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VFQ Valve for AFPB/AFPB-F & AFPQ/AFPQ 4

Brand: Danfoss

The controller is a self-acting differential pressure controller with flow limitation primarily for use in district heating systems. The controller closes on rising differential pressure or when set maximum flow is exceeded. 

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

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

1 - 12 of 31 Part Numbers
065B26
065B26
  • Size - DN 15
  • Maximum Temperature Range - 150° C (302° F)
065B2654
065B2654
  • Size - DN 15
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2655
065B2655
  • Size - DN 20
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2656
065B2656
  • Size - DN 25
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2657
065B2657
  • Size - DN 32
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2658
065B2658
  • Size - DN 40
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2659
065B2659
  • Size - DN 50
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2660
065B2660
  • Size - DN 65
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2661
065B2661
  • Size - DN 80
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2662
065B2662
  • Size - DN 100
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2663
065B2663
  • Size - DN 125
  • Maximum Temperature Range - 150° C (302° F)
  • Flange Connection - PN 16
065B2667
065B2667
  • Size - DN 15
  • Maximum Temperature Range - 200° C (392° F)
  • Flange Connection - PN 25
1 - 12 of 31 Part Numbers

Specifications

Brand

Approvals & Certifications

  • EN 1092-1

Cone Material

  • Valve Cone: 316L Stainless Steel, 1.4401

Connection Style

  • Flange

Differential Pressure

  • Maximum

Enclosure, Body Material

  • Valve Body: Cast Steel GP240 GH (GS-C 25) for PN 40
  • Valve Body: Ductile Iron EN-GJS-400 (GGG-40.3) for PN 25
  • Valve Body: Grey Cast Iron EN-GJL-250 (GG-25) for PN 16

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 - 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

Flow Rate

  • 4 to 160 m³/hour
  • Range of, Max.

Materials of Construction

  • Pressure Relieve System: (Bellows) 316Ti Stainless Steel, 1.4542

Media

  • Circulation Water, Glycolic Water up to 30 %

Nominal Pressure

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

Process Temperature

  • Media Temperature: 2° to 150° C (35.6° to 302° F) for VFQ 2 & VFQ 21
  • Media Temperature: 2° to 200° C (35.6° to 392° F) for VFQ 2

Seat / Seal Material

  • Sealing: EPDM for VFQ 21
  • Sealing: Metal for VFQ 2
  • Valve Seat: 420 Stainless Steel (1.4021)

Setting Range

  • psi: 1.45 to 21.76 (kPa: 10 to 150, bar: 0.1 to 1.5)
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