Stafsjö has a full range of knife gate valves developed for tough abrasive slurry and other related process media such as sludge and process water.

Our valves for slurry handling covers several pressure classes making the range complete for both the processing plant as well for the tailing system. Our slurry valve SLV is typically used in the sizing process on cyclones, as isolation valve around slurry pumps or tanks. For fast removal, old non-centered pipe lines, low pressure applications we recommend our fully flanged slurry valve SLF. For the tailing system typically higher pressure valves like our SLH (20 bar/290 psi) or SLX 50 bar (720 psi) are required with our SLV and SLF used as "dropper arm" valves around the tailing pond.

Stafsjö’s WB14E knife gate valve is a high performance shut-off valve with superior flow characteristics, offering bi-directional zero leakage shut-off up to 150 psi/10 bar. It is suitable for media such as pulp stock, chemicals, sludge, bio mass, slurry and water. The fully lugged body design is suitable for dead-end services. Further technical information is available here...

Stafsjö’s HG and high pressure version HX features excellent flow characteristics and offers a really safe and reliable bi-directional tight shut-off on highly concentrated media and static media columns. This shut-off performance makes them especially suitable for severe services including pulp stock (pulp concentration <18%), liquor, reject, powder, ash and highly concentrated slurry. 

Stafsjö’s knife gate valve MV is used within many different fields of applications. In this video you can see it installed as a silo discharge valve with the seat side on the inlet side.

The valve has a gate with a bevel edge that effectively cuts through different media. In closed position the gate is pushed onto the seat which gives a tight and reliable sealing. This special shut-off technique makes the MV valve suitable for both fluids and dry media such as pulp, sludge, biomass, powder and different kinds of waste. Further technical information is available here...

Stafsjö WB valves are all bi-directional and can therefore be installed into pipe systems independent of pressure direction. Here you can see the WB14 installed on a sewage pump station.

Full bore and excellent flow characteristics makes them suitable for fluids, sludge and liquids with solids in suspensions such as water, sewage and bio mass. Further technical information is available here...