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Hyper-Cryogenic Emergency Shut-off Valve
Manual Operated Valve for Hyper-cryogenic
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Hyper-Cryogenic Valve
Since 1984, HAITIMA has been making efforts to push forward
domestic manufacturing of ultraslow temperature vessels with |
nitrogen as a key ingredient. In response to this domestic
manufacturing effort, we have also started to develop related
valves. |
In this area, we are a pioneer. With high growth during
post-economy era, the industrial use of nitrogen, the use of natural
gas, |
refrigeration industries related with this heat use of: liquid
nitrogen, liquid carbon dioxide, etc., related industries of low |
temperature also grew smoothly, in particular, development in
the use of nitrogen in semiconductors and in the electronic |
industry, etc. During the past 20 years, we have been supplying
ultra-low temperature valves. Regarding quality management, |
we demand high safety, material inspection (material
analysis, tension check, and low temperature spot-check), non- |
destructive tests (radiation check, liquid penetration
non-destructive test, ultrasonic non-destructive test) sub-zero
environ- |
ment, various pressure checks, low temperature check, and
oil-free treatment & inspection. In addition, we have a powerful |
technical team. For many years, we have been making great
contributions to technological innovation. |
The advantages of the design and structure
• Lightweight and small sized valve housing ---- To reduce
heat loss of the valve housing, the lightweight and small sized
valve |
housing for ultraslow temperature application was
specially designed. The welding method of the handle portion is the
most |
suitable processing method. |
• Long bonnet of proper length ---- If the temperature of
the ground portion is below the dew point, it is prone to coagulate |
with the moisture in the air, causing difficulty in
operation. If the temperature is too low the glue loses some of its
effective- |
ness in sealing, which can cause leakage.
Consequently, to prevent the heat of the liquid from directly
causing this, the long |
bonnet was specially designed. This length is the
most suitable length design based on the tests and previous
performance. |
• Ideal valve seat (Soft touch) ---- The SW or BW valve
housings use soft touch valve seats so that the piping cannot be
taken out |
easily and the valve seat and valve housing may not
be damaged. Disc sealing is using low temperature characteristics
that |
can stabilize 15% of Glass, Teflon and 3FPCTFE,
which can be exchanged when necessary. (Metal touch) ---- Liquefied
gas lacks |
lubricity. Using Austenite Stainless as the
material,alve housing is designed. The valve seat is molded with the
valve body as |
a whole. The bearing surface uses Stellite metal
which largely increases the life. |
• The structure that prevents regasification pressure rise
The body of globe valve uses the flexible type that can be fully
sealed. |
But now if the liquefied gas inside the valve
housing is sealed absorbing heat from the outside, it may result in
regasification |
and cause a pressure rise as the temperature rises.
To avoid this, the structure of the relief hole was designed on the
upper |
flow measurement. |
• Durable GLAND packing U-Ring molded with durable Teflon
can be operated. Light and handy and be used semi- |
permanently. When necessary, it may be made
corresponding to various combinations of Packaging. |
• Gaskets with good low temperature characteristics Gasket
is made of GYLON. It has small shrinkage, good compression restor- |
ing features and stable low temperature
characteristic (-210~260°C). When necessary, it can be °C |
• Handling acid gasoline Ultraslow temperature valves are
handled using oil-free Trichloroethane when being assembled, |
which can be used with case. |
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