SEA MK / LV2 Technical Manual
6
9.
Remove the back-up ring (24), o-ring (25), brass washer
(26) and Teflon washer (27) from the stem (28).
Check Bonnet
NOTE: It is possible that some or all of these parts have
remained in the bonnet (21).
10.
Remove the o-ring (23)
from the bonnet (21).
11.
Insert the squared end of
the stem (28) into the seat &
disc retainer (29) and unscrew
it from the first stage body (8).
13.
Remove the pressure gauge (36) using a 7/8” crowfoot
and flex wrench. Remove o-ring (32) from the pressure gauge.
Crown
12.
Using a magnifier, inspect
the condition of the seat &
disc retainer crown inside the
first stage body (8). There
should be no scratches, nicks
or dents on the crown seating
surface.
CAUTION:
Be careful not to damage the fill port (33) with
the wrench while removing the pressure gauge (36).
8.
Using the 3/4" socket and flex wrench, unscrew the bonnet
(21) from the first stage body (8). Pull the stem assembly out
of the bonnet.
7.
Unscrew the handwheel retainer (15) using the modified
screwdriver. Remove the handwheel washer (16), spring (17)
handwheel (18), nylon washer (19) and indicator ring (20)
from the stem (28).
Disassembly of Handwheel
NOTE: SEA units will either have a dial pressure gauge
(36) or pin style pressure gauge (37). Identify which
type the SEA being serviced utilizes and follow the
instructions accordingly.
Disassembly of Dial Pressure Gauge
Disassembly of Pin Style Pressure Gauge
14.
Use the valve handle retainer tool to remove the pin
pressure indicator (37) from the first stage body (8). Remove
o-ring (32) from the pressure indicator body (38).
