Valves, Actuators & Pump Control

Stafsjö’s MP – the eighth knife gate valve generation

October 2015 Valves, Actuators & Pump Control

In 1928, Stafsjö started to manufacture knife gate valves in close co-operation with nearby pulp and paper mills. Now the company has introduced its eighth knife gate valve generation, the MP, which is a result of market driven requirements coupled with engineering experience gained over the years.

Stafsjö’s latest development for the pulp and paper industry, the MP valve, represents a new generation of shut-off valves which fully meet today’s market demands such as bi-directionality, full bore and minimum maintenance.

Product features

The MP is a bi-directional full bore valve which, together with its special shut-off design, makes it suitable for many different applications.

MP has a one piece body design in stainless steel and for reliability in applications with corrosive or clogging media the valve body comes with integrated purge ports as standard. It is also supplied with Stafsjö’s retainer ring system, which can be combined with several seat materials and this makes it easy to optimise the valve to specific process conditions. The valve has gate and cast bottom support cams to obtain bi-directional sealing. The gate support is available in a variety of materials to suit most applications.

The top work consists of aluminium beams and stainless steel tie rods which give good corrosion resistance and stability for manoeuvring. Several actuator types are available to choose from as standard as well as accessories and all remote operated valves are supplied with gate guards in stainless steel.

Sealing principle

When the valve is operated from the open to the closed position, the gate effectively cuts through the media. This is facilitated by the inner cavity of the valve body and the bevel edged gate. In closed position the gate is pushed against the seat and the gate support ensures a bi-directional seal together with the bottom support cams that stabilises the gate.

The gland box is equipped with three layers of our TwinPack and a scraper gives high operation reliability and prevents the media from reaching the surrounding environment.

For more information contact Fred Venter, Valve & Automation, +27 (0)11 397 2833,,


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