Gasket Retainer; Bearing Maintenance - Fisher A11 Instruction Manual

Table 6. Torque Values for Fasteners
Fastener
NSm
Nominal Size
#10 4
1/4 9
5/16 19
3/8 33
7/16 53
1/2 80
9/16 117
5/8 161
3/4 286
7/8 447
1 651
1-1/8 837
CAUTION
In the following step, remove the disc
from the waterway side of the valve to
avoid damage to the disc or T-slot area
of the valve.
8. Remember: the disc must be removed from the
waterway side of the valve. Do not try to force the
disc through the seal side of the valve. This could
cause severe damage to the disc and T-slot area.
After removing the shaft, remove the disc.
Valve Shaft/Disc Pin Unit Installation
Replacement disc and shaft(s) are
provided as a matched set. When
replacing either the disc or shaft(s), a
matched set is required.
To replace the disc pin assembly (key 6), reverse
the removal steps used above.
InSlb FtSlb
35 - - -
81 - - -
167 - - -
295 - - -
- - - 39
- - - 59
- - - 86
- - - 119
- - - 211
- - - 330
- - - 480
- - - 617
Note
Before placing disc into a valve body, properly align
the top of the disc with the top of the valve. A "T" is
stamped on the disc to indicate alignment. Be sure
holes in the shaft are exactly aligned with the holes
in the disc before re-installing pins. After pins are
fully seated in the disc, use a punch or small chisel
to stake the pins at three points. This will prevent the
pins from working free and out of the disc due to
vibration.

Gasket Retainer

When two-piece shafts are used, a gasket retainer
assembly must be used. The gasket is held in place
by a gasket retainer and four hex head bolts and
lockwashers. When re-assembling the valve, this
gasket should always be replaced. Be sure the
gasket is centered over the shaft bore before
retightening bolts. Tighten down bolts evenly in a
cross over pattern or in a star pattern. Refer to table
6 for proper torque values.

Bearing Maintenance

Bearing Removal
To get access to the bearings (key 10), the disc and
shaft assembly (keys 3, 4 and 5) must be removed
from the valve. The bearings (key 10) may be
removed by using a brass drift punch and lightly
tapping them out. In valves without lower bonnets,
the lower bearing is removed by grasping it and
pulling upwards. Also, cryogenic valves have an
outboard bearing under the packing. Refer to the
Packing Maintenance section for instructions.
Bearing Installation
Before installation of the bearings, bearing bores
should be solvent cleaned and bearings will slip in.
A11 Valve
15