Cashco 6987 - Manual (Page 3)

IOM-6987 3
A. General:
1. Maintenance procedures hereinafter are
based upon removal of the regulator unit
from the pipe line where installed.
2. Owner should refer to owner's procedures for
re mov al, handling, cleaning and disposal of
non reuseable parts, i.e. gaskets, etc.
3. Refer to Figure 2 for basic regulator parts.
B. Diaphragm Replacement:
1. For regulators with NPT end connections
only, fabricate the special tool de scribed in
Figure 1. Rotate the No. 10-32 bolt CW to col-
lapse the piston spring (20). This will hold the
renewal unit (17) in place during dis as sem bly.
For all other end con nec tion options, proceed
with Step 2.
2. Securely install the body (1) in a vise with the
spring chamber (2) directed upwards.
3. Loosen the adjusting screw lock nut (5) and
rotate the ad just ing screw (17) CCW until
re moved from the spring cham ber (2).
SECTION VI
VI. MAINTENANCE 4. Draw or em bed a match mark on the body (1)
and spring chamber (2) fl anges.
5. If the special tool in Figure 1 is not being used,
the piston spring (20) is always under ten-
sion. Therefore remove all fl ange bolts (13)
except two located on opposite sides. Turn
remaining two fl ange bolts (13) CCW using
even in cre ments. The piston spring (20) will
force the body (1) and spring cham ber (2) to
separate.
6. Remove spring chamber (2), spring but-
tons (4), range spring (6), ball bearing (9),
pressure plate (8), diaphragms (10), and
diaphragm gasket (11).
7. Inspect pressure plate (8) for de for ma tion due
to over-pressurization. If de formed, re place.
8. Clean all parts to be reused according to
own er's procedures. NOTE: On reg u la tors
orig i nal ly sup plied as “spe cial cleaned”, Op-
tion-55, main te nance must in clude a level
of clean li ness equal to Cash co’s clean ing
stan dard #S-1134. On reg u la tors orig i nal ly
sup plied as “spe cial cleaned”, Op tion-56,
main te nance must in clude a level of clean li-
ness equal to Cash co’s clean ing stan dard
#S-1542. Con tact fac to ry for details.
SECTION V
2. If the reg u la tor and system are both to be shut-
down, slowly close the inlet (upstream) block
valve. Close the outlet (downstream) valve only
if regu la tor re moval is required.
V. SHUTDOWN
1. On systems with a bypass valve, and where sys-
tem pres sure is to be maintained as the regu la tor
is shut down, slowly open the bypass valve while
closing the inlet (upstream) block valve. Fully
close the inlet (up stream) block valve. (When on
bypass, the system pressure must be con stant ly
observed and manually reg u lat ed. Close the out-
let (down stream) block valve.
Figure 1: Special tool for collapsing piston spring (20).
CAUTION
Do not walk away and leave a bypassed reg u la tor
un at tend ed!
WARNING
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 per-
sonal injury.
WARNING
SPRING UNDER COMPRESSION. Prior to removing fl ange
bolts, relieve spring compression by backing out the ad-
justing screw. Failure to do so may result in fl ying parts
that could cause personal injury.