Bray Triple Offset - Manual (Page 10)

8 O & M
ASME CLASS
150 & 300
A D i v i s i o n o f B r a y I n t e r n a t i o n a l , I n c .
The Ultimate Critical Service Triple Offset Valve
O p e r a t i o n a n d M a i n t e n a n c e M a n u a l
9.0 Standard Maintenance for Class 150 and 300 Valves
WARNING
Precautions should be taken before beginning any work
on the valve assembly.
Protective clothing, as required by appropriate safety
codes, should be worn.
Relieve line pressure and close valve before:
s
Removing any actuation
s Loosening any packing gland nuts
Do not pressurize the line without an actuation device
properly installed and working on the valve.
CAUTION
The Tri Lok valve must be in the closed position to be
removed from the line to prevent damaging the disc
seal ring.
1. When replacing the seat and/or disc seal ring in a
dead-end service, or with the piping on the body seat
(replaceable) side removed, depressurize the line and
partially open the disc before loosening any of the
valve trim fasteners.
2. Clean the valve, removing any grit or scale. When
handling, care should be taken not to scratch the
disc seal ring, seat, and gasket faces on both sides
of the valve.
3. Replacement seat,disc seal ring, and other parts
are available from authorized Tri Lok sales and/or
service locations.
9.1 Packing Replacement
Refer to parts diagram for parts identification by
reference numbers. (Pg. 7)
1. If the valve is installed, relieve line pressure. Remove
actuator from the valve. Remove socket head cap
screws and lock washers (M2 & M3). Remove
mounting bracket or mounting plate (M1), depending
on valve size. Note assembly positions of the
actuator and the mounting hardware for subsequent
reinstallation.
2. Remove packing gland retainer nuts (H7) and lock
washers (H6). Remove gland retainer (H3), anti-
blowout retaining ring/split ring (H4) and gland
ring (H1).
3. Remove all packing (H2), taking care not to scratch
the stem or the bore of the valve body. Do not remove
the thrust washer (H10) unless further valve disas-
sembly is required.
4. Examine the valve body packing bore and the stem
surface. Clean as necessary to remove any corrosion,
foreign matter, and minor surface imperfections.
5. Apply a small amount of grease to the stem end. Install
new packing rings (H2) in valve body packing bore
one at a time. Install the new packing rings (H2) into
(H2), then internal rings (H2) and last the second
external ring (H2).
6. Reinstall gland ring (H1), anti-blowout retaining ring
(H4) and gland retainer (H3). Re-install lock washers
(H6) and nuts (H7). Tighten gland nuts (H7), utilizing
a cross bolting technique, to the proper torque value
given in
Table 2 (pg. 12).
7. Reinstall mounting bracket or mounting plate (M1)
with cap screws and lock washers (M2 & M3).
Remount actuation device on top of the valve.
8. Operate the valve open and closed several times to
check for binding and to set the stem disc seal rings.
Loosen gland nuts (H7) and retighten, utilizing a
cross bolting technique, to torque value given in
Table 2 (pg. 12).
9. Install the stem and key(s). Then mount actuator,
paying attention that the actuator is properly oriented.
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