Knife Gate Valves - VG Series | Wey Valves for Biogas Applications
Knife Gate Valves - VG Series | Wey Valves for Biogas Applications

Knife Gate Valves - VG Series | Wey Valves

WEY VG Knife Gate Valve – Biogas Applications

The WEY VG series is a bidirectional isolation valve developed for agricultural biogas plants. Its flange pattern is adapted to digester and substrate-handling equipment where standard industrial flange dimensions may not match the installed connections.

Technical Data

  • Nominal sizes: DN150 and DN200

  • Operating pressure: up to 4 bar for DN150 and 2.5 bar for DN200

  • Lever-operated version: up to 1 bar

  • Face-to-face dimension: EN 558 / ISO 5752, Series 20

  • Leakage test: EN 12266-1, Leakage Rate A

  • Body material: EN-GJL-250 grey cast iron

  • Gate material: stainless steel 1.4301

  • Seat seal: EPDM

  • Stem material: stainless steel 1.4104

  • Corrosion protection: electrostatic powder coating

The gate is mechanically guided throughout its travel and supported in the closed position. The body geometry directs accumulated substrate back into the flow passage during opening. The transverse seal can be readjusted through lateral compression screws while the valve remains installed.

Actuator Options

  • VGA: handwheel

  • VGB: quick-action lever

  • VGC: pneumatic cylinder, 6–8 bar air supply

Actuator selection depends on nominal size, differential pressure, operating frequency and substrate consistency.

Applications

Manure, fermented sludge, organic substrates and viscous mixtures containing fibres or suspended solids in digesters, feed lines and biogas processing systems.

FAQ

Why does the pressure rating differ by nominal size?
The DN150 version is rated up to 4 bar, while DN200 is limited to 2.5 bar. The actuator type may further limit the permissible differential pressure.

Is the VG suitable for throttling?
No. The standard configuration is intended for full open or full closed isolation.

Material (Options)
  • EN-GJL-250
  • 1.4301
Seat (Options)
  • EPDM

Datasheet and documents

Description

Wey VG knife gate valves are products with a special flange. They were specifically developed for biogas applications in agriculture, since standard DIN gate valves for industrial pipelines are not compatible. The VG is available exclusively in cast iron, and only in the nominal sizes DN 150 and DN 200.

Characteristics

  • Nominal sizes: 150 – 200 mm
  • Material: Cast iron
  • Pressure rating: 0 – 4 bar
  • Flange drilling: Special flange
  • Face to face dimension: EN 558 series 20

Details

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

With its optimized gate geometry, accumulated media is pushed out of the gate guide and flushed out into the bore by the increased flow.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

A unique transverse seal, consisting of a transverse seal profile and packing compound, makes the body bubble-tight towards the atmosphere.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

The transverse seal can be repacked at any time and under full pressure using the lateral packing screws.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

A mechanically retained round cord seal creates a bubble-tight shut off on the gate edge.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

The gate is mechanically guided over the full stroke.

The robust metal yoke enables the optimal, simple assembly of mechanical or inductive limit switches. The yoke can be removed from one side. This makes it easier to access the mechanical parts.

In the closed end position, the gate is also mechanically supported.

Application Areas

Biogas plants

e.g. Manure, Substrates ...

Material Of Construction

PartCast iron
BodyEN-GJL-250
Gate1.4301
SealEPDM
TopworkCarbon steel
Stem / Piston rod1.4104

Other materials upon request

Corrosion Protection

BodyEKB powder coat
TopworkEKB powder coat