Knife Gate Valves - VN Series | Wey Valves | Semi-Lug Isolation
Knife Gate Valves - VN Series | Wey Valves | Semi-Lug Isolation

Knife Gate Valves - VN Series | Wey Valves

WEY VN Knife Gate Valve – Semi-Lug Design

The WEY VN series is a bidirectional semi-lug isolation valve for liquids, sludge, slurry, fibrous media and viscous products. The gate is mechanically guided throughout its travel and supported in the closed position. The body geometry directs accumulated material away from the guides and back into the flow passage.

Technical Data

  • Nominal sizes: DN50–DN1400

  • Operating pressure: up to 10 bar, depending on DN and actuator

  • Typical limits: DN50–DN200 up to 10 bar, DN250–DN300 up to 6 bar, DN350–DN400 up to 4 bar

  • Flange connections: PN10, PN16, BS10-D/E or AS2129-D/E

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

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

  • Body materials: EN-GJL-250 or stainless steel 1.4408

  • Gate materials: stainless steel 1.4301 or hard chrome-plated 1.4404

  • Standard seat seal: NBR

The transverse seal limits leakage to atmosphere and can be readjusted through lateral compression screws while the valve remains installed. For media containing long fibres, the Weyotine cutting arrangement can be specified to reduce obstruction during closing.

Actuator Options

  • VNA: handwheel or bevel gearbox

  • VNB: quick-action lever, up to 1 bar

  • VNC: pneumatic or hydraulic cylinder, typically 6–8 bar air supply

  • VNE: electric actuator

Applications

Wastewater, sludge, biogas, pulp, mining slurry, chemical effluent, bitumen, seawater and food-process lines containing suspended solids.

FAQ

Is the VN suitable for flow control?
The standard version is intended for on/off isolation. The VNC-R variant uses a 60° V-Port gate and pneumatic positioner for modulating service, subject to differential-pressure limits.

Can it be installed as an end-of-line valve?
Yes, with a reinforced elastomer seal and verification of the allowable pressure for the selected nominal size.

Standard (Options)
  • DIN
Material (Options)
  • EN-GJL-250
  • 1.4301
  • 1.4404
  • 1.4408
Pressure Rating (Options)
  • PN 10
Seat (Options)
  • NBR

Datasheet and documents

Description

The VN series combines all the properties of a knife gate valve in an inexpensive semi-lug flange design, in order to meet the most common market requirements. With this series, we guarantee the greatest possible functional and operational safety, in an easy-to-maintain, optimized design. We guarantee a 100 % bidirectional bubble-tight shut off over the entire pressure range. For many applications this results in a balanced cost-benefit ratio in terms of investment and maintenance.

Characteristics

  • Nominal sizes: 50 – 1400 mm
  • Material: Stainless steel, Cast iron, Special material
  • Pressure rating: 0 – 10 bar
  • Flange drilling: PN10, BS10-D, BS10-E, AS2129-D, AS2129-E
  • 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.

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 add-on Weyotine cutter-pack can be used to cut long-fiber media, preventing jamming and blockages.

Application Areas

Biogas plants

e.g. Food waste, Household waste, Wood chips, Manure, Substrates, Other renewable resources ...

Chemical and petrochemical industries

e.g. Viscous pastes, Granulates, Chemically contaminated waste water, Bitumen/tar ...

Food and beverage

e.g. Syrups, juices and beverages, Cereal, vegetable, mash, etc., Processed fruits, Cheese powder, Cocoa beans ...

Waste water treatment plants

e.g. Waste water, Raw water, Sludge, Digested sludge, Floating sludge ...

Mining

e.g. Coal dust, Mining slurry, Sinter water, Tailings, Acids and phosphates ...

Infrastructure

e.g. Waste water, Rainwater, Industrial water, Mixed water ...

Pulp and paper industry

e.g. Pulp Stock (Low to high density), Liquor (black, white, green), Chemical solutions, bleaching agents, Recycling tissue ...

Water treatment

e.g. Seawater, Saltwater ...

Material Of Construction

PartCast IronStainless Steel
BodyEN-GJL-2501.4408
Gate1.43011.4404*
SealNBRNBR
TopworkCarbon steelCarbon steel
Stem / Piston rod1.41041.4104

Other materials upon request  *hard chromed

Corrosion Protection

BodyEKB powder coat
TopworkEKB powder coat