Emerson Yarway 9200 Series Manual de usuario
YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"
InstallatIon and maIntenance InstructIons
Before installation these instructions must be fully read and understood
© 2017 Emerson. All Rights Reserved.valves.emerson.com VCIOM-03341-EN 17/05
Engineering doc. #972562 Rev. A
OPERATION
Flow through the check valve overcomes the
spring force to open the main check valve
element. When the disc lifts in response to
an increase in main flow, the bypass flow is
decreased as the port openings in the disc stem
begin to close. Conversely, as the pump flow is
reduced, the check disc moves downward and
at a designated point starts to uncover the disc
stem ports allowing bypass flow to begin.
The sizing of the main check/trim is such that
the bypass flow starts before the main flow
drops below the minimum pump flow specified.
The combined main and bypass flows provide
a total greater than the minimum pump flow
requirement.
Bypass flow enters the disc stem passage
through the slots and the round ports and
around the annulus in the bypass bushing. It
then continues through the bypass where the
helix element conditions the flow at the valve
bypass outlet. The recirculation flow rate is
controlled by the disc slot sizing. Occasionally
higher pressure applications may require the
use of a Back Pressure Regulator (BPR) in the
bypass line for proper pressure letdown.
GENERAL
These sizes in the 9200 ARC®(Automatic
Recirculation Control) valve series are designed
to provide protection for low to moderate
pressure (ASME/ANSI 150 and 300 Class)
centrifugal pumps against overheating and
possible unstable operation during low load
periods. The valve functions simultaneously
as (1) a check valve - to prevent reverse flow
through the pump and as (2) a bypass control
valve - to maintain the minimum required
pump flow and provide pressure letdown.
2
YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"
InstallatIon and maIntenance InstructIons
FIGURE 1
3 diameters straight pipe
minimum recommended
atvalve outlet
Receiver vessel
Shut off valve
Bypass flow
Long radius pipe
bends typical
Optional
checkvalve
5 diameters straight pipe minimum
recommended at valve inlet
From pump
BPR
if required
Main flow
To process
OPERATIONAL CHECK
When the valve is properly installed the
combined main and bypass flows should equal
or exceed that of the specified minimum pump
flow. If operational checks indicate a deviation
from the original specifications and field
adjustments are necessary, contact Yarway
for additional information.
INSTALLATION (REFER TO FIGURE 1)
The 9200 Series valve is sized and configured
based on specifications provided by the user.
Make certain that these conditions are still
applicable. Changes in pressure, temperature,
normal main flow and minimum flow
requirements could result in unsatisfactory
performance. If operating conditions have
changed, contact Yarway; modifications
mayberequired prior to installation.
Remove all packing material. Place the valve
on wooden blocks with the flow arrow pointed
down. Push the disc from its seat and flush
away any packing materials with compressed
air or high pressure water. The disc should
move freely (against the spring load) through
the entire stroke length until contacting the
upper stop. This may not be practical on
larger sizes.
The valve may be installed with the main flow
direction either horizontal or vertically up.
Thedirection of bypass flow may be selected
tosuit the installation.
VALVE MAINTENANCE
Except for periodic operational checks the
valve requires little maintenance. The disc
assembly, spring, bypass bushing and flow
conditioner should be inspected coincident
withother annual inspections. Make certain
that all pressure is relieved and the pipeline
is securedagainst pressurization before
attempting disassembly for inspection
purposes.
3
YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"
InstallatIon and maIntenance InstructIons
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
forrepair.
7. If the flow conditioner (5) shows excessive
wear it can be removed by pencil grinding
the tack welds and lifting the worn part
fromthe body (1). A replacement flow
conditioner can then be installed and
re-tack welded in place using ER-309
weldwire.
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
theholes 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
tosupport valve weight. Lift these valves using
eyehooks in the tapped holes provided for the
flanged connection.
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
orexcessive 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
180grit (medium-coarse) followed by
360grit (fine). The finished surface should
be 360 degrees and a minimum of ½ the
available seat width. Clean thoroughly
aftereach lapping operation.
REASSEMBLY (REFER TO FIGURE 2)
Reassemble the valve by reversing the above
disassembly procedure taking care not to
damage the snubber seal when lowering
theupper stop into the disc.
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
orsheartheseals during installation.
Supply the following information when
orderingspare parts:
(1) Figure number
(2) Serial number
(3) Type of fluid
4
1/4 [6.4]
C
±1/8 [±3.2]
B
±1/16 [±1.6]
A
±1/16 [±1.6]
2 (50) 150 4¼ (108.4) 4¾ (120.7) 11 (279.4) 1½ (40) 42 (19.0)
300 48 (20.9)
3 (80) 150 4¾ (120.7) 5¾ (146.1) 13¾ (349.3) 2(50) 73 (33.1)
300 81 (36.7)
4 (100) 150 5½ (139.7) 7¾ (196.9) 17¾ (450.9) 3 (80) 125 (57.2)
300 147 (66.7)
YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"
InstallatIon and maIntenance InstructIons
FIGURE 2
DIMENSIONS AND WEIGHTS
Valve size
Class ANSI
Dimensions, inch (DN) Bypass flange size Weight
inch (DN) A B C inch (DN) lb (kg)
PARTS LIST
Item Part Material
1Body ASTM A-216 Grade WCB
with ASTM A747
Grade CB7Cu-1 (17-4
PH Cast) ConditionH900
(J92180) seat ring
2Upper stop ASTM A216 WCB
3Orifice 18-8
4[2] Disc assembly ASTM A351 type CF8M
5Flow conditioner ASTM A351 type CF8M
6Bypass bushing ASTM A747 Grade
CB7Cu-1 (17-4 PH Cast)
Condition H900 (J92180)
7[2] Spring AISI 316 stainless steel
8[1][2] Gasket Sigraflex BP (Graphite)
9[1][2] Snubber seal Variseal - Carbon
filled TFE
10 Screw AISI 316 stainless steel
11[1][2] Snubber ring ASTM A276-S21800A
(Nitronic 60 bar)
12[1][2] Spiral ring PH15-7MO
13[1][2] Snubber washer AISI 316 stainless steel
14 Nameplate AISI 300 series stainless
steel
NOTES
1. Recommended spare parts for service inspection.
2. Recommended spare parts for service overhaul.
Este manual sirve para los siguientes modelos
1
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