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VI. MAINTENANCE
SYSTEM UNDER PRESSURE. Prior to performing any
main te nance, isolate the regulator from the system and
relieve all pressure. Failure to do so could result in
personal injury.
A. General:
1.
Maintenance procedures hereinafter are based
upon removal of the regulator unit from the pipeline
where installed.
2.
Owner should refer to owner's pro ce dures for
re mov al, handling, cleaning and disposal of non-
reusable parts, i.e. gaskets, etc.
3.
Refer to Figure 1 for standard regulator (NOTE:
"LP" variation has larger di a phragm area than "HP"
variation). Refer to Figures 2 through 4 for option
blow-ups.
B. Diaphragm Replacement:
1.
Using an overhead hoist, lift regulator on to a flat
surface work bench.
SPRING UNDER COMPRESSION. Prior to re mov ing
flange bolts, relieve spring compression by removing
the ad just ing screw. Failure to do so may result in flying
parts that could cause per son al injury.
2.
Relax range spring (28) by turning ad just ing screw
(or T-bar) (32) CCW (viewed from above) until
re moved from spring chamber (13).
3.
Draw or embed a match mark between di a phragm
case (14) and spring chamber cast ing (13) along
flanged area.
4.
Remove all flange nuts (30) and bolts (29).
5.
Remove spring chamber (13), spring button (27),
and range spring (28).
6.
Draw second match mark on diaphragm case
(14) flange in alignment with a match mark on the
threaded end of the stem (58) to indicate "free
vertical movement" position of the plug (12) and
stem (58).
7.
Securing the "flats" on the threaded end of the stem
(58) with ad just able wrench, re move pressure plate
nut (24) by rotating CCW (viewed from above).
NOTE: Do not rotate the plug (12) and stem (58).
The plug (12) and seat rings (10 & 11) have been
me chan i cal ly lapped at the factory per ANSI Class
II seat leakage and assembled to pro vide op ti mum
"free vertical movement".
IOM-8310HP/LP-BASIC
WARNING
WARNING
SECTION VI
8.
Pry loose pressure plate (22) from diaphragm(s) (20)
and remove both. In spect to ensure no de for ma tion
due to over-pres sur iza tion. If de formed, replace.
NOTES: 1. Not re mov ing the pusher plate (17)
or rotating the plug (12) and stem (58) will pro vide
per for mance equal to orig i nal fac to ry per for mance
when diaphragm(s) (20) is re placed with a like
diaphragm(s) (20). Refer to Section VI.C, steps
13 and 14 for correct diaphragm setting if pusher
plate (17) or stem lock nut (19) is re moved, or valve
plug as sem bly (12) is rotated.
2. Refer to quantity of diaphragm(s) (20) in cor po-
rat ed in the bill of ma te ri als listing. De pend ing on
outlet pressure level, multiple metal di a phragms
may be "stacked".
9.
Remove diaphragm gasket (21) and pusher plate gas-
ket (18). Clean gasket sealing sur fac es thor ough ly.
10. Install new diaphragm gasket (21) on di a phragm
case (14) flange and new pusher plate gasket (18)
on pusher plate, if required. NOTE: No gaskets
utilized with a com po si tion (soft) di a phragm).
11. Position new diaphragm(s) (20) over threaded end
of valve plug assembly (12).
12. Ensuring that the curved outer rim side of the pres-
sure plate (22) rests against the diaphragm(s) (20)
directly, place the pres sure plate (22) over threaded
end of the stem (58).
13. Install pressure plate nut (24) on threaded end of
valve plug as sem bly (12) and tighten to a torque
value of 75-80 Ft-lbs (101-108 Nm) for metal di a-
phragm, or 30-35 Ft-lbs (40-47 Nm) for com po si tion
di a phragm. Main tain align ment of match marks on
the valve plug as sem bly (12) with second match
mark on di a phragm case (14) flange. NOTE: Use
two flange bolts (29) to keep multiple di a phragms'
(20) bolt holes prop er ly aligned while tight en ing
pres sure plate nut (24). DO NOT USE FINGERS
TO HOLD DI A PHRAGMS (20) DUR ING TIGHT EN-
ING OF PRES SURE PLATE NUT (24).
14. Set range spring (28) on retainer hub of pres sure
plate (22).
15. Place multi-purpose, high temperature grease into
depression of spring button (27) where ad just ing
screw (or T-bar) (32) bears. Set spring button (27)
on to range spring (28); ensure spring button (27)
is laying flat.
16. Aligning the match marks, place spring cham ber
(13) over the above stacked parts. In stall all flange
bolts (29) and flange nuts (30). Me chan i cal ly tight en
bolting (29) (30) in a cross pattern that allows spring
cham ber (13) to be pulled down evenly. Rec om-
mend ed torque values are as fol lows:
Model
8310HP
8310LP
Diaphragm
Torque
Material
ALL
45 ft-lbs (61 Nm)
ALL
45 ft-lbs (61 Nm)
Bolt
Size
5/8" Ø
1/2" Ø
3