Modentic GTF-300, Руководство пользователя

Страница: 7 / 10

5
pressure of the actuator is better not to exceed
1.5 times the Maximum torque of the valve.
5.4 Operation
a. For manual operation, shift the handle in
counter-clockwise direction for opening and
clockwise for close.
b.
If the handle is in parallel position with the
flow direction, the valve is open. If the
handle is in right angle position with the flow
direction, the valve is close.
c.
When installing actuator, the user should
ensure the position of the valve whether
open or close. The rectangular shape of the
stem top or the direction mark at the stem
top is in parallel with the flow direction
means the valve is opened.
6. Put into service
a. After install to the pipeline, it is necessary to
check the function of the product. Thus,
operate the valve about 3 times to ensure
the function.
b. Systems hydrostatic test
Before delivery, valves are tested 1.5 times
the allowable working pressure at ambient
temperature in open position. After
installation, the pipe line system may
subject to system tests, as condition not to
exceed the maximum working pressure.
c. After pressure testing, user shall operate the
valve again about 3 times to ensure the
function.
7. Dangers of inappropriate use
a. Never uses the product exceed its allowed
condition, 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, operation frequency,
high-pressure 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 movement between stem and
stem packing.
c. Emergency repair
When leakage occurs at the pipe connection
flange, tight the bolts of the flange end caps,
the force must distribute on the every single
bolt evenly. The order to tight the bolts need
to be symmetrically. For long-term purpose, it
is need to be re-installed with new seal.
d. Disassembly
(NOTE If complete disassembly is necessary,
replacement of all seats and seals is recommended.)
(1) To dismantle the valve must follow 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
pipe. It must open the ball a little and let
the fluid come out slowly, it also need to
watch out the poisonous and inflammability
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 hand
wheel from the valve
first than put the valve flange end on the
ground. This procedure is protecting the
surface of the ball.
(4) To dismantle the valve body and end cap,
release retainer with a special tool. It
must be careful to dismantle the ball to