Instruction Manual
D101642X012
ENVIRO-SEAL Sliding-Stem Valves
July 2017
5
Remove old packing parts from the packing box by using the valve instruction manual procedures. Both the valve stem
surface condition and the packing bore are critical in obtaining a good seal. If the valve stem surface is scratched,
nicked, or worn, replace the valve stem before installing the ENVIRO-SEAL Packing System. Check the condition of the
packing bore and clean or hone it out, as necessary. Refer to the appropriate valve instruction manual to replace the
valve stem.
Figure 4. Belleville Spring Stacking Order
7 SPRINGS
PACKING
FOLLOWER
9 SPRINGS
PACKING
FOLLOWER
easy-e PTFE & DUPLEX
PACKING
easy-e GRAPHITE ULF
PACKING
A6144
Table 4. Packing Friction with ENVIRO-SEAL PTFE Packing
VALVE STEM DIAMETER PTFE PACKING
mm Inches Newtons Pounds (Force)
9.5
12.7
19.1
25.4
31.8
50.8
3/8
1/2
3/4
1
1-1/4
2
555
755
1110
1515
1890
3220
125
170
250
340
425
725
Table 5. Packing Friction with ENVIRO-SEAL Duplex Packing
VALVE STEM DIAMETER DUPLEX PACKING
mm Inches Newtons Pounds (Force)
9.5
12.7
19.1
25.4
31.8
50.8
3/8
1/2
3/4
1
1-1/4
2
555
755
1110
1515
1890
3220
125
170
250
340
425
725
Table 6. Packing Friction with ENVIRO-SEAL Graphite ULF Packing
VALVE STEM DIAMETER GRAPHITE ULF PACKING
mm Inches Newtons Pounds (Force)
9.5
12.7
19.1
25.4
31.8
50.8
3/8
1/2
3/4
1
1-1/4
2
935
1250
2350
3740
4800
6000
210
280
530
840
1100
1350
For key number locations refer to figures 5, 6, or 7. Then proceed as follows:
1. The original packing flange studs used for standard packing arrangements should be long enough to accommodate
the retrofit kit parts. If you determine that the existing studs and nuts should be replaced however, due to their
condition, replace them with the studs and nuts (keys 200 and 212) supplied in the retrofit kit.
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