1001+1002/03.08/E All data in this literature are subject to change without notice. Tank Blanketing Regulators Low-Pressure Reducing Regulator Type BR Low-Pressure Relief Valve Type BS Description Tank blanketing, or padding, is the process and practice of covering a stored commodity, usually a liquid, with a gas. It is the best prevention of and protection against explosions. If the commodity is volatile or toxic, tank blanketing can prevent it from harming workers, equipment and the environment. When the commodity is a food or other substance, blanketing protects it from oxidation or conta- mination though exposure to air or moisture. In most cases, tank blanketing gas is pure, dry nitrogen. Blanketing can make up the volume of liquid displaced in or out a tank, or it can make up volume caused by ther- mal changes of the tank’s contents, preventing the creation of a vacuum or excess operating pressure. 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 zürcher-technik tel. +41 (0)61 975 10 10 ag für industrietechnik fax +41 (0)61 975 10 50 ch-4450 sissach www.zuercher.ch neumattstrasse 6 [email protected]
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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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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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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.
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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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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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.