Danfoss VFG 2, VFGS 2 Data sheet

Data sheet

Pressure reduction controller (PN 16, 25, 40)

AFD / VFG 2(1) - for water AFD / VFGS 2 - for steam

Description

Ordering

Example 1: Pressure reduction controller; for water; DN 15; kVS 4.0; PN 16; metallic sealing; setting range 0.15-1.5 bar; T

150 °C; flange;

max

– 1× VFG 2 DN 15 valve Code no: 065B2388 – 1× AFD actuator Code no: 003G1005 – 1× Impulse tube set AF Code no: 003G1391

Products will be delivered separatly.

Impulse tube set AF

The controller is a self-acting pressure reduction controller primarily for use in district heating systems. The controller is normally open and closes on rising pressure.

VFG 2 Valves (metallic sealing cone) – for water

Picture

(mm)

15 4.0 20 6.3 065B2389 065B2402 065 B2412 25 8.0 0 65B2390 065B2403 06 5B2413 32 16 065B 2391 065B2404 06 5B2414 40 20 065B2392 065B2405 0 65B2415 50 32 065B2393 065B2406 065B 2416 65 50 065B2394 065B2407 0 65B2417

80 80 065B2395 065B2408 065B 2418 100 125 065B2396 065B2409 065B2 419 125 160 065B2397 0 65B2 410 065B2420 150 280 200 320 065B2399 – 065B2422 250 400 065B2400 – 065B2423

(m3/h)

Connections

Flanges acc. to

EN 1092-1

The controller has a control valve, an actuator with one control diaphragm and a spring for pressure setting.

Further on three valve versions are available: – VFG 2 for water, with metallic sealing cone – VFG 21 for water, with soft sealing cone – VFGS 2 for steam, with metallic sealing cone

Main data: ∙ DN 15-250 ∙ kVS 4.0-400 m3/h ∙ PN 16, 25, 40 ∙ Setting range:

0.05-0.35 bar / 0.15-1.5 bar / 0.1-0.7 bar /

0.5-3 bar / 1-6 bar / 3-12 bar / 8-16 bar

∙ Temperature:

– VFG -Circulation water / glycolic water up to

30 %: 2 … 150 / 200 °C

– VFGS -Steam / circulation water / glycolic

water up to 30 %: 2...200/300/350

∙ Connections:

– Flange

(°C)

150

max

Code No.

PN 16 PN 25 PN 40

065B2388

065B2398

(°C)

200

150

max

Code No.

065B2401 06 5B 2411

– 065B2421

150 200 250

At temperature s above 150 °C only with seal p ots (see Accessories)

Valve has valve body ex tension (VBE)

280 –

320 – – On request

400 – – On request

200

– On request

Data sheet Pressure reduction controller AFD/VFG, VFGS

Ordering (continuous)

Example 2: Pressure reduction controller; for water; DN 15; kVS 4.0; PN 25; metallic sealing; setting range 0.15-1.5 bar; T

200 °C; flange;

max

– 1× VFG 2 DN 15 valve Code no: 065 B2401 – 1× AFD actuator Code no: 003G1005 – 1× Impulse tube set AF Code no: 003G1391 – 1× Seal pot V1 Code no: 003G1392

Products will be delivered separatly.

Seal pot V1

Impulse t ube set AF

Example 3: Pressure reduction controller; for steam; DN 15; kVS 4.0; PN 25; metallic sealing; setting range 0.15-1.5 bar; T flange;

– 1× VFGS 2 DN 15 valve Code no: 065B2443

1× AFD actuator

Code no: 003G1005 – 1× Impulse tube set AF Code no: 003G1391 – 1× Seal pot V1 Code no: 003G1392 – 1× Stem extension ZF4 Code no: 003G1394

max

350 °C;

VFG 21 Valves (soft sealing cone) – for water

Picture

(mm)

15 4.0 20 6.3 065B2503 25 8.0 065B2504 32 16 065B2505 40 20 065B2506 50 32 065B2507 65 50 065B2508

80 80 065B2509 100 125 065B2 510 125 160 06 5B2 511 150 280 200 320 065B2513 250 400 065B 2514

Note: othe r valves available on special r equest.

(m3/h)

VFGS 2 Valves (metallic sealing cone) – for steam

Picture

(mm)

(m3/h)

15 4.0 2.5 20 6.3 4.0 065 B2431 065B2444 065B2454 25 8.0 6.3 065B2432 065B2445 0 65B2455 32 16 10 065B2433 065B2446 065B2456 40 20 16 065B2434 065B2 447 065B24 57 50 32 25 065B2435 065B2448 065B2458 65 50 40 065B2436 065B2449 065B2459

80 80 63 065B2437 065B2450 065B2460 100 125 100 065B2438 065B 2451 0 65B24 61 125 160 125 065B2439 065B2452 065B2462

150 200 250

280 200

320 225 065B24 41 – 065B2464

400 280 065B2442 – 065B2465

(m3/h)

(° C)

150

max

Connections

Flanges acc. to

EN 1092-1

Code No.

PN 16 PN 25 PN 40

065B2430

(° C)

350

max

065B2443 0 65B2453

065B2440

300

(°C)

max

Code No.

PN 16

065B2502

150

06 5B2512

150

Code No.

– 065B2463

Products will be delivered separatly.

Seal pot V1

Stem extension ZF4

Impulse t ube set AF

Valves with built in fl ow divider for noise reduc tion (see accessories)

Max. media tem peratures for valves VFGS 2 (in steam ap plications always accessorie s have to be used – see table below)

Valve has valve body ex tension (VBE) and pre- installed flow divide r

Max. media temperatures and use of accessories

Steam temp.

DN 15-125 DN 150-250 D N 15-125 DN 150-250 D N 15-12 5 DN 150-250

up to 150 °C SP SP + VBE

up to 200 °C 200 … 300 °C SP + ZFx SP + ZFx SP + VBE 300 … 350 °C SP + ZFx SP + ZFx

Remark – following access ories have to be used as stated in table ab ove:

SP – Seal pot ZF – Stem extensi on VBE – Valve with valve body ex tension

– Valve is not to be used

See Accessories

PN16 PN25 PN40

SP SP SP + VBE

2 | AI194086471473en-001201 © Danfoss | 2018.11

Data sheet Pressure reduction controller AFD/VFG, VFGS

Ordering (continuous)

AFD Actuators

Picture

Pressure setting range

(bar)

8-16 3-12 003G1001

For DN Code No.

DN 15-125

1-6 DN 150-250 003G1413 1-6

0.5-3 003G1003

DN 15-125

0.15 -1.5

0.1-0.7 003G1004

DN 15-250

0.05-0.35 003G1006

Accessories

Picture Type designation Description Connections Code No.

– 1× Copper tube Ø10 × 1 × 1500 mm

Impulse tube set AF

Seal pot V1

Seal pot V2

Compression fitting

port B

Combination piece KF3

Combination piece KF2

port A

– 1 × compression fitting for imp. tube

connection to pipe (G ⁄)

– 2 × socket Capacit y 1 litre; with compression fittings for

imp. tube Ø10 Capacit y 3 litre; with compression fittings for

imp. tube Ø10, for actuator size 630 cm For impulse tube Ø10 connections to

controller For combination with pressure actuators.

Electrical actuator connected on side (port B) only for ON/OFF function

For combination with thermostat - side connection to port B

– 003G1391

– 003G1392

– 003G1403

G ⁄ 003G1468

G 1⁄ / 2× G 1⁄

003G1000

003G1002

003G1005

00 3G1441

00 3G1440

Shut off valve

00 3G1401

For impulse tube Ø10 –

Throttle valve 065B2909

Flow dividers for VFGS 2

Flowdivider DN 15, 20 Flowdivider DN 25, 32 065B2776 Flowdivider DN 40, 50 065B2777

–

Flowdivider DN 65, 80 065B2778

065B2775

Flowdivider DN 100, 125 065B2779

Seal pot has to be use d on impulse tubes when T

Consist of a nipple, com pression ring and nut

Flowdividers can b e used in steam application f or noise reduction ; af ter instaling into the valve, valve’s k vs is reduced – see VFGS 2

table

Port A - for connect ion of any type of actu ator

Accessories – Stem extensions

Picture Typ e

ZF4, 5 ZF6D40

Stem extensio n has to be used always when T

Condensate

ZF6 can be used for stroke p osition indication

For valves DNT

ZF4 ZF5 350 Yes 003G1396 ZF6 200

15-125

D40 200 Yes 065B2986

≥ 200 °C and alwa ys in steam applications

max

(°C)

max

Media

water steam

350

Yes

> 200 °C

max

Yes

Used for

sealing

Yes

Used for

isolation

Yes

–

Code No.

003G1394

003G1393

AI194086471473en-001201 | 3© Danfoss | 2018.11

Data sheet Pressure reduction controller AFD/VFG, VFGS

Ordering (continuous)

Technical data

Service kits

Picture Type designation

Valve insert

Stuffing cone (with EPDM O-rings) 003G1464

(mm)

(m3/h)

for VFG 2 for VFG 21 for VFGS 2

15 4.0 065B2796 065B2790 065B2802

20 6.3 065B2797 065B2791 065B2803 25 8 32 16 40 20 50 32 65 50

80 80 100 125 125 160

065B2798 0 65B2792 065B2804

065B2799 0 65B2793 065B2805

065B2800 065B2794 065B2806

065B2801 065B2795 065B2807

150 280 065B2964 065B2966 – 250 400 065B2965 – –

Code No.

Valves

Nominal diameter DN 15 20 25 32 40 50 65 80 10 0 125 150 200 250

kVS value

kVS value Cavitation factor z 0.6 0.6 0.6 0. 55 0.55 0.5 0.5 0.45 0.4 0.35 0.3 0.2 0.2

Leakage acc. to standard IEC 534 (% of kVS)

VFG 2 ≤ 0.03 ≤ 0.05 VFG 21 ≤ 0.01 VFGS 2 ≤ 0.03 ≤ 0.05

Nominal pressure PN 16, 25, 40

Max. differential pressure

Media

PN 16 PN 25, 40 20 VFG 2, VFG 21 Circulation water / glycolic water up to 30 % VFGS 2 Steam /circulation water / glycolic water up to 30%

Media pH Min. 7, max. 10

VFG 2

Media temperature

VFG 21 2 … 150

VFGS 2

Connections Flange

Materials

PN 16 Grey cast iron EN-GJL-250 (GG-25)

Valve body

PN 25 Ductile iron EN-GJS-400(GGG-40.3) PN 40 Cast steel GP240GH (GS -C 25)

Valve seat Stainless steel, mat. No. 1.4021

Valve cone Stainless steel, mat. No. 1.4404

Sealing

VFG 2, VFGS 2 Metal VFG 21 EPDM

Pressure relieve system Bellows (Stainless steel, mat. No. 1.4571) Diaphragm (EPDM)

Valves with built in f low divider for noise redu ction (see Accessories)

At temperature s above 150 °C only with seal p ots (see Accessories)

In steam aplicatio ns always accessories have to be used – se e table on page 2 below

On Request

4.0 6.3 8.0 16 20 32 50 80 125 160 280 320 400

m3/h

2.5 4.0 6.3 10 16 25 40 63 100 12 5 – – –

bar

2 … 150 / 2 … 200

15 12 10

°C

2...200 / 2...300 /2...350 2 … 300

2 … 150 (200 4))

Stainless steel,

mat. No. 1.4313

Stainless steel,

mat . No. 1.4021

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Data sheet Pressure reduction controller AFD/VFG, VFGS

Technical data (continuous)

Application principles

Actuators

Typ e AFD

Actuator size cm Max. operating pressure bar 25 25 25 25 16

Pressure set ting ranges and spring colours

Materials

Actuator housing Steel, mat. No. 1.0338, zinc plated Control diaphragm EPDM (Rolling; fibre enforced)

Actuator and i mpulse tubes minimum temp erature is 2 °C to prevent media fr om freezing

bar

32 80 160 250 630

black red red yellow blue red yellow yellow

8-16 3-12 1-6 0.5-3 1- 6 0 .15-1.5 0.1-0.7 0.05-0.35

Combinations

Example

Pressure reduction and temperature controller AFD / AFT06 / VFG 2; kVS 4.0; DN 15; PN 16: T

0.15-1.5 bar; range 20 … 90 °C

– 1× VFG 2 DN 15 valve Code no: 065B2388 – 1× AFD actuator Code no: 003G1005 – 1× AFT06 thermostat Code no: 065 -4391 – 1× Combination piece KF2 Code no: 00 3G144 0 – 1× Impulse tube set AF Code no: 003G1391

Parts will be delivered separately.

Note:

For AFT 06 and STFW thermostat data see relevant data sheet

150 °C;

max

Direct-connected heating system Indirectly connected heating system

AFT06 / KF2 / AFD / VFG STFW / KF2 / AFD / VFG

AI194086471473en-001201 | 5© Danfoss | 2018.11

Data sheet Pressure reduction controller AFD/VFG, VFGS

Installation position

Pressure temperature diagram

Working area is below P-T line and it ends at T

for each valve

max

DN 15-80 T

≤ 120 °C

max

The controllers can be installed in any position.

DN 15-80 T

≤ 120 °C

max

VFG/VFU/VFGS PN 16

DN 15-80 T

> 120 °C; DN 100-250

max

The controllers can be installed in horizontal pipes only, with a pressure actuator oriented downwards.

DN 15-80 T

> 120 °C; DN 100-250

max

EN -GJL-2 50 (GG -25)

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-2)

VFG PN 25

EN-GJS- 400 (GGG-40.3)

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-2)

VFG PN 40

EN-GP-240-GH (GS- C 25)

VFGS PN 25

120

VFGS PN 40

EN-GJS-400 (GGG-40.3)

EN-GP-240-GH (GS- C 25)

120

Maximum allowed operating pressure as a function of media temperature (according to EN 1092-1)

6 | AI194086471473en-001201 © Danfoss | 2018.11

Data sheet Pressure reduction controller AFD/VFG, VFGS

Sizing – water

Pressure reduction controller has to control

6.0 bar behind the controller. Max. flow through the system is less than 4.0 m3/h, min. flow pressure is 7.5 bar.

Given data:

= 35 m3/h

max

= 7.5 bar

1 min

= 6.0 bar

reduced

Nominal pressure PN 25 The min. differential pressure across the controller is calculated from the formula:

p

= p

p

AFD

= 1.5 bar

AFD

1 min

− p

reduced

= 7.5 − 6.0

kv value is calculated according to formula:

AFD



5.1

max





kv = 28.6 m3/h

Solution:

The example selects VFG2 DN 65, kVS value 50, with pressure actuator setting range 3-12 bar.

Data sheet Pressure reduction controller AFD/VFG, VFGS

Sizing – steam

Max. ∆p in low pressure steam application variance from 0.5 bar to 6 bar (see page 2)

mass flow of saturated water steam (kg/h)

mass flow of superheated water steam (kg/h)

Critical Pressure Drop (kPa)

Absolute Inlet Pressure (bar)

Super heated

steam

temperature (°C)

Saturated Steam Temperature (°C)

Steam valve sizing is based on 40 % of the absolute steam pressure (immediately upstream of the valve) being dropped 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 will occur over the full valve stroke. If the steam is travelling slower than this then the first part of the valve stroke will merely increase the velocity of the steam without reducing the volumetric flow.

Data sheet Pressure reduction controller AFD/VFG, VFGS

Control valve sizing diagram for steam

(continued)

1 For saturated steam

Design data:

Flow rate: 600 kg/h Absolute inlet pressure: 5 bar (500 kPa)

– follow dashed line –

The absolute inlet pressure is 500 kPa. 40% of this 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 extend a vertical line upwards until it meets the horizontal line representing the steam flow of 600 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 16 (point E’). 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 600 kg/h line with F-F (point E’) and dropping a vertical; this actually hits the horizontal line for 500 kPa (point E’’) inlet pressure at a pressure drop diagonal of 70 kPa (point M). This is only 14 % of the inlet pressure 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 have been about 480 kg/h).

The maximum flow for same inlet pressure is found by extending the vertical line (C-E) through point E until it crosses the kVS 16 line F-F (point E’’’) and reading off the flow 900 kg/h (point D’ ).

2 For superheated steam

Design data:

Flow rate: 400 kg/h Absolute inlet pressure: 5 bar (500 kPa) Steam temperature: 190 °C

The procedure for superheated steam is much the same as for saturated steam, but uses a different flow scale which slightly elevates the readings according to the degree of superheat.

– follow dotted line –

As before, the diagonal pressure drop line A-A is located as before for 40 % of 500 (200 kg/h). The horizontal inlet pressure line through point B is now extended to the left to read off the corresponding saturated steam temperature at point G (150 °C). The difference between the saturated steam temperature and the superheated steam temperature is 190 °C – 150 °C = 40 °C (point N).

The superheated steam flow is found on the upper right hand scale, point H, and the diagonal line is followed down from here until it meets a vertical line from the steam temperature elevation (40 °C) at point J.

As before, the horizontal line through point B is drawn to cut line A-A at point C and the point where the vertical line from this point meets the horizontal line from point J is the operating point (point K). This horizontal line, J-K, is the corrected flow line. The nearest diagonal line above this is for kvs 8 (point K’). A vertical line

dropped from the intersection of J-K with the kvs 8 line intersects the 500 kPa inlet pressure line (point K’’) at a pressure drop diagonal of about 150 kPa (point P). This is about 30% of the inlet pressure which will give reasonable control quality (compared to recommended ratio of 40%).

Solution:

The example selects AFD DN 32, kVS value 16, with pressure setting range 0.15-1.5 bar

Solution:

The example selects AFD DN 25, kVS value 8, with pressure setting range 0.15-1.5 bar

Data sheet Pressure reduction controller AFD/VFG, VFGS

Design

1. Valve body

2. Cover

3. Valve seat

4. Valve insert

5. Pressure relieved valve cone

6. Valve stem

7. Bellows for pressure relief of

valve cone

8. Actuator

9. Diaphragm for pressure relief

of valve cone

10. Control diaphragm for

pressure control

11. Setting spring for pressure

control

12. Adjuster for pressure setting,

prepared for sealing

13. Stuffing cone

14. Union nut

15. Compression fitting for

impulse tube

16. Upper casing of diaphragm

17. Lower casing of diaphragm

18. Air space bore

19. Valve body extension

20. Shut off valve for water filling

21. Closing plug

AFD /VFG(S) DN 15-125

3 5

6 4

Function The pressure behind of the control valve is

being transferred through the impulse tube to the actuator chamber and act on control diaphragm for pressure control. On the other side of the diaphragm atmospheric pressure is acting (through air space bore). Control valve is normally opened. It closes on rising pressure and opens on falling pressure to maintain constant pressure.

VFG DN 150-250, T

max

150 °C

VFG DN 150-250, T

VFGS DN 150-250 T

max

200 °C

300 °C

Settings Pressure setting

Pressure setting is being done by the adjustment of the setting spring for pressure control. The adjustment can be done by means of spring for pressure setting and pressure indicators.

Data sheet Pressure reduction controller AFD/VFG, VFGS

Dimensions

VFG(S) DN 15-125

VFG DN 150-250

VFG(S) DN 150-250

with valve body extension

up to 200 (300) °C

VFG 2, VFG 21, VFGS 2 Valves

DN 15 20 25 32 40 50 65 80 10 0 125 150 200 250

L B 213 213 239 239 241 241 276 276 381 381 326 354 401 H 267 267 304 304 323 323 370 370 505 505 505 591 6 61

PN 16 / 25

Weight

PN 40 30 32 .5 60.5 69 141 253 333

Weight (valve with body extension)

PN 16 / 25

PN 40 179 336 505

130 150 16 0 180 200 230 290 310 350 400 480 600 730

kg 7. 5 8.5 10 12 15 18

27. 5 30 58 68 115 185 323

620 852 1199

700 994 1359

154 301 469

Data sheet Pressure reduction controller AFD/VFG, VFGS

120

240

Ø 89

298

Ø 140

Dimensions (continuous)

AFD (32/80/250/630 cm2)AFD (160 cm2)

AFD Actuator

Actuator size cm232 80 16 0 250 630 Ø A mm 17 2 17 2 250 263 380 H mm 435 430 710 470 520 Weight kg 7. 5 7. 5 32.4 13 28

ø60

Ø10

Seal pot V1

SW 22

Shut off valve

110

Compression fitting

180

Valve stem extension

ZF4, ZF5

SW19

G⁄

Comb. piece

KF2, KF3

Valve stem extension

ZF6

Seal pot V2

155

Valve stem extension

D40

Danfoss VFG 2, VFGS 2 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual