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Tank Blanketing RegulatorsLow-Pressure Reducing Regulator

Type BR

Low-Pressure Relief Valve

Type BS

Description

Tank blanketing, or padding, is theprocess and practice of covering astoredcommodity,usuallyaliquid,withagas. It is thebestpreventionofandprotectionagainstexplosions.If the commodity is volatile or toxic,tank blanketing can prevent it fromharming workers, equipment and theenvironment. When the commodity isa foodorothersubstance,blanketingprotects it from oxidation or conta-mination though exposure to air ormoisture.

Inmost cases, tankblanketinggas ispure,drynitrogen.Blanketingcanmakeupthevolumeofliquiddisplaced in or out a tank, or itcanmakeupvolumecausedby ther-mal changes of the tank’s contents,preventingthecreationofavacuumorexcessoperatingpressure.

Highlights

■ Regulating range up to 4000 mbar / 60 psi

■ Sizes DN15 to DN 100 (1/2” to 4”)

■ Pressure resistance 10 bar

■ Back pressure resistance up to 4000 mbar/60 psi

■ Withstands full vacuum

■ Stainless steel regulators

■ Nickel alloy Regulators

■ PVDF regulators

■ Clean and sterile regulators

■ Maintenance friendly

■ ATEX II 2GD IIC

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Good installationBest installation Good installationBest installationGood installationBest installation Good installationBest installation

Good installationBest installation Good installationBest installation

Dimensions in mm

Inline Pattern

Type Body A ØC D E F

BR/BS15i A 130 160 30 66 125 4.1BR/BS25i A 160 200 36 75 125 6.5BR/BS50i A 230 300 54 105 148 18BR/BS25i C 160 200 41 83 125 6BR/BS50i C 230 300 70 145 148 17

Angle Pattern

Type Body A ØC D E F

BR/BS15e B 100 160 100 65 125 5.9BR/BS25e B 100 200 100 65 125 7.1BR/BS50e B 180 300 150 70 220 17BR/BS80e D 250 440 250 82 320 34BR/BS100e D 250 440 250 100 370 42

Weightinkg

Weightinkg

Technical Data Tank Blanketing Regulators

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Technical data Tightness / Adjustment

Inletpressure :16bar/300psi Seattightnessacc.toEN12266-1,leakingrateA,P12

(10bar/150psiforDN80/DN100 Flowcapacityforadjustment DN15/1/2”:0.5Nm3h

andforPVDFregulators)

DN25/1” :1Nm3/h

Backpressureresistance :4bar/60psi DN50/2” :2Nm3/h

Regulatingrangeofsprings :-200to+600mbar/-3to+9psi DN80/3” :5Nm3/h

Pilotregulatingrange :-200to+4000mbar/-3to+60psi DN100/4” :5Nm3/h

Certificates

Max.vacuum :Withstandsfullvacuum AccordingtoPressureEquipmentDirective :PED97/23/EG

Max.temp.FFKM(Kalrez®) :-20°Cto+160°C/-4°Fto+320°F ConformitystatementQS04ATEX2006 :II2GDIIC

Max.temp.FPM(Viton®) :-20°Cto+120°C/-4°Fto+250°F StatementofCompliance :US.FDA21CFR

Max.temp.PVDFregulator :-20°Cto+130°C/-4°Fto+260°F WorkCertificate :EN102043.1B

Installation

The recommended mounting for the low-pressure regulators is in a vertical line (see picture "best installation”). Lead sealed regulatorsare adjusted in this position. When they are mounted in a horizontal line, the set pressure will rise depending to the dimension of the regulator. Pressure regulators with set pressure lower than 10 mbar must be mounted as shown in the picture "best installation”.

Series BR Low Pressure Reducing Valve

Series BS Low Pressure Relief Valve

Flanges according DIN EN 1092-1:2201 PN 10/16 or ANSI 150lbs ASA B16.5-1961C Massive PVDF

A Cast B Bar Stock

D Bar Stock

supply process

process vent

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Reducing Regulator Function

Spring-loaded pressure reducing regulators are “relative pressure regulators”, designed tokeeptheprocesspressure“B”ataconstantlevel.Thenominalpressureissetbymeansofthesetscrew,locatedatthespringhousing.Whenatrest,theregulatorremainsinanopenposition.Whenthepressure“A”rises,pressure isreleasedthroughtheopenvalveseat“F”totheprocesssideofthevalveandthroughtheinternalfeedbackbore“E”underneaththediaphragm.Thiswill continue, until thediaphragm force “C” exceeds the spring force “D”,whiletheprocesspressure“B”rises.Thediaphragmisliftedandthevaleseat“F”closes.Intheeventthattheprocesspressure“B”dropsbelowthepreadjustednominalpressure,thespring force “D”presses thediaphragmdownwards, so that thevalveseat “F”opensandadmitsgasuntilpressureequalizationisreachedagain.

Relief Valve Function

Spring-loaded relief valvesare “relativepressure regulators”,designed tokeep theprocesspressure “A” at a constant level. The nominal pressure is set by means of the setscrew,locatedatthespringhousing.Whenatrest,theregulatorremainsinaclosedposition.Whenthe process pressure “A” increases, pressure is released through the internal feedbackbore “E” underneath thediaphragm. If thediaphragm force “C” exceeds the spring force“D” the valve seat “F” opens and the over pressure is discharged to the vent side “B”. Iftheprocesspressure “A”drops, thediaphragm force “C” is lowercompared to thespringforce“D”andthevalveseat“F”closes.Thepressureintheventlinecanbeatmosphericorvacuum.Withvacuumintheventlinetheflowcapacityoftheregulatorisincreased.

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Technical Data Tank Blanketing Regulators

1 Reducer clean design, size DN 25, angle pattern2 DIN flanges PN 16, seat diameter 6 mm, direct action, spring range 10 – 50 mbar3 Body stainless steel, trim parts stainless steel, seat o-ring material FFKM with FDA conformity, diaphragm PTFE virgin4 With pressure gauge union and pressure gauge, regulator adjusted and lead sealed

Codification Low Pressure Regulator

1. Function

BR Reducer

BRC ReducerClEAN

BRS ReducerSTERIl

… P PilotPressureDesign

… N NegativPressureDesign

BS BackPressureValve

BSC BackPressureValveClEAN

BSS BackPressureValveSTERIl

… P PilotPressureDesign

… N NegativPressureDesign

Size

15 DN15(1/2”)

25 DN25(1”)

50 DN50(2”)

80 DN80(3”)

100 DN100(4”)

Design

i Inlinepattern

e Anglepattern

2. Connection

D DINFlangesPN16/10

A ANSIFlanges150lbs

C1 ClampISO1127-1

C2 ClampDIN32676

C3 ClampOD/ASME

C4 ClampSMS

C5 FoodUnionDIN11851

G BSPthreadfem

N NPTthreadfem

X Special

Seat

(04,06,10,14,21,32) D Directactiondecoupled

(06,10,14,21,32) E Pressurecompensated

(06,10,14,21,32,42,67) R Directactioncoupled

(14,21,42,67,82) S Reliefseat

Spring

A 10to50mbar/0.15to6.75psi

B 20to150mbar/0.3to2.25psi

C 50to300mbar/0.75to4.5psi

H 100to600mbar/1.5to9psi

(up to DN 50)

L 0to10mbar/0to0.15psi

D –10to–50mbar/–0.15to0.75psi

E –30to–200mbar/–0.45to–3psi

T +10to–10mbar/+0.15to–0.15psi

J Withoutspring(Dome)

X Special

3. Body

S 316/316l(1.4408/1.4404)

H Nickelalloy

P PVDF

X Special

Trim Parts

S 316l(1.4404)

H Nickelalloy

P PVDF

X Special

Sitz O-Ring

K FFKM(Kalrez®6375)

V FPM(Viton®)

C FFKMFDA(Kalrez®6221)

X Special

Diaphragm

P PTFEFDA

V FPM

X Special

4. Accessories

V Pressuregaugefitting

M PressuregaugeØ63,SS

E Externalfeedback

H Heatingjacket

R Raincover

P Adjustedandleaded

A ATEXdesign

K Squareguidepin

L lockingscrewinstainlesssteel

D Flowlimitation

X Special

Examples:

1 2 3 4

BRC25e D06RA SSCP VMP

0.5 1 2 4 6 10 Seat Ø KvInlet pressure P1 in bar

Low Pressure Reducing Valves:

0.5 1 2 4 6 10 Seat Ø KvInlet pressure P1 in bar DN

172 228 380 630 855 1565 21mm 12

430 575 945 1590 1950 32mm 26

665 885 1470 1950 42mm 40

SetpressureP2

10to250mbar80(3")

172 228 380 630 855 1565 21mm 12

430 575 945 1590 1950 32mm 26

665 885 1470 1950 42mm 40

SetpressureP2

0.15to3psi80(3")

0.5 1 2 4 6 10 Seat d KvInlet pressure P1 in bar DN

430 575 945 1590 2160 3000 32mm 26

665 885 1470 2440 3000 42mm 40

1150 1480 2465 3000 67mm 80

SetpressureP2

10to250mbar100(4")

430 575 945 1590 2160 3000 32mm 26

665 885 1470 2440 3000 42mm 40

1150 1480 2465 3000 67mm 80

SetpressureP2

0.15to3psi100(4")

Velocity=<30m/s Flowvelocityexceeds100m/sinpiping

0.5 1 2 4 6 10 Seat Ø KvInlet pressure P1 in bar DN

9 13 22 32 55 100 4mm 0.7

22 31 43 65 105 192 6mm 1.2

46 65 110 200 250 10mm 3

90 125 200 250 14mm 5

SetpressureP2

10to250mbar25(1")

9 13 22 32 55 100 4mm 0.7

22 31 43 65 105 192 6mm 1.2

46 65 110 200 250 10mm 3

90 125 200 250 14mm 5

SetpressureP2

0.15to3psi25(1")

0.5 1 2 4 6 10 Seat Ø KvInlet pressure P1 in bar DN

46 65 110 200 280 510 10mm 3

94 125 208 345 470 850 14mm 5.5

172 228 380 630 850 21mm 12

430 600 850 32mm 26

SetpressureP2

10to250mbar50(2")

SetpressureP2

0.15to3psi50(2")

DN 15/25/50

Type BR15i

Type BR25i

Type BR50i

DN 25/50

Type BR25i

Type BR50i

DN 80/100

Type BR 80e

Type BR100e

DN 25/50

Type BR25e

Type BR50e

Velocity=>30m/sto100m/s

Pressure drop

Increaseto tightness

Setpoint

max. flow Flow

Example Diagramm Pressure Reducer

Inthereducingvalve,thepressure decrease withincreasing flow and afteradefinedpointtheflowistoohighandthepressuredrop down. This pheno-menon of P2 droppingbelow setpoint as flowincreases called „Droop“.Thisdropistheamountofdeviationfromsetpointatagivenflow,expressedasapercentageofsetpoint.This curve is importanttoauserbecause it indi-catesregulatingcapacity.

Performance Data Low Pressure Reducing Valves

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For set pressures lowerthan10mbarorwhenthepressure drop behind thepressure reducing valveexceeds the set pressure,the reducing valve mustbe equippedwith a exter-nal feedback line (externalfeedbackregistration).Thisis also recommended forhighflowcapacities.

External Feedback Line

AllflowratesinNm3/h(Air)

46 65 110 200 280 510 10mm 3

94 125 208 345 470 850 14mm 5.5

172 228 380 630 850 21mm 12

430 600 850 32mm 26

8.5 12 20 29 49 85 4mm 0.6

19.5 28 45 59 85 6mm 1

33 45 77 85 10mm 2

SetpressureP2

10to250mbar

8.5 12 20 29 49 85 4mm 0.6

19.5 28 45 59 85 6mm 1

33 45 77 85 10mm 2

SetpressureP2

0.15to3psi

DN

15(1/2")

15(1/2")

DN 7.5 15 30 60 90 150 Seat Ø KvInlet pressure P1 in psi

DN 7.5 15 30 60 90 150 Seat Ø KvInlet pressure P1 in psi

DN 7.5 15 30 60 90 150 Seat Ø KvInlet pressure P1 in psi

DN 7.5 15 30 60 90 150 Seat Ø KvInlet pressure P1 in psi

DN 7.5 15 30 60 90 150 Seat Ø KvInlet pressure P1 in psi

Set pressure P1 in psi 0.15 0.3 0.75 1.5 3 6 Seat Ø Kv DN

Low Pressure Relief Valves:

DN 15/25/50

Type BS15i

Type BS25i

Type BS50i

DN 25/50

Type BS25i

Type BS50i

DN 80/100

Type BS 80e

Type BS100e

DN 25/50

Type BS25e

Type BS50e

Example Diagramm Back Pressure Regulator

Inthebackpressurevalve,the pressure increasewith increasing flow. Assystempressureincreas-es,thereliefvalveopenswider. This allows morefluid to escape and pro-tects the system. Theincrease in pressureabove the relief setpointthatisrequiredtoproducemore flow through thereliefvalve.

Pressure

Increaseof pressure

Decrease to tightness

Setpoint

max. flow

Flow

Performance Data Low Pressure Relief Valves

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AllflowratesinNm3/h(Air)flowvelocity<30m/s flowvelocity>30m/sto70m/s

P2

Atmospheric

–0.15psidepression

10.5 14.5 21 30 46 55

12.5 17 23 32 47 5614mm 4 15

Atmospheric

–0.15psidepression

22 34 47 65 100 125

34 40 50 68 102 12621mm 9.5 25

Atmospheric

–0.15psidepression

105 140 210 300 460 560

140 165 230 315 470 56542mm 40 50

Atmospheric

–0.15psidepression

210 280 420 600 920 1120

280 330 460 630 940 113067mm 80 80

Atmospheric

–0.15psidepression

390 530 785 1130 1720 2100

530 630 865 1220 1765 212082mm 150 100

Design Features

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Standard Design

Application Forprocessesinthechemical-pharmaceuticalindustries, withoutsubstandardrequirement.

Example of uses Protectionagainstexplosion. Preventionofbuildinganexplosivemixtureofgasby exchangingtheatmosphericairwithaninertgas.

Design Inline-andanglepattern

Surface Withoutspecialtreatment

Complete drain No

Sterile Design

Application Dutiesinthepharmaceuticalindustriesandbiotecnical withextremelyhighdegreerequirementstosterility.

Example of uses Allprocessesandproceduresinsterilequality.

Design Anglepattern

Internal space Separatedprocess-andcontrolspace,nodeadspace.

Surface Areasincontactwithmedia<Ra0.6µmandelectropolished, externalelectropolishingasoption.

Complete drain Yes

CIP connection Ondemand

Clean Design

Application Forproceduresinthepharmaceuticalindustriesand foodproductionwithincreasedrequirementsconcerning surfacetreatment,deadspaceandcleaning.

Example of uses Protectionagainstoxidation. Thereplacementoftheatmosphericairbyaninertgas preventsthebuildingofanoxidizingambiance.

Design Anglepattern

Internal space Roundededges,minimizeddeadspace

Surface Roughnessforareasincontactwithmedia<Ra0.8µm, internalandexternalelectropolishingasoption.

Complete drain Yes

Examples of Use

Tank Blanketing Systems

Wheredoesblanketingtakeplace?Inallareaswhereinbatchprocessesproductsorliquidsarebeinghandled,storedandcoveredwithaninertatmosphere(mainlyN2).Howisblanketingaccomplished?Foroptimumperformancetherearetwopressureregulatorsrequired.Apressurereducingvalveforenteringthegas(inhale)andareliefvalveforthedischarginggas(exhale).Blanketingnormallytakesplaceinthepressurerange from10 to50mbar.We recommend tooperate the regulatorsadjustedandsealed, e. g. reducing valve at 15 mbar, relief valve at 40 mbar. The two functionpointsshouldbeasfarapartaspossibletoobtainawidepressurespreadwithouttheconsumptionofgas.Asaminimumpressurespreadwerecommend8mbar.Inordertoavoidtheentryofoxygenintothevessel(forsolvents),overpressureisnecessary.In the event that no gas discharge is wanted (handling of toxic products) negativepressuremustbekept.

Inerting With Overpressure / Pneumatic Transfer

Inertingmeanstheexchangeofthestandardatmospherewithanon-active(inert)gasatmosphere.Behindthediaphragmofspringloadedpressureregulatorsatmosphericpressureexists.Ifthespacebehindthediaphragmissealedoffandchargedwithapilotpressure,theregulatorwillnolongeruseatmosphereasreferencepointbutthepilotpressure(Pilotpressuredesign).Theexchangeofthegasesisaccelerated.Ifthereactorisinert,thepilotpressureisdisabledandthelowpressureregulatorsoperateautomatically in the blanketing mode (see blanketing systems). Beside blanketing,this design permits different other functions such as: Inerting with overpressure,pneumatictransferofproducts,blowthrough,blocking.

Inerting With Vacuum

Ifthereactorwithstandsvacuum,inertingcanbeaccomplishedwithnegativepressure.Withavacuumpump,80%ofthestandardatmosphereissuckedoff,theremainingpressure is 200 mbar abs. As a result, just 20 % oxygen molecules remain in thevessel.Afterwards, the reducedvolume is replacedwithNitrogenback to thepres-sure of 1000 mbar abs through the reducer. This dilution of the remaining oxygen(app. 1:5 per inerting cycle) is being continued until the rest oxygen content isbelowthepredeterminedvalue. If thereactor is inert,productioncanstart.The lowpressure regulators operate automatically in the blanketing mode (see blanketingsystems).

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Reducing Valve15 mbar

Reducing Valve15 mbar1015 mbar

Relief Valve40 mbar1040 mbar

Reducing Valve15 mbar Relief Valve

40 mbar

Vacuum

Pilot Pressure1000 mbar

Relief Valve 40 mbar

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Quality commitment "Made in Switzerland"

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For more than 50 years, the Swiss quality logo “Made in Switzerland“ stands for

precision and Top quality. The ZÜRCHER-TECHNIK pressure Regulators have been

developed and are being manufactured in Switzerland. We do believe in the

manufacturing location Switzerland, its competitive and know-how leadership.

Our Product Range in Medium Pressure Regulators

ww

w.2

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Pressureregulatorsformediumpressuresupto40bar.Thestandarddesignareinuseforallindustrialapplications.Thesanitarydesignregulatorsaresuitableforavarietyofapplicationsinthefood&beverage,pharmaceuticalandbiotechnologyindustries.Atypicaluseofthoseregulatorsisthepressureregulationofcleansteam.

The Zürcher-Technik pressure regulator knowledge, experienceandknow-howisaresultofmorethan30yearspressureregulatorproductionandmarketing.

Zürcher-Technik develops, designs and produces pressureregulatorsinSwitzerlandforglobalmarketinganddistribution.

The high demands and needs by the chemical-pharmaceuticalindustry have led to the development of precise, corrosion resi-stantandFDAconformingpressure regulators.Specialattentionherebywasgiventotherangeofblanketingapplications(mixers,tanks,centrifuges,containers,etc.)

Zürcher-Technikwelcomescompetitionandishappytomeettheirchallenge.Ourmission statement: In the long run, acompany'ssurvivalandwellbeingdependsonitscapabilitytocomeupwithmoreinnovativesolutionsthanitscompetitors.Qualityofourser-vice,highest levelorproduct reliability,dependableperformanceand customer satisfaction represent the key portion of our dailychallenge.