Lantern Rings; Lubrication Fittings And Purge Connectors; Seal Maintenance - Fisher A11 Instruction Manual

A11 Valve
BACK-UP
RING
SEAL RING
RETAINING
RING
RETAINING
RING
NOVEX METAL SEAL
NOTES:
1
THIS UNIDIRECTIONAL SEAL MUST BE INSTALLED SO THAT THE RETAINING
RING IS DOWNSTREAM FROM THE HIGH PRESSURE SIDE OF THE VALVE AT
SHUTOFF, AS SHOWN.
2
FOR THIS BIDIRECTIONAL SEAL, THE "PREFERRED" VALVE ORIENTATION
PLACES THE RETAINING RING DOWNSTREAM FROM THE HIGH PRESSURE SIDE
OF THE VALVE AT SHUTOFF.
E0578 / IL
3. Before installing new packing, clean the packing
bore.
4. Install new packing one ring at a time, using the
packing follower as a driver. If split packing is used,
stagger seams every 90_.
5. Reinstall the packing follower and packing flange,
secure nuts, and tighten as needed.

Lantern Rings

Valves only have lantern rings if they are provided
with purge fittings or lubrication fittings. Lantern rings
are located either at the bottom of the packing or
central packing area as noted in figure 8.
Lubrication Fittings and Purge
Connectors
These connections and/or fittings are located on the
lower gasket retainer and packing area of valve
10
BODY
HIGH PRESSURE
AT SHUTOFF
VALVE DISC
SOFT SEAL WITH
BACK‐UP O‐RING
BODY
VALVE DISC
HIGH PRESSURE
AT SHUTOFF
GRAPHITE
GASKET
LARGEST
BACK-UP
OUTSIDE
RING
DIAMETER
2
LARGEST GRAPHITE
OUTSIDE GASKET
DIAMETER
RETAINING
RING
METAL
SEAL
RING
1
Figure 5. Seals
bodies. They are normally either 1/8 inch NPT or 1/4
inch NPT.

Seal Maintenance

1. After the valve has been removed from the line
and the manual or power actuator has been
removed, manually rotate the shaft (key 4)
counter-clockwise until the disc has moved a
full 180_. Note that the "S" on the shaft is 180_ from
the "S" on the valve body.
2. Lay the valve flat on a work bench in a secure
position with the retaining ring (key 2) and retaining
ring screws (key 22) facing up. Use blocks or other
appropriate techniques to support the valve.
Remove all retaining ring screws.
3. Remove the retaining ring by placing a retaining
ring screw in each of the two retaining ring jack
screw holes. With the appropriate tool, slowly rotate
the screws until the retaining ring has been lifted
from the valve body.
BODY
LARGEST
OUTSIDE
DIAMETER
METAL
SEAL
RING
RESILIENT
INSERT
VALVE DISC
HIGH PRESSURE
AT SHUTOFF
PHOENIX III
FIRE‐SAFE SEAL
BODY
LARGEST
OUTSIDE
DIAMETER
CRYOGENIC
SEAL RING
HIGH PRESSURE
VALVE DISC
AT SHUTOFF
CRYOGENIC SEAL
1
1