VFG 2/VFG 21 2-Way Valve

Brand: Danfoss

The controller is a self-acting differential pressure controller primarily for use in district heating systems. The controller closes on rising differential pressure. 

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

Further on two valve versions are available:
  • VFG 2 with metallic sealing cone
  • VFG 21 with soft sealing cone

Specifications

Brand

Applications

  • Heating Systems

Cone Material

  • 316L Stainless Steel, 1.4401
  • 420 Stainless Steel (1.4021)

Connection Style

  • Flange

Diaphragm Material

  • EPDM - Pressure Relieve System

Differential Pressure

  • psi: 145 to 290.1 (kPa: 1,000 to 2,000, bar: 10 to 20)

Enclosure, Body Material

  • Cast Steel GP240 GH (GS-C 25) - Valve
  • Ductile Iron EN-GJS-400 (GGG-40.3) - Valve
  • Grey Cast Iron EN-GJL-250 (GG-25) - Valve

Flange Size - 1-1/2” (DN 40)

  • 1-1/2” (DN 40) - PN 16
  • 1-1/2” (DN 40) - PN 25
  • 1-1/2” (DN 40) - PN 40

Flange Size - 1-1/4” (DN 32)

  • 1-1/4” (DN 32) - PN 16
  • 1-1/4” (DN 32) - PN 25
  • 1-1/4” (DN 32) - PN 40

Flange Size - 1” (DN 25)

  • 1” (DN 25) - PN 16
  • 1” (DN 25) - PN 25
  • 1” (DN 25) - PN 40

Flange Size - 1/2” (DN 15)

  • 1/2” (DN 15) - PN 16
  • 1/2” (DN 15) - PN 25
  • 1/2” (DN 15) - PN 40

Flange Size - 10” (DN 250)

  • 10” (DN 250) - PN 16
  • 10” (DN 250) - PN 40

Flange Size - 2-1/2” (DN 65)

  • 2-1/2” (DN 65) - PN 16
  • 2-1/2” (DN 65) - PN 25
  • 2-1/2” (DN 65) - PN 40

Flange Size - 2” (DN 50)

  • 2” (DN 50) - PN 16
  • 2” (DN 50) - PN 25
  • 2” (DN 50) - PN 40

Flange Size - 3” (DN 80)

  • 3” (DN 80) - PN 16
  • 3” (DN 80) - PN 25
  • 3” (DN 80) - PN 40

Flange Size - 3/4” (DN 20)

  • 3/4” (DN 20) - PN 16
  • 3/4” (DN 20) - PN 25
  • 3/4” (DN 20) - PN 40

Flange Size - 4” (DN 100)

  • 4” (DN 100) - PN 16
  • 4” (DN 100) - PN 25
  • 4” (DN 100) - PN 40

Flange Size - 5” (DN 125)

  • 5” (DN 125) - PN 16
  • 5” (DN 125) - PN 25
  • 5” (DN 125) - PN 40

Flange Size - 6” (DN 150)

  • 6” (DN 150) - PN 16
  • 6” (DN 150) - PN 40

Flange Size - 8” (DN 200)

  • 8” (DN 200) - PN 16
  • 8” (DN 200) - PN 40

Flow Rate

  • 4 to 630 m³/hour

Materials of Construction

  • 316Ti Stainless Steel, 1.4542 - Pressure Relieve System

Measuring Range

  • pH: 7 to 10

Media

  • Circulation Water
  • Glycolic Water up to 30 %

Mounting Position

  • Any DN 15 to 80, Tmax ≤ 120° C (248° F)
  • Horizontal for DN 15 to 80 Tmax > 120° C (248° F), DN 100 to 250

Nominal Pressure

  • psi: 232.1 to 580.2 (kPa: 1,600 to 4,000, bar: 16 to 40)

Process Fitting Details

  • Compression Fitting G 1/4” for Impulse Tube

Process Temperature

  • 2° to 150° C (35.6° to 302° F) - VFG 21
  • 2° to 200° C (35.6° to 392° F) - VFG 2

Seat / Seal Material

  • 420 Stainless Steel (1.4021)
  • Seal: EPDM (VFG 21)
  • Seal: Metal (VFG 2)
  • Seat: CA 6-NM Stainless Steel (1.4313)

  • Heating Systems

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