Pressure Independent Control Valve

5/28/2018 Pressure Independent Control Valve

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Control for a GREENEnvironm

Recommended Applications:

Where balancing at reduced loadsis needed, such as ofce buildings,schools or hotels Where temperature variance can notbe risked, such as hospitals,laboratories or prisons Where longer actuator life is required Where the primary variable owsystem needs to be optimized

Pressure Independent

Control ValvesPIC-V& MVP


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Pressure Independent Control Valves

How Does Flow Change?Flow (Q) changes as pressure (P) and/or open area (A) changes. This is represented with the simple formula:

Q= A*P Where:

Q= Flowrate in gpm; A= Open Area; P= Pressure Differential

Flow Change with PressureIndependent ValveIf you maintain a constant pressure (P) drop AND a

constant area (A) the ow (Q) remains unchanged.

Q=A*P

The actuator rotation moves the horizontal xed ow lineup or down to provide temperature control modulation.Simultaneously, ow control is maintained along thehorizontal portion of the graph within the minimum &maximum differential pressure limits when the pressure inthe system changes.

Flow Change with a Traditional Actuated ValveIn a traditional Actuated Ball Valve or Actuated Globe Valveas the pressure (P) changes in the system the owrate (Q)changes through the valve. If the zone was satised and nowthe ow changed the actuator now needs to respond to thischange by opening or closing the valve. This leads to huntingand is a big reason occupants complain about the roomtemperature.

Flow Change with FlowLimiting and ActuatedValveIn a system with Flow Limiting

Cartridge and Actuated Ball Valve a

the pressure (P) drop increases, thopen area (A) in the cup decreasesso the result is no ow (Q) change.The only way to increase the ow isto modulate the control valve belowfull ow.

Flow(GPM)

Pressure Differential (PSID)

Flow(GPM

)


Flow(GPM)



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Pressure Independent Control V

Tis the temperature difference across thechiller. If we can increase the water T, we canmaximize chiller capacity and reduce pumpingrequirements.

Increase your T, reduce your owrate, sameheat transfer!

How Does Flow Affect T?BTU/Hr = 500 x gpm x T

= 500 x 500x 2 (lowT)

= 500 x 200x 5 (low T)

= 500 x 100x 10 (moderateT)

= 500x 50x 20 (goodT)

= 500 x 33x 30 (excellentT)

Loads increase

Valves open

Pump speed increases

Oversized valves are now overowing

Tis lowered

More chillers and pumps turn on

Flow increases

T is lowered again

Chiller output capacity is reduced

Efcienty is reduced (higher kW/Ton)

Loads increase

Valves open

Pump speed increases

PI valves maintain the FLOW to the loa

Tis maximized

Fewer chillers and pumps are used

Flow is unchanged and matched to the lo

T maximized

Chiller output capacity is increased

Efcienty is increased (lower kW/Ton)

What Causes Low T ? What prevents low T

NormalExpectedE

vents

Unfortunatesequenceofevents

NOFLOWCONTROL

Ba

lancedsequenceofeventsu

sing

PressureIndependentValves-

TOTALFLOWCONTROLisreq

uired!

{500,0

0

0

Pressure independent control valves do not allow a change in flow rate when thepressure differential across the valve changes.

Only a change in the load will cause a change in the flow rate A change in P will not cause flow change Flow, coil output, and controlled temperature remain stable Pressure independent control valves balance to the load


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PICV

MVP

Save valuable time by eliminating Cv selection in thevalve selection process. Simply choose the smallestPressure Independent Valve that satises the owrequirements and you will have valve authority.

Control ow exactlyespecially at reduced loads or loadsless than design.

Control ow exactlyno overow or underow at coils ever.

Lower system energy costs through efcient heat transferby providing relief from many causes of low T at coils.

Increase actuator life expectancyless valve and actuatormovement needed to maintain set point since pressurechanges are compensated for by the diaphragm cartridgeassembly instead of by actuator position changes.

PIC-V: Actuator uses full 90 stroke, eliminating installationerror in eld. MVP: Actuator uses six full 360 rotationsassuring ow accuracy.

PICV: Field repairable. Both actuated stem andcartridge can be changed without removing valve from line.

Flow rate can be determined by reading valve positionon top of actuator.

MVP: Valve position can be sent back to controlsystem so ow can be automatically calculated.

Simple retrotno need to know exact ow requirement.

Simple retrotno balancing required with pressureindependent ow control.

Eliminates balancing valves.

When conventional 2way valves in variable ow systems open or close, it causes a

pressure change to other valves in the system.

Pressure Independent Control Valves (both the MVP and the PIC-V valves) maintain

required ow rate regardless of these pressure changes.

The actuator modulates the Pressure Independent Control Valve to a required xed owbased on load (or zone) requirements, independent of pressure. When the zone is satis

the actuator stops rotating and the valve is now set at optimum ow. If the system pressu

changes the internal diaphragm compensates for the pressure change and maintains

constant ow rate without cycling by the actuator. The ow does not change until the con

system tells the actuator to change the valve position based on load changes.

This stable ow means less work for the actuator, and actuator life is therefore increased

Pressure Independent Control Valves can limit the ow rate to almost an innite number

of ow rates below the specied maximum, providing balancing at any point below and

including the maximum ow rate.

Valve Operation

Provide more cooling from existing chillers as opposedto buying additional or new chillers.

Multifunction housing reduces piping and installation timas well as number of components required.

P/T test ports standard for checking and testing valveand coil temperature and pressure.

Eliminate reverse return piping, oversized main piping,andundersized branch piping hydronic strategies.

Features & Benets


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Diaphragm PressureCompensating Cartridge:

Spring and diaphragm moveaccording to pressuredifferential, maintaining aconstant pressure drop acrossthe ball.

Actuator and Plate Can BeRotated After Mounting:

Valve can be installed in

conned spaces. Makeswiring the actuator easier.Plastic Mounting PlateExtensions and Handl

Do not corrode in chilledwater applications. Reducheat transfer to actuator inhot water applications.

BlowOutSafetyRetainer/Replaceable Stem:

Actuated ball stem can be easilyand safely replaced while the valveis installed in the pipe line.(Patent Pending)

Universal MountingPlate:

One mounting plate can bused with all manufactureactuators, including GriswControls actuator.

Union End Connection

Available with Male, FemaThreaded or Sweat.

Manual Operation:

Valve can be operated in theevent of a power failure.

Patented OptimizerParabolic Flow Insert:

Provides Equal Percentag

Control and limits the owto zone set point with +/- 5accuracy.No Cv sizing is required.U.S. Patent #5,937,890.

Positive Shut Off:

Accurate control of uidthrough coils, no leak by evenat low ow rates..

Isolation:

Manual Ball Valve to isolate

coil or valve for maintenance.

Combination Pressure/Temperature Test Port/Air Vent:

Enable easy pressuredifferential readings as wellas air to be vented.(Patent Pending)

Patented Seal andO-Rings:

Reduce torque required torotate ball (less than 35 inlbs), reducing actuator size.U.S. Patent #6,948,699.

Sizes available:

1/2 to 3Flow rate: 1.5 to 95 GPM

OperatiPICVSection View


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PIC-VValve Flow Rates

ActuatedControlValve Section

DP RegulatorIsolationSection

Water exitsvalve -pressureis low

Water entersvalve - pressureis high

Upstream highpressure sensingport transferspressure throughthis channel

PICVSection View - Three Valves, One Body

When inlet pressure changes, the pressure at the top of the diaphragm also changes. This alters the low pressure area underthe diaphragm so that the pressure drop across the ball remains constant. A constant PSID means a constant ow rate!

MODELNO

SIZE CONTROLRANGE

PSID

MAXIMUM

FLOWGPM

LOWEST MASETTING

GPM

MVP31B2

21/2

3

5.158

112.0

39.0

MVP32B2

21/2

3

11.658

155.6

55.5

MVP41B 34

5.158 147 55

MVP42B 34

8.658 222 73.3

MVP51B 56

5.158 370 103

MVP52B 56

8.658 469 118

12 valves require a 2 threaded adapter, purchased separately.

MVP Valve Flow Rates

MODELNO SIZE

PSIDRANGE

HEADLOSS INFEET4

CLOSE-OFFPSID

GPM

PICVO

1/2,3/4, 1

3-35 6.9

100

1.0, 2.0, 3.0, 4.0,5.0, 6.0, 7.0

3/4, 1 6-35 13.8 8.0, 9.0, 10.0,11.0, 15.0

PICV1

1L,1-1/4,1-1/2

4-50 9.2 10, 15, 20

5-50 11.5 25,30

1-1/4,1-1/2

6.5-50 14.9 35

PICV2

1-1/2L,2,

2-1/2,3

4-58 9.2 25, 30, 35

6-58 13.8 40, 45, 50

7-58 16.155, 60, 65, 70, 75,

80, 85

2,2-1/2,

311-58 25.3 95

4Head loss in feet is required for pump head calculations.(1 PSI = 2.307 feet of water).


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MVP2" to 6"

MODELNO SIZE

A: LENGTH UNION CONNECTIONS B

HEIGHTC

LENGTHD

HEIGHTE

HANDLEF

HEIGHT

DEPTH

(NOTSHOWN) WEIGFIXED

XFIXED

FIXEDXUNION

FNPT MNPT SWT

PIC01/23/41

6.76.76.9

7.97.98.0

1.01.0

N/A

1.01.01.4

0.70.91.3

5.39.69.69.7

2.5

2.5

9.9 4.1 3.3

PIC11 L

11/411/2

10.49.89.6

10.610.310.2

1.71.71.7

1.71.71.7

1.71.71.4

6.012.312.011.9

2.7 10.7 5.0 7.8

PIC211/2 L

211.911.8

12.612.5

1.6N/A

1.61.6

1.71.6 7.1

14.013.9 3.5 11.8 6.0 15.

PIC321/2

312.813.0 N/A N/A N/A N/A 6.6

14.014.3 3.1 11.4 5.0 16.

PICV1/2 to 3

Nominal Values (in inches and lbs unless otherwise noted). 1Length measured with fixedend FNPT; SWT end connection may be longer2For overall length, add union connection length to fixed x union body length3Tailpiece is not available for this size. Male tailpiece used with coupling.

D

A

C

B

MODELNO

SIZEA

LENGTHB

HEIGHTC

HEIGHT

D(ACTUATOR

WIDTH)WEIGHT

MVP3_21/2

38.81 9.7 3.7 4.0 MAX 27.8

MVP4_

3

4

512.6 11.4 5.3 4.0 MAX 75.0

MVP5_

4

5

616.6 13.3 7.1 4.0 MAX 148.0

1Length of 2" valve will change depending on the flange adapter used.

PIC-V Dimensions

PIC-V Dimensions

Dimensions

All Griswold Pressure Independent Valves

are easy to install without the use of

cranes or other heavy equipment


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To determine the PIC-V owrate:

All PIC-V valves are installed with a 90 actuator. Using the chart supplied with every valve, the end user (or the contsystem) can determine the ow rate based on the actuator position. For a modulating actuator the actuator position casent back to the control system so that owrate can be determined.

This can be used for fow verication for LEED requirements or ow measurement during commissioning.

STEM GPM

100% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 15.0

95% 1.0 2.0 2.9 3.8 4.7 5.8 6.5 7.0 6.8 7.6 9.9 15.0

90% 1.1 2.0 2.8 3.6 4.2 5.1 6.2 6.9 6.5 7.0 7.0 15.4

85% 1.1 1.9 2.7 3.1 3.7 4.5 5.6 6.2 5.9 6.4 6.2 13.8

80% 1.1 1.7 2.5 2.8 3.3 4.0 4.9 5.6 5.5 5.8 5.5 8.5

75% 0.99 1.5 2.4 2.5 2.8 3.4 4.2 4.9 4.8 5.2 4.9 6.7

70% 0.84 1.3 2.2 2.3 2.5 2.9 3.7 4.2 4.3 4.6 4.2 6.1

65% 0.72 1.2 2.1 2.1 2.3 2.4 3.0 3.6 3.7 3.9 3.8 5.4

60% 0.62 1.0 1.9 2.0 2.1 2.0 2.5 3.1 3.2 3.3 3.2 4.7

55% 0.50 0.94 1.8 1.8 1.9 1.8 2.2 2.8 2.8 2.8 2.7 4.2

50% 0.40 0.86 1.6 1.5 1.5 1.6 1.8 2.3 2.3 2.2 2.1 3.6

45% 0.38 0.69 1.4 1.3 1.2 1.4 1.4 1.8 1.8 1.8 1.7 3.1

40% 0.34 0.58 1.2 0.97 0.86 1.0 1.1 1.4 1.5 1.5 1.2 2.6

35% 0.28 0.48 0.92 0.65 0.54 0.72 0.79 0.98 1.2 1.1 0.82 2.1

30% 0.20 0.34 0.69 0.37 0.32 0.43 0.47 0.58 0.85 0.67 0.46 1.6

25% 0.18 0.19 0.50 0.23 0.13 0.21 0.27 0.30 0.57 0.38 0.21 1.2

20% 0.17 0.14 0.36 0.15 0.08 0.12 0.09 0.17 0.35 0.20 0.14 0.71

15% 0.17 0.16 0.24 0.09 0.07 0.12 0.06 0.14 0.20 0.12 0.10 0.19

10% 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

5% 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Closed 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00


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The dip switches are pre-set at the factory for maximumow rate. Dip switches can, however, be changed in theeld to a different ow rate if desired. First, you mustdetermine the current ow rate. This is done by locatingthe valves stem position on the dip switch table. Once

the stem position is located, follow the table across to thefar left column, which will indicate the maximum ow ratefor that setting. To change the ow rate, simply nd thedesired ow rate in GPM for your valve size on the tableand set the six dip switches to the corresponding positionas indicated in the table. Using the example below, thevalves stem position is 1.6. Going across the table, youcan see that the maximum ow rate for a 1/2 to 1 valveis 4.5 GPM, and for a 1 to 11/2 valve it is 13.4. You canalso see the current positions of each dip switch. Please

Dip switch

To determine the MVPow rate1/2 to 11/2

MAXIMUM FLOWRATE

DIP SWITCH POSITION

POSITIIN STE

ROTATIOFROM

CLOSEROTATIO

1/214.646PSID

GPM

111/25.846PSID

GPM 1 2 3 4 5 62.8 8.4 ON ON ON ON ON ON 1.0

3.1 9.2 OFF ON ON ON ON ON 1.1

3.4 10.0 ON OFF ON ON ON ON 1.2

3.7 10.9 OFF OFF ON ON ON ON 1.3

3.9 11.7 ON ON OFF ON ON ON 1.4

4.2 12.5 OFF ON OFF ON ON ON 1.5

4.5 13.4 ON OFF OFF ON ON ON 1.6

Example: 1.6 is equivalent to 4.5 GPM on a 3/4 valve

The valve position can be readfrom the LED display on the topof the actuator

Dip Switch Settings


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PPIC-V 1/2" to 3"

Select a Valve Size: 0=1/2" to 1"; 1=1" L to 11/2"; 2=1 to 1/2 L to 3

Select a PSID Control Range: 1=2.9 to 20; 2=2.9 to 60; 3=5.8 to 60

I C

FIXED END OR UNION END 1 UNION END ONLY 1

VALVE FEMALE THREADED FEMALE SWEAT MALE THREADED

PIC0 1/2=E; 3/4=F; 1=G 2 3/8=K; 1/2=L; 3/4=M; 1=N 1/2"=H, 3/4"=I, 1"=J

PIC1 1"=G, 11/4"=P, 11/2"=Q 1"=N, 11/4"=K, 11/2"=W 1/2"=H, 3/4"=I, 1"=J, 11/4"=S, 11/2"=T

PIC21"1/4=P3, 11/2"=Q, 2=R2

21/2=S5, 3"=T511/4=K3; 11/2=W4; 2=Y 1=J; 11/4=S; 11/2=T; 2=U

For fixed end by fixed end fill in 2nddigit with an X

Insert Actuator Model Number. If Actuator is supplied by others, insert 1 for

Neptronic, 2 for Johnson Controls, 3 for Invensys, 4 for Honeywell, 5 forSiemens, 6 for Belimo, 7 for KMC Controls, 8 for ELODrive

T= Optional3 x 3 Aluminum Hanging ID Tag

1 3 E E 2.0 5 0

1 Select the fixed end first and the union end second. 2 Tailpiece not available for this size. Male tailpiece used with coupling. 3 Fixed end not available for this size. Union tailpiece only. A fixed end with sweat adapter can be used as a substitute. 4 Sweat Fixed end not available for this size. A fixed end with sweat adapter can be used as a substitute. 5 21/2 and 3 is available only with fixed ends.

Standard Fields

M

MVP21/2" to 6"

Select a Valve Size: 3=21/2 to 3, 4=3 to 4, 5=5 to 6

Select a PSID Control Range: 1=5.158, 2=8.658 or 11.658

Select Actuator: 1=Position Display (Nonfailsafe) 2=Failsafe and Position Display

V P B3 1 2

Standard Fields

SIZE

MODEL

NO FLOWS1/2, 3/4, 1

PICV01.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0

3/4, 1 8.0, 9.0, 10.0, 11.0, 15.0

1L, 1-1/4,

1-1/2 PICV1

10, 15, 20

25,30

1-1/4, 1-1/2 35

1-1/2L, 2,

2-1/2,3 PICV2

25, 30, 35

40, 45, 50

55, 60, 65, 70, 75, 80, 85

2, 2-1/2,3 95

Model Numbe


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SAVINGS

EXPENSE MANUAL PI VALVE or FLOW LIMITING

Valve $139* $201

Manual:Balancing Labor/PI Valve: Verification Labor (@$75/hr) $50 (40 min) $12 (10 min)

Installation Labor (@$75/hour) $20 (15 min) $10 (7 min)

TOTAL INSTALLED COST $209 $223

Only a 6% premium for PI technology!

After the money is spent

Does your system maintain flow at full load?? ? YES

Will it limit flow when system pressure changes? NO! YES

Can it help improve chiller T? NO! YES

Does it reduce operational energy costs? NO! YES

*Includes manual valve and modulating control valve

CASE STUDY -

NEW CONSTRUCTION

David Braley Athletic Center, McMaster University (Hamilton, Ontario) 400 Tons total capacity 11 Pressure Independent Valves added Coils selected for design of 18F System has been observed to run effectively at 24 gpm-10% design ow T recorded as high as 31F Booster pumps rarely used Annual Savings ~$8,000USD

CASE STUDY - RETROFIT

Vancouver International Airport: 2000 Tons total capacity (Primary/Secondary) Low T @ 7F Customer complaints about air temperature 25 Pressure Independent Valves added (AHUs)

CHW Set Point changed from 43F to 40F Bypass Line - Bi-directional ow meter added Bypass Line - Check valve removed T Increased to 21F Pump ow reduced by 66% Standby chillers turned off Customer complaints eliminated Annual Savings ~$39,500 USD


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Standard 2way IRISPackage with Unimizer

Custom 3way 3UFPackage with Unimizer

Custom 2way 3WRPackage with Unimizer

Isolator S with 20Mesh Strainer,PT,and Drain Valve

Union with Air Vent

2Way Unimizer

(with any standard actuator)

Isolator R with Automatic FlowControl Cartridge and two PT valves

YStrainer with Butterfly andDrain Valve

Tee Connection

3Way Unimizer

Flanged Valve withButterfly Valve

Accessory Flanges with PTs

YStrainer with Butterfly Valve

Tee Connection

Butterfly Valve on Bypass

3Way Unimizer

Wafer Valve with Butterfly Valve


Griswold Controls Coil Piping Package program includesover 900 standard packages. Engineers do not have todesign or detail the various elements that are required at thesupply and return end of each coil. They can just select oneof Griswold Controls standard packages, which are available

for both automatic and manual ow control applications.We also offer downsized components to the automatictemperature control as a standard package. Standardpackages up to 2 ship within 48 hours after the order isreceived direct to the job site, preassembled and ready toinstall. If variations to the standard packages are necessarythey can be readily accommodated, but they will affect the48 hour ship time. In addition, options such as hoses and

extension kits can be easily added, but similarly this willincrease the lead time.

Standard packages offer:

Wide selection of preassembled, easy to order conguration

Easy ordering: order by specic part numbers

Timely delivery

Variety of options available: downsized automatictemperature control, extra pressure / temperature portsand the inclusion of Griswold Controls Automizer andUnimizer temperature control valves.

Air Handling Units 2 to 3

Standard 2way IRISPackage with Unimizer

Terminal Units 1/2 to 2

Custom 3way 3UFPackage with Unimizer

Equipment Rooms 4 to 8

Custom 2way 3WRPackage with Unimizer

Custom Coil Piping PackagesGriswold Controls offers custom packages in line sizes

from 21/2 thru 8. The components can be shipped looseor assembled and shipped on a skidyour choice. Thesepackages are available with ange, weld or grooved end

connections and can include balancing valves, strainers,

buttery valves, control valves and reducers. A varietyof options are also available for customized packages,including the addition of hoses and extension kits.

Isolator S with 20Mesh Strainer,

PT, and Drain Valve Union with Air Vent 2Way Unimizer (with any standard

actuator) Isolator R with Automatic Flow

Control Cartridge and two PT valves

YStrainer with Buttery and

Drain Valve Tee Connection 3Way Unimizer

Flanged Valve with ButteryValve


YStrainer with Buttery Valve Tee Connection Buttery Valve on Bypass 3Way Unimizer

Wafer Valve with Buttery Valv Accessory Flanges with PTs

Griswold Controls Representative

4/1

F5363B

48 Hour Standard Coil Piping Packages

Standard and Custom Coil Piping Packages

2803 Barranca Parkway Irvine CA 92606 | Phone 800 838 0858 Fax 800 543 8662

E-mail [email protected] | www.griswoldcontrols.com

Pressure Independent Control Valve

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