Packing Maintenance - Fisher Design CAV4 Instruction Manual

Design CAV4
Table 5. Recommended Torque for Packing Flange Nuts
STEM DIAMETER
mm Inch NSm
19.1 3/4 41
25.4 1 61
31.8 1-1/4 81
38.1 1-1/2 61
69.9 2-3/4 81
10A9421-A
AJ5428-D
A2160-2/IL
Figure 4. Optional Lubricator and Lubricator/Isolating Valve
cept the isolating valve must first be opened and then
closed after lubrication is completed.

Packing Maintenance

For spring-loaded single PTFE V-ring packing (figure
5), the spring (key 23) maintains a sealing force on the
packing. If leakage is noted around the packing follower
(key 22), check to be sure the shoulder on the packing
follower is touching the bonnet. If the shoulder is not
touching the bonnet, tighten the packing flange nuts
(key 15) until the shoulder is against the bonnet. If leak-
age cannot be stopped in this manner, replace the
packing as described in the Packing Replacement pro-
cedure.
For PTFE-composition or graphite ribbon/filament
packing (figure 5), leakage around the packing follower
may be stopped by tightening the packing flange nuts
(key 15). If leakage cannot be stopped by tightening
the nuts, replace packing as described in the Packing
Replacement procedure.
6
MINIMUM MAXIMUM
LbfSft NSm
30 61
45 91
60 122
45 91
60 122
LbfSft
45
67
90
67
90
12A7837-A
B1422-1*/IL
12A8173-A
31.8 mm (1-1/4-INCH) STEM
A2596-1/IL
14A7924-A
A2928-1/IL
GRAPHITE PACKING FOR 31.8, 38.1, & 69.9 mm
19.1 mm (3/4-INCH)
25.4 mm (1-INCH) OR
0.102mm (0.004 INCH)
(1-1/4, 1-1/2, & 2-3/4 INCH) STEM DIA
Figure 5. Packing Arrangements