IOM-POSR-2
5
SECTION V
V. SHUTDOWN
A. General
1. On systems with a bypass valve, and where
system pressure is to be maintained as the
POSR-2 is shut down, slowly open the bypass
valve while closing the inlet (up stream) block
valve. Fully close the inlet (upstream) block
valve. (When on bypass, the system pres sure
must be constantly observed and man u al ly
regulated.) Close the outlet (down stream)
block valve. Close the nee dle valve on the
pilot valve’s sensing line.
SECTION Vl
VI. MAINTENANCE
A. General:
1. Maintenance procedures hereinafter are
based upon removal of the regulator unit from
the pipeline where installed, and main te nance
performed in a workshop.
2. Owner should refer to owner’s procedures for
re mov al, handling, cleaning and disposal of
nonreusable parts, i.e. gaskets, etc. Cash co
recommends not reusing any gaskets, but
replacing with only new and factory supplied
gaskets.
3. This regulator is supplied from the factory
using a gasket sealing aid, Federal Process
Company, PLS
2, or equal. Such compatible
sealing aids may be utilized by the Owner, if
desired.
4. All indicated item numbers that are with re spect
to the Pilot Valve will be in parenthesis and
underscored, i.e. (14), (PV). All item numbers
that are with respect to the Main Valve will
NOT
be
underscored, i.e. (1), (MV).
5. Refer to Figures 6 through 12 for item num ber
callouts.
2. If the regulator and system are to both be
shut down, slowly close the inlet (upstream)
block valve. Close the outlet (downstream)
valve only if regulator removal is required.
Close the needle valve on the pilot valve’s
sensing line.
6. Most pilot-operated valve operation problems
center around the pilot valve (PV). Cashco
always rec om mends full maintenance on any
POSR-2 pilot valve (PV) once a POSR-2 is
removed from the pipeline.
B. Separation:
1. Observe orientation of pilot valve (PV)
with re spect to main valve (MV) position
“VD”, “H”, or “VU”, Figures 6, 7 or 8, be fore
dis as sem bling.
2. Place main valve body (1) into a vise, oriented
to allow rotation of pilot valve (PV) together
with in ter con nect ing pipe nipple (19).
3. Remove loading tubing (21) at both end fit tings
(20) by rotating nut CCW (viewed from tube-
end). Disengage union (28) where ap pli ca ble
and remove pilot valve (PV).
4. Place pipe wrench on pipe nipple (19) and
rotate CCW (viewed from pilot valve (PV)
end) to removal. Remove main valve (MV)
from vise and set aside.
5. Place pilot valve body (1) in vise. Remove
pipe nipple (19) or other pipe fittings (20, 27,
30) as is applicable.
6. Inspect the inside of the pipe and fittings
for corrosion, scaling, debris, or filming.
Prob lems here will be an indication of im prop er
condensate cor ro sion control which can
affect the overall operation of the
POSR-2. Install an upstream strainer if scale
or debris ap pears at this point.
CAUTION
Do not walk away and leave a bypassed regulator
unattended!
CAUTION
SYSTEM UNDER PRESSURE. Prior to performing any
maintenance, isolate the regulator from the sys tem and
relieve all pressure. Failure to do so could result in
personal injury.
