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Valtek Gaseous Noise Reduction Equipment

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Valtek Gaseous NoiseReduction Equipment


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Control valve noise is generated by high pressuredrops across the valve, and by the subsequentturbulence downstream. As a direct result, noiseis radiated to the surrounding area by the down-stream piping system. In situations where equip-ment damage or personal injury could be causedby a noise source, noise attenuation is not onlydesired, it is mandatory.

Several of the following factors must be consider-ed before expensive noise suppression equip-ment is chosen:

• Does the application really require noiseattenuation?

• What are the low or no-cost alternatives tonoise attenuation?

• If noise attenuation devices are necessary,what lower-cost equipment can be specified?

Is Noise Attenuation Necessary?If the predicted sound pressure level (SPL) exceeds 85 or 90dBA, it is often suggested that noise suppression devices berequired. However, higher noise levels may be acceptableif the noise is not associated with equipment damage and islocated away from workers. For example, if the valve isinstalled on a tower some distance from workers, the dis-tance itself may solve the problem, although ear protectionmay be required should workers approach or climb the tower.

Other Low-cost AlternativesOther possible low-cost alternatives to noise suppressionequipment are (1) insulating the pipe, (2) locating the valvedischarge directly into a vessel (allowing the noise to beabsorbed by the vessel), (3) relocating the noise source(such as the downstream piping) outside an enclosed area,(4) reversing the flow direction through the valve, or (5)reducing the pressure drop across the valve.

Inexpensive Noise Suppression EquipmentAlternatives

If the above suggestions are not feasible, noise suppressionequipment in most all cases is required. To reduce noise orsound pressure levels to an acceptable level, Flowserveprovides a wide variety of economical noise reduction de-vices, which minimize and often eliminate higher-pricedsolutions. These devices include:

• Multi-staged Tiger-Tooth valves for SPL reductionsup to 30 dBA

• One and Two-stage MegaStream valves for SPLreductions up to 15 dBA

• MegaStream resistance plates and diffusersfor reductions up to 15 dBA

• In-line silencers for venting applications or for beyond25 dBA

Often, any one of these noise reduction devices in serieswith a control valve can be selected to attenuate noise to theacceptable SPL required. For example, a MegaStreamplate or diffuser, when installed downstream from a standardValtek® control valve, provides about the same dBA reduc-tion as a one or two-stage MegaStream valve, but at a lowercost. For extremely high pressure drops where multi-stagevalve trim may be considered, it may be cost-effective toinstall a MegaStream plate, diffuser, or silencer downstreamfrom a smaller one or two-stage MegaStream valve.

MegaStream control valves are available in sizes rangingfrom 1 to 36-inches, and in ANSI Classes 150 to 2500.Special one and two-stage trim reduces noise up to 15 dBA.


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Table I:Tiger-Tooth Valve Materials of Construction

Body Style Globe, angle, fabricated angle

Sizes 11/2 42-inch

ANSI Rating 150 — 4500

Flow Direction Under the plug

Body Materials Carbon Steel, stainless steelMonel, other materials as required

Stack Materials Bronze, 316 stainless steel416 stainless steel, Stellite,other materials as required

End Separable and integral flanges,Connections NPT, socketweld, Grayloc

Cross section of Tiger-Tooth Stack.

Tiger-Tooth control valves are available in sizes ranging from 1 1/2

to 42-inches, and ANSI Classes 150 to 4500. Multi-stage stack(attenuator) reduces sound pressure levels by up to 30 dBA.

TIGER-TOOTH MULTI-STAGE VALVES

When severe gaseous noise is encountered in anapplication, Tiger-Tooth control valves with multi-stagecapability is the answer.

As flow passes through the Tiger-Tooth valve, it travelsfrom the center of the Tiger-Tooth stack (attenuator)through a pattern of teeth in a radial, wave-like mannerto the outlet, undergoing a series of sudden contrac-tions and expansions. This process reduces pressurein steps witout the large, single pressure drop typical ofconventional valves – significantly reducing gaseous noise.

Tiger-Tooth valves can reduce sound pressure levelsup to 30 dBA in gas applications.

For more information, dimensions and more detailedexplanation of Tiger-Tooth valves, refer to Flowserve'sTiger-Tooth Control Valves brochure.


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Table III: One and Two-stage MegaStream C V

Max. SeatSize Trim No. Stages C V Area Stroke

1 .81 1 11 .52 .75.50 2 6 .20 .75

11/2 1.25 1 29 1.23 1.001.00 2 22 .79 .75

2 1.62 1 46 2.07 1.501.00 2 25 .79 .75

3 2.62 1 106 5.41 2.002.00 2 78 3.14 1.50

4 3.50 1 190 9.62 2.502.62 2 130 5.41 2.00

Table II: One and Two-stage MegaStream

Style Globe, angle, Y-pattern

Sizes 1 - 4 inch

ANSI Rating Class 150 - 600

Flow Direction Flow under the plug

Materials of Carbon steel MonelConstruction stainless steel, nickel, chrome-

moly, Titanium, alloy 20, bronze,Hastelloy B, Hastelloy C

End Separable and integral flange,Connections NPT, Socketweld, Grayloc

ONE AND TWO-STAGEMEGASTREAM VALVESMegaStream valves equipped with one or two-stageattenuators represent an economical and innovativeapproach to low noise applications by permitting up to15 dBA noise reduction. A standard attenuator isconstructed from heavy-duty, 316 stainless steel, drilled-hole cylinders.

Since one standard design exists for each valve size,special engineering is not required. This results in lower

prices and quicker deliveries. Because of parts inter-changeability with standard seat retainers, one andtwo-stage attenuators can be fitted into conventionalMark One valves without special or additional parts.The simplicity of design also permits easy removal andcleaning.

For more detailed information about one and two-stageMegaStream valves, see Flowserve’s MegaStream Con-trol Valves brochure.


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Standard MegaStream plates, both the housing andperforated hole plate stages, are constructed fromcarbon steel. However, one additional option constructedfrom 304 stainless steel for both the housing and stagesis available. Large plates are available with lifting plugs.

Typical MegaStream plate applications include gas pres-sure reducing stations, gas vents and flare systems.

Table IV:MegaStream Plate Specifications

Body Style Flangeless wafer, flanged wafer

Sizes 11/2 - 24 inch

Rating ANSI 150-600, 900, 1500, 2500

Flow Direction One way only

Standard HoleSize 0.19 in. dia.

Valve Recovery 0.8 for single stage,Factor (F

L) 0.9 for multi-stage

Materials of Carbon steel (standard) andConstruction 304 stainless steel (optional).

Table V: MegaStream Plate C V

SIZE 1 STAGE 2 STAGE 3 STAGE

11/2 13 8 62 23 15 113 52 34 264 92 60 466 208 136 1048 371 243 185

10 580 380 29012 835 547 41714 1136 774 56816 1484 972 74218 1879 1231 93920 2320 1520 116024 3340 2188 1670

NOTE: All values shown at maximum CV per givensize; reduced CV’s are available upon request. CV datadetermined with standard 0.19-inch diameter hole size;varying hole sizes will change the above values.

Two-stage plate Three-stage platewith drain with lifting lug

MEGASTREAM PLATESSimilar in many respects to a MegaStream attenuator,MegaStream resistance plates are installed betweenraised face flanges downstream from a Valtek controlvalve. Each plate incorporates a series of stages. Tocontrol downstream line turbulence, each stageabsorbs a portion of the pressure drop through its manymultiple orifices.

MegaStream plates are designed for each individualapplication, providing SPL reductions of up to 15 dBA.Depending on the type of gas and the pressure dropratio, these plates may require one to four stages.


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Table VI:MegaStream Diffuser Specifications

BodyStyle Flangeless wafer, outlet head(weld or flange connection),open shell (vent)

Inlet Size 1-42 inch (larger sizes availableupon request)

ANSI Rating 150, 300, 600, 1500, 2500

Flow Direction One way only

Materials of Carbon steel (standard),Construction stainless steel and other materials

available as required

GDS – Flowserve's standard model MegaStream diffuser.

MEGASTREAM DIFFUSERSLike the MegaStream plate, the MegaStream diffusercan also be used in series with any style of control valveto reduce the sound pressure level (up to 15 dBA) whileeliminating the need for expensive valve trim.

MegaStream diffusers share high pressure drops withthe control valve, yet control the SPL by passing theflow through many small openings to eliminate exces-sive turbulence and energy. Since correct hole size andspacing are critical in determining the performancecharacteristics of the diffuser, Flowserve custom-designs each diffuser for a particular application.

By design, the length of the diffuser and the number ofholes vary to accommodate the flow capacity required.Thus the capacity of the diffuser is significantly greaterthan the MegaStream plate. This also minimizes theuse of reducers and expanders.

Three standard diffuser models are available:

1. GDS – Flowserve’s standard model, which is in-stalled between the raised face flanges of the valveand line.

2. GDI – Similar to GDS but is designed to be weldedin-line or to mating flanges. Outlet is enlarged toeliminate a reducer.

3. GDV – Vent model installed for system dischargeto atmosphere.

IN-LINE SILENCERSFor venting applications and for applications beyondthe range of MegaStream plates and diffusers or Tiger-Tooth attenuators, Flowserve provides an in-linesilencer which may be installed separately or in serieswith one of the other devices. The Valtek silencerconsists of a series of tuned chambers and tubes filledwith sound absorbing material, and is designed forstaged pressure reduction. Because of its complicateddesign, Valtek silencers must be selected for a particu-lar application by Flowserve design engineers.

In-line silencer shown in series with MegaStream diffuser.


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E

C

D

E

C

C

E

D

Size Max Series 2 Maximum Weight150 300 600 900

1 36 11.0 279 3.4 1.5 3.4 1.5 3.4 1.5 3.4 1.52 141 17.5 445 9.3 4.2 9.3 4.2 9.3 4.2 12.9 5.93 313 17.5 445 18.2 8.3 18.2 8.3 22.4 10.2 31.7 14.44 544 32.5 826 30.6 13.9 30.6 13.9 39.5 17.9 57.4 26.06 1232 46.5 1181 76.0 34.5 76.0 34.5 124.0 56.2 154.0 69.98 2361 70.0 1778 113.0 51.3 139.0 63.0 254.0 115.2

10 3722 76.5 1943 173.0 78.5 337.0 152.9 453.0 205.412 5377 91.0 2311 249.0 112.9 508.0 230.414 6752 100.0 2540 319.0 144.7 662.0 300.316 8902 114.0 2896 413.0 187.3 761.0 345.218 11346 128.5 3264 597.0 270.8 1261.0 572.020 14100 143.0 3632 873.0 396.0 1698.0 770.224 20460 168.5 4280 1248.0 566.1

DimensionsMegaStream Diffuser

(in.) C V

Type GDS

C D1

Type GDI

(in.) C V

C D1 E3


1 36 17.0 432 3.5 89 13.1 5.9 13.1 5.9 13.1 5.9 13.1 5.92 141 25.5 648 4.5 114 29.6 13.4 29.6 13.4 29.6 13.4 33.2 15.13 313 34.5 876 6.6 168 71.1 32.3 71.1 32.3 75.3 34.2 84.6 38.44 544 44.0 1118 8.6 219 93.7 42.5 93.7 42.5 103.0 46.7 121.0 54.96 1232 55.0 1397 12.8 324 188.0 85.3 188.0 85.3 236.0 107.0 266.0 120.78 2361 80.0 2032 16.0 406 325.0 147.4 351.0 159.2 466.0 211.4

10 3722 87.0 2210 20.0 508 460.0 208.7 624.0 283.0 740.0 335.712 5377 104.0 2642 24.0 610 652.0 295.7 911.0 413.214 6752 115.0 2921 30.0 762 880.0 399.2 1223.0 554.716 8902 128.0 3251 36.0 914 1166.0 528.9 1514.0 686.718 11346 144.0 3658 36.0 914 1448.0 656.8 2112.0 958.020 14100 150.0 3810 42.0 1067 1978.0 897.2 2803.0 1271.4

Type GDV

(in.) C V

C E4


1 36 11.0 279 1.3 33 3.5 89 4.1 1.9 4.1 1.9 4.1 1.9 4.1 1.92 141 17.5 445 2.4 60 4.5 114 9.6 4.4 9.6 4.4 9.6 4.4 13.2 6.03 313 26.0 660 3.5 89 6.6 168 22.1 10.0 22.1 10.0 26.3 11.9 35.6 16.14 544 32.5 826 4.5 114 8.6 219 38.7 17.6 38.7 17.6 47.6 21.6 65.5 29.76 1232 46.5 1181 6.6 168 12.8 324 96.6 43.8 96.6 43.8 114.0 51.7 174.0 78.98 2361 70.0 1778 8.6 219 16.0 406 138.0 63.0 164.0 74.4 280.0 127.0

10 3722 76.5 1943 10.8 273 20.0 508 209.0 94.8 373.0 169.2 489.0 221.812 5377 91.0 2311 12.8 324 24.0 610 296.0 134.3 555.0 251.714 6752 100.0 2540 14.0 356 30.0 762 391.0 177.4 734.0 332.916 8902 114.0 2896 16.0 406 36.0 914 510.0 231.3 858.0 389.218 11346 128.5 3264 18.0 457 36.0 914 690.0 313.0 1345.0 610.120 14100 143.0 3632 20.0 508 42.0 1067 1003.0 455.0 1828.0 829.224 20460 168.5 4280 24.0 610 48.0 1219 1418.0 643.2

Notes: All dimensions are in inches/mm and weights are in lbs/kg and are for estimations only.(1) Actual diffuser diameter.(2) Series designates pressure rating of diffuser identical to pressure rating of same class flange.(3) Typical diameter. Pressure rating of head equal to schedule 40 pipe of same diameter.

Diffuser rating per note 2. E = 2D.(4) Typical diameter. Actual diameter established so that exit velocity < 400 ft./sec.See MegaStream control valve bulletin for one and two-stage MegaStream valve dimensions.Contact factory for Tiger-Tooth attenuator and in-line silencer dimensions.

Type GDS

Type GDI

Type GDV

Dia

met

er to

fit i

nsid

e fla

nge

bore


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A

B

A B(in.) 1 Stage 2 Stage 3 Stage 150 300 600

11/2 0.8 19 0.9 22 1.5 38 3.4 86 3.8 95 3.8 95

2 0.8 19 1.3 32 1.5 38 4.1 105 4.4 111 4.4 111

3 0.9 22 1.4 35 1.9 48 5.4 137 5.9 149 5.9 149

4 0.9 22 1.4 35 1.9 48 6.9 175 7.1 181 7.6 194

6 1.3 32 1.6 41 2.4 60 8.8 222 9.9 251 10.5 267

8 1.4 35 1.9 48 2.4 60 11.0 279 12.1 308 12.6 321

10 1.9 48 2.4 60 2.9 73 13.4 340 14.3 362 15.8 400

12 2.4 60 2.8 70 3.4 86 16.1 410 16.6 422 18.0 457

14 2.4 60 2.8 70 3.4 86 17.8 451 19.1 486 19.4 492

16 2.4 60 2.9 73 3.9 99 20.3 514 21.3 540 22.3 565

18 2.4 60 2.9 73 3.9 99 21.6 549 23.5 597 24.1 613

20 2.8 70 3.6 92 4.8 121 23.9 607 25.8 654 26.9 683

24 2.8 70 3.6 92 4.8 121 28.3 718 30.5 775 31.1 791

Rev. 1/94

Dimensions

MegaStream Plate Size

MegaStream Plate Dimensions (inches / mm)

©1994 Flowserve Corporation. Flowserve and Valtek-Kammer are registered trademarks of Flowserve Corporation.

Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, thisFlowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserveproducts should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial serviceconditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for allpossible applications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installa-tion, operation and maintenance of Flowserve products. The purchaser/user should read and understand the Installation OperationMaintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve products inconnection with the specific application.While the information and specifications contained presented in this literature are believed to be accurate, they are supplied for informativepurposes only and should not be considered certified or as a guarantee of satisfactory results by reliance thereon. Nothing containedherein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this product. BecauseFlowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein aresubject to change without notice. Should any question arise concerning these provisions, the purchaser/user should contact FlowserveCorporation at any of its worldwide operations or offices.

For more information, contact:For more information about Flowserve Corporation,contact www.flowserve.com or call USA 972 443 6500

Manufacturing Facilities

1350 N. Mt. Springs Prkwy.Springville, UT 84663Phone 801 489 8611Facsimile 801 489 3719

Manderscheidstr. 1945141 Essen, GermanyTelephone (49) 2 01 89 19 5Facsimile (49) 2 01 891 9600

Alläe du Quartz 1CH-2300 La Chaux-de-FondsSwitzerlandTelephone (41) 32 925 9700Facsimile (41) 32 926 5422

Alläe du Quartz 1CH-2300 La Chaux-de-FondsSwitzerlandTelephone (41) 32 925 9700Facsimile (41) 32 926 5422

Quick Response Centers

5114 Railroad StreetDeer Park, TX 77536 USATelephone 281 479 9500Facsimile 281 479 8511

104 Chelsea ParkwayBoothwyn, PA 19061 USATelephone 610 497 8600Facsimile 610 497 6680

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