Knife Gate Valves - HD Series | Wey Valves | High-Pressure Isolation
Knife Gate Valves - HD Series | Wey Valves | High-Pressure Isolation

Knife Gate Valves - HD Series | Wey Valves

WEY HD Knife Gate Valve – High-Pressure Service

The WEY HD series is designed for isolation of high-pressure pipelines carrying slurry, sludge and media containing suspended or settling solids. Process pressure supports the seat sealing function, while the enclosed bonnet limits leakage to atmosphere and can be equipped with flushing connections for solids removal.

Technical Data

  • Nominal sizes: DN80–DN400

  • Design pressure: up to 100 bar, depending on DN and configuration

  • Flange connections: PN40, PN63, PN100 or ASME Class 600

  • Flange standards: EN 1092 / ISO 7005

  • Face-to-face dimension: manufacturer-specific

  • Body materials: ASTM A216 WCB or stainless steel 1.4408

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

  • Seat seal: PTFE

  • Stem or piston rod: stainless steel 1.4104

The four-column actuator frame withstands the increased axial loads generated at high differential pressure. Permissible pressure and temperature must be verified against valve size, body material, sealing system and process-medium compatibility.

Actuator Options

  • Manual bevel gearbox

  • Pneumatic cylinder

  • Hydraulic cylinder

  • Electric actuator

Actuator thrust is calculated according to differential pressure, nominal diameter, solids concentration, friction conditions and required closing time.

Applications

Mining slurry, tailings, dewatered sludge, digested sludge, mine-water systems and high-pressure lines in tunnelling, wastewater treatment and mineral-processing plants.

FAQ

When is the HD series selected?
When operating pressure exceeds the range of standard knife gate valves or when the medium contains abrasive and settling solids.

Are flushing connections required?
They are recommended for media with high solids content to reduce deposits inside the bonnet and along the gate guides.

Is the valve intended for throttling?
No. The standard HD configuration is intended for full open or full closed isolation service.

Standard (Options)
  • DIN
  • ANSI
Material (Options)
  • 1.4301
  • 1.4404
  • 1.4408
  • ASTM A216 WCB
Pressure Rating (Options)
  • PN 40
  • PN 63
  • PN 100
Seat (Options)
  • PTFE

Datasheet and documents

Description

The HD series is an extraordinary development of the Wey knife gate valve for operation up to a maximum pressure of 100 bar. The ingenious design ensures that the pressure of the medium creates an automatic sealing effect inside the seat area. The special bonnet design also allows media containing solids to be flushed out – and, of course, it is completely airtight. This makes the HD series ideal for the most difficult applications.

Characteristics

  • Nominal sizes: 80 – 400 mm
  • Material: Stainless steel, Cast steel
  • Pressure rating: 0 – 100 bar
  • Flange drilling: PN40, PN63, PN100, ANSI Class 600
  • Face to face dimension: Special length

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.

Inline pressure creates an automatic sealing effect in the seat area.

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.

Application Areas

Mining

e.g. Mining slurry, Tailings ...

Waste water treatment plants

e.g. Sludge, Digested sludge ...

Material Of Construction

PartCast IronStainless Steel
BodyA216 WCB1.4408
Gate1.43011.4404*
SealPTFEPTFE
TopworkCarbon steelCarbon steel
Stem / Piston rod1.41041.4104

Other materials upon request  *hard chromed

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