DUV-C3 6-Seiter engl. ok (Page 6) - Unitecnounitecno.es/wp-content/uploads/2015/05/by-pass-de-turbina.pdf · THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS ... 2000,TRD and also international

WELLAND & TUXHORN AGA R M A T U R E N - U N D M A S C H I N E N F A B R I K

STEAM CONVERTING VALVES

for Power Stations and Industrial Plants

Type DUV-C3

STEAM INLET PHASE

1 When the perforated cage trim rises, steam enters the

interior by passing through the holes of the 1st stage.

2 This special amount of steam is directed to the motive

steam cooler. The integrated steam atomizer is supplied

by motive steam via radial holes in the cooling water

lance. Only when the required amount of motive steam

is passed the 2nd stage will be released. After the motive

steam passes through the atomizer, it will travel down-

stream to the temperature sensor which will open the

cooling water control valve. This insures that you always

have atomizing steam before cooling water is injected.

PRESSURE REDUCTION

3 As the perforated cylinder rises, the

precise holes of the trim are released in

accordance with the required opening

characteristic. The unbored extension of

the perforated cage trim will simultaneous-

ly release the holes of the throttle cylinder (the 2nd stage).

The pressure or flow control is taken over by the perforated

cage trim.

OUTLET PHASE

4 The cooling water will be atomised by the kinetic

energy of the motive steam and the droplets will

be spontaneously evaporated. Pressure reduction and

desuperheating are complete. Depending on the

pressure drop an extension with throttle discs can be

fitted at the valve outlet to reduce the noise level

and velocity of steam.

FORM FOLLOWS FUNCTION.Pe r fe c t Co n t ro l a n d Re l i a b l e O p e rat i o n .

Type DUV-C3

Technical data

Nominal size

Materials

End connection

min. pressure ratio1) p2/p1

Nominal pressure

Seat-plug-seal

Characteristic

Pressure reduction

Rangeability

Inlet

DN 80 to 500 / 3” to 20”

WN 1.0460/A 105 · WN 1.5415 · WN 1.7335/A 182 F12WN 1.7380/A 182 F22 · WN 1.4903/A 182 F912)

Welding ends in all versions

3-stages: < 0,25 · 4-stages: < 0,15

Metal sealing · Leakage Class IV und V

20% equal percentage rest linear

Perforated cage trim provides controlled pressure reduction in two stagesadditionally with throttle cylinders and throttle discs

1 : 50

Outlet

DN 100 to 1600 / 4” to 64”

PN 16 to 630 Class 150 to 2500 (4500) PN 16 to 100 Class 150 to 900

1) For different pressure ratios, please contact Welland & Tuxhorn 2) On request

1 2 3


TECHNICAL INFORMATIONSFor further information please see our detailed data sheets. *

* Technical alteration reserved.

KVS and CV values available

KVS

CV

Seat-Ø

Travel

Flow area

1st stage cm2

in2

2nd stage cm2

in2

mm

mm

23

26,9

45

35

8

1,24

14

2,17

30,5

35,7

55

40

10,5

1,63

18

2,79

52

60,8

65

50

18

2,79

32,5

5,04

85,5

100

80

60

29,5

4,60

52

8,06

112

131

90

75

38,5

5,97

68

10,54

161

188

110

75

55,5

8,60

97

15,03

252

294,8

135

100

87

13,48

152

23,55

374

437,6

160

120

129

19,99

225

34,86

441

516

180

120

152

23,55

268

41,52

490

573,3

200

120

169

26,2

298

46,19

580

678

230

150

200

30,99

350

54,23

673

787

260

150

232

35,95

405

62,75


HIGHEST AVAILABIL ITY,

RANGEABIL ITY

AND OPERABIL ITY

• Optimum steam conversion over the whole load range through integrated motive steam cooler

• Optimum Water-Steam mixing in the shortest downstream distance

• Fast response even at partial loads

• Low noise and vibration steam conversation through internals and downstream silencer

• All wearing parts are replaceable in the field

2) On request

Materials (Standard version)

Nominal pressure

Body

Seat and plug

Guide bushing

Stuffing box

Body gasket

Inlet

PN 16 to 630 · Class 150 to 2500 (4500)

WN 1.0460/A 105 · WN 1.5415 · WN 1.7335/A 182 F12WN 1.7380/A 182 F22 · WN 1.4903/A 182 F91 2)

WN 1.4122

WN 1.7380

Pure graphite

Grooved gasket

Outlet

PN 16 to 100 · Class 150 to 900

4

Steam pipings:No normal bends or three-dimensional bends,

immediately in front of or behind the valve.

• Guide values for straight lengths of pipe

work are:

- Upstream line approx. 5 dia.,

minimum approx. 2 – 5 m

acc. to nominal size

- Downstream line approx. 10 dia.,

minimum approx. 2 – 5 m

acc. to nominal size

• The upstream line should have a slope

against the direction of flow of approximately

100: 1 to 200: 1. A properly sized drain should

be installed at the lowest point.

• Take care to avoid the possible accumulation

of condensation as damage may occur to the

pipe and valve from water hammer and erosion.

Warming-up and heating lines prevent the

formation of condensation and reduce critical

thermal stresses during start-up and shut-

down. Remember that continuous operation

produces little condensation, whereas frequent

starting and stopping produces a great deal.

• Please follow the recommended start-up

curves. Otherwise there is a risk of thermal

stress. Longitudinal expansion should be

brought about slowly.

• Arrangement of steam converting valve and

cooling water control valve close together; the

desuperheating cooling water control valve

should be placed lower than the injection

point of the steam converting valve.

• Vertical spindle for easy maintenance there-

fore shortened assembly time. Desuperheating

water supply through symmetrically rising

pipes. They ensure a continuous and constant

supply of water to the injection point in the

converting valve; in the case of operation

shutdown, they prevent the cooling water

pipes from draining. Drain line at the lowest

point in the system.

Desuperheating water lines:Desuperheating water lines have to be installed

with enough flexibility to accommodate

relative movement between the steam line

system and the water line system. The thermo

sensors have to be mounted into the straight

downstream pipe, a min. of 5 - 8 m behind the

valve, in horizontal exhaust steam pipes, in the

4 or 8 o'clock positions.

It is well-known that not all of these pointscan always be realized in practice. Shortage of available space frequently means thatcompromises must be made.Therefore contact our engineers in time todevelop the best solution for your needs.

A steam converting station is comprised of both the steamconverting valve, and the associated cooling water controlvalve. The coordinated feed forward temperature design ofthese two components is critical to proper operation of the system.

FLEXIB IL ITY IN MOTION.Actuator selection: electric, hydraulic, pneumatic.

SAFETY F IRST.Customized installation / operation instructions for highest availability.


MADE IN GERMANY.You will get a top product made by German valve specialists!

OUR PHILOSOPHY

Control valves are inserted as a correcting element

inside of a pressure, temperature, flow, or level control

circuit, in power plants and industrial plants.

For these applications, a high amount of precision, work-

manship and a long lifetime are required. For more than

100 years we have been gaining experience, practical

and theoretical, together with renowned power station

engineers and users, as well as technical and scientific

institutes.

From the smallest to the biggest control valve, used in a

power station, the sturdy, strong, and solid construction

ensures optimal performance and operating capacity.

Our special control valves are successfully operating

worldwide!

OUR QUALITY

The constantly high product quality is the result of a

reasoned concept: We have implemented a multitude of

quality assurance measures: Beginning with the

continuous checking of drawings and manufacturing,

followed by strict material inspections, surface crack

detection, radiographic testing and ultrasonic testing,

and ending with final pressure and tightness tests,

supported by corresponding documentation.

We fulfil all regulations according to DIN, EN, VdTÜV,

AD-2000, TRD and also foreign regulations and

standards as ASME, ANSI and IBR.

Our quality assurance system is approved according to

the following regulations: DIN EN ISO 9001: 2000, Guide

line 27/23 EG, KTA 1401 und ASME.

Our control valves have been tested and approved by

all well-known acceptance authorities, such as TÜV,

German Lloyd, Brit. Lloyd, Lloyd's Register of Shipping

and Norske Veritas.

OUR SERVICE

Also, after delivery, an experienced team of service

engineers will be ready to provide assistance during

the start-up period, or to carry out routine inspections.

An overhauling department integrated in the manu-

facturing department is at your disposal. Not only do

we test on further usability and overhaul professionally,

we can also incorporate any new design innovations

into your system.

Should you wish to know more about this, please contact us. Our engineers and technicians are lookingforward with pleasure to having a detailed discussionwith you.

Gütersloher Straße 257

D-33649 Bielefeld

Tel. +49 (0)521 9418-0

Fax +49 (0)521 9418-170, -156

www.welland-tuxhorn.de

[email protected]

CCPP Paka, Malaysia© Siemens Press Picture

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THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

Steam Converting Valvesfor Power Stations and Industrial Plants

Type DUV-E20


Made in Germany.You will get a top product made by German valve specialists!

OUR PHILOSOPHYControl valves are inserted as a correcting element inside ofa pressure, temperature, flow, or level control circuit, inpower plants and industrial plants.For these applications, a high amount of precision, work-manship and a long lifetime are required. For more than 100years we have been gaining experience, practical and theo-retical, together with renowned power station engineersand users, as well as technical and scientific institutes.From the smallest to the biggest control valve used in apower station, the sturdy, strong, and solid constructionensures optimal performance and operating capacity.Our special control valves are successfully operating world-wide!

OUR QUALITYThe constantly high product quality is the result of a rea-soned concept: We have implemented a multitude of quali-ty assurance measures: Beginning with the continuouschecking of drawings and manufacturing, followed by strictmaterial inspections, surface crack detection, radiographictesting and ultrasonic testing, and ending with final pres-sure and tightness tests, supported by corresponding docu-mentation.

We fulfil all regulations according to DIN, EN, VdTÜV, AD-2000, TRD and also international regulations and standardsas ASME, ANSI and IBR. Our quality assurance system isapproved according to the following regulations: DIN EN ISO9001: 2000, Guide line 27/23 EG, KTA 1401 und ASME.

Our control valves have been tested and approved by all well-known acceptance authorities, such as TÜV, German Lloyd,Brit. Lloyd, Lloyd’s Register of Shipping and Norske Veritas.

Our Service Also, after delivery, an experienced team of service engineerswill be ready to provide assistance during the start-up period,or to carry out routine inspections.

An overhauling department integrated in the manufacturingdepartment is at your disposal. Not only do we test on fur-ther usability and overhaul professionally, we can also incor-porate any new design innovations into your system.

Should you wish to know more about this, please contactus. Our engineers and technicians are looking forward withpleasure to having a detailed discussion with you.

Steam converting valves of type E20 are used as low pres-sure bypass stations because of the kind of cooling waterinjection. The outlet of the valve is often near or directly infront of the condenser. The distance between the valve out-let and the condenser should be as short as possible. Usingmultiple pressure drop stages, consisting of both the perfo-rated cylinders in the valve and the dump tube itself, thesteam is safely admitted to the condenser at the properenergy level.

By the use of so called “dump tubes” the investment costsfor these flash trap distances are reduced:• reduction of the pipeline length and the diameter

between bypass valve and condenser.• optimized and adjusted dimensioning of bypass valve and

dump tube.• special design of each dump tube for the corresponding

application by the selection of an adjusted hole distribu-tion. By this, damages by droplet impact erosion at thecondenser pipes are avoided.

* droplet impact erosion happens if the water drops taken with the wetsteam are hitting the pipes directly with high local speed (v > 200 m/s).

Gütersloher Straße 257D-33649 BielefeldTel. +49 (0)521 9418-0 Fax. +49 (0)521 9418-170, -156 [email protected] W

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WELLAND & TUXHORNAG

A R M A T U R E N - U N D M A S C H I N E N F A B R I K

WELLAND & TUXHORNAG


WELLAND & TUXHORNAG


Dump TubesLow cost, optimized design

GuD power plant Puertollano, Spain© Siemens Press Picture

Safety First.Customized installation/operation instructions for highest reliability.

Flexibility in Motion.Actuator selection: electrical,hydraulic, and pneumatic.

A steam converting station is comprised of both the steamconverting valve, and the associated cooling water controlvalve. The coordinated feed forward temperature design ofthese two components is critical to proper operation of thesystem.Steam piping:No normal bends or three-dimensional bends, immediatelyin front of or behind the valve.• Guide values for straight lengths of pipe work are:

- Upstream line approx. 5 dia., minimum approx.2 - 5 m acc. to nominal size

- Downstream line approx. 10 dia., minimum approx.2 - 5 m acc. to nominal size

• The upstream line should have a slope against the direc-tion of flow of approximately 100: 1 to 200: 1. A properlysized drain should be installed at the lowest point.

• Take care to avoid the possible accumulation of condensa-tion as damage may occur to the pipe and valve fromwater hammer and erosion. Warming-up and heatinglines prevent the formation of condensation and reducecritical thermal stresses during start-up and shutdown.Remember that continuous operation produces little con-densation, whereas frequent starting and stopping pro-duces a great deal.

• Please follow the recommended start-up curves. Other-wise there is a risk of thermal stress. Longitudinal expan-sion should be brought about slowly.

• Arrangement of steam converting valve and cooling watercontrol valve close together; the desuperheating coolingwater control valve should be placed lower than the injec-tion point of the steam converting valve.

• Vertical spindle for easy maintenance, therefore shortenedassembly time. Desuperheating water supply throughsymmetrically rising pipes. They ensure a continuous andconstant supply of water to the injection point in the con-verting valve; in the case of operation shutdown, they pre-vent the cooling water pipes from draining. Drain line atthe lowest point in the system.

Cooling water lines:Cooling water lines have to be installed with enough flexi-bility to accommodate relative movement between thesteam line system and the water line system. The thermosensors have to be mounted into the straight downstreampipe, a min. of 5 - 8 m behind the valve, in horizontalexhaust steam pipes, in the 4 or 8 o’clock positions.

It is well-known that not all of these points can always berealized in practice. Shortage of available space frequentlymeans that compromises must be made.Therefore contact our engineers in time to develop thebest solution for your needs.

WELLAND & TUXHORNAG


High Availability.High Reliability.

• best cooling over the entire load range by sequen-tial opening of the pressure controlled nozzles

• optimized spray angle and minimized droplet sizebased upon the latest research results

• compact design

• all wear parts replaceable on site

• inherent low noise and vibration based upon lowercage design

• suitable for high temperature applications

• available in combination with customer specifieddump tube

Type DUV-E20

Steam entrance phase1 When the control piston leaves its seat, steam begins to

flow through the holes in the perforated cylinder.

Pressure reduction2 As the control piston strokes (0-100%) the holes in the perfo-

rated cylinder are released according to the correspondingcharacteristic curve. Pressure control is accomplished by thepositioning of the piston based upon load.

Exit phase3 The cooling water is injected through pressure controlled

nozzles proportional to the amount of steam requiringcooling. At lower cooling water requirements, only thecenter nozzles are opened.

4 As the required amount of cooling water increases, theother nozzles are opened. Using enthalpy based controllogic, the amount of cooling water required is calculatedand supplied by the corresponding cooling water controlvalve.

The axially arranged nozzles in the valve outlet guarantee a homogenous temperature distribution in the exhauststeam pipe.

Form Follows Function.Precise control for flawless operation.

1 2 3

Nominal sizeMaterial

Process connectionNominal pressureSeat-plug-sealingCharacteristicPressure reduction

Rangeability

Technical data

4

Material (standard version)

Available KVS and CV valuesTypeDN Inlet/OutletSeat-Ø mmPiston-Ø mmStroke mmSeat cross section cm2

Adjustable flow area cm2

Uncontrolled flow area cm2

Kvs

Cv

1

200/500

200

200

120

314,15

262

470

887

1037,6

2

225/600

225

225

130

397,61

332

600

1124

1314,8

3

250/700

250

250

150

490,87

410

740

1388

1623,7

4

250/700

270

270

160

572,55

495

890

1676

1960,3

5

300/900

300

300

180

706,85

590

1060

1997

2336,6

6

300/900

320

320

200

804,24

692

1245

2342

2740,5

7

350/1000

350

350

200

962,11

802

1445

2715

3176,1

8

400/1000

400

400

250

1256,60

1048

1885

3547

4150,4

9

450/1400

440

440

275

1520,00

1325

2385

4485

5247,4

10

500/1400

500

500

300

1963,50

1636

2945

5538

6479,0

Inlet OutletDN 200 to 800 / 8” to 32” DN 500 to 1600 / 20” to 64”

WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22WN 1.4903 / A 182 F91 · P92 / F92

Welding ends of all typesPN 16 to 250* Class 160 to 1500* PN 16 to 100 Class 150 to 900

Metallic · Leakage class IV and V20% equal percentage and 80% linear

1-stage control by control piston in the perforated cylinder. In addition, 2nd stage control with perforated cylinder at seat

30: 1

Nominal pressureBody

Seat and plugGuide bushingStuffing boxBody gasket


WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22 · WN 1.4903A 182 F91 ·P92 / F92

WN 1.4122, > 560 °C on demandWN 1.7380 nitrated or stellite

Pure graphiteCombination profile sealing with graphite or silver coat













WELLAND & TUXHORNAG





• compact design





Type DUV-E20










1 2 3



Rangeability

Technical data

4





Kvs

Cv

1

200/500

200

200

120

314,15

262

470

887

1037,6

2

225/600

225

225

130

397,61

332

600

1124

1314,8

3

250/700

250

250

150

490,87

410

740

1388

1623,7

4

250/700

270

270

160

572,55

495

890

1676

1960,3

5

300/900

300

300

180

706,85

590

1060

1997

2336,6

6

300/900

320

320

200

804,24

692

1245

2342

2740,5

7

350/1000

350

350

200

962,11

802

1445

2715

3176,1

8

400/1000

400

400

250

1256,60

1048

1885

3547

4150,4

9

450/1400

440

440

275

1520,00

1325

2385

4485

5247,4

10

500/1400

500

500

300

1963,50

1636

2945

5538

6479,0






30: 1



















WELLAND & TUXHORNAG





• compact design





Type DUV-E20










1 2 3



Rangeability

Technical data

4





Kvs

Cv

1

200/500

200

200

120

314,15

262

470

887

1037,6

2

225/600

225

225

130

397,61

332

600

1124

1314,8

3

250/700

250

250

150

490,87

410

740

1388

1623,7

4

250/700

270

270

160

572,55

495

890

1676

1960,3

5

300/900

300

300

180

706,85

590

1060

1997

2336,6

6

300/900

320

320

200

804,24

692

1245

2342

2740,5

7

350/1000

350

350

200

962,11

802

1445

2715

3176,1

8

400/1000

400

400

250

1256,60

1048

1885

3547

4150,4

9

450/1400

440

440

275

1520,00

1325

2385

4485

5247,4

10

500/1400

500

500

300

1963,50

1636

2945

5538

6479,0






30: 1








Type DUV-E20

















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WELLAND & TUXHORNAG


WELLAND & TUXHORNAG





Type DUV-E20

















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WELLAND & TUXHORNAG


WELLAND & TUXHORNAG




Documents

DUV-C3 6-Seiter engl. ok (Page 6) - Unitecnounitecno.es/wp-content/uploads/2015/05/by-pass-de-turbina.pdf · THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS ... 2000,TRD and also international