Other Specially Prepared Valves; Disassembly Instructions; Cleaning, Inspection And Lubrication Instructions; Figure 3: Ball Stop Installation With Tamper-Resistant Cover - Flowserve McCANNA User Instructions

Seals
Tamper
Resistant
Cover
Figure 3: Ball stop installation with
tamper-resistant cover
For valves with carbon graphite seats, back off setscrew
(turn counterclockwise)
ceramic seats, turn in (turn clockwise) setscrew
Lock set screw position by tightening follower to 15 ft­lb
while holding setscrew to prevent movement. Re­install
tamper cover.
3.5.3 If through valve leakage is not satisfactorily reduced or eli­
minated by ball stop adjustment, ball, seal or body sealing
surfaces may be damaged, and disassembly for inspection/
repair is required (see Disassembly/ Reassembly sections).
3.6

Other Specially Prepared Valves

Some valves with special preparation such as for oxygen,
chlorine, vacuum or other special services may have special
maintenance instructions. See any special instructions which
were supplied with the valve shipment.
NOTE: These instructions may be obtained from your
McCANNA distributor.
4 DISSASEMBLY
WARNING: Do not attempt any maintenance of these valves
while in operation or under pressure. Actuated valve air and/
STOP!
or electrical power supplies must be locked off and isolated
prior to any maintenance work. To do otherwise may result in
significant equipment damage, hazardous material dis charge
or serious personal injury.
4.1

Disassembly Instructions:

NOTE: Refer to McCANNA SEAL Parts Identification (Figure 4)
for this section.
NOTE: Make sure valve is in full open position, and remove
actuation assembly (handle, gear or power actuator).
CAUTION: Do not try to remove ball while in closed position.
Damage to ball sealing surfaces will be the result if this is
6 attempted.
4.1.1 Loosen handle retainer nut and remove handle, if applicable.
4.1.2 Remove bonnet nuts (or capscrews if supplied). Loosen
evenly; bonnet will lift due to internal spring.
McCANNA
Adapter Bushing
(Welded on
Both Inside and
Outside of Body)
Ball Stop
Follower
Setscrew
⁄ to ⁄ turn. For valves with metal or
1 1
4 3
⁄ to
1 1
4
User Instructions Top-Entry Valve – MMENIM2007-10-4/16 A4
™
4.1.3 Remove bonnet assembly and bonnet gasket. Remove spring
and spacer washer on McCANNA SEAL fireseal valves. Place
bonnet assembly on clean work surface.
4.1.4 Remove stem nut or retainer nut, travel stop and gland ring.
4.1.5 Slide stem out through the inner side of the bonnet. Do not
force stem out of bonnet. Severe damage may result.
NOTE: Stem has a shoulder which prevents blowout under
pressure.
4.1.6 Remove upper stem seals and grounding washer from bon­
net, taking care not to scratch the bonnet bore surface.
NOTE: Valves supplied with flexible graphite stem seals
typically do not have a grounding washer.
4.1.7 Insert a large screwdriver or similar tool into the oval slot of
the ball and loosen by moving the screwdriver in a direction
90° to the pipe line until the screwdriver rests against the
valve body (cover only gasket edge). Larger balls have a
tapped hole for eybolt lifting.
4.1.8 Carefully lift ball and seats upward by pushing down on the
screwdriver until they can be removed by hand. Seats may
have to be supported seperately from the ball.
⁄ turn.
3
NOTE: Be careful not to damage the bonnet gasket, seat or
ball surfaces.
4.1.9 Clean and inspect all parts for wear or damage. Pay particular
attention to gasket and seating surfaces, ball surface, travel
stop and soft parts.
If ball stop is installed and needs repair, disassemble by remo­
ving lockwire, cover and follower, and turn setscrew clockwi­
se until it can be withdrawn from the adapter from inside the
body. Remove and discard ball stop packing. Visually inspect
and ensure that all the ball stop packing is removed.
NOTE: Valves equipped with hard seats such as carbon
graphite or metal must be lapped to the ball. The preferred
procedure is to use a matched set from the factory. Hard seats
must be lapped to the valve body for optimum sealing.
Under normal circumstances, ceramic balls do not have to
be lapped to seats but ceramic seats should be lapped to the
valve body.
4.2

Cleaning, Inspection and Lubrication Instructions

4.2.1 After disassembly, discard stem seals (if removed) and ball
stop packing (if removed). Bonnet gaskets and removed seals
are not reuseable. Carefully clean and inspect all parts for
wear or damage, paying particular attention to seating/sealing
surfaces on ball and seats, stem journal and bonnet bore, and
body/bonnet gasket areas.
4.2.2 Damaged or worn parts should be replaced using only parts
or repair kits supplied by Flowserve. If repair is desired over
replacement, the repair should be evaluated by an authorized
Flowserve/McCANNA Repair Center to determine if repair is
possible.
NOTE: Carbon-graphite, ceramic and metal seats are lapped
flat on the body side, and match-lapped to the ball as a
set, and must be replaced as a set. Body seat surfaces for
hard seated valves are lapped flat, and must be checked for
flatness and cleanliness before reassembly. If re-lapping is
required, contact the nearest Authorized McCANNA Repair
Center.