Emerson KGA User Manual

7
CLARKSON SLURRY KNIFE GATE VALVES
KGA+
7 SPARE PARTS
With the update to the KGA+, it is important
to understand the impact on spare parts and
interchangeability with the prior design. When
ordering spare parts, keep in mind the new
KGA+ uses the ‘plus’ sign as part of the model
code. This will allow quick identification to
assure proper spares are provided.
If tag is missing or unreadable, there are
several exterior clues to tell the difference
(refer to Figure 6):
KGA+: At the top of the valve housing, the
secondary seal retainer is a single
pieceand goes all-around the gate.
KGA: At the top of the valve housing, in place
of the secondary seal retainer, the KGA
has a wiper retainer. This is a two piece
assembly and the wiper (black plastic)
isvisible.
1. Encapsulated sleeves: no changes, 100%
interchangeability with all sizes.
2. Gates: to accommodate the new secondary
seal, gates have been redesigned for sizes
NPS 3 - 16 (DN 80 - 400). New gates for the
KGA+ sizes NPS 3 - 16 (DN 80 - 400) are
not interchangeable with the prior design
KGA and older gates will not fit the KGA+.
As a result, peripheral parts including gate
clevises, stem assemblies are also impacted
and not interchangeable in thesesizes.
3. Retainer flanges: no changes, 100%
interchangeability with all sizes.
4. Housings: all sizes have been redesigned to
accommodate the secondary seal, full face
flanges and spacer bar elimination. They are
not interchangeable with older housings.
Materials of construction remain the same.
5. Frames (yokes): no changes, 100%
interchangeability with all sizes excluding
special heavy duty designs.
6. Stem nut assembly: no changes, 100%
interchangeability with all sizes.
7. Handwheel: no changes, 100%
interchangeability with all sizes.
8. Stem nut base: no changes, 100%
interchangeability with all sizes.
Secondary seal retainer
Wiper
retainers
Wiper
KGA+, secondary seal retainer is a single piece,
goes all-around the gate, no spacer bar.
KGA, wiper retainer is two piece, wiper (black
plastic) is visible. Spacer bar is also visible.
FIGURE 7
Spacer bar
Secondary seal
FIGURE 6
Sleeve
9. Stem assembly: as noted above,
due to the gate redesign on sizes
NPS3 - 16 (DN80-400), stems are not
interchangeable. Sizes above NPS 16
(DN400) are 100% interchangeable.
10. Secondary seal: a wiper assembly is
standard on the KGA, the KGA+ uses
a secondary seal assembly, the two
assemblies are not interchangeable
between the two valve types.
11. Actuation: no changes have been
made to the AC or HC actuators, 100%
interchangeability. The clevis assembly
(gate to cylinder rod connection) has been
changed for sizes NPS 3 - 16 (DN 80 - 400)
and is not interchangeable. The BG actuator
remains the same; however, the stem
has been revised in sizes NPS 3 - 16
(DN 80 - 400) so it is not interchangeable
with prior designs.
Recommended spare parts (see Figure 7)
Valves:
2-replacement sleeves
1-replacement secondary seal
Cylinder operator (if applicable):
1-repair kit
1. When ordering replacement parts for a
Clarkson product or cylinder operator,
please include valve or cylinder size and
complete description including serial
number with your request.
2. Additional replacement parts such as
handwheels, stem nut assemblies,
retainers, frames (yoke), stems and gates
are available from factory. Again, please
provide complete description with serial
number when ordering.
3. Spare sleeve storage: molded elastomer
sleeves have a practical recommended
shelf-life. Genuine Clarkson sleeves are
laser etched on the outside surface with
date of manufacture to use in calculating
estimated shelf-life.
• Natural rubber - 2 years
• EPDM - 4 years
• NBR/HNBR - 4 years
Contact factory for additional elastomers.

Emerson KGA Specifications

General

Brand	Emerson
Model	KGA
Category	Control Unit
Language	English