Data sheet
Differential pressure relief controller (PN 16, 25, 40)
AFPA / VFG 2(1)
Description
Ordering
Example 1:
Differential pressure relief
controller;
DN 15; kVS 4.0; PN 16; metallic
sealing; setting range 0.15-1. 2 bar;
T
150 °C; flange;
max
– 1× VFG 2 DN 15 valve
Code no: 065B2388
– 1× AFPA actuator
Code no: 003G
– 2× Impulse tube set AF
Code no: 003G1391
Products will be delivered separatly.
1021
The controller is a self-acting differential pressure
relief controller primarily for use in district
heating systems. The controller is normally
closed and opens on rising differential pressure.
VFG 2 Valves (metallic sealing cone)
Picture
DN
(mm)
15 4.0
20 6.3 065B2389 065B2402 06 5B2412
25 8.0 0 65B2390 065B2403 06 5B2413
32 16 065B2391 065B2404 065B2414
40 20 065B2392 065B2405 0 65B2 415
50 32 065B2393 065B2406 0 65B2416
65 50 065B2394 065B2407 065 B2417
80 80 065B2395 065B2408 0 65B2418
100 125 065B2396 065B2409 065 B2419
125 160 065B2397 06 5B2410 065B2420
150 280 065B2398
200 320 065B2399 – 065B2422
250 400 065B2400 – 065B2423
k
VS
(m3/h)
Connections
Flanges acc. to
EN 1092-1
T
(°C)
150
The controller has a control valve, an actuator
with one control diaphragm and spring for
differential pressure setting.
Further on two valve versions are available:
– VFG 2 with metallic sealing cone
– VFG 21 with soft sealing cone
Main data:
∙ DN 15 -250
∙ k VS 4.0-400 m3/h
∙ PN 16, 25, 40
∙ Setting range:
– 0.05-0.3 bar / 0.1-0.6 bar / 0.15-1.2 bar /
0.5-2.5 bar / 1-5 bar
∙ Temperature:
– Circulation water / glycolic water up to 30 %:
2 … 150/200 °C
∙ Connections:
– Flange
max
Code No.
PN 16 PN 25 PN 40
065B2388
T
(°C)
200
150
max
1)
Code No.
065B2401 06 5B 2411
– 065B2421
Impulse t ube set AF
© Danfoss | 2018.10
150 280 –
200 320 – – On request
250 400 – – On request
1)
at temperature s above 150 °C only with sea l pots (see Accessories)
200
1)
– On request
VD.CA.N7.02 | 1
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
Ordering (continuous)
Example 2:
Differential pressure relief
controller;
DN 15; kVS 4.0; PN 25; metallic
sealing; setting range 0.15-1.2 bar;
T
200 °C; flange;
max
– 1× VFG 2 DN 15 valve
Code no: 065 B2401
– 1× AFPA actuator
Code no: 003G
– 2× Impulse tube set AF
Code no: 003G1391
– 2× Seal pot V1
Code no: 003G1392
Products will be delivered separatly.
Seal pot s V1
1021
Impulse tube
set AF
VFG 21 Valves (soft sealing cone)
Picture
Note: othe r valves available on special r equest.
DN
(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 0 65B2510
125 160 0 65 B25 11
150 280 065B25 12
200 320 065 B2513
250 400 06 5B2514
k
VS
(m3/h)
T
max
(°C)
150 Flanges acc. to EN 1092-1
AFPA Actuators
Picture ∆p setting range (bar) for DN Code No.
1-5
0.5-2.5 003 G1020
0.15 -1.2
0.1-0.6 003G10 22
0.05-0.3 003 G1023
15-125
15-2 50
Connections
003 G1019
003 G1021
Code No.
PN 16
065B2502
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
Shut off valve
Throttle valve 065B2909
1)
Seal pot has to be us ed on impulse tubes always w hen T
2)
Consist of a nipple , compression ring and nut
1)
1)
– 1 × compression fitting for imp. tube
connection to pipe (G ⁄)
– 2 × socket
Capacit y 1 liter; with compression fittings
for imp. tube Ø10
Capacit y 3 liter; with compression fittings
for imp. tube Ø10, for actuator size 630 cm
For impulse tube Ø10 connections to
2)
controller
For impulse tube Ø10 –
≥ 150 °C
max
2
– 003G1391
– 003G1392
– 003G1403
G ⁄ 003G1468
00 3G1401
2 | © Danfoss | 2018.10
VD.CA.N7.02
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
Ordering (continuous)
Technical data
Service kits
Picture Type designation
Valve insert
Stuffing cone (with EPDM O-rings) 003G1464
DN
(mm)
15 4.0 065B2796 065B2790
20 6.3 065B2797 065B2791
25 8
32 16
40 20
50 32
65 50
80 80
100 125
125 160
150 280 065B2964 065B2966
250 400 065B2965 –
k
VS
(m3/h)
Code No.
for VFG 2 for VFG 21
065B2798 065B2792
065B2799 065B2793
065B2800 0 65B2794
065B2801 065B2795
Valve
Nominal diameter DN 15 20 25 32 40 50 65 80 100 125 150 200 250
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)
Nominal pressure PN 16, 25, 40
Max. differential
pressure
Media Circulation water / glycolic water up to 30 %
Media pH Min. 7, max. 10
Media temperature
Connections Flange
Materials
Valve body
Valve seat Stainless steel, mat. No. 1.4021
Valve cone Stainless steel, mat. No. 1.4404
Sealing
Pressure relieve system Bellows (Stainless steel, mat. No. 1.4571) Diaphragm (EPDM)
1)
at temperature s above 150 °C only with sea l pots (see Accessories)
2)
on request
PN 16
PN 25, 40 20
VFG 2
VFG 21 2 … 150
PN 16 Grey cast iron EN-GJL-250 (GG-25)
PN 25 Ductile iron EN-GJS-400(GGG-40.3)
PN 40 Cast steel GP240GH (GS-C 25)
VFG 2 Metal
VFG 21 EPDM
m3/h
4.0 6.3 8.0 16 20 32 50 80 125 160 280 320 400
VFG 2 ≤ 0.03 ≤ 0.05
VFG 21 ≤ 0.01
bar
°C
16
2 … 150 / 2 … 200
15 12 10
1)
2 … 150 (200 2))
Stainless steel,
mat. No. 1.4313
Stainless steel,
mat . No. 1.4021
VD.CA.N7.02
Actuator
Typ e AFPA
Actuator size cm
Max. operating pressure bar 25 25 16
Diff. pressure setting ranges
and spring colours
Materials
Actuator housing Steel, mat. No. 1.0338, zinc plated
Control diaphragm EPDM (Rolling; fibre enforced)
2
bar
80 250 630
silver yellow silver yellow yellow
1-5 0.5-2.5 0.15 -1.2 0.1-0.6 0.05-0.3
© Danfoss | 2018.10 | 3
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
Application principles
Differential pressure control for a pump in bypass
Installation position DN 15-80 T
The controllers can be installed in any position.
DN 15-80 T
≤ 120 °C
max
≤ 120 °C
max
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
4 | © Danfoss | 2018.10
VD.CA.N7.02
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
Pressure temperature
diagram
Working area is below P-T line
and it ends at T
for each valve
max
PN 16
EN - GJL- 250
(GG -25)
Maximum allowed operating pressure as a function of media temperature (according to EN 1092-2)
PN 25
EN-GJS- 400
(GGG-40.3)
Sizing
Maximum allowed operating pressure as a function of media temperature (according to EN 1092-2)
PN 40
EN-GP-240-GH
(GS- C 25)
Maximum allowed operating pressure as a function of media temperature (according to EN 1092-1)
Given data:
Q
= 4.5 m3/h
max
p
=1.4 b ar
AFPA
Nominal pressure PN 16
kv value is calculated according to formula:
Q
k
max
v
p
AFPA
5,4
4,1
kv = 3.8 m3/h
VD.CA.N7.02
Solution:
The example selects AFPA VFG 2 PN 16 DN 15,
kVS value 4.0 with differential pressure setting
range 0.5-2.5 bar.
© Danfoss | 2018.10 | 5
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
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
differential pressure control
11 . Setting spring for diff.
pressure control
12. Adjuster for diff. 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. Valve body extension
19. Shut off valve for water filling
20. Closing plug
5
8
15
17
AFPA / VFG 2 DN 15 – 125
3
6
4
7
2
VFG 2 DN 150-250, T
max
150 °C
VFG 2 DN 150-250, T
max
18
9
2
200 °C
Function
The pressures in front and behind of the control
valve are being transferred through the impulse
tubes to the actuator chambers and act on
control diaphragm for diff. pressure control.
The controller became normally closed after
commissioning (stretching the spring). It opens
on rising differential pressure and closes on
falling differential pressure to maintain constant
differential pressure.
Settings Differential pressure setting
Differential pressure setting is being done by the
adjustment of the setting spring for differential
pressure control. The adjustment can be done by
means of spring for differential pressure setting
and pressure indicators.
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VD.CA.N7.02
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
Dimensions
L
L
H
B
H
B
VFG DN 15-125 VFG DN 150-250
L
1
H
1
B
VFG DN 150-250
with valve body extension up to 200 °C
VFG 2, VFG 21 Valves
DN 15 20 25 32 40 50 65 80 100 125 150 200 250
L
B 213 213 239 239 241 241 276 276 381 3 81 326 354 401
H 267 267 304 304 323 323 370 370 505 505 505 591 661
Weight
B
1
H
1
Weight (valve
with body
extension)
PN 16 / 25
PN 40 30 32.5 60.5 69 141 253 333
PN 16 / 25
PN 40 179 336 505
130 150 160 180 200 230 290 310 350 400 480 600 730
mm
kg 7.5 8.5 10 12 15 18
mm
kg
27. 5 30 58 68 115 185 323
620 852 11 99
799
154 301 469
1089
1459
VD.CA.N7.02
A
H
AFPA Actuator
Actuator size cm280 250 630
A mm 172 263 380
H mm 430 470 520
Weight kg 7. 5 13 28
Seal pot V1
Seal pot V2
ø60
110
SW 22
78
Ø10
40
SW19
Shut off valve Compression fitting
© Danfoss | 2018.10 | 7
G⁄
Data sheet Differential pressure relief controller AFPA/VFG 2(1) (PN 16, 25, 40)
8 | © Danfoss | DHS-SRMT/SI | 2018.10
VD.CA.N7.02