Danfoss AVQT flow and temperature controller, PN 25, DN 15, flow range 0.03–0.9 m³/h, Kvs 1.6 m³/h, External thread G 3/4 A (ISO 228/1), via tailpieces

Danfoss AVQT (003H6759) — self-acting flow and temperature controller, PN 25, DN 15, for district heating and cooling systems. The AVQT holds the flow constant and limits it to the set maximum and closes on rising temperature. It accepts an AVT thermostatic actuator, or an STM safety temperature monitor where over-temperature protection is required. It comprises a control valve with adjustable flow restrictor, a connection neck for the thermostatic actuator, and a pressure actuator with one control diaphragm. Flow range 0.03 - 0.9 m³/h; flow-restrictor differential pressure 0.2 bar; Kvs 1.6 m³/h. Maximum differential-pressure range 20 bar; media temperature 2–150 °C; cavitation factor z ≥ 0.6; seat leakage 0.02 % Kvs (IEC 60534). Temperature is set by the separately ordered AVT thermostatic actuator, setting ranges 10–40 / 20–70 / 40–90 / 60–110 °C and 10–45 / 35–70 / 60–100 / 85–125 °C (AVT actuator, ordered separately); the controller is delivered assembled with the impulse tube between valve and actuator, the actuator ordered separately. Combined with AMV(E), AVT or STM actuators the controller is type-tested to EN 14597. Valve body Red bronze CuSn5ZnPb (Rg5); valve cone Dezincing free brass CuZn36Pb2As; seat Stainless steel, mat. 1.4571; control diaphragm EPDM. Connection External thread G 3/4 A (ISO 228/1), via tailpieces. Mounting version Free. Permissible media: District heating/cooling circulation water (Glycolic water up to 30%), pH 7–10. OEM P/N 003H6759. Technical data quoted verbatim from store.danfoss.com (code 003H6759) and the Danfoss AVQT / AVQMT (PN 25) data sheet. 1.4571; control diaphragm EPDM; Pressure rating: PN 25 (max. differential-pressure range 20 bar); Temperature range: 2 to 150 °C (district heating/cooling water); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants. No.

Code number

003H6759

Type

AVQT

Product group

Pressure and flow controllers

Function

Self-acting flow and temperature controller (limits max. flow; closes on rising temperature; accepts AVT/STM thermostatic actuator)

Valve size

DN 15

Pressure class

PN 25

Connection

External thread G 3/4 A (ISO 228/1), via tailpieces

Kvs value

1.6 m³/h

Flow rate range

0.03 - 0.9 m³/h

Flow restrictor differential pressure (Δpb)

0.2 bar

Max. differential pressure range

20 bar

Media temperature

2 - 150 °C

Temperature setting ranges (AVT actuator, ordered separately)

10–40 / 20–70 / 40–90 / 60–110 °C and 10–45 / 35–70 / 60–100 / 85–125 °C (AVT actuator, ordered separately)

Media pH

7 - 10

Cavitation factor z

≥ 0.6

Seat leakage rate

0.02 % Kvs (IEC 60534)

Mounting version

Free

Stem position

Normally open

Stroke

5 mm

Type test

EN 14597 (controller combined with AMV(E) / AVT / STM actuator)

Permissible media

District heating/cooling circulation water (Glycolic water up to 30%)

Valve body material

Red bronze CuSn5ZnPb (Rg5)

Valve cone material

Dezincing free brass CuZn36Pb2As

Valve seat material

Stainless steel, mat. No. 1.4571

Actuator diaphragm

EPDM

EU RoHS compliance

Yes with exemptions (6(c))

REACH Candidate List substance

Lead (CAS no. 7439-92-1)

China RoHS

Out of scope

Net weight

3.048 kg

Gross weight

3.048 kg

EAN

5702421542804

Material

Valve body Red bronze CuSn5ZnPb (Rg5); valve cone Dezincing free brass CuZn36Pb2As; valve seat Stainless steel, mat. No. 1.4571; control diaphragm EPDM

Pressure Rating

PN 25 (max. differential-pressure range 20 bar)

Temperature Range

2 to 150 °C (district heating/cooling water)

HS Code

8481.80