Type DUV-C3

S T E A M C O N V E R T I N G V A LV E S
for Power Stations and Industrial Plants
Type
DUV-C3
WELLAND & TUXHORN AG
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
DUV-C3
Type
Technical data
Nominal size
Inlet
Outlet
DN 80 to 500 / 3” to 20”
DN 100 to 1600 / 4” to 64”
WN 1.0460/A 105 · WN 1.5415 · WN 1.7335/A 182 F12
WN 1.7380/A 182 F22 · WN 1.4903/A 182 F912)
Materials
End connection
Welding ends in all versions
3-stages: < 0,25 · 4-stages: < 0,15
min. pressure ratio 1) p2/p1
Nominal pressure
PN 16 to 630 Class 150 to 2500 (4500)
PN 16 to 100 Class 150 to 900
Seat-plug-seal
Metal sealing · Leakage Class IV und V
Characteristic
20% equal percentage rest linear
Pressure reduction
Perforated cage trim provides controlled pressure reduction in two stages
additionally with throttle cylinders and throttle discs
1 : 50
Rangeability
1) For different pressure ratios, please contact Welland & Tuxhorn
2) On request
FORM FOLLOWS FUNCTION.
Pe r fe c t Co n t r o l a n d Re l i a b l e O p e r a t i o n .
1
2
3
PRESSURE REDUCTION
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 downstream 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.
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 simultaneously 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.
T E C H N I C A L I N F O R M AT I O N S
For further information please see our detailed data sheets. *
K VS and C V values available
K VS
23
30,5
52
85,5
112
161
CV
26,9
35,7
60,8
100
131
188
252
374
294,8 437,6
441
490
580
673
516
573,3
678
787
Seat-Ø
mm
45
55
65
80
90
110
135
160
180
200
230
260
Travel
mm
35
40
50
60
75
75
100
120
120
120
150
150
8
10,5
18
29,5
38,5
55,5
87
129
152
200
232
1,24
1,63
2,79
4,60
5,97
8,60
14
18
32,5
52
68
97
2,17
2,79
5,04
8,06
1 stage cm
st
Flow area
2
in2
2nd stage cm2
in2
169
13,48 19,99 23,55
152
225
268
26,2
298
30,99 35,95
350
405
10,54 15,03 23,55 34,86 41,52 46,19 54,23 62,75
WELLAND & TUXHORN AG
A R M A T U R E N -
* Technical alteration reserved.
U N D
M A S C H I N E N F A B R I K
Materials (Standard version)
Nominal pressure
Inlet
Outlet
PN 16 to 630 · Class 150 to 2500 (4500)
PN 16 to 100 · Class 150 to 900
WN 1.0460/A 105 · WN 1.5415 · WN 1.7335/A 182 F12
WN 1.7380/A 182 F22 · WN 1.4903/A 182 F91 2)
Body
Seat and plug
WN 1.4122
Guide bushing
WN 1.7380
Stuffing box
Pure graphite
Body gasket
Grooved gasket
2) On request
H I G H E S T A V A I L A B I L I T Y,
RANGEABILITY
4
AND OPERABILITY
• 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
WELLAND & TUXHORN AG
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
FLEXIBILITY IN MOTION.
Actuator selection: electric, hydraulic, pneumatic.
S A F E T Y F I R S T.
Customized installation / operation instructions for highest availability.
A steam converting station is
comprised of both the steam
converting valve, and the
associated cooling water control
valve. The coordinated feed
forward temperature design of
these two components is
critical to proper operation of
the system.
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 shutdown. 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 therefore 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 points
can always be realized in practice. Shortage
of available space frequently means that
compromises must be made.
Therefore contact our engineers in time to
develop the best solution for your needs.
M A D E I N G E R M A N Y.
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, workmanship 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 manufacturing 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 looking
forward with pleasure to having a detailed discussion
with you.
CCPP Paka, Malaysia
© Siemens Press Picture
Gütersloher Straße 257
D-33649 Bielefeld
Tel. +49 (0)521 9418-0
Fax +49 (0)521 9418-170, -156
www.welland-tuxhorn.de
WELLAND & TUXHORN AG
[email protected]
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
W&T-1 | DUV-C3/1 E | 4.04
THE AMERICAN SOCIETY
OF MECHANICAL ENGINEERS
Steam Converting Valves
for Power Stations and Industrial Plants
Dump Tubes
Made in Germany.
Low cost, optimized design
You will get a top product made by German valve specialists!
By the use of so called “dump tubes” the investment costs
for 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 distribution. By this, damages by droplet impact erosion at the
condenser pipes are avoided.
* droplet impact erosion happens if the water drops taken with the wet
steam are hitting the pipes directly with high local speed (v > 200 m/s).
Type
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, workmanship 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.
DUV-E20
Our control valves have been tested and approved by all wellknown 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 manufacturing
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 looking forward with
pleasure to having a detailed discussion with you.
We fulfil all regulations according to DIN, EN, VdTÜV, AD2000, TRD and also international 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.
GuD power plant Puertollano, Spain
© Siemens Press Picture
THE AMERICAN SOCIETY
OF MECHANICAL ENGINEERS
Gütersloher Straße 257
D-33649 Bielefeld
Tel. +49 (0)521 9418-0
Fax. +49 (0)521 9418-170, -156
WE LLAN D & TUXHOR N AG
www.welland-tuxhorn.de
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
[email protected]
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
U N D
M A S C H I N E N FA B R I K
W&T-1 | DUV-E20/1 D | 1.06
Steam converting valves of type E20 are used as low pressure bypass stations because of the kind of cooling water
injection. The outlet of the valve is often near or directly in
front of the condenser. The distance between the valve outlet and the condenser should be as short as possible. Using
multiple pressure drop stages, consisting of both the perforated cylinders in the valve and the dump tube itself, the
steam is safely admitted to the condenser at the proper
energy level.
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
U N D
M A S C H I N E N F A B R I K
Type DUV-E20
Form Follows Function.
High Availability.
Flexibility in Motion.
Precise control for flawless operation.
High Reliability.
Actuator selection: electrical,
hydraulic, and pneumatic.
1
2
• best cooling over the entire load range by sequential opening of the pressure controlled nozzles
4
3
• optimized spray angle and minimized droplet size
based upon the latest research results
Safety First.
• compact design
Customized installation/operation instructions for highest reliability.
• all wear parts replaceable on site
• inherent low noise and vibration based upon lower
cage design
• suitable for high temperature applications
Steam entrance phase
1 When the control piston leaves its seat, steam begins to
flow through the holes in the perforated cylinder.
Pressure reduction
2 As the control piston strokes (0-100%) the holes in the perforated cylinder are released according to the corresponding
characteristic curve. Pressure control is accomplished by the
positioning of the piston based upon load.
• available in combination with customer specified
dump tube
Exit phase
3 The cooling water is injected through pressure controlled
nozzles proportional to the amount of steam requiring
cooling. At lower cooling water requirements, only the
center nozzles are opened.
4 As the required amount of cooling water increases, the
other nozzles are opened. Using enthalpy based control
logic, the amount of cooling water required is calculated
and supplied by the corresponding cooling water control
valve.
Available KVS and CV values
Type
1
DN Inlet/Outlet
The axially arranged nozzles in the valve outlet guarantee
a homogenous temperature distribution in the exhaust
steam pipe.
Technical data
Inlet
Outlet
Nominal size
DN 200 to 800 / 8” to 32”
DN 500 to 1600 / 20” to 64”
Material
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22
WN 1.4903 / A 182 F91 · P92 / F92
Process connection
Nominal pressure
Seat-plug-sealing
Characteristic
Pressure reduction
Rangeability
Welding ends of all types
PN 16 to 250* Class 160 to 1500*
PN 16 to 100 Class 150 to 900
2
3
4
7
6
5
9
10
Seat-Ø
mm
200
225
250
270
300
320
350
400
440
500
Piston-Ø
mm
200
225
250
270
300
320
350
400
440
500
Stroke
mm
120
130
150
160
180
200
200
250
275
300
Seat cross section
cm2
314,15
397,61
490,87
572,55
706,85
804,24
962,11
Adjustable flow area
cm2
262
332
410
495
590
692
802
Uncontrolled flow area
cm2
1256,60 1520,00 1963,50
1048
1325
1636
470
600
740
890
1060
1245
1445
1885
2385
2945
Kvs
887
1124
1388
1676
1997
2342
2715
3547
4485
5538
Cv
1037,6
1314,8
1623,7
1960,3
2336,6
2740,5
3176,1
4150,4
5247,4
6479,0
Material (standard version)
Nominal pressure
Body
Metallic · Leakage class IV and V
Inlet
Outlet
DN 200 to 500 / 8” to 20”
DN 500 to 1600 / 20” to 63”
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22 · WN 1.4903
A 182 F91 ·P92 / F92
20% equal percentage and 80% linear
Seat and plug
WN 1.4122, > 560 °C on demand
1-stage control by control piston in the perforated cylinder. In addition, 2nd stage control
with perforated cylinder at seat
Guide bushing
WN 1.7380 nitrated or stellite
30: 1
8
200/500 225/600 250/700 250/700 300/900 300/900 350/1000 400/1000 450/1400 500/1400
Stuffing box
Pure graphite
Body gasket
Combination profile sealing with graphite or silver coat
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
A steam converting station is comprised of both the steam
converting valve, and the associated cooling water control
valve. The coordinated feed forward temperature design of
these two components is critical to proper operation of the
system.
Steam piping:
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, therefore 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.
Cooling water lines:
Cooling 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 points can always be
realized in practice. Shortage of available space frequently
means that compromises must be made.
Therefore contact our engineers in time to develop the
best solution for your needs.
Type DUV-E20
Form Follows Function.
High Availability.
Flexibility in Motion.
Precise control for flawless operation.
High Reliability.
Actuator selection: electrical,
hydraulic, and pneumatic.
1
2
• best cooling over the entire load range by sequential opening of the pressure controlled nozzles
4
3
• optimized spray angle and minimized droplet size
based upon the latest research results
Safety First.
• compact design
Customized installation/operation instructions for highest reliability.
• all wear parts replaceable on site
• inherent low noise and vibration based upon lower
cage design
• suitable for high temperature applications
Steam entrance phase
1 When the control piston leaves its seat, steam begins to
flow through the holes in the perforated cylinder.
Pressure reduction
2 As the control piston strokes (0-100%) the holes in the perforated cylinder are released according to the corresponding
characteristic curve. Pressure control is accomplished by the
positioning of the piston based upon load.
• available in combination with customer specified
dump tube
Exit phase
3 The cooling water is injected through pressure controlled
nozzles proportional to the amount of steam requiring
cooling. At lower cooling water requirements, only the
center nozzles are opened.
4 As the required amount of cooling water increases, the
other nozzles are opened. Using enthalpy based control
logic, the amount of cooling water required is calculated
and supplied by the corresponding cooling water control
valve.
Available KVS and CV values
Type
1
DN Inlet/Outlet
The axially arranged nozzles in the valve outlet guarantee
a homogenous temperature distribution in the exhaust
steam pipe.
Technical data
Inlet
Outlet
Nominal size
DN 200 to 800 / 8” to 32”
DN 500 to 1600 / 20” to 64”
Material
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22
WN 1.4903 / A 182 F91 · P92 / F92
Process connection
Nominal pressure
Seat-plug-sealing
Characteristic
Pressure reduction
Rangeability
Welding ends of all types
PN 16 to 250* Class 160 to 1500*
PN 16 to 100 Class 150 to 900
2
3
4
7
6
5
9
10
Seat-Ø
mm
200
225
250
270
300
320
350
400
440
500
Piston-Ø
mm
200
225
250
270
300
320
350
400
440
500
Stroke
mm
120
130
150
160
180
200
200
250
275
300
Seat cross section
cm2
314,15
397,61
490,87
572,55
706,85
804,24
962,11
Adjustable flow area
cm2
262
332
410
495
590
692
802
Uncontrolled flow area
cm2
1256,60 1520,00 1963,50
1048
1325
1636
470
600
740
890
1060
1245
1445
1885
2385
2945
Kvs
887
1124
1388
1676
1997
2342
2715
3547
4485
5538
Cv
1037,6
1314,8
1623,7
1960,3
2336,6
2740,5
3176,1
4150,4
5247,4
6479,0
Material (standard version)
Nominal pressure
Body
Metallic · Leakage class IV and V
Inlet
Outlet
DN 200 to 500 / 8” to 20”
DN 500 to 1600 / 20” to 63”
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22 · WN 1.4903
A 182 F91 ·P92 / F92
20% equal percentage and 80% linear
Seat and plug
WN 1.4122, > 560 °C on demand
1-stage control by control piston in the perforated cylinder. In addition, 2nd stage control
with perforated cylinder at seat
Guide bushing
WN 1.7380 nitrated or stellite
30: 1
8
200/500 225/600 250/700 250/700 300/900 300/900 350/1000 400/1000 450/1400 500/1400
Stuffing box
Pure graphite
Body gasket
Combination profile sealing with graphite or silver coat
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
A steam converting station is comprised of both the steam
converting valve, and the associated cooling water control
valve. The coordinated feed forward temperature design of
these two components is critical to proper operation of the
system.
Steam piping:
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, therefore 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.
Cooling water lines:
Cooling 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 points can always be
realized in practice. Shortage of available space frequently
means that compromises must be made.
Therefore contact our engineers in time to develop the
best solution for your needs.
Type DUV-E20
Form Follows Function.
High Availability.
Flexibility in Motion.
Precise control for flawless operation.
High Reliability.
Actuator selection: electrical,
hydraulic, and pneumatic.
1
2
• best cooling over the entire load range by sequential opening of the pressure controlled nozzles
4
3
• optimized spray angle and minimized droplet size
based upon the latest research results
Safety First.
• compact design
Customized installation/operation instructions for highest reliability.
• all wear parts replaceable on site
• inherent low noise and vibration based upon lower
cage design
• suitable for high temperature applications
Steam entrance phase
1 When the control piston leaves its seat, steam begins to
flow through the holes in the perforated cylinder.
Pressure reduction
2 As the control piston strokes (0-100%) the holes in the perforated cylinder are released according to the corresponding
characteristic curve. Pressure control is accomplished by the
positioning of the piston based upon load.
• available in combination with customer specified
dump tube
Exit phase
3 The cooling water is injected through pressure controlled
nozzles proportional to the amount of steam requiring
cooling. At lower cooling water requirements, only the
center nozzles are opened.
4 As the required amount of cooling water increases, the
other nozzles are opened. Using enthalpy based control
logic, the amount of cooling water required is calculated
and supplied by the corresponding cooling water control
valve.
Available KVS and CV values
Type
1
DN Inlet/Outlet
The axially arranged nozzles in the valve outlet guarantee
a homogenous temperature distribution in the exhaust
steam pipe.
Technical data
Inlet
Outlet
Nominal size
DN 200 to 800 / 8” to 32”
DN 500 to 1600 / 20” to 64”
Material
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22
WN 1.4903 / A 182 F91 · P92 / F92
Process connection
Nominal pressure
Seat-plug-sealing
Characteristic
Pressure reduction
Rangeability
Welding ends of all types
PN 16 to 250* Class 160 to 1500*
PN 16 to 100 Class 150 to 900
2
3
4
7
6
5
9
10
Seat-Ø
mm
200
225
250
270
300
320
350
400
440
500
Piston-Ø
mm
200
225
250
270
300
320
350
400
440
500
Stroke
mm
120
130
150
160
180
200
200
250
275
300
Seat cross section
cm2
314,15
397,61
490,87
572,55
706,85
804,24
962,11
Adjustable flow area
cm2
262
332
410
495
590
692
802
Uncontrolled flow area
cm2
1256,60 1520,00 1963,50
1048
1325
1636
470
600
740
890
1060
1245
1445
1885
2385
2945
Kvs
887
1124
1388
1676
1997
2342
2715
3547
4485
5538
Cv
1037,6
1314,8
1623,7
1960,3
2336,6
2740,5
3176,1
4150,4
5247,4
6479,0
Material (standard version)
Nominal pressure
Body
Metallic · Leakage class IV and V
Inlet
Outlet
DN 200 to 500 / 8” to 20”
DN 500 to 1600 / 20” to 63”
WN 1.0460 / A 105 · WN 1.5415 · WN 1.7335 / A 182 F12 · WN 1.7380 / A 182 F22 · WN 1.4903
A 182 F91 ·P92 / F92
20% equal percentage and 80% linear
Seat and plug
WN 1.4122, > 560 °C on demand
1-stage control by control piston in the perforated cylinder. In addition, 2nd stage control
with perforated cylinder at seat
Guide bushing
WN 1.7380 nitrated or stellite
30: 1
8
200/500 225/600 250/700 250/700 300/900 300/900 350/1000 400/1000 450/1400 500/1400
Stuffing box
Pure graphite
Body gasket
Combination profile sealing with graphite or silver coat
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
A steam converting station is comprised of both the steam
converting valve, and the associated cooling water control
valve. The coordinated feed forward temperature design of
these two components is critical to proper operation of the
system.
Steam piping:
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, therefore 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.
Cooling water lines:
Cooling 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 points can always be
realized in practice. Shortage of available space frequently
means that compromises must be made.
Therefore contact our engineers in time to develop the
best solution for your needs.
Steam Converting Valves
for Power Stations and Industrial Plants
Dump Tubes
Made in Germany.
Low cost, optimized design
You will get a top product made by German valve specialists!
By the use of so called “dump tubes” the investment costs
for 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 distribution. By this, damages by droplet impact erosion at the
condenser pipes are avoided.
* droplet impact erosion happens if the water drops taken with the wet
steam are hitting the pipes directly with high local speed (v > 200 m/s).
Type
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, workmanship 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.
DUV-E20
Our control valves have been tested and approved by all wellknown 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 manufacturing
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 looking forward with
pleasure to having a detailed discussion with you.
We fulfil all regulations according to DIN, EN, VdTÜV, AD2000, TRD and also international 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.
GuD power plant Puertollano, Spain
© Siemens Press Picture
THE AMERICAN SOCIETY
OF MECHANICAL ENGINEERS
Gütersloher Straße 257
D-33649 Bielefeld
Tel. +49 (0)521 9418-0
Fax. +49 (0)521 9418-170, -156
WE LLAN D & TUXHOR N AG
www.welland-tuxhorn.de
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
[email protected]
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
U N D
M A S C H I N E N FA B R I K
W&T-1 | DUV-E20/1 D | 1.06
Steam converting valves of type E20 are used as low pressure bypass stations because of the kind of cooling water
injection. The outlet of the valve is often near or directly in
front of the condenser. The distance between the valve outlet and the condenser should be as short as possible. Using
multiple pressure drop stages, consisting of both the perforated cylinders in the valve and the dump tube itself, the
steam is safely admitted to the condenser at the proper
energy level.
WE LLAN D & TUXHOR N AG
A R M AT 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
Dump Tubes
Made in Germany.
Low cost, optimized design
You will get a top product made by German valve specialists!
By the use of so called “dump tubes” the investment costs
for 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 distribution. By this, damages by droplet impact erosion at the
condenser pipes are avoided.
* droplet impact erosion happens if the water drops taken with the wet
steam are hitting the pipes directly with high local speed (v > 200 m/s).
Type
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, workmanship 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.
DUV-E20
Our control valves have been tested and approved by all wellknown 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 manufacturing
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 looking forward with
pleasure to having a detailed discussion with you.
We fulfil all regulations according to DIN, EN, VdTÜV, AD2000, TRD and also international 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.
GuD power plant Puertollano, Spain
© Siemens Press Picture
THE AMERICAN SOCIETY
OF MECHANICAL ENGINEERS
Gütersloher Straße 257
D-33649 Bielefeld
Tel. +49 (0)521 9418-0
Fax. +49 (0)521 9418-170, -156
WE LLAN D & TUXHOR N AG
www.welland-tuxhorn.de
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
[email protected]
A R M AT U R E N -
U N D
M A S C H I N E N FA B R I K
U N D
M A S C H I N E N FA B R I K
W&T-1 | DUV-E20/1 D | 1.06
Steam converting valves of type E20 are used as low pressure bypass stations because of the kind of cooling water
injection. The outlet of the valve is often near or directly in
front of the condenser. The distance between the valve outlet and the condenser should be as short as possible. Using
multiple pressure drop stages, consisting of both the perforated cylinders in the valve and the dump tube itself, the
steam is safely admitted to the condenser at the proper
energy level.
WE LLAN D & TUXHOR N AG
A R M AT U R E N -
U N D
M A S C H I N E N F A B R I K