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Knife Gate Valve Type C

The type C Knife Gate Valve for bulk material is a unidirectional wafer valve which was designed especially for bulk material technology (powder or granulated materials). The Knife Gate Valve AKO type C is primarily used in the

  • chemical industries
  • mining industries
  • food/beverage industries
  • agriculture and
  • animal feed sector

The nominal widths available for bulk material range from DN50 to DN600 with flange connections complying with EN 1092-2 PN10 or alternatively, ANSI B16.5.

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Bulk Material Knife Gate Valve

Actuators of Knife Gate Valve type C

Drive variants offered include a manually actuated handwheel model with rising or non-rising stem, or alternatively a hand lever drive unit, or double-and single-acting pneumatic cylinders (spring return) and electric actuators.

Design features of Knife Gate Valve type C

The structure of the uni-directional Knife Gate Valves for bulk material encompasses a so-called wafer style cast monoblock body, with raised face and reinforced ribs for larger nominal diameters for extra body strength.

Moulded guide ribs ensure the slide plate motion and closing mechanism.

The great installation length of the monoblock body and the standard rinsing connections prevent material build-ups in the body. The rinsing connections serve to clean the cavities within the monoblock body.

The rinsing process can be undertaken with air, steam or various liquids.

The monoblock body is available in either grey cast iron (GG25) or alternatively in stainless steel AISI 1.4408 (CF8M).

The slide plate is manufactured using stainless steel AISI 304 or AISI 316 as standard.

The plate radius of the slide gate has a bevelled cutting edge. As a result, solids can be cut through and a tight seal can be achieved in the closed position. On request the thickness of the Knife Gate Valve for bulk materials plate can be increased for higher operating pressures and/or higher quality material can be used.

The slide plate's seat in the monoblock body is sealed tight by an elastomer seal in a stainless steel retainer ring; however, this can also be achieved without the elastomer seal (sealed with metal).

The standard material used for the elastomer seal is EPDM. Alternatively, nitrile, viton, PTFE or silicone (FDA certification) are available.

The gland packing consists of several layers of braided fibre. An EPDM o-ring is additionally integrated into the layers of the gland packing as standard. In addition to greased cotton, a PTFE-coated synthetic fibre, braided PTFE, graphite, ceramic fibre or Dynapack can be used for the braided fibre.

Maximal operating pressures for AKO Knife Gate Valve type C

DN50-DN250: 10/3 bar
DN300-DN400: 6/2 bar
DN450: 5/1,5 bar
DN500-DN600: 4/1 bar

Standard flange connection

EN 1092-2 PN 10 and ANSI B16.5 (class 150)


DIR 97/23/CE (PED) Fluid: Group 1(b), 2 (Cat. 1, modul A)
DIR 94/9/CE (ATEX) Group II, Cat.  3: zones 2 and 22.