electro-hydraulic i/h converters and wsr way valves
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Well-established technology
Electro-hydraulic I/H converters
and WSR way valves are the ideal
eco nomic solution for controlling
hy draulic positioning cylinders.
This enables a valve to regulate the
mass flow (e.g. steam) in a precise
and highly dynamic manner.
A current input signal (0/4 – 20 mA)
in the I/H converters or WSR way
valves is proportionally converted
into an output pressure or an oil
flow.
Outstanding reliability
The electro-hydraulic I/H converters
and WSR way valves design is a
simple one:nControl magnet with integrated
electronicsnHydraulic component
This simple and compact design
serves to ensure high operational
reliability coupled with availability of
the components, and your system.
All the world‘s our home
We are a reliable partner to manu-
facturers and operators of turbo ma-
chines in all international markets.
Voith Turbo actuator technology
has established itself 10,000 times
over in power plants across the
globe and ensures economic oper-
ation of turbines and compressors.
Electro-hydraulic I/H Converters and WSR Way Valves Actuator Technology for Positioning Cylinders on Turbomachinery
4 1 5 3 2 6 7
T A P
2
Design
A Voith I/H converter is an electric-
ally-controllable pressure regulating
valve, consisting of force-controlled
solenoid and a hydraulic component.
I/H converters
Voith Turbo I/H converters convert a 0/4 – 20 mA current
input signal quickly and precisely into proportional output
pressure.
A Consumer terminal (output)T Tank connectionP Oil supply terminal (input)1 Control magnet housing2 Tappet3 Potentiometer4 Manual adjustment5 Electrical connection6 Hydraulic component7 Control piston
+24V
T P T P
X1X0A
T P
Pilot valve
A
Proc
ess
cont
rol e
ngin
eerin
g
Control magnet Hydraulic pilot control
A
For process control engineering
FMag
is
FHydr
Position pick up sensor ss
s
Live steam
Electronic position return
Live steam
Live steam
Steam valve
3
w
Pilot valve
Mechanical position return
UF
The control magnet applies the
force FMag to the control piston. This
in turn counteracts hydraulic force
FHydr as generated by the pressure
at output A over the cross-sectional
area of the control piston (pressure
regulator).
Function
Solenoid-force control generates a
magnetic force of FMag in a 24V d.c.
solenoid. This magnetic force is pro-
portional to the 0/4 – 20 mA input
signal (w), the limits are configured
using the X0 and X1 parameters.
The electronic control, magnetic
flux measurement, engineering de-
sign of the magnet and the hydraul-
ic pilot control together form a dy-
namic functional unit that is prac-
tically free of hysteresis.
Application principle 1:Direct actuation of a hydraulic cylinder
Application principle 3:Operation of a pilot valve with electronic position return
Application principle 2:Operation of a pilot valve with mechanical position return
Simple design and well-established operating principle
A Consumer terminal (output)T Tank connectionP Oil supply terminal (input)X0, X1 Parameters for output
pressure range (potentiometer)
FMag Magnetic forceFHydr Hydraulic forceUHall Hall voltageU Voltages Strokei Position pick up sensor
current signalw Nominal value for output
pressure
UHALL
As a result of this regulation, the
output line of the actuator always
receives the exact required pres-
sure and the oil quantity for pos-
itioning the steam or fuel valves.
+
-
4
Versatile application made possible by robust design and maximum precision
Technical data
and characteristics
nSupply voltage 24 VDCnCurrent consumption 1.0 An Input signal 0/4 – 20 mAnType of protection IP 65n Input pressure up to 70 barnAmbient temperature - 20 to
+ 80 °C for standard designnExplosion-proof design
EEx d IIC T4 available
Voith Turbo I/H converters to a 300 MW steam turbineSelection table
System-specific data must be taken
into consideration when defining a
suitable I/H converter. When select-
ing an I/H converter, please make
full use of our comprehensive know-
ledge. Our experienced sales staff
will be only too glad to be of assist-
ance.
Type Maximum input pressure
[bar]
Control range for output pressure
[bar]
Flow rate [l/min] at p = 1 bar
P ➞ A A ➞ T
DSG-B03XXX 40 0 – 3 30 30
DSG-B05XXX 40 0 – 5 30 30
DSG-B05X48 20 0 – 5 100 140
DSG-B07XXX 40 1 – 7 30 30
DSG-B10XXX 40 0 – 10 30 30
DSG-B30XXX 70 0 – 30 30 30
DSG-B35XXX 70 10 – 35 30 30
5
Simple installation and initial
startup
nDevice inspected and configured
at factory (plug & play)nmin. and max. Output pressures can
be changed simply using parameters
X0 and X1 (potentiometers)nTurbine lubricating oil can frequently
be used as an operating mediumnDepending on the model in ques-
tion, adapter plates, flushing
plates and connecting cables are
available
Outstanding reliability and
availability
nWell-established operating
principlenDirt-resistant and robust design
Customer benefits
Voith Turbo I/H converters to a 3.4 MW steam turbine(Photo: AG KK&K – www.agkkk.de)
Explosion-proof design (left) and standard designVoith Turbo I/H converters to a 300 MW steam turbine
Dynamic and precise positioning
of the output pressure
nReproducibility < 0.1 %nAlmost no hysteresisnTemperature compensationnNo driftingn Input pressure at least 0.5 bar
higher than maximum output
pressurenFast response time
6
4 13 3 2 6 7 853/3 -WSR way valve
A Consumer terminal (output)T Tank connectionP Oil supply terminal (input)1 Control magnet housing2 Tappet3 Potentiometer4 Manual adjustment5 Electrical connection6 Hydraulic component7 Control piston8 Control spring
WSR way valves
Design
A Voith Turbo WSR way valve (fuel-
quantity positioner) is an electric-
ally-controllable directional control
valve, consisting of force-controlled
solenoids and a 3/3-WSR way valve
hydraulic unit for single-acting cylin-
ders or 4/3-WSR way valve hydraul-
ic unit for dual-acting cylinders.
Voith Turbo WSR way valves with integrated positioner convert in
combination with an hydraulic cylinder a 4 – 20 mA current input
signal quickly and pre cisely into a propor tional stroke.
3/3-WSR way valves or 4/3-WSR way valves can be used to position
hydraulic cylinders in a highly dynamic manner.
T A P
7
until the travel-specific spring force
FF balances out against the force
FMag. This results in a volumetric
flow that can be changed in both
direction and size, and which can
adjust the stroke s of an externally
mounted hydraulic cylinder. The
actual position is monitored by
means of a position pick up sensor
and sent to the positioner inte-
grated into the WSR way valve. The
adjustment of hydraulic cylinder
occurs position controlled.
Function
The specific system deviation (nom-
inal value w - actual value x) and the
set control gain KPU resp. KPD,
yields a reference variable UMag for
the solenoid force control. The mag-
netic force FMag generated in the
magnet system is monitored indir-
ectly through measurement of the
magnetic flux over UHall and sent
back to the controller. FMag acts via
the tappet on the control piston of
the hydraulic pilot control. This is
deflected against the control spring
Integrated control electronics for dynamic and high-precision changes in flow rate
4/3-WSR way valve for dual-acting hydraulic cylinders3/3-WSR way valve for single-acting hydraulic cylinders
X1
X0
Position pick up sensor
sSteam control valve
Live steam
A+24V
T P
FMag FF
x
Proc
ess
cont
rol e
ngin
eerin
g
Proc
ess
cont
rol e
ngin
eerin
g
sSteam control valve
Live steam
Hydraulic cylinder
w
A+24V
T
FMag
x
w
P T
B
Control magnetHydraulic pilot
controlControl magnet
A, B Consumer terminals (outputs)T Tank connectionP Oil supply terminal (input)X0, X1 Parameters for stroke
adjustment (potentiometers)KPU, KPD Control gains (potentiometers)w Position nominal value
(4 – 20 mA)x Position actual value
(4 – 20 mA)FMag Magnetic forceFF Force for control springUHall Hall voltageUMag Reference variable for solenoid
force FMag
U Voltages Strokei Position pick up sensor
current signal
is
is
UF
UF
UHall
UMag FF
Hydraulic pilot control
KPU
KPD
KPU
KPD
UMag
Hydraulic cylinder
Position pick up sensor
UHall
+
-
+
-
X1
X0+
-
+
-
8
Large flow rates and maximum accuracy enable versatile applicationTechnical data
and characteristics
n Supply voltage 24 VDCn Current consumption 1.0 An Input signal 4 – 20 mAn Remote display 4 – 20 mAn Type of protection IP 65n Input pressure up to 160 barnAmbient temperature - 20 to
+ 80 °C for standard designnExplosion-proof design
EEx d IIC T4 available
Selection table for 4/3-WSR way valveSelection table for 3/3-WSR way valve
System-specific data must be taken
into consideration when defining a
suitable WSR way valve. When se-
lecting a WSR way valve, please
make full use of our comprehensive
knowledge. Our experienced sales
staff will be only too glad to be of
assistance.
Type Maximum input pressure
[bar]
Flow rate [l/min] at p = 1 bar
P ➞ A A ➞ T
WSR-C25XXX 200 17 62
WSR-C45XXX up to 40 22 75
WSR-C60XXX up to 40 35 150
WSR-E60XXX up to 40 30 350
WSR-E80XXX up to 40 50 600
WSR-K120XXX 25 600 600
Type Maximum input pressure
[bar]
Flow rate [l/min] at p = 2 bar
P ➞ A/B A/B ➞ T
WSR-D16XXX up to 160 14 14
WSR-D24XXX 40 40 40
WSR-D45XXX up to 40 80 80
WSR-D60XXX 40 130 130
WSR-D80XXX 40 180 180
WSR-K120XXX 25 600 600
9
Dynamic and high-precision
control
nResolution < 10 µmnAlmost no hysteresisnTemperature compensationnLoad shedding < 300 ms can be
realized
Outstanding reliability and
availability
nWell-established operating
principlenDirt-resistant and robust design
Customer benefits
Voith Turbo WSR way valves to a 40 MW steam turbine (photo: MAN Turbo)
Standard version, explosion-proof version optional
Simple installation and initial
startup
nDevice inspected and configured
at factory (plug & play)nThe stroke range and control re-
sponse of the working cylinder can
be easily changed and optimized
using the potentiometers (X0, X1,
KPU, KPD)nTurbine lubricating oil can frequent-
ly be used as an operating medium
For process control engineering
is
UF
pA1
pA2
A
T P
is
is
UF
10
Proc
ess
cont
rol e
ngin
eerin
g
Redundant actuator technology – maximum availability I/H converter module = 2 x I/H converter + maximum selection
w1
X1X0
2 x Control magnet Hydraulic pilot control
w2
x1
x2
x3
X1X0
Function
Dual-channel conversion of electrical
actuating signals into a hydraulic
pressure with maximum selection:
The two electrical actuator signals
w1 and w2 (4 – 20 mA) of a redundant
turbine controller are each converted
separately by a well-established
Voith I/H converter into a propor-
tional hydraulic pressure pA1 and pA2.
Both pressures act on a hydraulic
maximum selection. The higher pres-
sure is switched through (A). The hy-
draulic function can be continuously
monitored with the aid of additional-
ly-integrated pressure sensors under
normal operating conditions through
ramp-shaped lowering of the turbine
controller‘s nominal value. This pres-
sure variation enables diagnosis of
each sub-system to be conducted
during operation.
Each I/H converter receives an elec-
tronic monitoring circuit which
serves to ensure that in the event of
any malfunction the I/H converter
then regulates towards minimum
output pressure. The output pres-
sure of the correctly operating I/H
converter is switched through. The
process then continues smoothly.
The faulty device can be replaced
during operation.
x1
x2
x3
Steam control valve
Live steam
s
Position pick up sensor
Hydraulic cylinder
FHydrFMag
FMag
+24V
+24VFHydr
UHall
UHall
+
+
-
-
Maximum selection
UF
UF
is
is
11
Tandem WSR way valve = 2 x control magnet + hydraulic component
Proc
ess
cont
rol e
ngin
eerin
g
FF
A+24V
T
FMag
w2 P
Control magnet 1 Hydraulic pilot control
FMagw1
+24Vx1out
x2out
Function
Both control magnets are given a
separate nominal value (w1 and w2)
and a separate position pick up
sensor (x1in and x2in) is connected to
each control magnet. The control
magnet 1 armature moves the con-
trol piston of the hydraulic pilot
control via the control magnet 2
armature. If control magnet 1 is
active then control magnet 2 is
inactive, although switched on.
In the event of a malfunction, the
control magnet 1 is switched off
and control magnet 2 is activated
over the nominal value (w2) using a
specific transit time („warm redun-
dancy“). The switching logic is lo-
cated externally in the control engin-
eering and it monitors the control
magnets (position pick up sensor
displays x1out and x2out). It also gener-
ates the switchover signals.
Tandem WSR way valves are also
available as 3/3 and 4/3 versions.
UHall
s
A Consumer terminal (output)T Tank connectionP Oil supply terminal (input)pA1, pA2 Output pressure for I/H converterX0, X1 Parameters for stroke or pressure
adjustment (potentiometers)KPU, KPD Control gains (potentiometers)w Stroke or pressure nominal value
(4 – 20 mA)x Position actual value (4 – 20 mA)FMag Magnetic forceFHydr Hydraulic forceFF Force for control springUHall Hall voltageU Voltages Strokei Position pick up sensor current
signal
X1X0
X1
X0
x1in
x2in
Steam control valve
Live steam
Position pick up sensor
Hydraulic cylinder
UHallKPDKPUKPDKPU
+
-
+
-
+
-
+
-
Control magnet 2
cr30
4en,
S&
F /W
A, 0
6.20
10, 1
500.
Dim
ensi
ons
and
illu
stra
tions
with
out
ob
ligat
ion.
Sub
ject
to
mo
difi
catio
ns.
Voith Turbo GmbH & Co. KG
Electronic Drive Systems
Voithstr. 1
74564 Crailsheim, Germany
Tel. +49 7951 32-470
Fax +49 7951 32-605
turcon@voith.com
www.voithturbo.com/actuation-control-turbomachinery
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