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“We strive to be the most accessible, reliable and cost-effective supplier of knife gate valves.”

“The production of knife gate valves started in 1928 in close co-operation with customers...”

“In order to guarantee valve function upon delivery the valves are pressure tested with water...”

Trust your instinct expect the bestStafsjö serves the international process industry with high performance knife gate valves. Outstanding performance, excellent reliability and low life cycle cost are some benefits to be expected from valves carrying Stafsjö’s name.

Stafsjö was founded in 1666 and is today one of Sweden’s oldest works still operating. The production started with cannons and it became a nearly 200 year long tradition. The production of knife gate valves started in 1928 in close co-operation with customers within the near-by pulp & paper industry. Since 2005 Stafsjö is part of the German family owned Bröer Group, which also consist of Ebro Armaturen – a leading supplier of butterfly valves, pneumatic and electric actuators.

A large proportion of our resources are devoted to research and development of new products. Thanks to close contacts with pioneers in the process industry, we are able to meet new needs and requirements as they arise. Changing conditions call for fresh thinking, aggressive en-vironments require high performance and unusual problems sometimes demands unusual solutions. Excellence and flexibility is a big part of our job and you should expect nothing less.

Since 1993 we have been ISO certified, currently in accordance with ISO 9001-2008. We are certified in accordance with the European Pressure Equipment Directive (PED) category II – and therefore controlled by an external certified body – module A1, which is a recognition of our am-bitious quality efforts and technical competence. In order to guarantee valve function upon delivery the valves are pressure tested with water according to EN 12266-1:2003. In opened position the valves are controlled with pressure equivalent to 1,5 times maximum allowed work-ing pressure and seat tightness test, i.e. closed valve, is performed with differential pressure equivalent to 1,1 maximum allowed differential pressure.

Globally active and locally committed

With flexible production, on-time deliveries and local market oriented stocks at our partners worldwide we can quickly and safely deliver what you need. Besides this you should also expect high quality service and support from us directly or from our sales partners. We strive to be the most accessible, reliable and cost-effective supplier of knife gate valves.

“All the valves are modular designed and each can be customized with specific materials, actuators and accessories”

Maximum working pressure body at 20°C in bar

Maximum differential pressure inpreferred direction at 20°C in bar

DN SLV1) MV WB DN SLV1) MV WB

50 10 16 10 50 10 16 10

65 10 16 10 65 10 16 10

80 10 16 10 80 10 16 10

100 10 16 10 100 10 16 10

125 10 16 10 125 10 16 10

150 10 10 10 150 10 10 10

200 10 10 10 200 10 10 10

250 10 10 10 250 10 10 10

300 10 10 10 300 10 10 10

350 10 6 6 350 10 6 6

400 10 6 6 400 10 6 6

450 10 6 4 450 62) 6 4

500 10 6 4 500 62) 6 4

600 10 6 4 600 62) 6 4

700 10 4 4 700 62) 4 4

800 10 4 4 800 62) 4 4

900 OR 4 4 900 OR 4 4

> 1000 OR < 4 < 4 > 1000 OR < 4 < 41) The SLV valve is also available in a high pressure version, the SLV-HP, for pressures classes up to 50 bar. 2) 10 bar on request

TwinPackTM

The braid is specially developed and made for Stafsjö’s valves. The TwinPack™ consists of a sili- cone rubber core surrounded by graphite impreg-nated and diagonally braided PTFE and aramide fibres. The rubber core gives a flexible and elastic packing while the aramide fibres, which are woun-ded into the corners, maintain the braid’s original cross section and increases the wear resistance.

Product range optimized through decades

Our product range consists of 20 different models available in sizes ranging from DN 50 up to DN 1600. Our standard range consist of knife gate valves in stainless steel, cast iron or nodular iron, but we are also able to supply valves in a range of high alloy materials such as Duplex, Hastelloy, SMO and Titanium. All the valves are modular designed and each can be customized with specific materials, actuators and accessories, and this also makes it easy to uphold flexibility and first-rate operation year after year.

In the processing of for example iron ore the equipment as valves are facing the toughest requirements. Our SLV valve is suitable for dem-anding slurry and other abrasive fluids and MV and WB are valves used in applications with water, sludge and light slurry.

Pressure classes

Customized – a standard featureSLV is modular designed and it can therefore easily be customized and supplied with specific seat material, alloy on the gate, actuator type and accessories. A modular design also means simple on-site maintenance.

Optimal valve design for slurryMinimal cavity and maximal flow capacity is achieved with full bore and the unique seat design. The seats can be supplied in EPDM, Viton and natural rubber, and flange gaskets are not needed since they are integrated with the seats.

Reliable shut-off for slurry and abrasive applicationsStafsjö’s knife gate valve SLV is bi-directional and suitable for the most demanding slurry where operation reliability and low life cycle cost are emphasized. The unique seat design and the full bore with minimal cavity, makes it possible for the valve to perform for extended periods on the most difficult abrasive fluids.

The SLV valve comes as standard in one or a two piece valve body in nodular iron with integrated purge ports, but it is also available in stainless steel for very corrosive applications. The valve has a gate in stainless steel which is hard chromed in order to maximize wear resistance and service life. The solid top works can be customized and supplied with many types of actuators and accessories. SLV is always supplied ready to be locked in either opened or closed position with a locking pin and it is also prepared to be equipped with a bottom cover.

The SLV is available in sizes from DN 50 up to DN 800 as standard and in larger sizes on request. The SLV is also available in a high pressure version, the SLV-HP, for pressure classes up to 50 bar.

Maximized service lifeThe bevel edge on the gate, the machi-ned gate support in the valve body and the suspension of the seats minimizes wear on the seats during operation, thus maximizing the valves’ service life. Rein-forcement rings embedded in seats en-sure position, shape and strength during valve operation.

Sealing principleSLV’s seats are developed for long-life service with slurry and other abrasive fluids. The seats and its material composition together with embedded reinforcement rings guarantee safe and reliable shut-off during tough operating conditions.

The gland box, which seals around the gate where it exit the valve body, is as standard supplied with three layers of our TwinPackTM and a box bottom scraper in order to give first-rate sealing capacity.

Opened valve

SLV’s seats are flexible in the axial way. When the valve is fully opened the seats are expanded and seals towards each other, thus forming a tight extension of the pipe line where only the seats are exposed to the media. The valve body and gate are not exposed to the media in this position. Minimal seat cavity prevent accumulation of media in the bore.

Closed valve

When the valve closes the two seats are displaced axially forming a seal with the gate until it forms a complete closure of the bore to a 100% tight valve in either pressure direction. Any residues can be evacuated either through the bottom of the valve or through the purge ports when the bottom cover is mounted.

Modular and solid top worksA solid top works ensures stabillity and gate alignment during operation and low operation force is achieved with minimal friction. The modular design offers flexi-bility and makes it easy to supply and to change actuator and/or accessories.

Proven and reliable shut-offThe MV valve is the outcome of several decades of experiences. The design of gate and valve body, especially the bore design, gives the valve its ability to securely and effectively shut-off almost any flow.

Excellent adaptabilityThe retainer ring system offers several seat materials and makes any mainten-ance smooth and cost-efficient. The valve can also be customized with valve material according to specific process conditions, for example in SMO254.

MVDN 50 - DN 1600

This is an allround valve used within many fields of applications since it is reliable and easy to customize. It is suitable for water, sludge and light slurry among many other media. MV is uni-directional, but in some sizes it is also able to cope with certain differential pressure in reversed pressure direction.

The valve is modular designed and supplied with the retainer ring system, which makes it easy to customize and to maintain. The gate has a bevel edge that effectively cuts through different media and the inner cavity of the valve body facilitate this process. In closed position the gate is pushed onto the seat and gives a tight and reliable sealing.

The valve is supplied in either stainless steel or nodular iron, but it also available in a range of high alloy materials such as Duplex, Hastelloy, SMO and Titanium. The top works consist of aluminum beams and stainless steel tie rods, which gives good corrosion resistance and stability at operation. There are several actuator types and accessories to choose from in our standard collection. Just like other Stafsjö valves the MV is as standard equipped with Stafsjö’s unique box packing, TwinPack™. The gland box can also be supplied with a box bottom scraper or with double gland for the most demanding applications.

Reliable bi-directional sealingThe gate edge, which is polished in order to minimize friction and to lower required operation force, faces the sealing profile and secures that the valve is tight in both pressure directions.

Excellent flow characteristicsA straight bore, with a sealing profile in level with bore, gives minimal pressure drop since the media can pass it practi-cally unnoticed.

WBDN 50 - DN 1600

This valve type is bi-directional and can therefore be installed into a pipe system independent of pressure direction and integrated flange gaskets makes it easy to install. The WB14 version has a fully lugged valve body and this also allows end-of-pipe installations. The WB valve has a full bore design with no cavity which gives excellent flow characteristics, and this makes it suitable for fluids such as water, sludge and light slurry.

The WB has a robust epoxy coated valve body in nodular iron or cast iron. It is equipped with a gate in stainless steel that has a polished edge in order to minimize friction and to lower required operation force. The sealing profile is available in Nitrile or EPDM. The gland box is equipped with Stafsjö’s box packing, TwinPack™, which gives a tight sealing and assures that no media reaches surrounding environment. A box bottom scraper, which is standard from DN 200, prolongs the box packing braids’ life length. The valve is modular designed and it can easily be supplied with different types of actuators and accessories.

The WB valve is available in several versions. Most common is the semi lugged version WB and WB11 which are available from DN 50 up to DN 1600. WB14 is supplied with a fully lugged valve body.

First-rate sealing capacityA gland box supplied with three layers of our TwinPackTM, which is specially developed and made for Stafsjö’s valves,secures that no media reaches surroun-ding environment.

sjo.comA Bröer Group company

Staf

sjö

2011

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30 u

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