Emerson Yarway 9200 Series Instruções de instalação e manutenção - Página 3
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YarwaY 9200 SerieS ArC
InstallatIon and maIntenance InstructIons
DIsassEMblY aND INspECtION
(rEfEr tO fIGurE 2)
1. remove the valve from the line and orient
the main vertically up.
2. evenly unfasten the upper stop jacking
screws (10) relieving spring compression
until the upper stop is free. remove the
upper stop, inspect and replace gasket (8)
and snubber seal (9).
3. remove the spring (7) and inspect for
damage.
4. lift the disc assembly until it clears the
valve body. inspect the disc stem, slot
surfaces and snubber seal (9) for damage
or excessive wear.
Note: if substantial flow and pressure
related damage is found on the disc, special
attention should also be given to the bypass
bushing during inspection to assure it is
undamaged.
5. examine the check valve seat for evidence
of wear. This surface can be reconditioned
by lapping the disc to the body. First use
180 grit (medium-coarse) followed by
360 grit (fine). The finished surface should
be 360 degrees and a minimum of ½ the
available seat width. Clean thoroughly
after each lapping operation.
6. The bypass bushing (6) is press fitted
in place. This is not considered a field
replaceable component. if excessive wear
is apparent, please consult with factory
for repair.
7. if the flow conditioner (5) shows excessive
wear it can be removed by pencil grinding
the tack welds and lifting the worn part
from the body (1). A replacement flow
conditioner can then be installed and
re-tack welded in place using er-309
weld wire.
VAlVeS 2", 3" And 4"
®
inspect the condition of all the sealing
surfaces. it is recommended that all O-rings
and seals be replaced at each disassembly.
use an appropriate O-ring lube for the
specified elastomer taking care not to pinch
or shear the seals during installation.
Supply the following information when
ordering spare parts:
(1) Figure number
(2) Serial number
(3) Type of fluid
rEassEMblY (rEfEr tO fIGurE 2)
reassemble the valve by reversing the above
disassembly procedure taking care not to
damage the snubber seal when lowering
the upper stop into the disc.
CautION
Do not attempt to lift these valves using a strap
or chains around the webs on the upper stop (2).
These screws (19) will not support the valve
weight. Lift these valves using eye hooks in
the holes provided for the flanged connection.
If it becomes necessary to handle this valve
from the bypass side, do not attempt to lift these
valves using a strap through the helix on the flow
conditioner (5). The tack welds are not intended
to support valve weight. Lift these valves using
eye hooks in the tapped holes provided for the
flanged connection.
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