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Clarkson Slurry Knife Gate ValVeS
KGA
8. install the retainer bolts. Only tighten
sufficiently to allow installation of the
next bolt. Continue this until all bolts
are installed.
9. Once all bolts are in place, tighten the
retainer flange bolts using a cross pattern
until there is a 0" - ⅛" (0 - 3 mm) gap
between the retainer flange and the
housing. Do not cycle valve with only
one sleeve in place.
10. turn the valve over so the installed sleeve
is on the flat surface.
11. apply a silicone base lubricant to the
sealing-nose radius of the installed sleeve.
also apply it to the second sleeve sealing
nose and O.D. of seal end.
12. install the second sleeve, following steps
1 through 11. it may be necessary to use two
or more C-clamps to pull down the second
retainer flange. Do not fully tighten retainer
flange bolts until after checking the sleeve
bores for concentricity; using a straight
edge, check the sleeve position in four (4)
places, 90 degrees apart in relation to the
installed sleeve bore i.D. adjust as required
to make the sleeve concentric with the
other sleeve.
13. fully tighten retainer flange bolts per
Paragraph 9.
14. remove C-clamps, if used.
15. the valve is now ready for installation.
Keep gate in the open position until valve
is installed.
note: certified Clarkson elastomer parts from
emerson are laser-etched with part number,
date of manufacture, the Clarkson brand
name and other appropriate information to
assure you have a genuine Clarkson part. the
use of non-OeM parts will void any remaining
warranty.
29 Wiper replaCeMent
Caution
Since this procedure may be performed with the
valve in an active pipeline, plant standard safety
procedures must be followed. Use of personal
protective equipment, tag out or other plant
standard safety procedures must be followed.
Procedure SHOULD NOT be done with valve in
closed position. If valve is removed for this service,
assure line is not pressurized before removing
valve. Valve assembly and parts may be heavy,
use proper lifting and support techniques, refer
to Lifting, Section 33.
disassembly
1. replacement of the wiper assembly can be
accomplished without having to remove the
valve from service, however, this procedure
SHOulD nOt be done with valve in closed
position. if it is suspected that either one or
both of the elastomer sleeves have failed,
the valve should be removed from service
before wiper assembly removal. if valve is
to be removed, refer to lifting section.
2. Open the valve, so the gate is in the fully
raised position.
3. remove the wiper retainer mounting
screws, the retainer plates and wipers from
the housing.
4. examine wiper assembly parts for signs
of wear or cracking, severe abrasion or
chemical attack (softening or gumming).
replace if in doubt.
reassembly
1. if valve has been removed from pipe, lift
valve to vertical position, refer to the lifting
Section 33.
2. install wipers and wiper retainers on each
side of the gate.
30 disasseMbly and asseMbly
instruCtions
note: sizes nPS 8 (Dn 200) and below may
or may not have the optional retainer flanges.
retainer flanges are standard on sizes nPS 10
(Dn 250) and larger. larger diameter valves are
supplied with segmented (multipart) retainer
flanges. if your valve has segmented retainer
flanges, take note of the special sections.
Caution
Assure line is not pressurized before removing
valve. Valve assembly and parts may be heavy,
use proper lifting and support techniques. Refer
to Lifting, Section 33.
fiGure 10
for gate and or wiper replacement, smaller
valves may have the actuator frame swung out
of the way as illustrated here. remove frame
bolts on one side only and loosen the opposite
side just enough to allow movement. Be
sure and properly support weight of actuator
assembly, taking care to avoid injury.
Pivot frame
on bolt
28
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