Stafsjö aim for high pressure applications with the HX valve

The HX valve is an extreme high pressure valve for severe operating conditions, high pressures and concentrated media within several field of applications. It is also a complement to the existing range of through-going “O” port gates, the HL, HG, HP and HPT, that have been proving for decades a really safe and reliable shut-off of static media columns, such as pulp up to 18%.

– It is common for Stafsjö to work close with customers to understand the process requirements and to develop products suitable for the specific applications. This HX valve is a result of this. With this new HX valve we are able aim for a new spectra of applications, especially within the pulp and paper industry, and we will also be a stronger player on large scale projects with this new product in our range, says Maria Persson, Sales and Marketing Director at Stafsjö Valves AB.

Product features

The HX valve has excellent flow characteristics and it seal tight independent of pressure direction. It is equipped with a through-going “O” port gate that gives a secure shut-off of concentrated media at very high pressures. The HX is mainly developed for severe operating conditions with high pulp concentrations at high pressures, but it can also work in different fields with powder, slurry and ash.

The HX has a strengthened two piece valve body in stainless steel with purge ports and integrated guiding pads, but it can also be supplied in materials such as Duplex or Titanium. Just like several other Stafsjö valves, the HX comes with the retainer ring system that mechanically hold the seat on place which also makes it really easy to maintain – thus achieving low life cycle cost. The gland box system is also strengthened to withstand a tight sealing towards the environment. 

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

Sealing principle

When the valve is fully open the bore is free from cavities and the flow characteristic is excellent. In this position the two seats are protected by the retainer rings and the gate, preventing media from entering the valve body.

When the valve is operated from opened to closed position, the valve body, gland boxes and the seats gives the gate continuous support for reliable and secure shut-off. Internal guiding pads make this operation smooth and easy. When the valve closes some media can enter the valve body, but it is returned to pipe line when the valve is operated to open position. Stafsjö’s unique gland box packing system with TwinPack™ and extra scrapers gives a secure sealing where the gate exit the valve body and assures that no media reaches surrounding environment.

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