Cashco HP-1+6+S - Manual (Page 3)

IOM-HP-S-DIFF 3
6. Adjusting screw (6) o-ring inspection:
a. With locknut (7) and closing cap (28)
re moved, turn adjusting screw (6) CW as
far as possible by turning fl ats on top end.
Care ful ly reach inside spring cham ber (2)
and grasp ad just ing screw (6) by hand.
NOTE: For 1/2" (DN15) and 3/4" (DN20)
size reg u la tors a small piece of plastic
tubing with a 3/4" (19 mm) inside di am-
e ter may be used to grasp the ad just ing
screw (6). Complete ad just ing screw (6)
removal by ro tat ing CCW. See Figure 1.
b. Inspect the backup ring (32) and quad
ring (31) for wear. If nicked or torn - re-
place. NOTE: Make certain the tefl on
backup ring (32) will insert into spring
cham ber (2) before the quad ring (31).
(See Fig ure 3 blow-up illustration). Make
sure the quad ring (31) is on straight with
no twist. Use a good grade light weight
grease on both ring seals (31,32).
Figure 1: Adjusting screw (6) o-ring inspection.
A. General:
1. Maintenance procedures hereinafter are
based upon re mov al of the regulator unit
from the pipeline where in stalled.
2. Owner should refer to owner's procedures for
removal, handling, cleaning and dis pos al of
nonreusable parts, i.e. gaskets, etc.
3. Refer to Figure 3 for view of regulator.
WARNING 2
SPRING UNDER COMPRESSION. Relieve spring com-
pression prior to re mov ing diaphragm fl ange bolts .
Fail ure to so may result in fl ying parts that could cause
per son al injury.
CAUTION C
DO NOT AT TEMPT TO REMOVE ADJUSTING SCREW (6)
FROM TOP OF SPRING CHAM BER (2). The ad just ing
screw (6) is threaded upward from inside the spring cham-
ber (2). The CCW ro ta tion used to relieve range spring (14)
tension will come to a stop. At the stop ping point, do not
apply any torque to ad just ing screw (6) or dam age may
occur and ren der the unit in op er a ble. See Figure 1.
CAUTION D
When body fl ange hardware (9,23,34,35) is re moved from
this unit it should al ways be replaced with new. The new
hardware (9,23,34,35) must have the prop er grade spec i-
fi ca tion iden ti fi ca tion markings and meet the following
standards:
1. All cap screws (23) and fl ange stud nuts (9) must have
"heavy hex heads".
2. All studs (34,35) and cap screws (23) must comply with
or exceed the requirements of ASTM A-193, Grade B7.
3. All fl ange stud nuts (9) must comply with or exceed
the requirements of ASTM A-194, Grade 2H.
New body fl ange hardware (9,23,34,35) may be pur chased
from Cashco, Inc. or through the OEM.
B. Diaphragm Replacement:
1. Securely install the body (1) in a vise with the
spring chamber (2) directed upwards.
2. To relieve range spring (14) compression,
re move clos ing cap (28) by turning CCW.
Re move lock nut (7) by turning CCW. Turn
ad just ing screw (6) CCW until range spring
(14) compression is relieved. NOTE: See
CAUTION C).
3. Draw or embed a match mark between body
(1) casting, body spacer (24), and spring
cham ber (2) casting along fl anged area.
4. Remove all body flange hardware
(9,23,34,35).
5. Remove spring chamber (2), range spring
(14), spring button (4), pressure plate (3), body
spacer (24), diaphragm (12), and o-rings (30).
WARNING 1
SYSTEM UN DER PRES SURE. Prior to per form ing any
maintenance, isolate the reg u la tor from the system and
relieve all pres sure. Failure to do so could result in per-
sonal injury.
SECTION VI
VI. MAINTENANCE