. General:
SECTION VII
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.
B. Main Regulator Disassembly:
off end of guide bearing and replace with new
seal. Ensure seal's u-cup is oriented with the
center-open-downwards as shown in Fig ure
1, as the u-cup seal de pends upon the inlet
pressure to activate prop er seal ing ac tion.
7. Carefully remove o-ring (39) from shoulder of
plug and replace with new o-ring.
8. Reposition the bearing guide (13) over end of
plug and carefully slide it down into the cage.
Place a new u-cup seal (35) with the center-
open-upwards into the recess at the top of the
guide bearing.
9. Place the seal retainer (36) on top of the guide
bearing and engage cap screws (38) tight into
the guide bearing.
10. Thread nut (40) on to plug threads and tighten:
Sizes - 3/4" - 1" Torque 60-70 ft. lbs.
11. Place new loading chamber seal (28) in recess
in the body fl ange face. Set loading chamber on
top of body. Align matchmarks from step B.3.
and insert nuts and bolts (11 & 12). Tighten
bolting equally in a star pattern - torque to
35-40 ft. lbs.
For 2" Size:
4. Grasp the upper part of the plug (20) with a
wrench and with a second wrench rotate nut
(40) CCW to remove nut.
5. Lift seal retainer (36) up and over threaded
end of plug (20) to remove piston seal (35).
6. Using hands, grasp guide bearing (13) and lift
upwards to remove. Slide dynamic seal (27)
off end of guide bearing and replace with new
seal. Ensure seal's u-cup is oriented with the
center-open-down wards as shown in Fig ure
1, as the u-cup seal de pends upon the inlet
pressure to activate prop er seal ing ac tion.
7. Carefully remove o-ring (39) from shoulder of
plug and replace with new o-ring.
8. Reposition the bearing guide (13) over end of
plug and carefully slide it down into the cage.
Place a new u-cup seal (35) with the center-
open-upwards into the recess at the top of the
guide bearing.
9. Place the seal retainer (36) on top of the guide
bearing.
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.
1. Shut down system in accordance Section VI.
2. Disconnect loading pressure supply line from
loading chamber. Loosen cover bolts (12) and
nuts (11) uniformly and remove from regulator.
3. Place matchmarks on body (23) and loading
chamber (4) fl anges. Remove the loading
cham ber by lifting vertically. NOTE: Seal (28)
may fall out of loading chamber recess.
C. To replace the guide bearing and dynamic seals
and plug o-ring:
For 3/4" - 1" Sizes:
4. Rotate cap screws (38) CCW and remove.
Lift seal retainer (36) up to remove seal (35).
5. Grasp the upper part of the plug (20) with a
wrench and with a second wrench rotate nut
(40) CCW to remove nut.
6. Using hands, grasp guide bearing (13) and lift
upwards to remove. Slide dynamic seal (27)