Emerson Yarway 9200 Series Manuale utente

YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"

InstallatIon and maIntenance InstructIons

Before installation these instructions must be fully read and understood

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.

YARWAY 9200 SERIES ARC®VALVES 2", 3" AND 4"

InstallatIon and maIntenance InstructIons

FIGURE 1

3 diameters straight pipe

minimum recommended

atvalve outlet

Receiver vessel

Shut off valve

Bypass flow

Long radius pipe

bends typical

Optional

checkvalve

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

mayberequired 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.

Thedirection of bypass flow may be selected

tosuit 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

withother annual inspections. Make certain

that all pressure is relieved and the pipeline

is securedagainst pressurization before

attempting disassembly for inspection

purposes.

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

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.

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.

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.

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.

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

1/4 [6.4]

±1/8 [±3.2]

±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) ConditionH900

(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.

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