Danfoss STM/VG, STM/AVT Data sheet

Data sheet

TR(TW)700

Temperature controller AVT with safety temperature monitor
STM/VG(F) (PN25)

Description

STW871

STM / VGF

STM/VG(F) and STM/AVT/VG(F) are self-acting
proportional temperature controllers used
for temperature control and temperature
monitoring of drinking water, water and water
glycol mixtures for heating and district heating
systems.

VG - valve with external thread
VGF - valve with flange

Controller closes on rising temperature.

The controllers are:

• Type-tested acc. to EN 14597 and protect
against exceeding temperatures:
Applications:

- District heating systems acc. to DIN 4747

- Heating systems acc. to EN 12828 (DIN 4751)

and EN 12953-6 (DIN 4752)

- Water heating systems for drinking and

industrial waters acc. to DIN 4753

Main data:

• DN 15-50

• kVS 0.4 -25 m3/h

• PN 25

• Setting ranges:

- STM monitor:

20 … 75 °C / 40 … 95 °C / 30 … 110 °C

- AVT thermostatic actuator:

− 10 … 4 0 °C / 20 … 70 °C /
40 … 90 °C / 60 … 110 °C

and

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

• Temperature:

- Circ. water/glycolic water up to 30 %:
2 … 150 °C

• Connections:

- Ext. thread (weld-on, thread and flange
tailpieces)

- Flange

• Flow and return mounting

Ordering

Example 1 - STM / VG(F) controller:
Safety temperature monitor;
DN 15; kVS 1.6 , PN 25;
limit range 30 …110 °C;
T

150 °C; ext. thread

max

- 1× VG DN 15 valve
Code No: 065B0772

- 1× STM monitor, 30 … 110 °C
Code No: 065-0608

Option:

- 1× Weld-on tailpieces
Code No: 003H6908

All products will be delivered
separately.

© Danfoss | 2020.07

VG, VGF valve

Picture

DN k

(mm) (m3/h)

15

20 6.3 G 1 A 065B0775
25 8.0 G 1 ¼ A 065B0776
32 12.5 G 1 ¾ A 065B0777
40 16 G 2 A 065B0778
50 20 G 2 ½ 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 065B07 74

Cylindrical external thread acc. to

Connection Code No.

G ¾ A

ISO 228/1

Flanges PN 25, acc. to EN 1092-2

AI173286479061en-000602 | 1

065B0770

065B0780

Data sheet Temperature controller AVT with safety temperature monitor STM/VG(F) (PN 25)

Ordering (continuous)

Example 2- STM/AVT/ VG(F)
controller:
Temperature controller with safety
temperature monitor; DN 15, kVS 1.6 ;
PN 25; limit range 30 … 110 °C;
setting range 40 … 90 °C;
T

150 °C; ext. thread

max

- 1× VG DN 15 valve
Code No: 065B0772

- 1× STM monitor, 30 … 110 °C
Code No: 065-0608

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

Code No: 065-0598

- 1× K2 Combination piece

Code No: 003H6855

Option:

- 1× Weld-on tailpieces

Code No: 003H6908

All products will be delivered
separately.

STM Safety temperature monitor (actuator)

Picture For valves

DN 15-50

1)

conic male t hread EN 10226 -1

Limit range

(°C)

30 … 11 0

20 … 75 065-0609
40 … 95 065-0610

AVT Thermostatic actuator

Picture For valves

DN 15-2 5

DN 32-50

DN 15-50

1)

conic male t hread EN 10226 -1

2)

without imme rsion pocket

Setting range

(°C)

–10 … +40

20 … 70 065-0597
40 … 90 065-0598

60 … 110 065-0599

−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 … 12 5 065-0607

Temperature sensor with brass immersion

pocket, length, connection

210 mm, R ¾

Temperature sensor with brass immersion

pocket, length, connection

170 mm, R ½

210 mm, R ¾

255 mm, R ¾

1)

1)

1)

1) 2)

Code No.

065-0608

Code No.

065-0596

065-0600

065-0604

Accessories for valves

Picture Type designation DN Connection Code No.

15
20 003H6909

Weld-on tailpieces

External thread tailpieces

Flange tailpieces

25 003H 6910
32 003 H69 11
40 065B2006
50 065B2007
15
20 R ¾ 003H6903
25 R 1 003H6904

Conical ex t. thread acc. to

32 R 1¼ 003H6905
40 R 1½ 065B2004
50 R 2 065B2005
15
20 003H 6916
25 003 H6917

EN 10226-1

Flanges PN 25, acc. to EN 1092-2

-

R ½ 003H69 02

Accessories for thermostats

Picture Type designation PN For controllers Material Code No.

AVT/VG(F) DN 15-25

Immersion pocket 25

Combination piece K2 003H6855
Combination piece K3 003H6856

1)

Not for AVT t hermostatic actuator code n umbers: 065-0604, 065-0605, 065-0606, 065-0607

AVT/VG(F) DN 32-50

STM/VG(F) DN 15-50

Stainless steel, mat. No. 1.4571 065 -4415

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

Brass 06 5-4 414

Brass 065 -4416

003H6908

003H6 915

1)

1)

1)

1)

2 | AI173286479061en-000602

© Danfoss | 2020.07

Data sheet Temperature controller AVT with safety temperature monitor STM/VG(F) (PN 25)

Ordering (continuous)

Technical data

Service kits

Picture Type designation

Valve insert

Housing of sensor stuffing box

DN k

(mm) (m3/h)

15

20 6.3 0 03H6 874
25 8.0 003H6875

32 / 40 / 50 12.5 / 16 / 20 / 25 003H6876

for sensors

AVT 170 R ½ 065- 4420

AVT 210, 255 R ¾ 065 -4421

VS

Code No.

0.4 003H6869

1.0 0 03H6870

1.6 003H6871

2.5 003H6872

4.0 003H6873

VG, VGF valves

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

VS

Nominal pressure PN 25
Max. differential 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

thread Red bronze CuSn5ZnPb (Rg5)

flange - Ductile iron EN-GJS- 400-18-LT (GGG 40.3)
Valve seat Stainless steel, mat. No. 1.4571
Valve cone Dezincing free brass CuZn36Pb2As
Sealing EPDM
Pressure relieve system Piston

1)

Flange valve b ody

≤ 0.02 ≤ 0.05

External thread

- Flange
Weld-on and external thread

Flange -

Ductile iron

EN-GJS-400-18-LT

(GGG 40.3)

1)

© Danfoss | 2020.07

STM Safety temperature monitor (actuator)

Limit range X

s

Time constant T acc. to EN 14597 s max. 100
Gain K

s

Max. adm. temperature at sensor 80 °C above maximum setpoint
Max. amb. temperature at thermostat °C 0 … 70
Nominal pressure sensor
Nominal pressure immersion pocket
Capillary tube length m 5

Materials

Temperature sensor Cooper

Immersion pocket

Ms design Brass, nickel-plated

Stainless steel design mat. No. 1.4435
Handle for temp. setting Polyamide, glass fiber-reinforced
Scale carrier Polyamide

°C

20 … 75 / 40 … 95 / 30 … 110

mm/°K

PN 25

0.3

AI173286479061en-000602 | 3

Data sheet Temperature controller AVT with safety temperature monitor STM/VG(F) (PN 25)

Technical data (continuous)

Application principles

AVT Thermostatic actuator

Setting range X

Time constant T acc. to EN 14597 s max. 50 (170 mm, 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 m 5 (170 mm, 210 mm), 4 m (255 mm)

Materials

Temperature sensor Cooper

Immersion pocket

Handle for temp. setting Polyamide, glass fiber-reinforced
Scale carrier Polyamide

1)

for sensor 170 and 210 mm

s

s

Ms design Brass, nickel-plated

1)

Stainless steel design Mat. No. 1.4571 (170 mm), mat. No. 1.4435 (210 mm)

°C

mm/°K

PN 25

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

0.2 (170 mm); 0.3 (210 mm); 0.7 (255 mm)

Combinations

AVT / VG

- temperature controller

STM / AVT / VG

- temperature controller with
safety temperature monitor

STM / VG

- safety temperature monitor

STM / AVT / AVT /VG

- two temperature controllers with

safety temperature monitor

4 | AI173286479061en-000602

© Danfoss | 2020.07