Adding Packing Rings - Emerson Fisher HS Instruction Manual

HS Valve
June 2019

Adding Packing Rings

This section covers adding packing rings to PTFE V-ring, PTFE/composition, and graphite/ribbon packing as used in
standard and radiation bonnets. PTFE V-ring packing is shown in figure 3, PTFE/composition packing is shown if figure
4, and graphite/ribbon packing is shown in figure 5. When using packing with a lantern ring (key 8, figure 3, 4, or 5), it
is possible to add packing rings above the lantern ring as a temporary measure without removing the actuator from
the valve.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve, and drain the process
media from both sides of the valve. Use lock-out procedures to be sure that the above measures stay in effect while
you work on the equipment.
2. Remove the packing flange nuts and lift the packing flange and follower away from the valve.
3. Avoid scratching the valve stem or packing box wall as the old packing rings are removed from on top of the lantern
ring. Clean all metal parts to remove particles that would prevent the packing from sealing.
I
4. nstall packing rings.
If split-ring packing is being added, spread the rings over the stem and slide the rings into the packing box.
Alternate the positions of the splits to avoid creating a leak path.
If solid-ring packing is being added, remove the stem connector and slip the rings over the end of the valve stem.
5. Replace the packing flange and packing follower. Tighten the packing flange nuts only far enough to stop leakage
under operating conditions.
6. If the valve-actuator stem connection was taken apart, reconnect according to the appropriate actuator instruction
manual.
7. Check for leakage around the packing follower when the valve is being put into service. Retighten the packing
flange nuts as required.
Figure 5. Detail of PTFE/Composition Packing Arrangements for Standard and Radiation Bonnets
6
3/4, 1, OR
1/2 INCH
3/8 INCH
1‐1/4 INCH
(12.7 mm)
(9.5 mm)
(19.1, 25.4, OR
STEM
STEM
31.8 mm) STEM
TYPICAL (DOUBLE) ARRANGEMENTS
Instruction Manual
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX
RING (KEY 11)
D100381X012