EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
5
Figure 2. Single PTFE V-Ring Packing Arrangement
12A7837-A
A6745/IL
D
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
CAUTION
Follow instructions carefully to avoid
damaging the product surfaces, which
could result in damage to the product.
Note
Whenever a gasket seal is disturbed
by removing or shifting parts, a new
gasket should be installed upon
reassembly. This is necessary to
ensure a good gasket seal since the
used gasket may not seal properly.
Packing Maintenance
This section covers PTFE V-ring, double PTFE, and
graphite packing used in extension bonnets
(figures 2, 3, and 4).
Note
If the valve has ENVIRO-SEAL
live-loaded packing installed, refer to
the instruction manual ENVIRO-SEAL
Packing System for Sliding Stem
Valves, Form 5306, for packing
instructions. Figure 6 shows typical
ENVIRO-SEAL arrangements.
Figure 3. Double PTFE V-Ring Packing Arrangements
A6746/IL
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1-1/4 INCH)
STEM
Figure 4. Graphite Ribbon/Filament Packing Arrangements
A6747/IL
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1-1/4 INCH)
STEM
0.102 mm (0.004 INCH)
Standard packing key numbers are shown in figures
2, 3, and 4. ENVIRO-SEAL packing key numbers
are shown in figure 6. Bonnet key number locations
are shown in figure 7, and valve key numbers are
shown in figures 8 and 9.
For spring-loaded single PTFE V-ring packing, the
spring (key 8) maintains a sealing force on the
packing. If leakage is noted around the packing
follower (key 13), 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 5), until the shoulder is