Danfoss AVPQT Data sheet

Data sheet

Differential pressure, flow and temperature controller (PN 25)
AVPQT - return mounting, adjustable setting

Description

The AVPQT is a self-acting differential pressure,
flow and temperature controller primarily for use
in district heating systems. The controller closes
on rising differential pressure or temperature, or
when set max. flow is exceeded.

AVPQT controller can be combined with AVT or
STM thermostatic actuators.
The AVPQT controller have a control valve with
adjustable flow restrictor, combination piece
with connection neck for thermostat, an actuator
with two control diaphragms and handle for
differential pressure setting.

The controllers combined with AVT and STM
thermostats are type-tested acc. to EN 14597.

Controllers combined with STM thermostats
protect systems 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 4.0-25 m3/h

• Flow range: 0.07-15 m3/h

• PN 25

• Setting range: 0.2-1.0 bar

• Flow restrictor ∆pb: 0.2 bar

• Setting ranges:

- AVT:

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

and
10 … 45 °C / 35 … 70 °C / 60 …

- STM:
20

…

75 °C / 40

• Temperature:

- Circulation water / glycolic water up to 30 %:

2 … 150 °C

• Connections:

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

tailpieces)

- Flange

…

95 °C / 30

100 °C / 85

…

110 °C

…

125 °C

© Danfoss | 2017.01

VD.DC.M5.02 | 1

Data sheet AVPQT (PN 25)

Ordering

Example:
AVT (or STM) / AVPQT controller:
Differential pressure; flow and
temperature controller; return
mounting; DN 15; kVS 4.0; PN 25;
setting range 0.2-1.0 bar;
T

150 °C; ext. thread;

max

- 1× AVPQT DN 15 controller
Code No: 003H6807

- 1× AVT thermostatic actuator,
40 … 90 °C
Code No: 065-0598

- 1× Impulse tube set AV R ⁄
Code No: 003H6852

Option:

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

The controller AVPQT will be
delivered completely assembled,
inclusive combination piece and
impulse tubes between valve and
actuator. Thermostatic actuator
AVT will be delivered separately.
External impulse tube (AV) must be
ordered separately.
In case of safety temp. monitoring
STM should be ordered instead of
AV T.

AVPQT Controller (return mounting)

Picture

DN k

(mm) (m3/h)

15 4.0

20 6.3 G 1 A 003H6808

25 8.0 G 1¼ A 003H6809

32 12. 5

40 20 00 3H 6811

50 25 00 3H6812

VS

AVT Thermostatic actuator

Picture For valves

DN 15-2 5

DN 32-50

DN 15- 50

1)

conic male thre ad EN 10226-1

2)

without immersion pocket

Connection

Cylindr, ext, thread acc, to ISO

Setting range

–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

228/1

Flanges PN 25, acc, to EN 1092-2 0. 2-1.0

Temperature sensor with brass immersion

(°C)

pocket, length, connection

255 mm, R ¾

Δp setting range

G ¾ A

170 mm, R ½

210 mm, R ¾

1)

1)

1) 2)

(bar)

0. 2-1.0

Code No,

003H68 07

003 H6810

Code No.

065-0596

065-0600

065-0604

2 | VD.DC.M5.02

STM Safety temperature monitor (actuator)

Picture For valves

1)

conic male thre ad EN 10226-1

DN 15- 50

Limit range

(°C)

30 … 11 0

20 … 75 065-0609

40 … 95 065-0610

Temperature sensor with brass immersion

pocket, length, connection

210 mm, R ¾

1)

© Danfoss | 2017.01

Code No.

065-0608

Data sheet AVPQT (PN 25)

Ordering (continuous)

Accessories for AVPQT

Picture Type designation DN Connection Code No.

15

Weld-on tailpieces

20 003H6909

-

25 00 3H6910

External thread tailpieces

15

20 R ¾ 003H6903

25 R 1 003H6904

Conical ex t. thread acc. to

EN 10226-1

R ½ 003H6902

15

Flange tailpieces

20 003H6916

Flanges PN 25, acc. to EN 1092-2

25 0 03H6 917

Description:

Impulse tube set AV

- 1× copper tube Ø6 × 1 × 1500 mm

- 1× compression t ting 1) for imp. tube
connection to pipe Ø6 × 1 mm

1)

10 compression fittings for imp. tube connection to pipe, Ø6 × 1 mm R ⁄ 003H6857

1)

10 compression fittings for imp. tube connection to pipe, Ø6 × 1 mm R ⁄ 003H6858

1)

10 compression fittings for imp. tube connection to pipe, Ø6 × 1 mm R ½ 003H6859

1)

10 compression fittings for imp. tube connection to actuator, Ø6 × 1 mm G ⁄ 003 H6931

R ⁄ 003H6852

R ⁄ 003H 6853

R ½ 003H6854

Shut off valve Ø6 mm 003H0276

1)

Compression fitting consists of a nipple, compression ring and nut.

Accessories for thermostats

Picture Type designation For controllers Material Code No.

Brass 06 5-4 414

Brass 065 -4416

Immersion pocket
PN 25

AVT / AVPQT DN 15-25

AVT / AVPQT DN 32-50
STM / AVPQT DN 15-50

Stainless steel, mat. No. 1.4571

Stainless steel, mat. No. 1.4435

Combination piece K2 003H6855

Combination piece K3 003H6856

1)

Not for AVT the rmostatic actuator code nu mbers: 065-0604, 065-0605, 065-0606, 065-0607

003H6908

003H6 915

065- 4415

06 5-4 417

1)

1)

1)

1)

Service kits

Picture Type designation DN

Valve insert

Type designation

Actuator with adjustable handle 0. 2-1.0 003H6842

Housing of sensor stuffing box

k

VS

(m3/h)

15

2.5 003H6864

4.0 003H6865

Code No.

20 6.3 003H6866

25 8.0 003H6867

32 / 40 / 50 12.5 / 20 / 25 003H6868

∆p setting range

(bar)

Code No.

for sensors

AVT R ½ 065-4420

AVT R ¾ 065-4421

© Danfoss | 2017.01

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Data sheet AVPQT (PN 25)

Technical data

Valve

Nominal diameter DN 15 20 25 32 40 50

kVS value

from

Range of max.
flow setting

∆pb 1) = 0.2 bar

m3/h

to

3)

to

Cavitation factor z ≥ 0.6 ≥ 0.55 ≥ 0.5

Leakage acc. to standard IEC 534 % of k

Nominal pressure PN 25

Min. differential pressure

Max. differential pressure 20 16

bar

Medium Circulation water / glycolic water up to 30 %

Medium pH Min. 7, max. 10

Medium temperature °C 2 … 150

Connections

valve External thread Flange

tailpieces Weld-on, external thread and flange -

Materials

thread Red bronze CuSn5ZnPb (Rg5) -

Valve body

flange -

Valve seat Stainless steel, mat. No. 1.4571

Valve cone Dezincing free brass CuZn36Pb2As

Sealing EPDM

Pressure relieve system

1)

∆pb - differe ntial pressure over flow rest rictor

2)

Depends o n the flow rate and valve kVS ; For Q

3)

Higher ma x flow are achieved at highe r differential pressu res over AVPQT controller. In general at p > 1-1 .5 ba r

4.0 6.3 8.0 12. 5 20 25

0.07 0.16 0.2 0.4 0.8 0.8

2.2 3.0 3.5 8.0 10 12

2.4 3.5 4.5 10 12 15

VS

≤ 0.02 ≤ 0.05

see remark

2)

Ductile iron

EN-GJS-400-18-LT (GGG 40.3)

Piston

= Q

-> ∆p

set

max

≥ 0.5 bar; For Q

min

< Q

->

set

p

max

min

2





Q











k

VS





p



b

Actuator

Typ e AVPQ T

Actuator size cm

Nominal pressure PN 25

Flow restrictor diff. pressure, ∆p

b

Di. pressure setting ranges and
spring colours

Materials

Actuator housing

Upper casing of diaphragm

Lower casing of diaphragm

Diaphragm EPDM

Impulse tube Copper tube Ø6 × 1 mm

bar

2

54

0.2

0. 2-1.0

yellow

Stainless steel, mat. No.1.4301

Dezincing free brass CuZn36Pb2As

AVT Thermostatic actuator

Setting range X

s

°C

Time constant T acc. to EN 14597 s max. 50 (170 mm, 210 mm), max. 30 (255 mm)

Gain K

s

mm/°K 0.2 (170 mm), 0.3 (210 mm), 0.7 (255 mm)

Max. adm. temperature at sensor 50 °C above maximum setpoint

Max. amb. temperature at thermostat °C 0 … 70

Nominal pressure sensor

Nominal pressure immerison pocket

PN 25

Capillary tube length 5 m (170 mm, 210 mm), 4 m (255 mm)

Materials

Temperature sensor Cooper

Ms design Brass, nickel-plated

Immersion pocket

1)

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

Handle for temp. setting Polyamide, glass fiber-reinforced

Scale carrier Polyamide

1)

for sensor 170 and 210 mm

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

4 | VD.DC.M5.02

© Danfoss | 2017.01

Data sheet AVPQT (PN 25)

Technical data (continuous)

Application principles

The controller must be installed
in the return pipe only.

STM Safety temperature monitor (actuator)

Limit range X

Time constant T acc. to EN 14597 s ma x. 100

Gain K

Max. adm. temperature at sensor 80 °C above ma ximum setpoint

Max. amb. temperature at thermostat °C 0 … 70

Nominal pressure sensor

Nominal pressure immerison pocket

Capillary tube length m 5

Materials

Temperature sensor Cooper

Immersion pocket

Handle for temp. setting Polyamide, glass fiber-reinforced

Scale carrier Polyamide

s

s

Ms design Brass, nickel-plated

Stainless steel design mat. No. 1.4435

°C 20 … 75 / 40 … 95 / 30 … 110

mm/°K 0.3

PN 25

Combinations

AVT / AVPQT

- Differential pressure, flow and temperature controller

STM / AVPQT

- Differential pressure and flow controller with
safety temperature monitor

© Danfoss | 2017.01

VD.DC.M5.02 | 5