Images are representations only.
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
