Danfoss AFQ 2, VFQ 22, VFQ 221 Data sheet

Data sheet

Flow controller (PN 16, 25, 40)

AFQ 2 / VFQ 22(1) – return and flow mounting

Description

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Ordering

Example 1:
Flow controller; DN 65; kVS 60; PN 16;
metallic sealing; flow restrictor
∆pb 0.2 bar; T

– 1× VFQ 22 DN 65 valve
Code no: 065B5570
– 1× AFQ 2 actuator
Code no: 003G5600
– 1× AFQ DN 65 impulse tubes
Code no: 003G18 43

150 °C; flange;

max

VFQ 22 Valve (metallic sealing cone)

Picture

DN

(mm)

100 160 065B5572 065B5579 065B5586

125 250 065B5573 065B5580 065B5587

150 380 065B 5574 065B5581 065B5588

200 650 065B5575 0 65B5582 065B5589

250 800 065B5576 065B5583 065B5590

k

VS

(m3/h)

65 60

80 80 065B5571 065B5578 065B5585

Flanges acc. to EN 1092-1 150

Connections

The controller is a self-acting flow controller
primarily for use in district heating systems. The
controller closes when set max. flow is exceeded.
The controller has a control valve with adjustable
flow restrictor and an actuator with one control
diaphragm.

Further on two valve versions are available:

∙ VFQ 22 with metallic sealing cone
∙ VFQ 221 with soft sealing cone

Main data:
∙ DN 65-250
∙ kVS 60-800 m3/h
∙ Flow range 5.6-500 m3/h
∙ PN 16, 25, 40
∙ Flow restrictor ∆pb: 0.2 bar or 0.5 bar
∙ Temperature: – Circulation water / glycolic

water up to 30%: 2 … 150°C

∙ Connections: Flange

T

(°C)

max.

PN 16 PN 25 PN 40

065B5570 065B5577 065B558 4

Code No.

Products will be delivered
separately.

Impulse tubes AFQ 2

VFQ 221 Valve (soft sealing cone)

Picture

DN

(mm)

65 60

80 80 065B5601 065B5608 06 5B5615

100 160 065B5602 065B5609 0 65B5616

125 250 065B5603 065 B5610 0 65B 5617

150 380 065B5604 0 65B5 611 065 B5618

200 650 065B5605 0 65B5 612 065B5 619

250 800 065B5606 0 65B5 613 065B5620

k

VS

(m3/h)

Connections

Flanges acc. to EN 1092-1 150

T

(°C)

max.

PN 16 PN 25 PN 40

065B5600 065B5607 0 65B5 614

Code No.

AFQ 2 Actuator

Picture

Δp setting range

(bar)

0,2

0,5

0,2

0,5

Possible combinations with DN

65 80 100 125 15 0 200 250 PN 16 PN 40

   

   

      

      

- - -

- - - 003G5601 003G5603

Actuator size

(cm2)

160

320

Code No.

003G5600 003G5602

003G5596 003G5598

003G5597 003G5599

© Danfoss | 2022.04 AI373552176233en-010103 | 1

Data sheet AFQ 2/VFQ 22(1)

Ordering (continuous) Impulse tubes

Picture Typ e For controller

Impulse tubes AFQ 2

Service kits

Picture Typ e

Pressure control
insert VFQ/Q/22

Pressure control

insert VFQ/Q/221

Pressure stuffing box VFQ/Q/221

for valve DN

(mm)

65

80 003 G1850

100 003 G1851

125 003G18 52

150 00 3G1853

200 003 G1854

250 003 G1855

k

VS

(m3/h)

60

80 80 00 3G1801

160 100 003 G1802

250 125 003G1803

380 150 003G18 04

650 200 003G180 5

800 250 003 G1806

60 65 0 03G1807

80 80 003 G1808

160 100 003 G1809

250 125 003G1810

380 150 00 3G18 11

650 200 003 G1812

800 250 0 03G1813

PN DN Code No.

16/2 5/40

PN

(bar)

40

65 003G1800

65 -125 003G1730

150-250 003G1731

Code No.

003 G1843

Installation position

The controllers can be installed in any position.

2 | AI373552176233en-010103 © Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)

p

at z = 0,2 ... 0,6 [bar]

Inlet pressure bar p [bar]

z =

Example :

2

Technical data

VFQ 22(1) Valve

Nominal diameter DN 65 80 100 125 150 200 250

kVS value of p controller

Range of max. flow
setting

pb 1) = 0.2 bar

pb 1) = 0.5 bar

from 5.6 8 12.6 20 32 54 72

m3/h

to 28 40 63 100 160 270 360

from 8,4 12 19 30 48 68 100

to 42 60 95 150 240 340 500

60 80 160 250 380 650 800

Cavitation factor z 0.65 0.55 0.4 0.4 0.4 0. 35 0.3

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

VFQ 22 ≤ 0.03 ≤ 0.05

VFQ 221 ≤ 0.01

Nominal pressure PN 16, 25, 40

Min. differential pressure

Max. differential pressure PN 16 16

bar

Max. differential pressure PN 25/40 20

see remark

15 15 12 10 10

2)

Pressure relievement system Chamber relieved

Media Circulation water / Glycolic water up to 30 %

Media pH Min.7, ma x.1 0

Media temperature °C 2 … 150

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 / Valve cone Stainless steel, mat. No. 1.4021

Sealing EPDM

1)

∆pb – differe ntial pressure over flow rest rictor

2)

For flows sma ller than Q

->

p

max

min





Q





p









k

VS





b

AFQ 2 Actuator

bar

2

160 320

16, 4 0

Materials

Actuator size cm

Max. operating pressure

Flow restrictor differential pressure pb 0. 2 / 0.5

For valve DN 65 -125 65-2 50

Actuator housing Steel, mat. No. 1.0345, zinc plated

Control diaphragm EPDM (Rolling; fibre enforced)

Operating area

Maximum allowed differential pressure over the controller (p

max

T = 90°C

T = 100°C

T = 110°C

[bar]

max

p

) at different cavitation factors (z)

max

p = 6 bar
T = 140°C
z = 0,4

= 1,35 bar

p

max

T = 80°C

T = 130°C

T = 140°C

T = 150°C

AI373552176233en-010103 | 3© Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)

Application principles

– Return mounting

Direct-connected heating system Indirectly connected heating system

– Flow mounting

Pressure temperature
diagram

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

for each valve

max

Direct-connected heating system Indirectly connected heating system

PN 25

PN 16

EN - GJL- 250
(GG -25)

150

150

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

PN 40

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

EN-GJS-400
(GGG-40.3)

150

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

4 | AI373552176233en-010103 © Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)





2





2

0,5 > 0,37

Sizing

– Directly connected heating

system

Example 1

Motorised control valve (MCV) for mixing circuit
in direct-connected heating system requires
differential pressure of 0.5 bar (50 kPa) and flow
less than 25.000 l/h.

Given data:

Q

= 25 m3/h (25.000 l/h)

max

∆p

= 1 bar (100 kPa)

min

1)

∆p

= 0.1 bar (10 kPa)

circuit

∆p

= 0.5 bar (50 kPa) selected

MCV

2)

∆p

= 0.2 bar (20 kPa)

b

Remark:

1)

∆p

corresponds to th e required pump pressur e in the heating

circuit

circuit and is not to b e considered when sizing th e AFQ 2.

2)

∆pb is differe ntial pressure over flow rest rictor.

The total (avaliable) pressure loss across the
controller is:
∆p

= ∆p

AFQ, A

∆p

= 0.5 bar (50 kPa)

AFQ, A

min

− ∆p

= 1 – 0.5

MCV

Q

max

Possible pipe pressure losses in tubes, shut­off fittings, heatmeters, etc. are not included.
The min. required differential pressure across
the selected controller is calculated from the
formula:

kv value is calculated according to formula:

∆p

∆p

∆p

AFQ,min

AFQ,min

AFQ, A

=

=0,37

>∆p

Q

max

k

VS

AFQ,min

+∆pb=

25

+0,2

60

kv = 45.6 m3/h

Solution:

The example selects AFQ 2 DN 65, kVS value 60,
flow setting range 5.6-28 m3/h.

p

min

AFQ 2

p

b

p

AFQ

p

MCV

p

circuit

AI373552176233en-010103 | 5© Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)

( ) ( )

Sizing (continuous)

– Indirectly connected heating

system

Example 2

Motorised control valve (MCV) for indirectly
connected heating system requires differential
pressure of 0.5 (50 kPa) bar and flow less than

24.000 l/h.

Given data:

Q

= 24 m3/h (24.000 l/h)

max

∆p

= 1.0 bar (100 kPa)

min

∆p
∆p
∆p

Remark:

1)

∆pb is differe ntial pressure over flow rest rictor

= 0.1 bar (10 kPa)

exchanger

= 0.5 bar (50 kPa) selected

MCV

1)

= 0.2 bar (20 kPa)

b

The total (avaliable) pressure loss across the
controller is:
∆p

= ∆p

AFQ, A

∆p

= 1.0 − 0.1 − 0.5

AFQ, A

∆p

= 0.4 bar (40 kPa)

AFQ, A

min

− ∆p

exchanger

− ∆p

MCV

Possible pipe pressure losses in tubes, shut-off
fittings, heatmeters, etc. are not included.

The min. required differential pressure across
the selected controller is calculated from the
formula:

Solution:

The example selects AFQ 2 DN 65, kVS value 60,
flow setting range 5.6-28 m3/h.

p

Q

max

min

AFQ 2

p

b

p

AFPQ

p

MCV

p

exchanger

6 | AI373552176233en-010103 © Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)

Design

1. Valve body

2. Cover

3. Adjustable flow restrictor

4. Valve seat

5. Valve insert

6. Pressure relieved valve cone

7. Valve stem

8. Actuator

9. Control diaphragm for

differential pressure and flow
control

10. Excess pressure safety valve

11. Built in spring for differential

pressure and flow control

12. Stuffing cone

13. Union nut

14. Impulse tube

15. Compression fitting for

impulse tube

16. Upper casing of diaphragm

17. Lower casing of diaphragm

AFQ 2 VFQ 22(1), DN 65-250

Function

Settings

Flow volume causes pressure drop across the
adjustable flow restrictor. Resulting pressures
are being transferred through the impulse tubes
to the actuator chambers and act on control
diaphragm for flow control. The flow restrictor
diff. pressure is controlled and limited by means
of built-in spring for flow rate control. Control
valve closes on rising differential pressure and
opens on falling differential pressure to control
max flow.

Flow setting

Flow setting is being done by the adjustment of
the flow restrictor position. The adjustment can
be performed on the basis of flow adjustment
diagram (see relevant instructions) and/or by the
means of heat meter.

AI373552176233en-010103 | 7© Danfoss | 2022.04

Data sheet AFQ 2/VFQ 22(1)

Dimensions

L

V

H

H

B

VFQ 22(1) DN 65-250

VFQ 22, VFQ 221 Valves

Weight

PN 16 PN 25 PN 40

DN

L B H H

V

mm kg

65 290 237 473 396 28 29 31

80 310 237 473 396 33 34 36

100 350 272 5 47 472 52 53 57

125 400 268 582 514 71 72 79

150 480 326 670 610 12 3 126 135

200 600 3 61 773 713 230 236 286

250 730 419 843 783 382 392 4 41

A

H

AFQ 2 Actuator

ØA

AFQ 2 Actuator

Size ØA H

2

cm

A

mm kg

160 230 200 8 10

320 300 200 13 19

Total installation heig ht of the controller (VFQ 22(1) valve
+ AFQ 2 pressure act uator) is sum of HV and H

Weight

PN 16 PN 40

A

Ø10

40

G⁄

SW19

Compression fitting

© Danfoss | DCS-SGDPT/SI | 2022.048 | AI373552176233en-010103