Comeval UNIFLOW DP Series Installation guide

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
Page 1
IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
INSTALLATION, OPERATING
AND MAINTENANCE MANUAL
DUAL PLATE CHECK VALVES
Contents
1. GENERAL INFORMATION ON THE MANUAL..............2
2. NOTES ON POSSIBLE DANGERS................................2
2.1Signicanceofsymbols ..............................................2
2.2 Explanatory notes on safety information.....................2
3. PRESERVATION, STORAGE AND TRANSPORT .........2
4. DESCRIPTION ................................................................2
4.1 General Description / Operating principles .................2
4.2 Area of Application ......................................................2
4.3 Technical data – remarks ............................................2
4.4 Marking/nameplate .....................................................3
4.5 CE marking. ................................................................3
5. INSTALLATION...............................................................3
5.1 General remarks on installation ..................................3
5.2 Requirements at the place of installation ....................4
6. COMMISSIONING...........................................................4
7. CARE AND MAINTENANCE ..........................................4
8. DISMANTLING THE VALVE ...........................................5
9. GOODS RETURN & DISPOSAL ...................................5
10. WARRANTY / GUARANTEE........................................5
11. PARTS LIST..................................................................6
12. ANNEX..........................................................................6
12.1 Declaration of Conformity .........................................6
12.2 Data Sheet................................................................6
Series UNIFLOW DP Series UNIFLOW DC

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
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IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
1. GENERAL INFORMATION ON THE MANUAL
-ThisManualprovidesinformationonsafelyusingtheproduct,beingbindingforpreservation,storage,handling,trans-
port,installation,commissioning,operation,maintenance,repairanddisposal,andmustbethoroughlyobservedatany
step.
-PleasecontactthesupplierorthemanufacturerincaseofissueswhichcannotbesolvedbyreferencetothisManual.
-AnydeviationfromthisManualandsoundengineeringpracticeormodicationontheproductshallbenotiedtoma-
nufacturer for advice or approval.
-Inaddition,regionalsafetyrequirementsmustbealwaysappliedandobservedatanystep.
-All the work related to the product must be carried out, supervised and inspected by specialist personnel. It is the
owner’sresponsibilitytodeneareasofresponsibilityandcompetenceandtoensurethepropermonitoring.
- This Manual is in accordance with Directive 2014/68/EU on Pressure Equipment (PED).
-ForATEXapplications,pleaserefertoATEXSpecicinstructions.
-Themanufacturerreservestherighttomaketechnicalmodicationsatanytime.
2. NOTES ON POSSIBLE DANGERS
2.1Signicanceofsymbols
ATTENTION!
...
Warning of general danger
2.2Explanatorynotesonsafetyinformation
In this Manual dangers, risks and items of safety information are highlighted to attract special attention.
Informationmarkedwiththesymbolabovedescribespractices,whichiffailtocomplywith,canresultinseriousinjuryor
danger of death for users or third parties or in material damage to the system or the environment. It is vital to comply with
these practices and to monitor compliance.
TherestofinformationnotspecicallyemphasizedinthisManual,alongwithDataSheetandproductmarking,mustalso
beobservedandcompliedwithforsafelyusingtheproduct.
3. PRESERVATION, STORAGE AND TRANSPORT
ATTENTION!
- Protect against external force (impacts, vibrations, etc.).
- Allow only skilled personnel; suitable handling and lifting equipment must be used. See Data Sheet for weights or
consult manufacturer.
- Always use suitable protection equipment, and minimize the use of human body force at any step to avoid injuries.
- There is a risk of body member (hand, nger, arm…) crushed against any other solid element (wall, pipe, oor, etc.)
during handling. Take this into account and handle with care.
- There is a crushing hazard between the plates (or discs) and the seat. Ensure the plates are in rest position in case
a hand is introduced inside the valve.
- Check correct position of nameplate and handle with care to avoid personnel cuttings.
- Use proper packing for transportation.
-Keepstorageprotectionbeforeinstallation.
- Keep exposed machined surfaces cleaned and greased when necessary. In order to prevent damage, corrosion or
rust on the surface, avoid extreme temperatures (keep at 5ºC to 50ºC), avoid high environmental humidity or corrosive
environment.Keepthevalvesawayfromdirectsunlight,dust,amesorrain.ProtectrubbersalsoagainstUVlight.Do
notpileupexcessiveweight.Incaseofseverebumpinginspectthematerialforanydamageandreplaceifnecessary.
4. DESCRIPTION
4.1GeneralDescription/Operatingprinciples
Dual Plate Check Valves use two half-sphere discs or plates and a connecting hinge to create a closure element that
collapseswhenpositiveowexists,andfoldsbacktoafullcirculardiscandcloseagainstapressurereversal.Discsare
preloadedwithspringsthatfavortheclosingofthevalvewhennopositiveow.
ValvediagramwithpartscanbeseenatthelastpageoftheManual.
4.2AreaofApplication
DualPlateCheckValvesarefeaturedasalight,compactandeconomicanti-returndevicetobeusedonindustrialand
wastetreatmentplants.Itswaferorlugdesignsuitabletoinstallationbetweenangesmakesthesevalvesquiteaprime
optionespeciallyonlargesizes.
4.3Technicaldata–remarks
For data such as main features, duties/limits of use, dimensions, weights, etc. refer also to Data Sheet.

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
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IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
4.4Marking/nameplate
Nameplate description of the valve:
4.5CEmarking.
5. INSTALLATION
5.1Generalremarksoninstallation
Thefollowingpointsshouldbetakenintoaccountinadditiontothegeneralprinciplesgoverninginstallationwork:
ATTENTION!
- Remove remaining packing/storage protection if present.
- The interior of the valve and the pipeline must be free of foreign particles.
- Follow the arrow in the body for normal ow direction for installation. If the valve is in horizontal pipeline, the shaft
must be in the vertical position for correct operation.
- Lay pipelines such that damaging transverse, bending and torsional forces are avoided.
- Protect valves from dirt during construction work.
- Protect the valve soft parts, if any, from heating caused by welding works at the plant during commissioning.
- Suitable materials handling and lifting equipment should be used for assembly work. During assembly work, ensu-
re that the valve is xed adequately. See data sheet for weights.
- The valves can be assembled vertically on horizontal pipeline or horizontally on vertical pipeline with normal ow
upwards.
- You must only operate the unmounted valve while observing all the safety measures.
- Avoid mechanical damage to the seat during handling, storage and installation.
- There is a crushing hazard between the discs or plates and the seat. Ensure the discs are in rest position in case
a hand is introduced inside the valve.
-Installthevalvesalwaysbetweenanges,usingsuitablegasketsprovidedwiththevalve.Besurethatthecontact
facesarefreeofimpuritiesoruidresiduesthatmaycompromisethetightness.
-Inordertotawafertypevalvebetweenanges,centrethevalvebetweenanges,insertoneortwostudbolts
dependingonthesizeandtightenthemwithnutswithoutforcing.Oncethevalvepreliminarytted,inserttherestof
studbolts.Tightennutsdiagonallyandgradually.Tightenagainduringstart-upifnecessary.Forlugtype,procedure
issimilarbutallholesofthevalvearethreaded,sothatthreadedboltsareusedinsteadofstudboltsandnuts.Valve
shouldtsmoothlybetweenangeswithoutbuildinganytension.
DN≤25 DN>25
Mark Description
CE-Marking
NB Numberofnotifybody
EAC marking (compliance with
TR/CU 032/2013 & TR CU 010/2011)
Manufacturer logo
Explosion protected mark for EU free
circulation (see separate instructions for code)
www.comeval.es Websiteofmanufacturer
UNIFLOW® Brand
PED 2014/68/EU Directive 2014/68/EU
FIG. Valve code*
SEP Sound Engineering Practice
Y.20VV Manufacturing year
SN: VVZZZZZ-N Batch/Serialno.
SIZE Valvesize
CLASS Valve class
B Bodymaterial
STD Main manufacturing standard
D Disc material
S Seat material
PSmax Max. pressure
TS Max. temperature at max. pressure
PS Max. pressure at max. temperature
TSmax Max. temperature
* See coding system on Data Sheet.

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
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IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
5.2Requirementsattheplaceofinstallation
-Downstreamfromadisruptiveelement(pump,valve,elbow,pipereduction)leaveasmuchdistanceaspossible;mini-
mum distance recommended: 6 times the valve diameter (6xDN).
- Upstream from a disruptive element leave at least a distance of 2xDN.
- Aggressive environmental conditions may reduce the life span of the product. Consider special construction/protective
measures in such a case.
-Considertheinteractionbetweenthesystemandtheequipment.Foreseeelementstoabsorbvibrations,pipedilata-
tions, guides, anchoring and proper support according to the weight of the components.
-Thesystemandoperationprotocolshouldbeconceivedinsuchawaytoavoidhighvelocities.Preventpulsingowor
water hammers, which are very harmful for valves and the rest of the components.
- Flooding of the product is not recommended.
- Allow enough space for valve installation, operation and maintenance.
-Itisrecommendedtoinstallapropersizedmeshstrainerupstreamthevalveinordertoprotectseatingsurfacesfrom
abrasionorerosionthatcouldleadtoseatleakage.
-Planners/constructioncompaniesortheownerareresponsibleforpositioningandinstallingproducts.
6. COMMISSIONING
ATTENTION!
- Before commissioning the valve, check the material, pressure, temperature, ow direction and other essential
parameters. Always use the product within the scope of intended service and operating duties.
- Before commissioning, make sure above chapters have been throughly followed.
- It is essential to ush the pipe system thoroughly to eliminate all the particles and impurities which could remain in
the pipes and particularly welding residue, chips, tool remains, etc. that could damage the equipment during start-
up. Ensure that during cleaning of the pipe system, any chemicals used and temperature are compatible with the
valve construction.
- Regional safety instructions should be adhered to.
- Temperatures above 50ºC or below 0ºC may cause personnel injuries if valves are touched. Ensure that the
corresponding warning signs are displayed on the valve or surrounding area, or isolate the equipment in case of
danger.
- Before commissioning a new plant or restarting it after repairs or modication, always ensure that:
- All work has been completed correctly!
- The valve is in the correct position for its function.
- Safety devices have been attached!
- Ensure valve surface is in good condition and retouch coating protection when needed.
-Thelling,warming-upandstarting-upofthesystemshallbegradualsoastoavoidanyinadmissiblestress.Checkfor
tightness in valve connections and retighten crosswise and gradually if necessary until leakage elimination.
7. CARE AND MAINTENANCE
Theoperatormustdenemaintenanceandmaintenance-intervalstomeetrequirements.
-Checkforbodyandseattightnessandvalvecorrectoperation.
ATTENTION!
- Before disassembling the valve, note chapters 8 & 9.
- There is a crushing hazard between the plates and the seat. Ensure the plates are in rest position in case a hand
is introduced inside the valve.
After any maintenance work please refer to chapters 5 and 6 for installation / commissioning.
RecommendedSpareparts:
Use only original spare parts.
Typeandnumberofeachspareparttobestoredaccordingtomanyfactors:servicelevel,valvesquantity,etc.Inmany
cases a good choice is to keep complete valves as spare part.

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
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IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
8. DISMANTLING THE VALVE
ATTENTION!
The following points must be observed:
- Pressureless pipe system.
- Medium must be cool.
- Plant must be drained.
- Purge pipe systems in case of toxic, corrosive, ammable or caustic media.
9. GOODS RETURN & DISPOSAL
-Foranyreturnedgoods,theissuingcompanymustprovideinformationinwrittenonanyhazardsandtheprecaution
in case of potentially polluting or harmful residues, or any mechanical damage that could present a health, safety or
environmentalrisk, as enforced by EU Health, Safety and Environment Law,including the Safety Data Sheet of the
substancesidentiedaspotentiallyhazardous.
-Valvesarerecyclableandnotexpectedhazardtotheenvironment,withtheexceptionofsoftparts(PTFEandrubber
compounds)thatshouldbedisposedseparatelyonlybyapprovedprocedure,andnoincinerationispermitted.
10. WARRANTY / GUARANTEE
-Theextentandperiodofwarrantycoverarespeciedinthe“GeneralSalesTerms”ofCOMEVALVALVESYSTEMS
validatthetimeofdeliveryor,bywayofdeparture,inthecontractofsaleitself.
-Weguaranteefreedomoffaultsincompliancewithstate-of-the-arttechnologyandtheconrmedapplication.
- No warranty claims are accepted for any damage caused as the result of incorrect handling or disregard of operating
and installation instructions, datasheets and relevant regulations.
- This warranty also does not cover any damage which occurs during operation under conditions deviating from those
laiddownbyspecicationsorotheragreements.
-Justiedcomplaintswillbeeliminatedbyrepaircarriedoutbyusorbyaspecialistappointedbyus.
-Noclaimswillbeacceptedbeyondthescopeofthiswarranty.Therighttoreplacementdeliveryisexcluded.
- The warranty shall not cover maintenance work.
- Our guarantee coverage does not cover for any commissioning, maintenance or installation of the product or external
parts.
-Ourguaranteedoesnotcoverproductsprovedtohavebeentamperedwithorfaultedbymaterialwearandtear.
-ThePurchaserisresponsibleforcheckingthattheincomingproductisreceivedingoodconditionandconformstothe
orderedspecications.Incaseofdamagecausedduringtransititisnecessarytoimmediatelycomplaintothecarrier
within 24 hours. After this time carriers could not assume the derived costs. In case of any deviation in relation to order
specications,pleasecontactus.
COMEVALVALVESYSTEMS,S.L.yCIA.,Soc.Comanditaria
Les Rotes, 15 46540 El Puig (Valencia) España
Phone[phone] ·Fax[phone]
E-mail[email protected] -www.comeval.es

©COMEVAL VALVE SYSTEMS Technical Dept. Ref. IOM - DUAL PLATE CHECK VALVES, UNIFLOW DC/DP - Ed.20/07 Comeval Valve Systems reserves the right to alter any technical data contained in this manual without prior notice. Regularly updated data on www.comeval.es
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IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
11. PARTS LIST
Nº PART
1Body
2 Seat
3 Disc
4 Stop Pin
5 Spring
6BearingWasher
7BearingWasher
8 Hinge Pin
9 Gasket
10 Position Plug
11 Eyebolt
12. ANNEX
12.1 DeclarationofConformity
12.2 DataSheet
Nº PART
1Body
2 Seat
3 Disc
4 Spring
5 Retainer