7. Commissioning/Decommissioning
7.1. Commissioning
7.1.1. General
Prior to commissioning the valve, the pressure, temperature
and material data stated on the valve should be compared to the
actual operating conditions in the piping system to check whether
the valve can withstand the loads occurring in the system.
Possible
pressure
surges
(water
hammer)
must
not
be
exceed
the highest admissible pressure. Adequate precautions should be
taken. In new pipe systems and especially after repair work, the
system should be flushed with the valves fully open to remove
solids, e.g. weld beads, which may damage the seats.
7.1.2. Operation
The
position
of the disc is
indicated
by the
pointer
of the
actuator
or
by handle lever. The valves are closed by turning in the clockwise
direction (top view) and opened in the counterclockwise direction.
7.1.3. Functional Check
The following functions should be checked before commissioning,
the shut-off-function of the valves should be checked by repeated
opening and closing.
7.1.4. Actuated valves
Adjustable end stops and torque limiter of actuators have been
adjusted in factory.
7.2. Decommissioning
During extended shutdown periods, liquids liable to change their
condition
due
to
polymerization,
crystallization,
solidification
etc.
must be drained from the piping system. If necessary, the piping
system should be flushed with the valves fully open.
8. Maintenance/Repair
8.1. Safety Instructions
Maintenance and repair work may only be carried out by skilled
and qualified personnel.
For all maintenance and repair work, the safety instructions listed
below and also the general notes in section 2 must be observed.
Always use suitable spare parts and tools, even in case of
emergency, otherwise correct operation of the valves cannot be
assured.
8.2. Valve removal from piping and
actuator disconnecting
Identify the valve by identity plate.
Please check what is the relevant spare kit. Place the disc
in closing position
The entire valve must be unpressurized and must have
cooled down sufficiently so that the temperature of the medium is
lower than 60 ° C, to prevent scalding or warmed so that the
temperature is higher than 0 ° C.
Opening pressurized valves will cause danger to life and
limb! lf toxic or highly flammable substances or liquids whose
residues may cause corrosion by interaction with the air humidity
were handled by the valve, then the valve should be drained and
flushed or vented. lf necessary, wear safety clothing and a face
guard/mask. Depending on the installation position, any liquid
remaining in the valve may have to be removed.
Prior to possible transport, the valves must be flushed and drained
carefully. lf you have any questions please contact your KSB
Sales Office.
lf actuators powered by an external source of energy
(electric, pneumatic, hydraulic) need to be removed from the
valves or dismantled, the energy supply must be shut down prior
to starting any repair work.
Remove the valve from the piping with its actuator. Identify
the mounting position of the actuator
Disconnect the actuator and take care of all bolting parts.
8.3. Spares
Use the relevant spare parts included in the kits. Please refer to
the manual maintenance.
All constitutive parts of kit and flange gaskets must be replaced.
During the mounting /dismantling of the valve, the
operations must be respected step by step to prevent injuries and
material damages.
During the tests, closing and opening valves, care must be taken
that no operator interferes with the disc travel.
8.4. Valve disassembly and
re