Stafsjo

Stafsjö Valves AB, a pioneer in knife gate solutions since 1666, continues to set global standards in reliability, innovation, and performance for industries ranging from pulp and paper to mining, steel, power, offshore, and water treatment. With centuries of engineering excellence and a comprehensive product portfolio, Stafsjö remains the trusted partner for high-performance knife gate valves worldwide.

Founded in 1666 by Gerdt Störning, Stafsjö began as a cannon manufacturer, supplying artillery across Europe for nearly two centuries. By 1881, the company shifted its focus to valve production, marking the beginning of a new era in industrial solutions. In 1928, Stafsjö introduced its first knife gate valve, the “Massaventil,” engineered for pulp stock applications. This innovation laid the foundation for Stafsjö’s reputation as the global leader in knife gate technology.

Over the decades, Stafsjö has consistently advanced valve engineering:

1968: Launch of the through-going H2G valve, now known as HG, for high pulp consistency.
1989: Introduction of the RKO valve for severe junk trap services.
2002–2007: Expansion into chemical-resistant valves, wastewater solutions, and complete junk trap systems.
2012–2016: Development of high-pressure ranges (HX, SLH, SLX) and the WB14E valve with bi-directional zero leakage shut-off.

Today, Stafsjö delivers over 22,000 valves annually to industries worldwide, combining tradition with cutting-edge technology.

Knife Gate Valves – Engineered for Demanding Applications

Stafsjö’s knife gate valves are renowned for superior flow characteristics, reliable shut-off, and long service life. The product portfolio, as detailed in the company’s technical range, covers diverse industrial needs:

MV Series

High-performance standard valve for on-off and control in wet and dry processes.
Modular design ensures low cost of ownership and easy maintenance.

TV Series

Tank isolation valve with short face-to-face dimensions.
Unique flange drilling pattern allows direct assembly on tanks without draining.

WB Range (WB, WB11, WB12, WB14)

Bi-directional sealing independent of pressure direction.
Ideal for water treatment and biomass installations.
WB14E: Resilient seated valve offering zero leakage shut-off, suitable for dead-end services.

XV Series

Retainer ring sealing system ensures perfect gate guidance and resistance to pressure peaks.
Available in fully or semi-lugged body designs.

Junk Trap JT

Designed to minimize turbulence and erosive wear in cleaners.
Supplied with RKO and JTV valves for efficient reject handling.

SLV and SLF

Push-through slurry valves for highly abrasive applications.
SLV: Compact lugged version; SLF: Wide-body, fully flanged heavy-duty design.

RKO

Robust valve for high-density cleaners with abrasive solids.
Straight bevel gate edge ensures tight sealing and full release of difficult media.

HL, HG, HP, HPT

Through-going gates deliver bi-directional zero leakage shut-off.
Ideal for pulp tower isolation, customizable for different process conditions.

D2G

Dual hard-chromed gates for fast operation.
Suitable for stock preparation and recycled fibre lines.

RKS

Welded isolating valve for low-pressure sludge, powder, or granulate systems.
Available in square or rectangular bores.

HX

Reinforced high-pressure valve for demanding chemical and pulp processes.
Offered in stainless steel, SMO 254, and titanium for chlorine and bleaching stages.

SLH and SLX

Extreme slurry valves rated for 20–50 bar pressure, designed for tailing systems.

Industries Served

Stafsjö valves are trusted across multiple sectors:

Pulp & Paper – isolation and control in pulp towers and fibre lines.
Mining – handling abrasive slurry and tailings.
Steel & Power – reliable shut-off in demanding environments.
Offshore & Chemical – corrosion-resistant solutions for harsh conditions.
Water Treatment & Biomass – bi-directional sealing for clean processes.
Food & Beverage – hygienic and durable valve solutions.

With a heritage spanning 360 years, Stafsjö continues to lead the industry in knife gate valve innovation. From the MV standard valve to the extreme SLX slurry valve, Stafsjö’s portfolio addresses the most challenging industrial applications. Combining Swedish engineering tradition with modern manufacturing, Stafsjö remains the first choice for knife gate solutions worldwide.

We are Stafsjö Certified Partner in Vietnam

Established in 2016, ATZ Solutions Co., Ltd. is committed to bridging global technology with domestic industries, delivering comprehensive industrial solutions. As a trusted partner of leading brands such as Valmet Automation, Valmet Flow Control, Endress+Hauser, ProMinent, Oilon, and Stafsjö, ATZ Solutions stands out in sectors including pulp & paper, chemicals, energy, water, and wastewater. With a highly skilled technical team and extensive project experience, we are a reliable partner driving industrial innovation in Vietnam.