Test 1
Knife gate valves have historically been used for a defined application which is generally on-off manual /actuated for typically low pressure sludge duty. Today’s AVK knife gate valve is ‘more than just a knife valve’.
AVK UK manufactures an extensive range of products in the UK as well as in our manufacturing plants globally. Many of these products overlap in terms of functionality and are ultimately specified by designers who consider not only the traditional valve features such as valve type, materials, coatings but elements such as face to face dimensions, working envelope and lead times which all contribute to the final valve choice.
Knife gate valves have historically been used for a defined application which is generally on-off manual /actuated for typically low pressure sludge duty. Today’s AVK knife gate valve is ‘more than just a knife valve’.
AVK UK’s Stuart Montgomery said “Whilst offering a light weight design, 100% tightness in both directions, full bore capability and short face to face dimensions to name but a few, the AVK UK knife gate valve is one such product that is truly versatile”.
Choice of Sector and Materials
The variety of component and sealing materials available make this valve commonplace in many sectors with duties ranging from within sludge control – waste water, mining, power plants, pulp mills and many more.
Materials of construction
• Body materials include ductile iron, carbon steel, stainless steel 316, duplex and super duplex.
• Seating materials include NBR, EPDM, EPDM WRAS approved, VITON, silicone, natural rubber and polyurethane.
• All of these dependant on the media and temperature requirements.
Choice of working pressures
Many associate a knife gate valve for operation where working pressures are typically low; sludge plants where pressures such as 4/5 bar, even less are the norm, however AVK routinely manufactures knife gate valves that in some cases exceed 100 bars. These are very much dependant on valve size, please see figure.
In addition the working pressure of the valve can be reduced to suit the application whilst still maintaining PN16 flanges. This reduces the valves weight and cost, and is a standard specification for the UK water industry.
711/50-000 – ORION COUPLING, NON-TENSILE
Variant: 711/50-000 – AVK Orion universal straight coupling, flange adapter, spigot coupling and step coupling for cast iron, steel, uPVC, AC, PVC and PE pipes with tolerances from 46-358 mm. One coupling per nominal size. We recommend the use of stainless steel support bush at PE pipes.
728/1-001 – TAPPING SADDLE, STAINLESS STEEL
Variant: 728/1-001 – AVK saddles, type FSA bush are designed with the highest attention in every detail. The tapping saddle is provided with a wafer structured rubber sealing and together with the specially designed lug construction for assembling it can guarantee a high degree of sealing. The bolt connection is provided with a high-grade Teflon coating, which makes galling belong to the past. The welded joints are carried out by a robot to exclude the probability of errors. Of course, the complete tapping saddle is fully passivated after welding. By using this saddle in your network it ensures unmatched reliability.
