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Powder Butterfly Valve V.FS: Reading the Model Code

Created on 07.10
Our powder butterfly valve range carries a model code that specifies, in a single string, the body configuration, the bore, the disc material, the seal compound and the accessories. Reading it correctly removes most of the ambiguity from ordering a valve, and it makes a spare-parts conversation much shorter. Here is how the code is built.

The Structure

A typical code looks like V2FS300GBN-WF. Reading left to right:
  • V2FS
  • 300
  • GB
  • N
  • -W
  • F

The Body Configuration Prefix

Prefix
Meaning
V2FS
Double-flanged (wafer/lug style with flanges on both sides)
VFS
Single-flanged
V1FS
Single-flanged, sleeve type
The bore range runs from DN100 to DN400. Selection is driven by the line size and by the flow velocity the product will see — higher velocity in abrasive powder accelerates wear, so the bore should be sized for the intended velocity rather than the smallest that will fit.

Disc / Plate Material

Code
Material
Where it belongs
S
Dust disc / wear-resistant anti-slip plate
Standard dry powder duty; the usual default
GB
Ductile iron
Abrasive dry bulk; strong and economical
A
Stainless steel 304 / 316
Food, pharmaceutical and mildly aggressive product
L
Aluminium
Weight-sensitive installations

Seal Compound

Code
Compound
Notes
N
NBR
General dry powder — cement, fly ash, general bulk. Roughly −20 to +80 °C
E
EPDM
Feed, grain, wash-down and humid plants. Better water and ageing resistance
SI
Silicone
Hot powder from dryers and kilns; widest temperature band
I
FDA food grade
Food and pharmaceutical contact — the compound is fixed by compliance

Accessories

The suffix indicates what is fitted alongside the valve. W denotes position feedback, so the plant control system can see whether the valve is open or closed. F denotes a solenoid valve for piloting the actuator. A code ending -WF therefore has both, which is the common industrial configuration: the plant can command the valve and confirm its position.
See the V.FS powder butterfly valve for the full range detail.

The Actuator

Butterfly valves in this range are typically fitted with a pneumatic quarter-turn actuator. The CP101 actuator (a 101 mm bore unit) covers V.FS valves from DN100 up to DN300 — that is, DN300 is its upper limit. It operates from 2 to 8 bar, through a 0°–90° stroke adjustable by ±5°, and is supplied in hard-anodised aluminium with NBR seals. Standard accessories include a position indicator for feedback and a 5/2 solenoid valve for control.
This is why the -WF suffix and the CP101 go together so often: the actuator package includes the feedback box and the solenoid, so the code reflects what is actually bolted to the valve.

Why the Code Matters in Service

Seals in a butterfly valve are wear parts. When one eventually needs replacing, the code tells you exactly which compound to order without dismantling the valve, and it tells the supplier whether the disc is ductile iron or stainless. A correct code is a correct spare.
Our valves carry a 12-month warranty on the valve body; elastomer seals and other wear parts are excluded, as is standard across the industry.

Specifying One

  1. Line size and required velocity → bore
  2. Flange arrangement → V2FS / VFS / V1FS
  3. Product abrasiveness and hygiene → disc material
  4. Product and temperature → seal compound
  5. Control requirements → accessory suffix
Send us those five answers and we will return a complete code. Compare butterfly options on the butterfly valve range, or read the bulk solids valve selection guide.
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