A self-contained system, the 7100 Series ARC valve has a ... · Flow meter FIC Pump Pump Automatic recirculation valve Remote back pressure regulator (optional) ... Dimensions are

Yarway 7100 Series ARC® Valve For Centrifugal Pump Protection

Copyright © 2013 Pentair. All rights reserved. YAWMC-0418-US-0909www.pentair.com/valves

The 7100 Series ARC® is made tooperate in a low flow condition forextended periods without damage to the valve or bypass piping system.The need is no longer just for emergency,short duration shut down, but forextended operation at low flows.

Our check and bypass/pressureletdown elements are specificallydesigned to operate under thesedifficult conditions. There is no need

for an auxiliary manual by-pass systemwhich only serves to negate theadvantage of an automatic system.

The design of the 7100 Series ARC®

is the result of 27 years of experienceand over nine thousand ARC® valves inservice. And to help ensure every valveworks properly, functional tests areperformed and the valves are thencertified for the application.

General DescriptionThe 7100 Series ARC® Valve has beenspecifically designed and manufacturedto meet the demands and operatingphilosophies of today’s high pressurecentrifugal pumps. Many power plantsare now operating under peaking orthrottled conditions, which in turnrequires the pumps to operate at lessthan their optimal design and performancelevels. As a result, they are subject toserious damage from hydraulic,mechanical and/or thermal abnormalities.

The 7100 Series ARC® provides the mosteconomical and reliable system to protectpumps from the dangers of low and/orreverse flow. It combines the functions of a check valve, flow sensing device,minimum flow control and pressureletdown into a single valve. The ARC®

valve requires no external use of powerand installs easily with only threeconnections. By eliminating at leastseven major interdependent components,that ordinarily would be necessary toprovide this protection, we have not onlysimplified the system, but made it muchmore reliable.

Our quest for ensured pump flow protectiondoes not, however, end at just providingthe hardware. We analyze the completepumping system and piping. Very oftenthe application’s fluid hydraulics anddynamics compromise the effectivenessof the protection system. A thoroughanalysis of conditions up and downstreamof both the pump and ARC® valve willprovide us with solutions to “reliable”protection... things such as 1) properpressure throughout the complete bypass piping to prevent any level offlashing or cavitation; (a condition that is prevalent in all pressure breakdownsystems); 2) improved bypass manifoldarrangements; 3) good piping layoutsthat promote stable operation; 4) stableand reliable interaction of pump andvalve at less than optimal conditions of operation.

A self-contained system, the 7100 Series ARC® valve has a pressure reducing trim and is in-line repairable.


Copyright © 2013 Pentair. All rights reserved. YAWMC-04182

7100 Series ARC® (ANSI Class 900-1500)

Bypass

BypassOutlet Inlet

Multi-stage pressure letdown

Piloted bypass piston positioningExternal bypass flow adjustment

Separate tight shut offsealing surfaces

Bypass flow control

Flow sensing element

Check valve preventsreverse flow back into pump

Vortex flow development

Features and BenefitsSelf-contained valve provides thefunctions of: Check valve, flow sensingelement, bypass flow control valve andmulti stage pressure letdown device.

• Simplifies the system.

• Reduces cost of Engineering,Administration, Installation andMaintenance of complex,conventional flow control valve and instrument systems.

• Eliminates requirement for external source of power and/or instrument signals.

One valve replaces seveninterdependent components• Eliminates multi vendor responsibilityand coordination.

• Enhances system reliability.

Patented bypass flow control andpressure letdown system• Helps ensure fail safe operation andpump flow protection.

• Eliminates cavitation, flashing, chokedflow and/or damage in bypass line.

Complete in-line accessibility• Allows for adjustment, inspectionand/or maintenance of all internalswithout removing the valve from theline or disrupting any piping.

Field adjustability• Enables user to change main flow,bypass flow and switch point.

• Accommodates changes in pump operation.

True bypass flow modulation• Help ensure proper minimum pumpflow.

• Provides a smooth transition frommain flow to bypass flow, thuseliminating piping shock.

• Conserves energy.

Valves are completely functionaltested• Valve is certified correct for its application.

• Helps ensure reliable performancefrom every valve.

One Valve – Four Functions• Check valve – prevents reverse flow.

• Instrumentation – flow sensing andbypass activation.

• Bypass flow control – helps ensureminimum pump flow.

• Pressure letdown – reduces pressureof fluid returning to its sources.

Bypass activation andswitchpoint adjustment



ARC® system simplifiesinstallation:• One piece to be installed

• Only three connections

• Eliminates at least seven welds

• No electric or air supply lines to install

• No instrumentation hook up orcalibration

• No special piping requirements

ARC® system increases reliability:• Specifically designed for fail safe operation

• Fewer moving parts cuts down failure potential

• No external source of power to jeopardize operation

• Single vendor responsibility

ARC® system eliminates:• Sensing orifice

• Instrumentation

• Air/electric supply

• Check valve

• Bypass flow control valve

• Pressure letdown valve

ARC® reduces maintenance:• All internals are in-line accessible

• Wear points such as levers and linkages are eliminated

• No external source of power required

• Actuators and controls are eliminated

• No calibration required

• No dynamic seals or packing

Gate valve(optional)

Storagevessel

Four-way airsolenoid valve

Flow meter

FIC

Pump

Pump

Automaticrecirculation

valve

Remote back pressureregulator (optional)

Multiple pressure-reducing orifice

Recirculationcontrol valve

Gate valve(optional)

Checkvalve

Checkvalve

Bypasselement

Storagevessel

Gate orcontrol valve

Gate orcontrol valve

To process

To process

Sensing orifice

Control Loop System

Yarway System



Dimensions and Weights for Class 900 and 1500 Valves, inches [mm]Nominal Weight

Valve Bypass Butt Weld FlangedSize Conn. A B C D E F G H J lb. (kg)

3" 11/2" 201/2 811/16 113/32 8 10 18 12 131/2 71/2 260 360[80] [40] [520.7] [220.7] [35.7] [203.2] [254] [457.2] [304.8] [342.9] [190.5] (118) (163)4" 2" 251/2 11 13/4 11 14 24 15 17 91/2 500 640

[100] [50] [647.7] [279.4] [44.5] [279.4] [355.6] [609.6] [381] [431.8] [241.3] (227) (290)6" 21/2" 36 155/8 23/8 14 20 34 21 221/2 12 1450 1725

[150] [65] [914.4] [396.9] [60.3] [355.6] [508] [893.6] [533.4] [571.5] [304.8] (658) (782)8" 3" 42 181/4 3 18 24 41 28 28 15 2650 3150

[200] [80] [1066.8] [463.6] [76.2] [457.2] [609.6] [1041.4] [711.2] [711.2] [381] (1202) (1429)Dimensions are the same for Flanged and Butt Weld end valves. Available in DIN and JIS end connections. Valve size and bypass connection – in., [DN];Dimensions – in., [mm]; Weight – lb., (kg).

Valveinlet

GMin. clearance

to removebonnet/discassembly

Bypassconnectionfar side

C

FMin. clearance toremove cascade

bushing

D

E

AB

H

J

Bypassdischarge

Valveinlet

GMin. clearance

to removebonnet/discassembly


C

FMin. clearance toremove cascade

bushing

D

E

AB

H

J

Bypassdischarge

RF flangedend perANSI B16/5

7100 Series – Butt Weld Ends

7100 Series – Flanged Ends

Bypassdischarge

E

H

J

Bypassdischarge

RF flangedend perANSI B16.5

H

J

D

C

AB

GMin. clearanceto removebonnet/discassembly

FMin. clearanceto remove

cascade bushing


Valve inlet

E

D

C

AB

GMin. clearanceto removebonnet/discassembly

FMin. clearanceto remove

cascade bushing


Valve inlet



Sizing GuideValve Size 3" 4" 6" 8"

Main Flow Range 120-400 GPM 300-715 GPM 600-1575 GPM 700-2675 GPM27-91 M3/hr 68-162 M3/hr 136-358 M3/hr 159-608 M3/hr

Bypass Cv Range2 Stage1 0.3-0.4 (0.26-3.5Kv) 1.0-11.5 (0.87-9.9Kv) 3.0-24.0 (2.6-20.8Kv) 5.0-40.0 (4.3-34.6Kv)4 Stage2 0.2-2.0 (0.17-1.7Kv) 0.8-8.0 (0.69-6.9Kv) 2.0-17.0 (1.7-14.7Kv) 4.0-28.0 (3.5-24.3Kv)

1) For DPs up to 1500 psid

2) For DPs between 1500 and 3000 psid

Pressure and Temperature Selector GuideModel No. Butt Weld 7105 7107

Flanged 7106 7108

ANSI Pressure Class 900 1500

Temperature Working Pressures (psig)

100°F 2220 3705 200°F 2025 3375300°F 1970 3280400°F 1900 3170500°F 1795 2995

Notes:1. Determine pressure class and model no. by consulting pressure and temperature selector guide

above.

2. To select valve size: refer to ARC® sizing guide above. Be sure normal and maximum pumpoperation flows fall within the flow range noted for the given valve.

3. Verify that bypass capacity meets minimum pump flow requirement:

Q minCalculate Cv: = DP

S.G.Q min = Minimum pump flow

Pump discharge pressureDP = minus

bypass line pressure

S.G. = Specific gravity of fluid pumped

{

InstallationValve Installation

(common line to receiver)Piping Installation

(separate line to receiver)

Recommended locationof back pressure orifice orback pressure regulator

when specified

Bypassoutlet

Bypassoutlet

Receiver vessel Receiver vessel

Blockvalve

Checkvalve

Long radius type pipe bends

Checkvalve



1

Per ANSI B16.5

51

See sectionalDetail C for pilotvalve representation

32

52

27 53 26 29 51 31

30

4819

18

47

46See detail B

51

17

50, 49 7 33 4 8 6 See detail A

3 2

5

59

15

13

58

12

14

22

56

55

2334

57

Detail B

11 10 9 7

Detail A

684337

3 2

5

46

47

51

18

1948

30

791011

315129265327

52

32

51

15

59

57

3423

55

56

22

14

12

58

13

1

17

50, 49 See Detail A

See Detail B

Detail B

Detail A

Per ANSI B16.5

See sectionalDetail C forpilot valve

representation



Item Part Material Specification

1 Body Cast Steel ASME SA216 Gr. WCBDIN 17245–Material2 Bonnet Cast Steel No.1.0619 GS-C-25

3 Pipe Plug SS Type 316Segmented ASME A4874 Retaining Ring SS Gr. CA6NMCL. A

5 Segmented SS Type 17-7 PHRing Retainer6 Spring SS Type 17-7 PH

7 Disc SS ASME SA351 Gr. CF8M

8 Orifice Snubber SS Type 3169 Retaining Ring SS PH 15-7 Mo10 Washer SS ASTM A276-XM19111,2 Seal Assembly Elastomer TFE and SS

Disc Lower SS ASTM A47912 Guide Bushing Type XM19

13 Switch Point SS ASTM A582Adjustment Screw Type 416Switch Point ASTM A58214 Adj. Screw Bushing SS Type 416

15 Spring Pin (Bushing) SS Type 18-817 Flow Element SS Type 316

182 Bypass Bushing SS ASTM A747Gr. CB7 Cu-1ASME SA479 192 Piston SS Type 410

221,2 Pilot Tube SS ASME SA564 Gr. 630and Stellite w/ Stellite 6 seat

231,2 Metering Orifice SS Type 43126 Spring Pin SS Type 18-8

Stroke Adjustment27 Screw SS ASME SA564 Gr. 630

28 Spring Pin SS Type 18-829 Lock Nut SS Type 18-8

Item Part Material Specification

30 Bypass Cover CS ASTM A10531 Stud Alloy Steel ASME SA193 Gr. B732 Nut Alloy Steel ASME SA194 Gr. 2H331,2 O-ring Elastomer TFE Propylene341,2 O-ring Elastomer TFE Propylene351,2 O-ring Elastomer TFE Propylene361,2 O-ring Elastomer TFE Propylene381,2 O-ring Elastomer TFE Propylene391,2 O-ring Elastomer TFE Propylene411,2 Seal Assembly Elastomer TFE Propylene421,2 Anti-Rotation Key SS ASTM A276 Gr. 440C431,2 Retainer (O-ring) Elastomer TFE Propylene441,2 Pilot Valve Seat SS Type 431

Pilot Tube452

Seal Plug SS Type 431

461,2 O-ring Elastomer TFE PropyleneBack-up Ring Carbon/graphite46a1,2 (3" Valve Only) Elastomer reinforced PTFE

471,2 O-ring Elastomer TFE Propylene481,2 O-ring Elastomer TFE Propylene49 Drive Screws SS Type 18-850 Nameplate SS Type 302

Pipe Plug513 (Pressure Tap) SS Type 316

52 Stud Alloy Steel ASME SA 193 Gr. B7

53 Stroke Adjustment CS ASTM A105Screw Cover551,2 Filter Gasket, Lower Elastomer TFE Propylene561,2 Filter Gasket, Upper Gasket Reinforced Teflon®

Filter Housing and57 Screen Assembly SS Type 316

58 Retaining Ring SS Type 17-7 PH591,2 Seal Assembly Elastomer TFE Propylene602 Retaining Ring SS PH 15-7 Mo

44

38

19

42

43

22

41

60

48

45

35

28

39

Detail C

36

27

Parts and Materials

Notes:1. Recommended spare parts for service

inspection.

2. Recommended spare parts for serviceoverhaul.

3. Optional on body.

60

35

45

48

41

19

22

43

42

38

44

39

28

36

27

Detail C



In high pressure pumping applicationsthe system often does not provideadequate pressure in the bypass line to prevent cavitation or flashing. Eitherof these conditions is undesirable in thatit can cause damage to both valves andthe pipe system or cause a reduction in flow beyond the minimum desired,jeopardizing the pump protectionsystem. All PRVs will experience avelocity induced recovery effect whichwill limit the amount of pressure drop a valve can take and cause a reductionin flow capacity.

The requirement of back pressure is generic to all pressure reducingapplications. Pressure reduction evenby multiple stage cascading such as inthe 7100 Series ARC® can minimize therequirement, however no valve designwill redefine a fluid’s physical properties.

This becomes especially important inmodulating systems. A fixed orifice willnot provide the proper back pressure atall flow levels. As the flow in the bypass

line is reduced, the orifice becomes lesseffective. Proper system design shouldbe used to optimize valve pressurereduction and consider all fluid dynamiceffects downstream of any pressurereducing device.

When adequate back pressure is notavailable downstream of a pressurereducing valve, vapor bubbles will formin the zone just downstream of the valvelast stage control surface. This zone isdefined as the “Vena Contracta” andrepresents the point of highest fluidvelocity and lowest pressure. Thepotential for 1) damage to downstreampiping components and 2) flowreduction exists from this point. Whenline pressure remains below the fluidvapor pressure, any existing bubbleswill remain and expand as piping frictionfurther reduces line pressure. This canbe defined as a “FLASHING CONDITION”and is characterized by a polishedappearance on affected surfaces. Whenthe line pressure drops below the fluid

vapor pressure and then recovers, anyentrapped vapor bubbles will collapse(implode). This is defined as a“CAVITATING CONDITION” and ischaracterized by a cinder likeappearance on affected surfaces. The resolution of either condition is best addressed by eliminating vaporformation. This can be ensured by theprovision of adequate back pressure.The “Backpressure Factor” is key toreliable system operation and must not be ignored in piping designconsiderations.

As such we feel it is the obligation of a responsible Automatic RecirculationControl Valve manufacturer to analyzethe system needs and supply a BackPressure Regulator (BPR) when it iswarranted by the laws of fluid dynamics.For on/off systems this could be asimple orifice, but for modulatingconditions it must be a device like the BPR noted herein.

Back Pressure Regulator (BPR)

Checkvalve

Inlet

Bypassoutlet

Yarway 7100 ARC® Valve

Back pressureregulator

Flanged body BPR illustrated(installed between flanges).Wafer BPR is also available.

Flow



Back Pressure Regulator (BPR)

B

øA

2 7 10 11 4 3 9

6 1 12 5 138

Flow

Wafer BPR – 3/4" to 6" Remote Mounted Flange BPR – 11/2" to 10"

Dimensions and WeightsDimensions, in. [mm] Wafer

BPR A B Flanged C Approx. Weight Size +/- 1/16" [1.6] +/- 1/16" [1.6] +/- 1/16" [1.6] lb. (kg)

3/4" 11/6 [42.9] 4 [101.6] N/A 5 (2.3)11/2" 27/8 [73.0] 27/8 [73.0] 6 [152.4] 5 (2.3)2" 35/8 [92.1] 33/8 [85.7] 6 [152.4] 8 (3.6)3" 5 [127.0] 45/8 [117.5] 8 [203.2] 21 (9.5)4" 63/16 [157.2] 53/4 [146.0] 12 [304.8] 40 (18.1)6" 81/2 [215.9] 71/2 [190.5] 17 [431.8] 96 (43.5)

For Flanged 8" and 10", contact your sales representative.

2

FlowFlow

7 10 11 4 3 9

6

B

C

ØA

1 12 5 8 13943611

112, 13579 210

Parts and MaterialsItem Part Material1 Body ASME SA1052 Seat ASTM A747-CB7Cu-1 with Heat Treatment

3 Plunger Guide ASME SA564 Type 630 (17-4 PH) H-900 Heat Treatment

Energized 4 “U” Cup Seal Filled TFE

5 Plunger ASTM A479-431 Stainless Steel with Heat TreatmentASTM A564 Type 631 (17-7 PH) H-900

6 Spring Heat Treatment7 Spring Retainer AISI 304 Stainless Steel8 Spiral Ring AISI 3029 Flow Conditioner ASME SA747-CB7Cu-110 Retaining Ring AISI 316 Stainless Steel11 Set Screw ASTM A194 Grade 8 (18-8)12 Nameplate AISI 300 Series Stainless Steel13 Drive Screw Stainless Steel

Option: BPR is available in stainless steel configuration upon request.

Parts and MaterialsItem Part Material1 Body ASME SA1052 Seat ASTM A747-CB7Cu-1 with Heat Treatment3 Plunger Guide ASTM A276-S21800 (Nitronic 60 Bar)4 O-ring TFE/P (Fluoraz 799)

5 Plunger AISI 431 Stainless Steel with Heat Treatment

6 Spring Retainer AISI 304 Stainless Steel

7 Spring ASTM A564 Type 631 (17-7 PH) H-900 Heat Treatment

Energized 8 “U” Cup Seal Filled TFE

9 Retaining Ring AISI 304 Stainless Steel10 Nameplate AISI 300 Series Stainless Steel11 Drive Screw Stainless Steel12 Spacer A269-30413 Spiral Ring Inconel® X-750



Performance – Profiled in Yarway’s Hydraulic Performance Test LabIn our hydraulic performance test laboratory, state-of-the-art data acquisition and computer graphics techniques are called upon for evaluation of the significant performancecharacteristics of Yarway recirculation control valves. The lab’s equipment makes it possible to test a valve over its complete flow range for factors including:

• Total flow through the pump

• Disc position

• Pressure drop across the main check

• Bypass Cv• Bypass DP

• Valve response to sudden changes in flow

• Bypass piston pressure

These detailed analyses are the user’s complete assurance that the valve meetsperformance requirements in all respects and can be supplied with the valve.

A certified test curve is shipped with each valve (see page 11 for example).

Insist on it, as you would for your pump!

Hydraulic Performance Test Lab



0 200 400 600 800 1000 1200 1400 1600 1800

Main (GPM)

0 200 400 600 800 1000 1200 1400 1600 1800

0.0

5.0

10.0

15.0

20.0

25.0

Mai

n D

P (

PS

ID)

0.000.200.400.600.801.001.201.401.601.802.00

Dis

c L

ift

(IN

)

8 09.0

10.0

0.0

5.0

10.0

15.0

20.0

25.0

0.000.200.400.600.801.001.201.401.601.802.00

0.01.02.03.04.05.06.07.08.09.0

10.0

400

600

800

1000

1200

1400

1600

1800

To

tal

Flo

w (

GP

M)

0

200

0 200 400 600 800 1000 1200 1400 1600 18000 200 400 600 800 1000 1200 1400 1600 1800

100

120

0

20

40

60

80

100

120

0 200 400 600 800 1000 1200 1400 1600 1800

Pisto

n P

ressure

(PS

IG) -

--

--

Main (GPM)

0 200 400 600 800 1000 1200 1400 1600 1800

Main Flow (GPM)

Byp

ass

Cv

Certified Test Curve



How to Order

Our sales representatives will help you select the correct valve for your application.Please complete this form before contacting the sales office to help ensure all necessary information is provided.

Comments:

NACE Materials Required?

Flow Test with Performance Certificate Required?

Customer Inspection Required Prior to Shipment?

Certificate of Compliance for Hydro Test Required?

Magnetic Particle Test Required?

Radiograph Inspection Required (specify scope)?

Certified Material Test Report (Pressure Containing Components only)?

Orientation of ARC Valve:

Desired End Connections:

Desired Pressure Class:

Desired Body Material:

Desired Seal Material (except 2" to 8" 9200 and 9300):

Pump Drive Type:

Ethylene Propylene (EPR or EPDM)

150 300 600 900 1500 2500

Vertical Horizontal

Raised Face Flange

Flat Face Flange Ring Type Joint (RTJ)

Butt Weld EndsOther - Specify in “Comments”

A216 Gr. WCB A351 Gr. CF8MA351 Gr. CK3MCuN (6Mo)

TFE Propylene (Aflas or Fluoraz)Fluorocarbon Rubber (Viton®)Other - Specify in “Comments”

Constant Speed - Motor DrivenVariable Speed (VFD) - Motor DrivenVariable Speed - Turbine DrivenOther - Specify in “Comments”

A995 Gr. CD3MWCuN (Super Duplex)

Liquid: Boiler Feed Water (In this case disregard S.G. and V.P.)

Other (Please specify) _________________

Specific Gravity:

Vapor Pressure:

Viscosity:

Fluid

Please Enter Both TemperaturesTemperature

Normal temperature at ARC Valve:

Maximum temperature at ARC Valve:

°F °C

Please Complete Pressure RequirementsPump Discharge Pressure

Pump pressure at Shut-off (zero flow):

Pump pressure at Normal -Process- flow:

Pump pressure at Minimum -Process- flow (optional): (if Minimum Flow is to be considered in sizing)

Pump pressure at Minimum pump protection flow: (at Minimum required “Recirculation Flow”)

ARC Valve Bypass line pressure: (Line pressure at ARC Valve bypass port)

psi bar KgF/cm2 Kpa

Pump Flow Please Complete Flow Requirements

Normal -Process- flow:

Maximum -Process- flow:

Minimum -Process- flow (optional): (if Minimum Flow is to be considered in sizing)

Minimum pump protection flow: (Minimum required “Recirculation Flow”)

GPM M3/H BPD

Additional Info:

E-Mail:

Delivery Required:

Customer:

Company:

Project:

Location:

Phone:

Qty Required:

Tag(s) ID:

Automatic Recirculating Control (ARC®) Valve Data Sheet

Flow tests are generally conducted on all model 5300 and 7100 ARC® valves and one model 9100 or 9200 ARC® valve per sales order line item at no additional cost.Model 9300 ARC® valves and other flow test requirements are upon request and at additional cost. If flange drilling is other than ANSI, please specify in “Comments.”Please include Pump Curve if available.

Documents

A self-contained system, the 7100 Series ARC valve has a ... · Flow meter FIC Pump Pump Automatic recirculation valve Remote back pressure regulator (optional) ... Dimensions are