Cashco PGR-1 - Manual (Page 3)

IOM-PGR-1 3
VI. SHUTDOWN
1. Shutoff inlet block valve.
2. Allow suffi cient time for the line pressure down-
stream of the inlet block valve to bleed down.
3. Shutoff the outlet block valve.
4. Relieve any trapped upstream and downstream
pressure and loading pres sure from PGR-1.
5. 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
SECTION VII
A. General:
1. The main regulator body 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 name plate information to req-
ui si tion repair parts for the regulator. This
in for ma tion should include: Serial Number
and Product Code.
3. Refer to Section IX for recommended repair
parts. Only use original equipment parts
sup plied by Cashco 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
“special clean” – Opt-56, maintenance must
include a level of cleanliness equal to Cashco
cleaning standard #S-1542.
5. The Inner Trim is re moved and replaced back
in the body (1) as an assemblage of parts.
The Inner Trim Assembly, here in af ter called
ITA, consists of following parts: (See Figure
1)
A detailed view of the dynamic side seal
parts is shown on page 5.
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.
SECTION VI
B. Main Valve Disassembly:
1. Shut down system in accordance Section
VI.
2. Disconnect the external sensing line from
the pilot valve sensing port.
3. Though it is possible to disassemble the
valve unit while installed in a pipeline, it is
rec om mend ed that all maintenance be done
in a shop. The instructions hereafter will as-
sume in shop disassembly. Remove valve
from pipeline.
4. Place the main valve unit in a vise with the
cover dome (2) upwards.
5. Loosen all fi tings and remove tubing that
connect the inlet fi lter to the stablizer, the
cover dome to the metering valve and the
outlet of the metering valve to the outlet of
the body.
6. Loosen and remove the two nuts (24) that
secure the mounting bracket (3) and pilot to
the cover dome (2). Set pilot assembly aside.
Place match marks on the cover dome fl ange
to mark the location for the mounting bracket
and two longer bolts (23).
Item Dynamic
No. Seal Type Part Description
4 .......................All....................................................Cage
5........................All......................................................Plug
9
...................... All .....................................Guide Bearing
10......................All......................................................Seat
13 ..................... All ................................. Static Stem Seal
13.1 ............... All ...................... Upper Static Stem Seal
13.2 ............... All ......................Middle Static Stem Seal
13.3 ............... All ...................... Lower Static Stem Seal
14 ......................All..................................Cage O-ring Seal
15......................OR...........................Dynamic O-ring Seal
15.1...............UC............................Dynamic U-cup Seal
15.2............... UC.......................................Seal Retainer