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AVQT Flow & Temperature Controller
Brand: Danfoss
AVQT is a self-acting flow and temperature controller primarily for use in district heating systems. The controller closes on rising temperature or when set max. flow is reached.
AVQT controller can be combined with AVT or STM thermostatic actuators.
The controllers AVQT have a control valve with adjustable flow restrictor, connection neck for thermostat, connection neck for electrical actuator (AVQMT only), and a pressure actuator with one control diaphragm.
Specifications
Brand
Actuator Size
- 8.37 in² (54 cm²)
Applications
- District Heating Systems According to DIN 4747
- Heating Systems According to EN 12828 (DIN 4751) & EN 12953-6 (DIN 4752)
- Water Heating Systems for Drinking & Industrial Waters According to DIN 4753
BSP Connection
- G 1” A
- G 1-1/4” A
- G 3/4” A
Cone Material
- Valve Cone: Dezincing Free Brass CuZn36Pb2As
Diaphragm Material
- EPDM
Differential Pressure
- psi: 2.90 (kPa: 20, bar: 0.2) - for Flow Restrictor
- psi: 290.1 (kPa: 2,000, bar: 20) - Max.
Enclosure, Body Material
- 304 Stainless Steel - Upper Housing of Actuator
- Dezincing Free Brass CuZn36Pb2As - Lower Housing of Actuator
- Ductile Iron EN-GJS-400-18-LT (GGG-40.3) - Valve Body
- Red Bronze CuSn5ZnPb (Rg5) - Valve Body (Thread)
Flange Size - 1-1/2” (DN 40)
- 1-1/2” (DN 40) - PN 25
Flange Size - 1-1/4” (DN 32)
- 1-1/4” (DN 32) - PN 25
Flange Size - 2” (DN 50)
- 2” (DN 50) - PN 25
Flow Rate
- 0.02 to 8.83 scfm (0.03 to 15 m³/hour) - Flow Range
- 0.94 to 14.71 scfm (1.6 to 25 m³/hour)
Materials of Construction
- Copper Tube, Ø 6 x 1 mm - Impulse Tube
Measuring Range
- Medium pH: 7 to 10
Media
- Circulation Water
- Glycolic Water up to 30 %
Mounting Position
- Any Position up to 100° C (212° F) Medium Temperature
- Horizontal for 130° C (266° F) & 150° C (302° F) Medium Temperature
Nominal Pressure
- psi: 362.6 (kPa: 2,500, bar: 25)
Process Temperature
- 2° to 150° C (35.6° to 302° F)
Seat / Seal Material
- Seal: EPDM
- Valve Seat: Stainless Steel 1.4571
- 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
