8.11 Valve sizes DN 65 to DN 300 has a blind
bottom body. So the STEM (22) needs to
be pulled out from the top side of the valve.
After long or severe service this may take
considerable force. Be careful not to damag e
bearings, spacers or body.
NOTE: To make stem disassembly easier, the GLAND
RETAINER (140) can be inserted in reverse direction over
the stem with the counter bore facing towards the top
face of the STEM (22) and placing the RETAINING RING
(150) or SPLIT RINGS between the stem and gland retainer.
The gland retainer can then be pulled outwards which will
transfer the force to the stem through the retaining ring.
8.12 For Valve sizes DN 350 to DN 400 perform
the following steps.
8.12.1 Remove the BOTTOM PLATE NUTS (320),
BOTTOM PLATE (300), WAVE SPRING (280),
DISC SUPPORT (270) and GASKET (290) from
the bottom side of BODY (10).
8.12.2 Using a brass bar or drift punch, knock
STEM (22) loose and pull from BODY (10).
After long or severe service this may take
considerable force.
Be careful not to damage bearings, spacers or
body.
8.13 DISC SPACERS (70) are used at top and
bottom of DISC (21) to properly position disc
in BODY (10). Proper spacers were selected at
initial assembly and rarely require replacement.
The location of these spacers should be noted,
and the spacers marked at disassembly so that
they are reinstalled in the same positions, top
and bottom.
8.14 Separate BODY (10) from DISC (21), and
remove WASHER (110) from packing bore.
8.15 Examine BEARINGS (80) for excessive wear.
If removed from body, note position and mark to
reinstall in same location. If bearing liner is worn
through to the shell, or severe damage is evident
they should be replaced. Replacement is rarely
needed.
8.16 Clean BODY (10) thoroughly to remove all
dirt, foreign matter, rust, etc.
8.17 Place the BODY (10) flat, seat retainer side
up, and support it on wooden blocks sufficiently
above the work surface as to facilitate insertion
of the DISC (21) in open position.
8.18 Install the DISC SPACERS (70) in to the body
stem bore making sure that spacers are returned
to original locations as marked in step 8.13
8.19 Lower the disc into position, aligning the
bores in BODY (10) and DISC (21).
8.20 Insert new STEM (22) in BODY (10) with
large end of the taper pin holes toward the top.
8.21 Align taper pin holes in disc and stem, and
install TAPER PINS (23). Drive pins in tightly with
rod or punch, and tack weld each pin to DISC
(21) at large end of pin.
8.22 For Valve sizes DN 350 to DN 400 perform
the following steps.
8.22.1 Install new GASKET (290) in to the groove
on the bottom face of BODY (10).
Valve sizes DN 200 through DN 300 has an M6 tapped hole on the top face of the stem which can
be used to attach an eye bolt to pull out the stem.
