Chemical Technology June 2015

21 / 40

Stafsjö continues to focus on engineering
and manufacturing of high pressure valves
and introduces the SLH and SLX for really
demanding applications with slurry and
other abrasive media.
Since the introduction of Stafsjö’s first
slurry valve, the SLV, in 2009, applications
requiring extreme performance require-
ments at really high pressures have become
common. In order to win large slurry proj-
ects, Stafsjö realized that it needed to have
high pressure slurry valves in its product
range. Now that it has them available, Maria
Persson, Sales and Marketing Director at
Stafsjö says she is looking forward to bid-
ding on upcoming projects.
Stafsjö’s SLH is able to cope with pres-
sures up to 20 bar, while the SLX can cope
with pressures as high as 50 bar. Just like
Stafsjö’s other slurry valves, the SLH and
the SLX are designed to give a tight shut-off,
independent of pressure direction. The flow
capacity is maximized with a full bore and
minimal seat cavity, and at the same time,
stresses and wear on the equipment are
minimized, resulting in long service life of
the valve and related process equipment.
The SLH and SLX have epoxy-coated fully
lugged valve bodies in nodular iron with
integrated purge ports. The reinforced seats
are flexible in an axial way and seals towards
each other in the bore when the valve is in
the open position, thus protecting internal
parts and the gate from the abrasive high
pressure media. Upon closure, the seats
are displaced axially, forming a seal with the
gate until it forms a complete closure of the
bore and gives a bi-directional tight shut-off.
The seats also form a sealing face on the
valve flanges saving the need for gaskets.
The gate is supplied in high strength stain-
less steel, coated to give a hard and high
wear and corrosion resistance surface. For
security reason the valves are always sup-
plied ready to be locked in either opened or
closed position. The gland box, with three
layers of TwinPack TM and a box bottom
scraper, gives the gate guidance during
operation and makes sure that a first-rate
sealing is preserved.
Both SLH and SLX have solid top works to
give excellent stability during operation. In
the standard collection of actuators and ac-
cessories there are several types to choose
from and regardless of what was originally
supplied with the valve, any exchange of
actuator and/or accessories can easily be
performed on site.
For more information contact Fred Venter, on
tel: +27 11 397 2833, email:
or go to
Stafsjö expands range with the new high pressure slurry valves
FOCUS ON PETROCHEMICALS