Knife Gate Valve

The knife gate valve is predominantly used in the paper and pulp, chemical, and mining industries, in power station technology and the food industry.

However, the knife gate valves are increasingly being used in biogas plants, sewage treatment plants, and in the sugar, steel and animal feed sectors.

The structure of the unidirectional knife gate valves encompasses a so-called wafer style cast monoblock body, with raised face and reinforced ribs for larger nominal diameters for extra body strength.

The slide plate of the knife gate valves is manufactured using stainless steel AISI 304 or AISI 316 as standard. The plate radius of the knife gate valves 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's 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 knife gate valves elastomer seal is EPDM. Alternatively, nitrile, viton, PTFE or silicone (FDA certification) is available.

The gland packing consists of several layers of braided fibre. An EPDM o-ring is additionally integrated into the layers of the knife gate valves 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.