Fisher EWS Series Instruction Manual page 23

Instruction Manual
Form 2376
March 2007
12B4182–A/IL
9.5 mm
A5855/IL
(3/8 INCH)
STEM
FOR S31603 (316 SST) PACKING
12B4183–A/IL
9.5 mm
(3/8 INCH)
STEM
A5886–1/IL
Figure 15. PTFE Packing Arrangement for Use in ENVIRO-SEALr Bellows Seal Bonnets
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 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.
THRUST
RING
(KEY 39)
SPRING
(KEY 8)
THRUST
RING
12B4185–A–SHT1/IL 12B4182–A–SHT2/IL
(KEY 39)
12.7 mm
(1/2 INCH) (3/8 INCH)
STEM
BOX PARTS
SINGLE ARRANGEMENTS
BUSHING
(KEY 13)
THRUST
RING
(KEY 39)
18A0906–D/IL
12.7 mm
(1/2 INCH)
STEM, NPS 2
VALVES
DOUBLE ARRANGEMENTS
SPACER
(KEY 8)
12B4185–A–SHT2/IL
9.5 mm 12.7 mm
(1/2 INCH)
STEM STEM
FOR ALL PACKING BOX MATERIALS
EXCEPT S31603
BUSHING
(KEY 13)
SPACER
(KEY 8)
18A5338–B/IL
12.7 mm
(1/2 INCH)
STEM, NPS 3 AND
NPS 4 VALVES
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.
When removing/installing a valve plug
on the ENVIRO-SEAL stem/bellows
EW Valve
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
PACKING RING
(KEY 6)
MALE ADAPTOR
SPACER (KEY 8)
CAUTION
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