Modentic 3PC, User Manual

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1. General Precautions
a. Operation:
Ball valve is a kind of isolating valve used in
a pipe line system, which intended for use
only in the closed or fully open position. In
the open position, it allows the flow passes
through.
b. Material Selection:
The possibility of material deterioration in
service and the need for periodic inspections
is depended on the contained fluid. Carbide
phase conversions to graphite, oxidation of
ferrite materials will decrease in ductility of
carbon steels at low temperature are among
those items. However information about
corrosion data is provided together with this
user manual, the user is requested to take
attention or consideration to determine the
suitability of material in their application.
c. Pressure-Temperature rating:
The Pressure-Temperature rating is
considered for static pressure. Please refer
to P & T rating section 3 for actual
application. The allowable temperature is
between
-20°C and 180°C. Do not exceed
the temperature range to avoid danger.
d. Fluid thermal expansion:
It is possible, when the ball valve is in closed
condition, the sealed cavity within the valve
body to be filled with liquid. If this liquid is not
released, by partially opening the valve or
some other means, and it is subject to a
temperature increase, excessive pressure
sufficient to cause pressure boundary failure
can be occurred. However our products
have pressure self-relief seat to prevent
pressure built up, user is recommended to
prevent that the pressure in the valve will not
exceed that allowed pressure, by means of
piping design, installation, or operation
procedure.
e. Electro Static effect:
The ball valves are designed with electrical
continuity for ball-stem-body to prevent
electro static discharge. The user is
responsible for ensuring the earthing of the
pipeline system.
f. Fire safe condition:
Fire safe certificates are only available upon
request.
g. Liquids with high fluid velocity:
The ball valves might be operated frequently
with very high velocity liquids, a check shall
be made with the valve distributor or
manufacturer for appropriate advice to
minimize the possibility of seat deformation,
especially when they are highly pressurized
on high-temperature line.
h. Throttling service:
Ball valves are generally not recommended
for throttling service, where both the fluid flow
and the leading edge of the ball can damage
or deform the resilient ball seats causing
leakage. High fluid velocity or the presence of
solid particles in suspension will further
reduce seat life in throttling applications.
i. Do not open the bonnet or cap when bearing
pressure. Valve is not equipped with pressure
access device. User should check it by other
method through its piping system.
j. Do not touch the surface of valve at high
temperature condition.
k. Not allowed for unstable fluid, otherwise
specified with PED catogory III in Declaration
of conformity or/and in this user manual.
l. Lock design on the handle to avoid the valve
by un-intended operated by un-authorized
person.
m. Use in potential explosive atmosphere safely,
see section 10 for detail.
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