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AVPA Differential Pressure Relief Controller

Brand: Danfoss

AVPA is a self-acting differential pressure relief controller primarily for use in district heating systems. The controller is normally closed and opens on rising differential pressure. 

The controller has a control valve, an actuator with one control diaphragm and handle for differential pressure setting.

Specifications

Brand

Actuator Size

  • 6.04 in² (39 cm²) for PN 16
  • 8.37 in² (54 cm²) for PN 25

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 - Valve

Diaphragm Material

  • EPDM

Differential Pressure

  • psi: 174 to 290 (kPa: 1,200 to 2,000, bar: 12 to 20) - Max.

Enclosure Finish

  • Black - Spring Colour: PN 16
  • Grey - Spring Colour: PN 16
  • Red - Spring Colour: PN 25
  • Yellow - Spring Colour: PN 25

Enclosure, Body Material

  • 304L Stainless Steel - Upper Casing of Diaphragm
  • Dezincing Free Brass CuZn36Pb2As - Lower Casing of Diaphragm
  • Ductile Iron EN-GJS-400-18-LT - Valve
  • Red Bronze CuSn5ZnPb (Rg5) - Valve
  • Zinc Chromatic Steel, DIN 1624, No. 1.0338 - Actuator

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 16
  • 1” (DN 25) - PN 25

Flange Size - 1/2” (DN 15)

  • 1/2” (DN 15) - PN 16
  • 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 16
  • 3/4” (DN 20) - PN 25

Flow Rate

  • 4 to 25 Kvs (m³/hour)

Materials of Construction

  • Copper Tube Ø 6 x 1 mm - Impulse Tube
  • Piston

Measuring Range

  • pH: 7 to 10

Media

  • Circulation Water
  • Glycolic Water

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
  • Seat: 316Ti Stainless Steel - Valve

Setting Range

  • psi: 0.72 to 29 (kPa: 5 to 200, bar: 0.05 to 2)

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