Dangers Of Inappropriate Use; Maintenance - Modentic HPV-40AT User Manual

operate the valve about 3 times to ensure
the function.
b. S ystems hydrostatic test
Before delivery, valves are tested 1.5 times
the allowable working pressure at ambient
temperature in
installation, the pipe line system may
subject to system tests, as condition not
exceed the maximum working pressure.
c. A fter pressure testing, user shall operate the
valve aga in about 3 times to ensure the
function.
7.

Dangers of inappropriate use

a. Never uses the product exceed its allowed
condit ion, such as pressure, temperature and
fluid.
b. If the product has any inappropriate use, the
product was damage however there are no
signals occurs immediately. User shall
change the product to avoid danger in the
future.
8.

Maintenance

a. Maintenance frequency
The maintenance frequency is determined
upon the application. User shall consider the
time interval depend on the kinds of fluid,
flow velocity,
high-pressu re effect and high-temperature
effect etc.
b. Adjustment of the Gland
Tighten the gland nut about ¼ turn
periodically to compensate for the wear
caused by mov ement between stem and
stem packing.
c. Disass em bly
(NOTE If complete
replacement of all seats and seals is recommended.)
(1) To dismantle the
procedure below.
(2) It doesn't matter where the position of
valve located is; usually it contained the
seal up fluid, so operator must be very
carefully when moving the valve on the
open position. After
to
operation frequency,
disassembly is necessa ry,
valve must follow the
pipe. It must open the ball a little and let
the fluid come out slowly, it also need to
watch out the poisonous
objects if there is any.
(3) It must turn the ball in the close position
before dismantle the valve. The ball cannot
be taken out from valve body if the ball is in
the open or semi-open position. The right
position for store the valve is put the flange
end on the ground. If it is a valve with the
hand wheel, than it must dismantle the
wheel from the valve
hand
the valve flange end on the ground. This
proce dure is protecting the surface of the
ball.
(4) To dismantle the valve body and end cap,
release retainer with a special tool.
must be careful to dismantle the ball to
avoid the seat retainer fall down from end
cap.
(5) To lift the ball by hoist, it must make the
protection on corner to avoi
damaged by metal contacted.
d . Parts inspect ion, maintenance, and
replacement:
(1 ) Check the surface of ball if it is scraped
use the PT for inspection if necessary.
there is any damage on the surface, then find
out the root cause such as the dirt fluid...etc.
avoid the damage factors as far as possible as
we can .
(2 ) The damage of the ball surface, to gauge if it
is locate on the contacting area of ball and ball
and inflammability
first than put
It
d the ball
If
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