Bray Triple Offset - Manual (Page 16)

14 O & M
ASME CLASS
600 & 900
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
11.0 Standard Maintenance For Class 600 and 900 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.
10.1 Packing Replacement
Refer to parts diagram for parts identification by
reference numbers. (Pg 13)
1. If the valve is installed, relieve line pressure.
Close the valve assembly with its actuator, without
applying torque. 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 the packing gland retaining nuts (H7), lock
washers (H6) and the stem key(s).
3. Disassemble the gland retainer (H3), split ring (H4)
and gland ring (H1).
4. Remove all packing rings (H2) taking care not to
scratch the stem or valve body bore.
5. Examine the valve body packing bore and the stem
surface. Clean as necessary to remove any corrosion,
foreign matter, and minor surface imperfections
before installing the new packing rings (H2).
6. 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
the external ring (H2), then internal rings (H2) and
last the second external ring (H2).
7. Reinstall gland ring (H1), split ring (H4), gland
retainer (H3), lock washers (H6) and packing gland
retaining nuts. Tighten the nuts using a cross bolting
Table 6 (Pg.
17).
8. Install the stem and key(s). Then mount actuator,
paying attention that the actuator is properly
oriented.
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