Fisher Design ED series Instruction Manual page 6

Design ED & EAD Class 125-600
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER
(KEY 13)
WASHER
(KEY 10)
SPRING
(KEY 8)
PACKING BOX
RING (KEY 11)
FOR 316 OR 17-4PH SST
METAL PACKING BOX PARTS
12A7837-A
12A8187-C
ASSEMBLY 1 ASSEMBLY 2 ASSEMBLY 3
(POSITIVE (VACUUM) (POSITIVE
PRESSURES) PRESSURES
& VACUUM)
9.5 mm (3/8 INCH) STEM
NOTES:
1 MALE ADAPTOR, PACKING RING, FEMALE ADAPTOR,
AND LOWER WIPER ARE PART OF PACKING SET (KEY 6).
2 REQ'D FOR DOUBLE ARRANGEMENTS, EXCEPT LOWER WIPER.
C0783 / IL
4. Hex nuts (key 16, figure 19, 20, or 21) or cap
screws (not shown) attach the bonnet (key 1, figure
18) to the valve body (key 1, figure 19, 20, or 21).
Loosen these nuts or cap screws approximately 3 mm
(1/8 inch). Then loosen the body-to-bonnet gasketed
joint by either rocking the bonnet or prying between
the bonnet and valve. Work the prying tool around the
bonnet until the bonnet loosens. If no fluid leaks from
the joint, remove the nuts or cap screws completely
and carefully lift the bonnet off the valve.
5. Remove the locknut and separate the valve plug
and stem from the bonnet. Set the parts on a
protective surface to prevent damage to gasket or
seating surfaces.
6
FEMALE
ADAPTOR
PACKING RING
MALE
ADAPTOR
LOWER WIPER
SINGLE ARRANGEMENTS
12A7814-C
ASSEMBLY 1 ASSEMBLY 2
(POSITIVE (VACUUM)
PRESSURES)
12.7 mm (1/2 INCH) STEM
DOUBLE ARRANGEMENTS
Figure 3. PTFE V-Ring Packing Arrangements for Plain or Extension Bonnets
FEMALE
1
1 ADAPTOR
1
1 PACKING RING
MALE
1 1 ADAPTOR
LOWER
1
WIPER
1
FOR ALL OTHER METAL PACKING
12A7839-A
ASSEMBLY 3 ASSEMBLY 1 ASSEMBLY 2
(POSITIVE (POSITIVE (VACUUM)
PRESSURES PRESSURES)
& VACUUM)
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1 1/4 INCH) STEM
6. Remove the bonnet gasket (key 10, figure 19, 20,
or 21) and cover the opening in the valve to protect the
gasket surface and prevent foreign material from
getting into the valve body cavity.
7. Remove the packing flange nuts, packing flange,
upper wiper, and packing follower (keys 5, 3, 12, and
13, figure 18). Carefully push out all the remaining
packing parts from the valve side of the bonnet using a
rounded rod or other tool that will not scratch the
packing box wall. Clean the packing box and the metal
packing parts.
8. Inspect the valve stem threads and packing box
surfaces for any sharp edges which might cut the
packing. Scratches or burrs could cause packing box
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER
(KEY 13)
SPACER (KEY 8)
PACKING BOX
RING (KEY 11)
BOX PART MATERIALS
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
MALE
ADAPTOR
PACKING RING (KEY 7)
FEMALE
ADAPTOR
LANTERN
RING
(KEY 8)
1
PACKING BOX
RING (KEY 11)
LOW-
ASSEMBLY 3
ER
(POSITIVE
PRESSURES
WIPER
& VACUUM)
1
1
1
1