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AVPQT Differential Pressure, Flow & Temperature Controller
Brand: Danfoss
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 according to EN 14597.
Controllers combined with STM thermostats protect systems against exceeding temperatures.
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
- Dezincing Free Brass CuZn36Pb2As - Valve Cone
Diaphragm Material
- EPDM
Differential Pressure
- psi: 232.1 to 290.1 (kPa: 1,600 to 2,000, bar: 16 to 20) - Max.
Enclosure Finish
- Yellow - Spring Colour
Enclosure, Body Material
- 304L Stainless Steel - Upper Casing of Diaphragm for Actuator Housing
- Dezincing Free Brass - Lower Casing of Diaphragm for Actuator Housing
- Ductile Iron EN-GJS-400-18-LT (GGG-40.3) - Flange Valve Body
- Red Bronze CuSn5ZnPb (Rg5) - Thread Valve Body
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 - 1” (DN 25)
- 1” (DN 25) - PN 25
Flange Size - 1/2” (DN 15)
- 1/2” (DN 15) - PN 25
Flange Size - 2” (DN 50)
- 2” (DN 50) - PN 25
Flange Size - 3/4” (DN 20)
- 3/4” (DN 20) - PN 25
Flow Rate
- 0.07 to 25 Kvs (m³/hour)
Materials of Construction
- Copper Tube Ø 6 x 1 mm - Impulse Tube
- Piston - Pressure Relieve System
Measuring Range
- pH: 7 to 10
Media
- Circulation Water
- Glycolic Water up to 30 %
Nominal Pressure
- psi: 362.6 (bar: 25, kPa: 2,500)
Process Temperature
- 2° to 150° C (35.6° to 302° F)
Seat / Seal Material
- Seal: EPDM
- Seat: 316Ti Stainless Steel - Valve Seat
Setting Range
- psi: 2.90 to 14.5 (kPa: 20 to 100, bar: 0.2 to 1)
- 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
