Steel Ball Valves - Hasmak.com.tr

Technical Features of KITZ HYPATITE ® and SWELLESS ® <strong>Ball</strong> Seats
KITZ HYPATITE ® ball seats are made of denatured PTFE, a molecularly reinforced PTFE / PFA copolymer, and
specifically engineered for high sealing performance and prolonged service life of valves, in place of
conventional glass-filled PTFE seats. The unique performance features are <strong>com</strong>pared with those of conventional
glass-filled or virgin PTFE ball seats below. With the introduction of HYPATITE ® ball seats, glass-filled PTFE version
is no longer available from KITZ Corporation, while carbon-filled or virgin PTFE seats remain available as options.
A newly developed option, KITZ SWELLESS ® ball seats, principally made of PFA are re<strong>com</strong>mended specifically for
monomer service. This epoch-making new seat maximizes resistance to the permeation of monomer into its
molecular structure (generally known as "swelling") which causes seat deformation and seriously affects shut-off
of valves in styrene and butadiene monomer service.
Our HYPATITE ® ball seats also out perform conventional PTFE seats with its monomer resistance feature.
However, it has been verified both by laboratory and on-site tests that SWELLESS ® seats perform much better
than HYPATITE ® seats, as they indeed deserve the name of "SWELLESS", their registered trade name. Also, PFA
resin, the principal material, assures the characteristic of fluorine resin such as execellent resistance characteristics
to high or low temperatures, creep or <strong>com</strong>pression, abrasion and general chemicals.
Table 1 and Figure 1, 2 and 3 here explain these technical features of HYPATITE ® and SWELLESS ® ball seats
<strong>com</strong>pared with conventional seat materials. For <strong>com</strong>pared pressure-temperature ratings, refer to Page 9 and 10.
Table 1. Compared Technical Features of KITZ <strong>Ball</strong> Seats
Compared features
HYPATITE ® or
SWELLESS ® seats
PTFE seats
Glass-filled
PTFE seats
Heat resistance
Good
Good
Sealing performance
Good
Good
Good
Durability (Pitting-resistance)
Good
Fair
Creep and <strong>com</strong>pression resistance
Good
Fair
Chemical resistance*
Good
Good
Abrasion resistance
Good
Good
Good
Firesafe provision
Good
Good
Throttling service
Fair
Fair
Fair
Product contamination
None
None
Valve operating torque
Low
Low
Low
Refer to the above body text for monomer service characteristics of SWELLESS ® seats.
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Technical Information