Danfoss AVT/VGS Data sheet

TR(TW)700

Data sheet

Temperature controller for steam (PN 25)

AV T / VGS - external thread

Description

The AVT / VGS controller is a self-acting proportional temperature controller developed primarily for steam or hot water applications for temperatures up to 200 °C. Controller closes on rising temperature.

The controller has a control valve VGS, thermostatic actuator and handle for temperature setting. Thermostatic actuator consist of bellows, capillary tube and sensor.

The temperature controller is type-tested according to EN 14597 and can be used in combinations with safety temperature monitors STM and safety temperature limiters STL.

Main data:

• DN 15-25

• kVS 1.0 - 6 . 3 m3/h

• PN 25

• Setting ranges:

−10 … 40 °C / 20 … 70 °C / 40 … 90 °C / 60 … 110 °C and

10 … 45 °C / 35 … 70 °C / 60 … 100 ° C / 85 … 125 °C

• Temperature:

• Steam / circ. water / glycolic water up to 30 %:

2 … 200 °C

• Connections:

• Ext. thread (weld-on, thread and flange

tailpieces)

• Flow and return mounting.

Ordering

Example: Temperature controller for steam, DN 15; kVS 1.6; PN 25; setting range 40 … 90 °C; T

- 1× VGS DN 15 valve Code No: 065B0787

- 1× AVT thermostatic actuator, 40 … 90 °C

Code No: 065-0602

Option:

- 1× Weld-on tailpieces Code No: 0 03H6908

The valve will be delivered (assembled) together with an adapter M34 × M45.

200 °C; ext. thread

max

Picture

DN k

(mm) (m3/h)

20 4.5 G 1 A 065B0789

25 6.3 G 1¼ A 065B0790

1.0

1.6 065B0787

3.2 065B0788

Cylindrical external thread acc. to

Connection Code No.

ISO 228/1

VGS Valve

Adapter M34 × M45 fo r connection to AVT thermos tat is factory assembled on t he valve.

(info: Adapter M34 × M30 fo r connection to AMV(E) electri cal actuators is part of t he valve delivery too.)

AVT Thermostatic actuator

Picture For valves

conic male th read EN 10226 -1

without imme rsion pocket

DN 15-25

Setting range

(°C)

−10 … + 4 0

20 … 70 065-0601

40 … 90 065-0602

60 … 110 065-0603

10 … 45

35 … 70 065-0605

60 … 100 065-0606

85 … 125 065-0607

Temperature sensor with brass immersion

pocket, length, connection

210 mm, R ¾

255 mm, R ¾

1) 2)

065B0786

G ¾ A

Code No.

065-0600

065-0604

VD.JK.C5.02 | 1

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Ordering (continuous)

Accessories for valves

Picture Type designation DN Connection Code No.

Weld-on tailpieces

20 003H6909

25 00 3H6910

External thread tailpieces

Conical ex t. thread acc. to

20 R ¾ 003H6903

25 R 1 003H6904

EN 10226 -1

R ½ 0 03H6902

Flange tailpieces

20 003H 6916

Flanges PN 25, acc. to EN 1092-2

25 0 03H6 917

Accessories for thermostats

Picture Type designation PN Material Code No.

Immersion pocket 25

Adapter

Stainless steel, mat. No. 1.4435 06 5-4 417

M34 × 1.5 mm / M45 × 1.5 mm 003H6927

Brass 065- 4416

Combination piece K2 003H6855

Combination piece K3 003H6856

Not for AVT th ermostatic actuator code n umbers: 065-0604, 065-0605, 065-0606, 065-0607

Adapter for VGS comb inations with thermostatic ac tuators AVT, temperature monito rs STM and temperature limite rs STL

Service kits

Picture Type designation for valves DN k

15 3.2

Valve body extension with stuf fing box

25 6.3

Housing of sensor stuffing box

for sensors Code No.

AVT R ¾ 065 -4421

003H6908

003H 6915

Code No.

003H687720 4.5

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Data sheet Temperature controller for steam AVT/VGS (PN 25)

Technical data

Valves

Nominal diameter DN 15 20 25

kVS value m3/h 1.0 1.6 3.2 4.5 6.3

Stroke mm 3 5

Control ratio >1: 50

Control characteristic linear

Cavitation factor z ≥ 0.6 ≥ 0.55

Leakage acc. to standard IEC 534 % of k

Nominal pressure PN 25

Max. differential pressure bar 10

Media Steam / Circulat ion water / gl ycoli c water up t o 30 %

Media pH Min. 7, max. 10

Media temperature °C 2 … 20 0

Connections

Materials

Valve body Red bronze CuSn5ZnPb (Rg5)

Valve seat Stainless steel, mat. No. 1.4571

Valve cone Stainless steel, mat. No. 1.4122

Pressure relieve system Bellows

valve External thread

tailpieces Weld-on, external thread and flange

≤ 0.05

Thermostatic actuator

Setting range X

Time constant T acc. to EN 14597 s max. 50 (210 mm), max. 30 (255 mm)

Gain K

Max. adm. temperature at sensor 50 °C above maximum setpoint

Max. amb. temperature at thermostat °C 0 … 70

Nominal pressure sensor

Nominal pressure immersion pocket

Capillary tube length 5 m (210 mm), 4 m (255 mm)

Materials

Temperature sensor Cooper

Immersion pocket

Handle for temp. setting Polyamide, glass fiber-reinforced

Scale carrier Polyamide

for sensor 210 mm

Ms design Brass, nickel-plated

Stainless steel design Mat. No. 1.4435 (210 mm)

°C

mm/°K

PN 25

−10 … 4 0 / 20 … 70 / 40 … 90 / 60 … 110 10 … 45 / 35 … 70 / 60 … 100 / 85 … 125

0.3 (210 mm), 0.7 (255 mm)

Application principles

VD.JK.C5.02 | 3

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Combinations

Example: Temperature controller with safety temperature monitor for steam, DN 15, kVS 1.6, PN 25, setting range 40 … 90 °C, T

- 1× VGS DN 15 valve Code No: 065B0787

- 1× AVT thermostatic actuator, 40 … 90 °C Code No: 065-0602

- 1× STM thermostat, 30 … 110 °C

Code No: 065-0608

- 1× K2 combination piece Code No: 003H6855

Products will be delivered seperatly.

Note:

For safety te mperature monitor STM / VGS data and safety temperatu re limiter STLS d ata see relevant data sheet

200 °C, ex t. thread

max

AVT / VGS

- temperature controller

AVT / AVT / VGS

- two temperature controllers

STM / AVT / VGS

- temperature controller with safety temperature monitor for steam

Temperature controllerInstallation positions

Up to media temperature of 160 °C the controllers AVT / VGS can be installed in any position.

STM / AVT / AVT / VGS

- two temperature controllers with safety temperature monitor for steam

For higher temperatures the controllers AVT / VGS have to be installed horizontal and in horizontal pipes with the actuator oriented downwards.

4 | VD.JK.C5.02

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Installation positions

(continuous)

Temperature sensor

The place of installation must be chosen in a way that the temperature of the media is directly taken without any delay. Avoid overheating of temperature sensor. The temperature sensor must be immersed into the media in its full length.

Temperature sensor 210 mm R¾”:

• The temperature sensor may be installed in any position.

Temperature sensor 255 mm R¾”:

• The temperature sensor must be installed as shown on the picture.

Pressure temperature diagram

CuSn5ZnPb (Rg5) PN 25

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-3).

VD.JK.C5.02 | 5

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Valve sizing

6 | VD.JK.C5.02

Steam valve sizing is based on 40 % drop of the steam pressure across the valve when fully open. At this condition the steam is travelling at or close to its critical velocity (approx. 300 m/s) and throttling would occur over the full valve stroke.

If the steam is travelling slower than this, then the first part of the valve stroke would merely increase the velocity of the steam without reducing the volumetric flow.

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Valve sizing (continuous) 1. For saturated steam

Given data:

Flow rate: 70 kg/h Absolute inlet pressure: 5 bar (500 kPa)

Remark:

For this example follow dashed line

The absolute inlet pressure is 500 kPa. Critical pressure drop (40 % of 500 kPa) is 200 kPa. Locate the diagonal line corresponding to the pressure drop of 200 kPa (line A-A).

Read the absolute inlet pressure on the lower left hand scale (point B), and draw a horizontal line across until it meets the pressure drop diagonal A-A at point C.

From this point C extend a vertical line upwards until it meets the horizontal line representing the steam flow of 70 kg/h from point D. The intersection of this is point E.

The nearest diagonal kVS line above this is line F-F with a kVS of 1.6. If the ideal valve size is not available the next largest size should be selected to ensure design flow.

The pressure drop through valve at the flow rate is found by the intersection of the 70 kg/h line with F-F (point E’) and dropping a vertical line downwards; this actually hits the horizontal line for 500 kPa absolute inlet pressure (point E’’) at a pressure drop diagonal of 90 kPa. This is only 18 % of the pressure drop accross the valve and the control quality will not be good until the valve has partially closed. As with all steam valves this compromise is necessary since the next smaller valve would not pass the required flow (maximum flow would be about 60 kg/h; point P).

The maximum flow for the same inlet pressure is found by extending the vertical line (C-E) through point E until it crosses the kVS 1.6 line F-F (point G) and reading off the flow (90 kg/h).

2. For superheated steam

Given data:

Flow rate: 170 kg/h Absolute inlet pressure: 5 bar (500 kPa) Steam temperature: 190 °C

Remark:

For this exampl e follow dotted line The procedur e for superheated steam is muc h the same as for saturated steam , but uses a different flow s cale which slightly elevates the read ings according to the degree of sup erheat.

As before, the diagonal critical pressure drop line A-A is located at 40 % of 500 kPa (200 kPa). The horizontal inlet pressure line through point B is now extended to the left to read off the corresponding saturated steam temperature at point H (150 °C). The difference between the saturated steam temperature and the superheated steam temperature is 190 °C − 150 °C = 40 °C (see point J).

The superheated steam flow 170 kg/h is found on the upper right hand scale (point K). From here the diagonal line is followed down until it meets a vertical line from the steam temperature elevation (40 °C, point J) at point L.

As before, the horizontal line through point B is drawn to cut line A-A at point C. The point where the vertical line from point C meets the horizontal line from point L is the operating point (point M). This horizontal line, L-M, is the corrected flow line. The nearest diagonal line above this is line N-N with a kVS 3.2. A vertical line dropped from the intersection of L-M line with line N-N (point M’) intersects the 500 kPa absolute inlet pressure line (point M’’) at a pressure drop diagonal of about 150 kPa. This is about 30 % of the pressure drop accross the valve which will give reasonable control quality (compared to recommended ratio of 40 %).

VD.JK.C5.02 | 7

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Design

1. Valve VGS

2. Valve insert

3. Pressure relieved valve cone

4. Valve stem

5. Valve body extension

6. Union nut

7. Thermostatic actuator AVT

8. Thermostat stem

9. Bellows

10. Setting spring for temperature control

11. Handle for temperature setting, prepared for sealing

12. Scale carrier

13. Capillary tube

14. Flexible protected pipe

(only at AVT 255 mm)

15. Temperature sensor

16. Immersion pocket

17. Sensor stuffing box

18. Housing of sensor stuffing box

Function By increasing of media temperature valve

AVT 255

Media temperature changes cause pressure changes in temperature sensor. Resulting pressure is being transferred through the capillary tube to the bellows. Bellows moves

AV T 210

cone moves towards the seat (valve closes), by decreasing of media temperature valve cone moves away from the seat (valve opens).

thermostat stem and opens or closes the valve.

Handle for temperature setting can be sealed.

Settings

Temperature setting

Temperature setting is being done by the adjustment of the setting spring for temperature control. The adjustment can be done by means of handle for temperature setting and / or temperature indicators.

Adjustment diagram Temperature setting

Relation between scale numbers 1-5 and closing temperature.

Note: The va lues given are approximate

AVT Thermostat ... 210 mm

AVT Thermostat ... 255 mm

Note:

STM Safety te mperature monitor (actuato r): temperature sca le is already written on th e product

8 | VD.JK.C5.02

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Dimensions

AVT / VGS

15 65 257 34

20 70 257 34

25 75 257 37

L H H

150

Ø 76

VGS

15 178 1.3

20 178 1.4

25 178 1.6

H Weight

(mm) (kg)

AVT

Typ e Weight

sensor 210 mm

sensor 255 mm 1.6

Ø 16

1.5

223

SW 22

AV T 210

Ø 16

M22×1

Immersion pocket

215

SW 27

AV T 210

Ø 19

R ¾

SW 22

AVT 255

266

R ¾

VD.JK.C5.02 | 9

Data sheet Temperature controller for steam AVT/VGS (PN 25)

Dimensions (continuous)

SW 27

R ¾

Housing of sensor

stuffing box

DN R

SW d L1 2)L2L3k d

15 ⁄ 32 (G ⁄A) 21 130 120 139 65 14 4

20 ⁄ 41 (G 1A) 26 150 131 154 75 14 4

25 1 50 (G 1⁄A) 33 160 145 159 85 14 4

Conical ex t. thread acc. to EN 10226-1

Flanges PN 25, acc. to EN 1092-2

M22×1

Combination piece K2

109

108

109

Combination piece K3

45°

M34

M45

Adapter

M34 × 1.5 mm / M45 × 1.5 mm

10 | VD.JK.C5.02

Data sheet Temperature controller for steam AVT/VGS (PN 25)

VD.JK.C5.02 | 11

Danf already on order pro All trademarks in this material are property of the respec

Data sheet Temperature controller for steam AVT/VGS (PN 25)

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

vided that such alterations can be made without subsequential changes being necessary eady agreed.

12 | VD.JK.C5.02

Danfoss AVT/VGS Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual