Fisher Design ED series Instruction Manual page 18

Design ED & EAD Class 125-600
12B4182-A
9.5 mm
(3/8 INCH) STEM
FOR S31603 (316 SST) PACKING
A5885 / IL
12B4183-A
9.5 mm
(3/8 INCH)
STEM
A5886 / IL
Figure 12. PTFE Packing Arrangement for Use in ENVIRO-SEAL Bellows Seal Bonnets
The ENVIRO-SEAL stem/bellows
assembly for Design E valves is
available only with a threaded and
pinned plug/adaptor/stem connection.
The existing valve plug can be reused
with the new stem/bellows assembly or a
new plug can be installed. If the existing
valve plug is reused, and the adaptor is
in good condition, it may be reused also.
However, never reuse an old adaptor
18
THRUST
RING (KEY 39)
SPRING
(KEY 8)
THRUST
RING
12B4185-A SHT 1
(KEY 39)
12.7 mm
(1/2 INCH)
STEM
BOX PARTS
SINGLE ARRANGEMENTS
BUSHING
(KEY 13)
THRUST
RING
(KEY 39)
18A0906-C
12.7 mm
(1/2 INCH)
STEM, 2 INCH
VALVES
DOUBLE ARRANGEMENTS
Note
SPACER
(KEY 8)
12B4182-A SHT 2 12B4185-A SHT 2
9.5 mm 12.7 mm
(3/8 INCH) (1/2 INCH)
STEM STEM
FOR ALL PACKING BOX MATERIALS
EXCEPT S31603
BUSHING
(KEY 13)
SPACER
(KEY 8)
18A5338-A
12.7 mm
(1/2 INCH)
STEM, 3 AND 4 INCH
VALVES
with a new valve plug. Using an old
adaptor with a new valve plug requires
drilling a new pin hole in the adaptor.
This drilling weakens the adaptor and
may cause failure in service. However, a
used valve plug may be reused with a
new adaptor.
3. Inspect the existing valve plug and adaptor. If they
are in good condition, they can be reused with the new
stem/bellows assembly and they do not need to be
separated.
UPPER WIPER
(KEY 12)
BUSHING
(KEY 13)
FEMALE ADAPTOR
PACKING RING
PACKING SET
MALE ADAPTOR
(KEY 6)
SPACER (KEY 8)
SPACER (KEY 8)
UPPER WIPER
(KEY 12)
BUSHING
(KEY 13)
FEMALE ADAPTOR
PACKING SET
(KEY 6)
PACKING RING
MALE ADAPTOR
SPACER (KEY 8)