Series KA-N/F, KAP-N/F
Page
10
9520-017-en
Revision 15
TM 10477
Edition 05/2022
7
Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
air or water. Prior to initial operation check cover
screws. For tightening torques, see
Section 1.2
.
Unless otherwise agreed there could be
residual amounts of water in the flow section
of the valve. This could result in a possible
reaction with the medium.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature. For
tightening torques, see
Section 1.2
.
7.2 Improper operation and their
consequences
♦
The ball valve is an on/off valve and shall not be
operated in an intermediate position.
Damage to the seat rings or the ball/stem or
ball/stem unit could occur.
♦
Crystallisation may result in damage to the seat
rings or the ball/stem or ball/stem unit. This can
be prevented by heating. In extreme cases this
may cause blocking.
♦
If the ball blocks, do not apply force as the
ball/stem or ball/stem unit may break if the max.
adm. torque is exceeded.
♦
Increased wear occurs in operation with solids
contents.
♦
Operation during cavitation leads to increased
wear.
♦
Non-observance of the pressure-temperature
diagram can lead to damage.
♦
Do not subject the lever to heavy loads; the lever
or ball valve may be damaged.
♦
Do not use a lever extension as otherwise there is
a risk of damage.
7.3 Shutdown
The local regulations are to be observed when
dismantling the valve.
Prior to undoing the flange connection ensure, that the
plant is depressurised and emptied.
Prior to starting any repair work, the valve is
to be thoroughly cleaned. Medium residue
may be in the valve even if it has been
properly drained and flushed.
After dismantling, immediately protect the valve
flanges against mechanical damage by using flange
caps. See also
Section 5.1
.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.
