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    The extreme high pressure valve for highly
    concentrated media and static media columns
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    DN 200 - DN 900 (8” - 36”)

Knife gate valve HX

Stafsjö’s knife gate valve HX is an extreme high pressure valve for really demanding applications. It features excellent flow characteristics and provide a tight seal independent of pressure direction. The through-going gate ensure reliable shut-off on highly concentrated media such as pulp stock up to 18 % concentrations, liquor, powder and ash.

The HX valve is modular designed and it can easily be customized in materials, with actuators and related automation accessories to different process conditions. The valve has an extra solid two piece precision machined valve body with a high strength top works that provide an essential and precise gate alignment. As standard it is available with a valve body in stainless steel, but it can also be supplied in a range of high alloy materials such as Duplex, 254 SMO and Titanium. 

The HX valve is one out of five valves in Stafsjö’s procuct range with through-going gates. The HG valve represent the standard. HL is a slim line version of HG while HP is high pressure version. HPT is a high pressure version entirely made in Titanium.



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

The through-going gate is guided and internally supported throughout the entire stroke. It can operate smoothly through difficult and highly concentrated media. The retainer ring system (1) on both side of the gate provide a tight seal independent of pressure direction. On each opening stroke the lower machined flat gate orifice (2) force media upward and back into the pipe.

Full bore with outstanding flow characteristics

When the HX is in open position you have an unobstructed flow path where no media can collect. The enlarged and reinforced PTFE seats (3) are protected by the gate (4) and retainer rings (5). The internal back-up o-rings (6) keep the seats pressurized against the gate.  

Reinforced gland box sealing system enable a tight seal to environment

The increased body and gate thickness makes the gland box sealing system steady and reliable at high pressure loads. Stafsjö’s TwinPack (7) braids and dual reinforced PTFE scrapers (8) ensure no media reaches surrounding environment.  

Contact us if you have any questions