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Fluids
containing slurries or crystalline substance
cause abrasion on the part of ball,
ball seat and body. It can also cause
troubles in opening and closing of the
valve by taking in fine particles between
the ball and the ball seat. So, refrain
from using the valve to transport slurries-containing
fluids. |
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Should
fluids not stop after closing the valve
or leak from the union nut part, tighten
the union nut evenly on the right and
left side. Tighten it manually or by
using a belt wrench, but never use a
pipe wrench. Excessive tightening makes
opening and closing of the valve harder
and causes breakage. |
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The
valves in sizes 15-50A are equipped
with the ball popping-out preventive
device. If the union nut in the downstream
side is removed keeping the valve installed
in the pipeline, pay attention as fluids
may not stop completely on some occasions. |
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The
valves in sizes 65-100A are not equipped
with the ball popping-out preventive
device. So there is a danger of the
ball popping-out in case of loosening
the union nut when the fluid still remains
in the pipeline.
Therefore, do not fail to take out the
remaining fluid to put the valve under
non-pressure conditions before loosening
it. |
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Tighten
the union nut after fully closing the
valve, because tightening the union
nut under the opening position causes
incomplete stop of fluids by damaging
the ball seat. |
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For
flange connecting bolts, and other notes
in handling, installation
and operation. |
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