Knife Gate Valves - MF Series | Wey Valves | Bidirectional
Knife Gate Valves - MF Series | Wey Valves | Bidirectional

Knife Gate Valves - MF Series | Wey Valves

WEY MF Knife Gate Valve – Central Flange Design

The WEY MF series is a bidirectional isolation valve for liquids, sludge, slurry, powders and granular media. Its body geometry limits solids accumulation around the gate guides, while the gate is mechanically supported throughout its travel and in the closed position.

Technical Data

  • Nominal sizes: DN50–DN2000

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

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

  • Flange connections: PN6, PN10, PN16, ASME Class 150, 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: ductile or grey cast iron, depending on DN

  • Gate material: stainless steel 1.4301

  • Seat seal: NBR; EPDM, FKM or PTFE options

The transverse seal limits leakage to atmosphere and can be readjusted through lateral compression screws without removing the valve. Adjustment must be uniform to prevent increased friction or gate jamming.

Actuator Options

  • MFA: handwheel or bevel gearbox

  • MFC: pneumatic cylinder, typically 6–8 bar supply

  • MFE: electric actuator with rising stem

  • Hydraulic cylinder upon actuator sizing

Applications

Wastewater, sludge, pulp, biogas, mining slurry, ash, lime powder, cement, granular solids and viscous process media. The standard configuration is intended for full open or full closed operation.

FAQ

Is the MF series bidirectional?
Yes. However, the preferred pressure direction should be observed when operating close to the maximum allowable differential pressure.

Can it be installed as an end-of-line valve?
Yes, subject to the applicable PED classification and the reduced allowable pressure specified for end-of-line service.

Standard (Options)
  • DIN
  • ANSI
Material (Options)
  • EN-GJL-250
  • EN-GJS-400-15 (Nodular Cast Iron)
  • 1.4301
Pressure Rating (Options)
  • PN 6
  • PN 10
  • PN 16
Seat (Options)
  • NBR

Datasheet and documents

Description

The MF is a universally applicable knife gate valve with a central flange design that will just about satisfy the customer's every need. As well as featuring the integrated Wey sealing system, the robust, modular design of the series is particularly advantageous. Choose from a variety of materials, add-on parts, and actuator options across the entire nominal size range. A true all-rounder.

Characteristics

  • Nominal sizes: 50 – 2000 mm
  • Material: Cast iron, Ductile iron
  • Pressure rating: 0 – 10 bar
  • Flange drilling: PN6, PN10, PN16, ANSI Class 150, 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.

Robust 4-post topwork for maximum load and a wide variety of actuator types.

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.

Optimized chest design to minimize the build-up of solids due to gate geometry.

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.

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.

Most known pipe-cleaning methods (e.g., pigs, brush cylinders, etc.) can be used with the body bore, resulting in minimal pressure drops.

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 non-rising stem in the manual actuator saves space and provides good mechanical power transmission.

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 ...

Coal fired power stations

e.g. Coal dust, Coal slurry, Lime powder, Flue ash ...

Waste water treatment plants

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

Cement industry

e.g. Cement, Lime powder ...

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-GJS-400-15EN-GJL-250
Gate1.43011.4301
SealNBRNBR
TopworkCarbon steelCarbon steel
Stem / Piston rod1.41041.4104

Other materials upon request

Corrosion Protection

Body2 Comp. Epoxy-Polyamide Resin Primer, 2 Comp. Polyurethane-Enamel-Top Coat
Topwork2 Comp. Epoxy-Polyamide Resin Primer, 2 Comp. Polyurethane-Enamel-Top Coat