GEA Tuchenhagen VARIVENT® Valves

The core component for matrix-piped process plants

engineering for a better world GEA Mechanical Equipment

VARIVENT® Valves

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GEA Tuchenhagen

VARIVENT® valves are operationally reliable, easy to maintain, CIP/SIP-capable that altogether are essential

factors for continuous product quality.

Low operational maintenance and service costs ensure economical plant productivity.

The VARIVENT® system is built up in a modular structure and therefore offers high application flexibility,

efficiency for the plant user, optimised stock inventory and favourably-priced spare parts and low parts

diversity.

Many valve types are EHEDG certified and meet 3A standard.

VARIVENT® valves are characterised by their special sealing technique. The metallic stop of the valve disk

is the core element for a defined deformation of the seal. With this technique a longer service life in the

process plant is reached - leading to shorter downtimes and continuous production.

. . . are used for simpleshut-off at flow path inter-sections within the pipesystem. One seal is used onthe one-part valve disk forshutting-off two pipesagainst each other. In caseof sealing failure, control-led leakage drain is notprovided.

. . . are used for convergingmedia from two pipes intoone pipe (W-Valve), or fordiverting media from onepipe on to two pipes (X-Valve). Always one seal is used onthe one-part valve disk inorder to shut-off the pipesfrom each other (upper –central or lower – central). If the seal fails, the mediain the pipes may intermix.

VARIVENT® single seat shut-off valves . . . VARIVENT® single seat shuttle valves . . .

VARIVENT® Valves

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GEA Tuchenhagen

. . . are used for mixproofseparation of incompatiblemedia at flow path inter-sec-tions. In the closedposition of the valve (non-actuated position) alwaystwo seals are located bet-ween the two pipes. If oneof the seals fails, leakagemay directly drain to theopen via the therefore pro-vided leakage outlet of thevalve without intermixingwith the product being inthe second pipe.

. . . have a one-part valvedisk with a double seal.They are used for mixproofseparation of incompatiblemedia at flow path inter-sections within the pipesystem. Double seal valvesare the economical alterna-tive to the generally useddouble-seat valves. Thevalve`s isolation chamberis equipped with two rin-sing valves which are pro-vided for leakage detectionand cleaning of the isolati-on chamber itself.It is possible to clean the

isolation chamber both separately and during pipecleaning.

. . . are used for mixproofseparation of incompatiblemedia at flow path inter-sec-tions. In the closedposition of the valve (non-actuated position) alwaystwo seals are located bet-ween the two pipes. This valve type has a radialseat design. If one of the seals fails, lea-kage may directly drain tothe open via the thereforeprovided leakage outlet ofthe valve without inter-mixing with the productbeing in the second pipe.The valve is equipped witha balancer. The balancerprevents that the valve disk

is forced open in case of pressure hammers produced inthe pipe system.

. . .shows the same functi-ons as the mixproof valvetype D. In addition this valve isequipped with a balancer.The balancer prevents thatthe valve disk is forcedopen in case of pressurehammers produced in thepipe system.

VARIVENT® mixproof valves type R . . .

VARIVENT® mixproof valves type D . . .VARIVENT® double seal valves type C . . .

VARIVENT® mixproof valves type B . . .

VARIVENT® Valves

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GEA Tuchenhagen

. . . are used for mixproofshut-off at flow path inter-sections of two pipesystems. These valve haveno device for cleaning theisolation chamber. Theyare mainly used ascleaning and gas valves inCIP systems and gasblocks.

. . . are based on the VARIVENT® valve, type T. A special feature of thisvalve is that one of thevalve housings may bepushed out using a pig.This technique allows forthe recovery of high quali-ty products at the end of aprocess step and thus tominimise product residuesinside the pipe.

VARIVENT® mixproof valves type K . . . VARIVENT® mixproof shuttle valves type Y . . .. . . are used for divertingliquids in a pipe system,i.e. from one pipe on totwo pipes, with mixproofseparation between thecentral and the upper pipe. In the closed position ofthe valve (non-actuatedposi-tion) always two sealsare located between thetwo pipes (shut-off bet-ween central housing andupper housing). If one ofthe seals fails, leakage maydirectly drain to the openvia the therefore providedleakage outlet of the valvewithout inter-mixing withthe product being in thesecond pipe. For shut-off between the

central and the lower valve housing, only one seal is used. The VARIVENT® mixproof shuttle valve has been testedand approved by the Dairy Institut in Kiel, Germany.

. . . are used for mixproofshut-off between the tankand the pipe system. Theworking principle is com-parible to VARIVENT®

valve type R. The leakageoutlet is optimized for anupside down installation ofthe valve.

VARIVENT® mixproof tank bottom valves type T_R. . . VARIVENT® mixproof valves (pig-able) type L . . .

VARIVENT® Valves

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GEA Tuchenhagen

In the closed position the upper andthe lower valve housings are eachsealed by an independent valve disk

To open, the actuated lower valve disk(blue colour) is raised. The thrott linggap between the lower valve disk andthe seat ring minimises the switchingleakage that is drained pressureless tothe open through the valve stem. Afterwards, the isolation chamber bet-ween the upper double disk (green)and the lower valve disk is shut-off.

The upper double disk is entrained bythe actuated lower valve disk into thevalve´s open position. The valve isnow opened.

In the closed position the upper andthe lower valve housings are eachsealed by an independent valve disk

To open, the actuated lower valve disk(blue colour) is raised. The isolationchamber between the upper doubledisk (green) and the lower valve diskis shut-off, before the radial seal ofthe valve disk is leaving the seat ring;in this way switching leakage doesnot occur.

The upper double disk is entrained bythe actuated lower valve disk into thevalve´s open position. The valve isnow opened.

Switching positions at the example of an axial/radial sealing mixproof valve, type R, T and L

Switching positions at the example of an axial/axial sealing mixproof valve, type D, B and K

VARIVENT® Valves

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GEA Tuchenhagen

1. Amply sized multi-colour optical indicationhood on the top of theT.VIS® control moduleclearly indicates andvisible from all sides thevalve’s current status.

2. Splash-water proof con-trol module, connectedto the actuator withclamps is provided forthe protection of electro-nics.

3. Interactive feedback viathe integrated stroke travel measurement.

4. The whole controlmodule can be removedfor maintenance withoutdisconnecting the con-trol wiring or air line. Inthis way the allocationof the valve to themaster control systemremains unchanged.

5. A wide range of actua-tors is available to hand-le various process pres-sures and system airpressures. The actuatorfunction can be reversedon single seat valves.

6. The open lantern separa-tes the actuator from theproduct section of thevalve. It permits thevisual inspection of the

spindle seal and pre-vents possible heattransfer fom the valvebody to the actuator.

7. The machine rolledvalve spindle finish provides for excellentwiping action as it pas-ses through the seal andimproves the service lifeof the stem seal.

8. A variety of sealingmaterials is available tosatisfy food grade stan-dards.

9. Easy removal of productcontacted parts in onepiece from the top of thevalve.

10. The height of the pok-ket- free valve housingcorres-ponds to that ofthe connecting pipe, sothat smooth flow andfreedom from any deadspace are given, thussafely excluding oxidati-on damage and cleaningproblems.

11. The valve disks are, as amatter of principle,manufactured in a singlepiece.

12. The ball shaped valvehousing provides idealflow and CIP characteristics.

13. The valves can be sup-plied with butt-weldends or with removableconnections.

14. The metallic stop of thevalve disk achieves de -fined deformation of theseal, ensuring long seallife.

15. The special design of theseal groove in the valvedisk provides that theseal holds its locationagainst high flow veloci-ties and viscous liquids.The shape of the sealwas designed on thebasis of FEM.

16. A separate connection isused to supply the isola-tion with cleaningmedia.

17. The isolation chamber iscleaned via a radiallyacting spraying nozzlein the upper valve disk.

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The VARlVENT® valve is designed for process plants where product quality,

hygiene and operational safety demand the use of high quality components.

The VARlVENT® valve provides besides the below listed main design features,

also unique high quality valve technology. 3

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13

10

12

Single Seat Valve Type Nin open position

VARIVENT® Valves

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GEA Tuchenhagen

axial/radial sealing axial/axial sealing

Variants of valve seat sealing on the VARIVENT® mixproof valve

Constant compression seal, see 14.Diffusion of stress in the seal. The sealing

geometry was optimised by calculations based

on the FEM method.

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9

8

11

17

14

15

5

Mixproof Valve Type Din closed position

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VARIVENT® Valves

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GEA Tuchenhagen

Yes

Change-overfunction

YesSelection scheme for VARIVENT® valve types.The modular principle allows all basic elements to becom bined with each other, thus providing sufficient flexibilty for designing any pipe system. Check which valve type is the most suitable for your special application. The flow chart shows the way.

Shut-off function No

Yes Tank outlet

Yes

No

No

NoSterile products Yes

Yes

No

No

Product

No

YesResistant to pressurehammers

Yes

No Compact design

No

YesTank outlet

Mixproof

Yes

Two valve disks

STERICOM®

Valve T_ASTERICOM®

Valve N_AVARIVENT®

Valve N+UECOVENT®

Valve NVARIVENT®

Valve KVARIVENT®

Valve CVARIVENT®

Valve DVARIVENT®

Valve T_RVARIVENT®

Valve BVA

V

VARIVENT® Valves

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GEA Tuchenhagen

Yes Yes Yes

Safety functionSampling NoModulatingfunction

NoNo

No

Yes

Yes

NoSterile products

No

YesExcess pressure

Yes

NoCompact design

No

YesTÜV Type approved

Yes

NoMixproof

VARIVENT®

ShuttleValve Y

STERICOM®

ShuttleValve X_A

ECOVENT®

ShuttleValve W

VARIVENT®

ShuttleValve W or X

VARIVENT®

ControlValve A or S

VARIVENT®

SamplingValve IT

VARIVENT®

Vacuum-Valve V

VARIVENT®

OverflowValve Q

VARIVENT®

SafetyValve

Radial seat design

NT®

R

VARIVENT® Valves

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GEA Tuchenhagen

With its variable configurations the VARIVENT® System gives you highest flexibility with regard to integrating thevalves into your plant. This makes optimum piping with shortest product routes possible. Check which housing confi-guration is required for your application. The matrix below shows you what combination is feasible.

Valve type

Housing combinations

The VARIVENT® housing configuration with only four basic components allows any housing combination

which is technically feasible in combination with the valve inserts.

...L …T ...L …T …B …C …A …E

...K …V …P …O ...W …Y …X …U …M

W WK WV WP WO WW WY WX WU WM

X XW XY XX XU XM

Y YW YY YX YU YM

N NL NT NB NC NA NE

U UF UD UB UC UA UE

K KL KT KB KC KA KE

D DB DC DA DE

C CL CT

R RB RC RA RE

T TL TT

L LC LE

B BB BC BA BE

VARIVENT® Valves

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GEA Tuchenhagen

T.VIS® Control module with diver-se possibilities of pneumatic andelectric connections, as well asintegrated stroke

The two-position stop moves thevalve into two repeat able positi-ons.travel measurement.

Manual actuator

Lower sterile lock to protect theproduct chamber from the atmo-sphere.

Upper sterile lock to protect theproduct chamber from the atmosphere.

Leakage outlet connection for thedefined dis charge of leakingfluids and valve seat cleaningsolutions.

Valve position feedback in thelantern and for monitoring thelift stroke of the double-disk, ifprovided.

Standard actuator air-to-open spring-to-close.

The booster cylinder is used forapplications with low control airpressures.

Actuator air-to-open/air-to-close.

The lifting actuator is used fordefined lifting of valve disks forvalve seat cleaning.

Limit stop for defined adjust-ment of the opening and/or closing stroke length (for single-seat valves only).

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Components of the VARIVENT® modular system

VARIVENT® Valves

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GEA Tuchenhagen

VARIVENT® modular systemHigh flexibility of the VARIVENT® system offers clear advantages: Valve systems existing in process plants may beeasily modified or adapated without the need of changing the existing plant concept.

Pneumatic actuator

Lantern

Manual actuator

Damping cylinder with Bypass

Control system T.VIS®

Leakage connector (only for valves type D and Y)

Booster cylinder

Lifting actuator

Single seat valve insertsMixproofshuttle valve insert

Single seatshutlle valve inserts

Mixproof valve inserts

VARIVENT® Valves

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GEA Tuchenhagen

T.VIS®, the GEA Tuchenhagen Valve Information SystemGEA Tuchenhagen Feedback Systems M-1 and A-8 combine modern valve design with innovative technology. Theystand out by simple concepts for installation, operation and maintenance and thus facilitate operational processes. The T.VIS® series is the optimal solution for the constantly increasing demands made on control systems in modernproduction plants. The use of T.VIS® series helps the user reliably to lower operating costs.

T.VIS® shows clearly the valve status T.VIS® Feedback Systems (M-1 and A-8) are equipped with a large-sized optical round flashing indicator on the top of the T.VIS® con-trol module. Multicolour light emitting diodes show the user clearlyfrom afar the current state of the valve! Depending on the valve type, the following states can be signalled:- Non-actuated position (green)- Actuated position (yellow)- Seat lift activated (on mixproof valves )

(green/yellow slow flashing)- Request for maintenance (red flashing)- Error (red)- LEFF® function active (yellow/green quick flashing)

T.VIS® M-1 T.VIS® A-8

T.VIS® reacts with flexibilityThe modular structure allows in addition the two system variantsfor flexible equipment of the feedback system in order to fulfil indi-vidual requirements (e.g. type of interface modules, number of sole-noid valves etc.). Expansion and modification, e.g. the change frombinary data exchange to a bus system are easily achieved byexchange of single modules without the need of exchanging thecomplete feedback system.

T.VIS® is tailored to customers‘ requirements Multiple requirements made on components and control systemsdemand flexible feedback technology that responds to individualcustomers‘ requirements by tailored solutions. This is an ambitiousaim that T.VIS® Feedback Systems fully meet! The T.VIS® seriesintegrates two different systems for feedback of the valve position. The T.VIS® A-8 is a feedback system of the next generation withinnovative path measurement technology. The intelligent techniqueof this feedback system reduces not only the expenditure for instal-lation, operation and maintenance, but significantly lowers the ope-rating costs by use of the LEFF® Function!T.VIS® M-1 equipped with the proven sensor module combines alladvantages of this technology with the advantages of the T.VIS®

design. In this way the T.VIS® series responds to the different customers‘requirements and offers optimal solutions.

VARIVENT® Valves

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GEA Tuchenhagen

• The upper and lower valve housings are each fittedwith a valve seat for independent shut-off.

• Leakage of liquids from one pipe into the other issafely excluded.

• Any defects on valve disk seals are visible at the open leakage outlet.

• Should seal damage occur, the leaking fluid flowssafely to the atmosphere by gravity.

• Cleaning solution is supplied to the isolation chambervia a separate CIP connection.

• The cleaning solution is sprayed inside the isolationchamber that is located between the two valve disksthrough a ring nozzle, which remains pressure free atall times. The used solution drains safely to the openvia the outlet pipe.

• The isolation chamber can be cleaned independently ofthe valve position.

Schematic diagram

Function characteristic of VARIVENT® mixproof valves

Mixproof Block & Bleed

• Reduced number of components • Low space requirement• Easy to maintain, less labour input• Only one electrical actua tion signal• No pockets• The leakage outlet system never conveys product • Reliable cleaning of the isloation chamber • The isolation chamber can be cleaned without liquid

pressure build-up, independently of the plant statusand the open or closed position of the valve

Advantages of the mixproof technology over the traditional block & bleed design:

VARIVENT® Valves

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GEA Tuchenhagen

Technical data

Material

Product contact parts (standard)Housing 1.4404 (AISI 316 L)Inside Ra ≤ 0.8 µmOutside matt finishInternals 1.4404 (AISI 316 L)

Non-product contact parts1.4301 (AISI 304)Surface matt finish

SealsStandard EPDM (FDA)Operating temp. 135° CSterilizing temp. 150° C (short time)optional: FKM (FDA), HNBR (FDA)other materials on request

Operating pressuremax. 10 bar, higher pressures upon request

Control airmin. 4, max. 8 bar

Metricas per DIN 11850DN 10, 15, 25, 40, 50 wall thickness, class 2DN 65, 80, 100, 125, 150 wall thickness, class 2

Inch ODas per ISO 2037/BS 4825, Part 11", 11/2", 2", 21/2", 3" wall thickness 1.6 mm4" wall thickness 2.0 mm

Inch IPSas per IPS, Schedule 52" wall thickness 2.0 mm3" wall thickness 2.3 mm4" wall thickness 2.3 mm6" wall thickness 2.7 mm

VARIVENT® Valves are available with the following pipe connection sizes:

610e

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2013

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GEA Tuchenhagen GmbH

Am Industriepark 2-10, 21514 Büchen, GermanyPhone +49-4155 49-0, Fax +49-4155 49-2423sales.geatuchenhagen@gea.com, www.gea.com