Danfoss VG, VGF Data sheet

Data sheet

2 - way valve (NO), pressure relieved (PN 25)

VG - external thread
VGF - ange

Description

VG

VGF

VG and VGF are pressure relieved 2-way normally
open (NO) valves, designed to be combined with:

- AVT thermostatic actuators

- STM safety temperature monitors

- STL safety temperature limiters

In combination with AVT thermostatic actuators,
valves can be used primarily:

• for domestic hot water (DHW) production

- Hot water tanks

- Storage charge systems

- Instantaneous domestic hot water
production

• and in mixing loops and room heating
systems as well.

Main data:

• DN 15-50

• kVS 0,4-25 m3/h

• PN 25

• Temperature:

- Circ. water / glycolic water up to 30 %:

2 ... 150 °C

• Connections:

- Ext. thread (weld-on, thread and ange

tailpieces)

- Flange

• Flow and return mounting

Ordering

Example:
Valve DN 15; kVS 1,6; PN 25;
T

150 °C; ext. thread

max

- 1× VG DN 15 valve
Code No: 065B0772

Option:

- 1× Weld-on tailpieces
Code No: 003H69 0 8

DEN-SMT/SI

VG, VGF valve

Picture

VD.HD.U4.02 © Danfoss 09/2015

DN k

(mm) (m3/h)

15

20 6,3 G 1 A 065 B0775

25 8,0 G 1¼ A 065B0776

32 12, 5 G 1¾ A 065B0777

40 16 G 2 A 065B0778

50 20 G 2½ A 065B0779

15 4,0

20 6,3 065B0781

25 8,0 065B0782

32 12, 5 065B0783

40 20 065B0784

50 25 065B0785

VS

0,4

1,0 065B0771

1,6 065B0772

2,5 065B0773

4,0 06 5B07 74

Cylindrical external thread acc. to

Connection Code No.

065B0770

G ¾ A

ISO 228/1

065B0780

Flanges PN 25, acc. to EN 1092-2

1

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

Ordering (continuous)

Accessories

Picture Type designation DN Connection Code No.

15

20 003H6909

Weld-on tailpieces

25 00 3H6910

32 0 03 H69 11

-

40 065B2006

50 065B2007

15

R ½ 003H6902

20 R ¾ 003H6903

25 R 1 003H6904

External thread tailpieces

Conical ex t. thread acc. to EN

32 R 1¼ 003H6905

10226 -1

40 R 1½ 065B2004

50 R 2 065B2005

15

Flange tailpieces

20 003H 6916

Flanges PN 25, acc. to EN 1092-2

25 0 03H6 917

Service kits

Picture Type designation DN (mm) kVS (m3/h) Code N o.

0,4 003H6869

1,0 003H6 870

15

Valve insert

20 6,3 00 3H6874

25 8,0 003H 6875

32 / 40 / 50 12 5 / 16 / 20 / 25 003H68 76

1,6 003H 6871

2,5 003H6872

4,0 003H6873

003H6908

003H6915

Technical data

Nominal diameter DN 15 20 25 32 40 50

k

value m3/h 0,4 1, 0 1,6 2,5 4,0 6,3 8 12, 5 16/2 0 1)20/25

VS

Stroke 3 5 10

Control ratio > 1:50

Control characteristic linear

Cavitation factor z ≥ 0,6 ≥ 0,55 ≥ 0,5

Leakage acc. to standard IEC 534 % of k

Nominal pressure PN 25

Max. dierential pressure bar 20 16

Medium Circulation water / glycolic water up to 30 %

Medium pH Min. 7, max. 10

Medium temperature °C 2 … 150

valve

Connections

tailpieces

Materials

Valve body

Valve seat Stainless steel, mat. No. 1.4571

Valve cone Dezincing free brass CuZn36Pb2As

Sealing EPDM

Pressure relieve system Piston

1)

Flange valve bod y

thread Red bronze CuSn5ZnPb (Rg5)

ange - Ductile iron EN- GJS-400 -18-LT (GGG 40,3)

VS

≤ 0,02 ≤ 0,05

External thread

- Flange

Weld-on and external thread

Flange -

Ductile iron

EN-GJS-4 00-18-LT (GGG

40, 3)

1)

2

VD.HD.U4.02 © Danfoss 09/2015

DEN-SMT/SI

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

Application principles

Pressure temperature
diagram

Valves can be installed in any position.Installation positions

Note!

Installation positions for AVT thermostatic actuators, STM
safety temperature monitors and STL safety temperature
limiters have to be obser ved as well. Please see relevant
Data Sheet.

EN-GJS-400 -18-LT (GGG 40,3) PN 25
CuSn5ZnPb (Rg5) PN 25

DEN-SMT/SI

working area

Maximum allowed operating pressure as a function of medium temperature (according to EN 1092-2 and EN 1092-3).

VD.HD.U4.02 © Danfoss 09/2015

3

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

86,014

Sizing

Given data:
P

= 14 kW

max

∆t = 20 K
∆pv = 0,15 bar

P

- heating power (kW)

max

∆t -temperature dierence (K)
∆pv - dierential pressure across the valve

Maximum ow Q
calculated according to formula:



max

= 0,6 m3/h

max

max

Q

Q

(m3/h) through the valve is

max

8 6 , 0P



t







20

kv value is calculated according to formula:

Q

max

k



v

p



6,0



1 5, 0

V

kv = 1,5 m3/h

Chosen kVS = 1,6 m3/h

or read from the sizing diagram by taking a line
through Q scale (0,6 m3/h) and ∆pv scale (0,15 bar)
to intersect kv-scale at 1,5 m3/h

Chosen kvs = 1,6 m3/h

Solution:
The example selects

1) ext. thread valve VG DN 15, kVS value 1,6 or

2) ange valve VGF DN 15, kVS value 1,6

4

VD.HD.U4.02 © Danfoss 09/2015

DEN-SMT/SI

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

Design

1. Valve body

2. Valve insert

3. Pressure relieved valve cone

4. Valve stem

VG VGF

Dimensions

L

L

1

H

2

H

1

H

2

H

H

VG DN 15-25 VGF DN 15-25 VGF DN 32-50VG DN 32-50

VG

L H H1 H2

DN

15 65 80 34 46 0,7

20 70 80 34 46 0,8

25 75 83 37 46 0,9

32 100 151 63 88 3,0

40 110 151 63 88 3,1

50 130 151 63 88 3,8

mm

L

3

H

Weight

(kg)

L

2

L

1

1

H

2

H

H

H

2

H

VGF

L H H1 H2

DN

15 13 0 144 48 96 3,3

20 150 149 53 96 4,1

25 160 15 4 58 96 4,7

32 180 158 70 88 7, 5

40 200 163 75 88 9,0

50 230 171 83 88 11,1

Note: other ange dimensions - see table for tailpieces

mm

L

1

L

Weight

(kg)

d

2

H

DEN-SMT/SI

d

DN R

15 ⁄ 32 (G ⁄A) 21 13 0 131 139 65 14 4

20 ⁄ 41 ( G 1A) 26 150 14 4 154 75 14 4

25 1 50 (G 1⁄A) 33 160 16 0 159 85 14 4

32 1⁄ 63 (G 1¾A) 42 - 177 18 4 10 0 18 4

40 1 ⁄ 70 (G 2A) 47 - 195 204 110 18 4

50 2 82 (G 2½A) 60 - 252 234 125 18 4

1)

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

2)

Flanges PN 25, acc. to EN 1092-2

VD.HD.U4.02 © Danfoss 09/2015

R

1)

SW d L

k

2)

L

L

1

2

mm

k d

3

2

n

5

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

6

VD.HD.U4.02 © Danfoss 09/2015

DEN-SMT/SI

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

DEN-SMT/SI

VD.HD.U4.02 © Danfoss 09/2015

7

Data sheet 2- way valve VG, VGF, pressure relieved (PN 25)

8

VD.HD.U4.02

Produce d by Danfoss A/S © 09/2015