Cashco DA4 - Manual (Page 3)

IOM-DA4 3
8. When fl ow is established steady enough that the
outlet (downstream) block valve is fully open, begin
to slowly close the bypass valve if installed.
9. Develop system fl ow to a level near its expected
normal rate, and reset the regulator set point by
adjusting the loading system pressure control
setpoint to the desired outlet pressure level.
SECTION VI
10. Reduce system fl ow to a minimum level and
observe pressure set point. Outlet pressure
will rise from the set point of Step 9 for a Model
DA4. The max i mum rise in outlet pres sure on
de creas ing fl ow should not exceed the 10%. If
it does, consult factory.
VI. SHUTDOWN
1. Shutoff auxiliary loading pressure source, if sup-
plied.
2. Shutoff inlet block valve.
3. Allow suffi cient time for the line pressure down-
stream of the inlet block valve to bleed down.
4. Shutoff the outlet block valve.
5. Relieve the trapped upstream and downstream
pressure and loading pres sure.
6. The regulator may now be removed from the
pipe line or disassembled for inspection and pre-
ven ta tive main te nance while in-line.
VII. MAINTENANCE
A. General:
Item Dynamic
No. Seal Type Part Description
13 ..................... All ..........................Guide Bearing/Piston
14 ..................... All ................................. Static Stem Seal
14.1 ............... All ...................... Upper Static Stem Seal
14.2 ............... All ......................Middle Static Stem Seal
14.3 ............... All ...................... Lower Static Stem Seal
15 ..................... All ................................ Cage O-ring Seal
16 .................CW,PW .............................................. Wiper
17.1 ..............CW,PW ................................. Wiper Washer
17.2 ........... OR,CP,PR ........ Camber Adjusting Washer *
17.3.................. UC.......................................Seal Retainer
19 ..................... All ................................................... Cage
20 ..................... All ...........................................Valve Plug
21 ..................... All ............................................ Seat Ring
27 ..................... All ............................. Dynamic Side Seal
27.1 ........... CP,CW ................................. TFE Cap Seal
27.2 ...........CP, CW ..................... O-ring Energizer/Seal
27.3 .............. UC .......... U-Cup Seal w/Metal Energizer
27.4 .............. OR ....................................... O-Ring Seal
27.5 ........... PR,PW ............................. Piston Ring Seal
27.6 ........... PR,PW ............. Piston Ring SST Energizer
* Metal Diaphragm Only.
SECTION VII
A detailed view of the dynamic side seal parts
is shown in Figure 1 on the next page.
6. Sub-Sections B. through F. are for con struc-
tions that do NOT include any Opt-81 High
Outlet Pressures with di a phragm support.
These con struc tions are cov ered in Sub-
Sec tion G.
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 following parts:
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 repair parts for the regulator. The
in for ma tion should include: size, KM Product
Code, Serial Number, and internal or ex ter nal
sens ing. (NOTE: Never both types of sens-
ing.) If external sensing is used, be sure that
the external sensing line is connected.
3. Refer to Section X for recommended repair
parts. Only use original equipment parts
sup plied by Cashco/KM for re build ing or
re pair ing reg u la tors.
4. Owner should refer to owner's procedures
for removal, handling, cleaning and disposal
of nonreuseable parts, i.e. gaskets, etc.
NOTE: On regulators originally supplied
as “oxygen clean” – Opt-55, maintenance
must include a level of cleanliness equal to
Cashco cleaning standard #S-1134.
WARNING
SYSTEM UNDER PRESSURE. Prior to per form ing any
maintenance, isolate the reg u la tor from the system and
relieve all pressure. Failure to do so could result in per-
sonal injury.