Series RSS/F
Page
14
9560-010-en
Revision 19
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 1.3
.
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, retighten all connection screws
after the initial loading of the valve with operating
pressure and operating temperature.
For tightening torques, see
Section 1.3
.
7.2 Improper operation and their
consequences
♦
Crystallisation must be prevented, e.g. by heating.
In extreme cases this may cause blocking.
♦
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.
♦
If no monitoring is provided by the warning
connection, do not tighten safety stuffing box.
Otherwise any leak cannot be seen.
♦
The valve is not to be operated in the wrong
direction of flow. Otherwise, it may close uninten-
tionally with an actuator of normal dimensions.
7.3 Shutdown
The local regulations are to be observed
when dismantling the valve.
Make sure that a remote-controlled actuator
cannot be switched on by accident.
In the case of a diaphragm actuator make sure that
there is no more compressed air in the actuator; the
springs must be in the unstressed state.
Before undoing the pipe or cover flange bolts, ensure
that the plant is depressurised on both sides of the
valve.
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. Drain
the valve on both sides.
After dismantling, immediately protect the valve
flanges against mechanical damage by using flange
caps. See also
Section 6.1
.
