Electro-hydraulic I/h Converter And Wsr Way Valve, 3v1a32

Electro-hydraulic I/H converter and WSR way valve, actuator technology for positioning cylinders on turbo machinery

Well-established technology

Outstanding reliability

All the world‘s our home

Electro-hydraulic I/H converter and WSR way valves are the ideal economic solution for controlling hydraulic positioning cylinders. This enables a valve to regulate the mass flow (e.g. steam) in a precise and highly dynamic manner.

The electro-hydraulic I/H converter and WSR way valve design is a simple one:

We are a reliable partner to manufacturers and operators of turbo machines in all international markets.

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.

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Control magnet with integrated electronics Hydraulic component

This simple and compact design serves to ensure high operational reliability coupled with availability of the components, and your system.

Voith Turbo actuator technology has established itself 10,000 times over in power plants across the globe and ensures economic operation of turbines and compressors.

I/H converters

Voith Turbo I/H converters convert a 0/4 – 20 mA current input signal quickly and precisely into proportional output pressure.

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1

5

3

2

6

7 A T P 1 2 3 4 5 6 7

T

Design

A Voith I/H converter is an electrically-controllable pressure regulating valve, consisting of force-controlled solenoid and a hydraulic component.

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A

P

Consumer terminal (output) Tank connection Oil supply terminal (input) Control magnet housing Tappet Potentiometer Manual adjustment Electrical connection Hydraulic component Control piston

Simple design and well-established operating principle Application principle 1: Direct actuation of a hydraulic cylinder

Application principle 2: Operation of a pilot valve with mechanical position return

Application principle 3: Operation of a pilot valve with electronic position return

Mechanical position return s

i s For process control engineering

s A Steam valve

Pilot valve

Live steam

Process control engineering

X0 X1

w

U UHALL

F

Live steam

P

Pilot valve

A T P X0, X1

A

+24V

+

T

FMag

FHydr

T

P

FMag FHydr UHall U s i w

Control magnet

Hydraulic pilot control

Electronic position return s

Position pick up sensor

A

T

P

Live steam

Consumer terminal (output) Tank connection Oil supply terminal (input) Parameters for output pressure range (potentiometer) Magnetic force Hydraulic force Hall voltage Voltage Stroke Position pick up sensor current signal Nominal value for output pressure

Function

Solenoid-force control generates a magnetic force of FMag in a 24V d.c. solenoid. This magnetic force is proportional 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 design of the magnet and the hydraulic pilot control together form a dynamic functional unit that is practically free of hysteresis.

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).

As a result of this regulation, the output line of the actuator always receives the exact required pressure and the oil quantity for positioning the steam or fuel valves.

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Versatile application made possible by robust design and maximum precision Technical data and characteristics ■ ■ ■ ■ ■ ■

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Supply voltage 24 VDC Current consumption 1.0 A Input signal 0/4 – 20 mA Type of protection IP 65 Input pressure up to 70 bar Ambient temperature - 20 to + 80 °C for standard design Explosion-proof design EEx d IIC T4 available

Type

Maximum input pressure [bar]

Control range for output pressure* [bar]

DSG-B03XXX

40

0–3

DSG-B05XXX

40

0–5

DSG-B07XXX

40

1–7

DSG-B10XXX

40

0 – 10

DSG-B30XXX

70

2 – 30

* Flow rate at p = 1 bar: ~30 l / min to consumer (P ➞ A) and to tank (A ➞ T) Selection table

System-specific data must be taken into consideration when defining a suitable I/H converter. When selecting an I/H converter, please make full use of our comprehensive knowledge. Our experienced sales staff will be only too glad to be of assistance.

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Voith Turbo I/H converters to a 300 MW steam turbine

Customer benefits

Outstanding reliability and

Dynamic and precise positioning

Simple installation and initial

availability

of the output pressure

startup

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Well-established operating principle Dirt-resistant and robust design

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Voith Turbo I/H converters to a 3.4 MW steam turbine (Photo: AG KK&K – www.agkkk.de)

Reproducibility < 0.1 % Almost no hysteresis Temperature compensation No drifting Input pressure at least 0.5 bar higher than maximum output pressure Fast response time

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Device inspected and configured at factory (plug & play) min. and max. Output pressures can be changed simply using parameters X0 and X1 (potentiometers) Turbine lubricating oil can frequently be used as an operating medium Depending on the model in question, adapter plates, flushing plates and connecting cables are available

Explosion-proof design (left) and standard design

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WSR way valve Voith Turbo WSR way valves with integrated positioner convert a 4 – 20 mA current input signal quickly and precisely into a proportional stroke. 3/3-WSR way valves or 4/3-WSR way valves can be used to position hydraulic cylinders in a highly dynamic manner.

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3

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3/3 -WSR way valve A T P 1 2 3 4 5 6 7 8

T

Design

A Voith Turbo WSR way valve (fuelquantity positioner) is an electrically-controllable directional control valve, consisting of force-controlled solenoids and a 3/3-WSR way valve hydraulic unit for single-acting cylinders or 4/3-WSR way valve hydraulic unit for dual-acting cylinders.

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A

P

Consumer terminal (output) Tank connection Oil supply terminal (input) Control magnet housing Tappet Potentiometer Manual adjustment Electrical connection Hydraulic component Control piston Control spring

Integrated control electronics for dynamic and high-precision changes in flow rate 3/3-WSR way valve for single-acting hydraulic cylinders

Position pick up sensor

Hydraulic cylinder

Position pick up sensor

s

i

4/3-WSR way valve for dual-acting hydraulic cylinders

Steam control valve

s

Hydraulic cylinder

s

i

Steam control valve

s

Live steam

Live steam

-

+ X0

X1

+24V

x w

-

UMag

+

KPU KPD

U

A FMag

FF

F

UHall T Control magnet

P

Hydraulic pilot control

Process control engineering

Process control engineering

+ X0 X1

+24V

x w

UMag

+

KPU KPD

B

FMag

FF

F

UHall T Control magnet

Function

The specific system deviation (nominal value w - actual value x) and the set control gain KPU resp. KPD, yields a reference variable UMag for the solenoid force control. The magnetic force FMag generated in the magnet system is monitored indirectly 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

U

A

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 integrated into the WSR way valve. The adjustment of hydraulic cylinder occurs position controlled.

P

T

Hydraulic pilot control

A, B T P X0, X1

Consumer terminals (outputs) Tank connection Oil supply terminal (input) 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 force FF Force for control spring UHall Hall voltage UMag Reference variable for solenoid force FMag U Voltage s Stroke i Position pick up sensor current signal

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Large flow rates and maximum accuracy enable versatile application Technical data and characteristics ■ ■ ■ ■ ■ ■ ■

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Supply voltage 24 VDC Current consumption 1.0 A Input signal 4 – 20 mA Remote display 4 – 20 mA Type of protection IP 65 Input pressure up to 160 bar Ambient temperature - 20 to + 80 °C for standard design Explosion-proof design EEx d IIC T4 available

Type

Maximum input pressure [bar]

Flow rate [l/min] at p = 1 bar to …

Type

Consumer

Tank

Flow rate [l/min] at p = 2 bar

WSR-D16XXX

up to 160

12

WSR-C45XXX

up to 40

22

75

WSR-D24XXX

40

28

WSR-C60XXX

up to 40

35

150

WSR-D45XXX

up to 40

75

WSR-E60XXX

25

30

350

WSR-D60XXX

40

130

WSR-K120XXX

20

600

600

WSR-L120XXX

20

600

Selection table for 3/3-WSR way valve

System-specific data must be taken into consideration when defining a suitable WSR way valve. When selecting 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.

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Maximum input pressure [bar]

Selection table for 4/3-WSR way valve

Customer benefits Outstanding reliability and

Dynamic and high-precision

Simple installation and initial

availability

control

startup

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Well-established operating principle Dirt-resistant and robust design

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Resolution < 10 µm Almost no hysteresis Temperature compensation Load shedding < 300 ms can be realized

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Voith Turbo WSR way valves to a 40 MW steam turbine (photo: MAN Turbo)

Device inspected and configured at factory (plug & play) The stroke range and control response of the working cylinder can be easily changed and optimized using the potentiometers (X0, X1, KPU, KPD) Turbine lubricating oil can frequently be used as an operating medium

Standard version, explosion-proof version optional

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Redundant actuator technology – maximum availability I/H converter module = 2 x I/H converter + maximum selection Position pick up sensor x1

i

x2

i

x3

i

Hydraulic cylinder

s

s

s

For process control engineering

x1 x2 x3

Live steam

A X0

+24V

X1 +

w1 Process control engineering

Steam control valve

s

U UHall

X0

X1

w2

FMag

U UHall

FHydr

F

+24V +

pA1

FMag

Maximum selection

FHydr

F pA2 T

2 x Control magnet

P

Hydraulic pilot control

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 proportional hydraulic pressure pA1 and pA2. Both pressures act on a hydraulic maximum selection. The higher pressure is switched through (A). The hydraulic function can be continuously 10

monitored with the aid of additionally-integrated pressure sensors under normal operating conditions through ramp-shaped lowering of the turbine controller‘s nominal value. This pressure variation enables diagnosis of each sub-system to be conducted during operation. Each I/H converter receives an electronic 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 pressure of the correctly operating I/H converter is switched through. The process then continues smoothly. The faulty device can be replaced during operation.

Tandem WSR way valve = 2 x control magnet + hydraulic component Position pick up sensor x1in

i x2in i

Hydraulic cylinder

s

s

Steam control valve

s

Live steam

-

Process control engineering

+ X0

X1

X1

x1out w1

-

+ X0

x2out

+24V

-

U

+ KPU KPD

UHall

+24V

FMag F

U

+ KPU KPD

A

FMag

FF

F

UHall

w2

T

Control magnet 1

Control magnet 2

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 control 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 redundancy“). The switching logic is located externally in the control engineering and it monitors the control magnets (position pick up sensor displays x1out and x2out). It also generates the switchover signals. Tandem WSR way valves are also available as 3/3 and 4/3 versions.

P

Hydraulic pilot control

A T P pA1, pA2 X0, X1

Consumer terminal (output) Tank connection Oil supply terminal (input) Output pressure for I/H converter 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 force FHydr Hydraulic force FF Force for control spring UHall Hall voltage U Voltage s Stroke i Position pick up sensor current signal

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Cr 304 en, 02.2007, 1500, aik / K&E. Dimensions and illustrations without obligation. Subject to modifications.

Voith Turbo GmbH & Co. KG Electronic Drive Systems Voithstr. 1 74564 Crailsheim, Tel. +49 7951 32-470 Fax +49 7951 32-605 [email protected] www.voithturbo.com/actuation-control-turbomachinery