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AVPQ 4 Differential Pressure & Flow Controller
Brand: Danfoss
AVPQ 4 is a self-acting differential pressure and flow controller primarily for use in district heating systems. The controller closes on rising differential pressure or when set max. flow is exceeded.
The controller has a control valve with adjustable flow restrictor, an actuator with two control diaphragms and handle for differential pressure setting.
Specifications
Brand
Actuator Size
- 8.37 in² (54 cm²)
BSP Connection
- G 1” A
- G 1-1/4” A
- G 1-3/4” A
- G 2” A
- G 2-1/2” A
- G 3/4” A
Cone Material
- Dezincing Free Brass CuZn36Pb2As
Diaphragm Material
- EPDM
Differential Pressure
- psi: 232.1 (kPa: 1,600, bar: 16) - Max.
- psi: 290.1 (kPa: 2,000, bar: 20) - Max.
Enclosure, Body Material
- Lower Casing of Actuator: Dezincing Free Brass CuZn36Pb2As
- Upper Casing of Actuator: 304L Stainless Steel
- Valve (Thread & Flange): Ductile Iron EN-GJS-400-18-LT (GGG-40.3)
- Valve (Thread): Red Bronze CuSn5ZnPb (Rg5)
Flange Size - 1-1/2” (DN 40)
- 1-1/2” (DN 40) - PN 25 According to EN 1092-2
Flange Size - 1-1/4” (DN 32)
- 1-1/4” (DN 32) - PN 25 According to EN 1092-2
Flange Size - 2” (DN 50)
- 2” (DN 50) - PN 25 According to EN 1092-2
Flow Rate
- 0.01 to 14.71 scfm (0.015 to 25 m³/hour)
Materials of Construction
- Impulse Tube: Copper
Media
- Circulation, Glycolic Water Up to 30 %, pH: 7 to 10
Nominal Pressure
- psi: 362.6 (bar: 25, kPa: 2,500)
Process Temperature
- 2° to 150° C (35.6° to 302° F)
Seat / Seal Material
- Sealing: EPDM
- Valve Seat: 316Ti Stainless Steel
- District heating systems