Flowserve McCANNA CryoSeal Ball Valves - Manual (Page 8)

McCANNA CryoSeal ® Ball Valves FCD MMENIM2007-01-AQ – 04/15
8
4
Disassembly
4.1. Dissassembly
a WARNING: Do not attempt any maintenance of these valves while in operation or under
pressure. Actuated valve air and/or electrical power supplies must be locked off and isolated
prior to any maintenance work. Failure to do so may result in significant equipment damage,
hazardous material discharge, or serious personal injury.
4.1.1. Refer to CryoSeal Parts Identification (Figure 3) for this section.
4.1.2. Make sure valve is in full open position, and remove actuation assembly (handle, gear, or power
actuator).
a CAUTION: Do not try to remove ball while in closed position. Damage to ball sealing surfaces
will result if this is attempted.
4.1.3 Remove bonnet nuts. Loosen evenly; bonnet will lift due to internal spring.
4.1.4 Remove bonnet assembly, spring, and bonnet gasket. Place bonnet assembly on clean work
surface.
4.1.5 Loosen nuts on adjuster bolts evenly and remove nuts, Belleville washers, adjuster rocker, and
gland follower.
4.1.6 Slide stem out through the inner side of the bonnet.
a CAUTION: Do not force stem out of bonnet as severe damage may result. Be careful not to
scratch the stem throughout disassembly. There is a washer present at the bottom of the stem.
NOTE: Stem has a shoulder which prevents blowout under pressure.
4.1.7 Remove o-ring cartridge, stem seals, metal washer and lipseal from bonnet taking care not to
scratch the bonnet bore surface.
4.1.8 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).
4.1.9 Carefully lift ball and seats upward by pushing down on the screwdriver until they can be
removed by hand.
NOTE: Avoid marring bonnet gasket surfaces and ball surfaces
4.1.10. Clean and inspect all parts for wear or damage. Pay particular attention to gasket and seating
surfaces, ball surface, travel stop and soft parts.