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    The most reliable knife gate range for highly
    concentrated media and static media columns
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    DN 200 - DN 900 (8" - 36")

High pressure knife gate valves HP & HPT

Stafsjö’s high pressure knife gate valves HP and HPT are strenthened to withstand high bi-directional pressures. They are equipped with through-going "O" port gates and this secure a really safe and reliable shut-off of static and highly concentrated media. This shut-off performance, along with its excellent flow characteristics, makes them suitable for really demanding operating conditions with media as pulp (pulp concentration < 18%), liqour and highly concentrated slurry.

The valves are three out of five valves in Stafsjö's product range with through-going gates. The HG represent the standard version while the HL is a slim line version of HG available in larger sizes and the HP is a high pressure version of HG. HPT is a high pressure version entirely made in Titanium and finally the HX is an extreme high pressure version for pressure rating PN20.

The valves are all modular designed and they can easily be customized with gate, seats and box packings according to media and requirements, as well for actuators and accessories.

The HP valve is available DN 300 up to DN 900 (3" to 36"). The HPT from DN 200 up to DN 600 (8" to 24") and finally the HX from DN 200 up to DN 900 (8" to 36"). Other sizes on request. Further information is available in the product data sheets.


Full bore with outstanding flow characteristics

While the valve is in open position you have an unobstructed flow path where no media can collect. The PTFE seats (1) are protected by the gate (2) and retainer rings (3) and the internal back-up o-rings (4) keep the seats constantly pressurized against the gate. 

Reliable through-going and bi-directional zero leakage shut-off

The gate is guided throughout the entire stroke and operates smoothly through diffi-cult and highly concentrated media. The retainer ring system (5) on both side of the gate provide a tight seal independent of pressure direction. The gland box sealing system with three layers of Stafsjö’s Twin-Pack (6) ensures that no media reaches surrounding environment. Extra scrapers or double gland can be used for the most demanding services. 

The retainer ring system extend service life and makes it easy to process customize the valve

The retainer rings (7) hold the seats (8) and the back-up o-rings (9) in exact correct position as the gate strokes. They are mechanically locked and can easily be removed for seat change. Both the retainer rings and seats are available in different materials which makes it easy to customize the valve to different process conditions.

Contact us if you have any questions