15
7.5.
Actuated valves
Electrical cables may only be connected by qualified
personnel.
The applicable electrical regulations (e.g. IEC and national
standards), also for equipment in hazardous locations, must be
observed.All electrical equipment such as actuator, switchboard,
magnetic valve drive, limit switch etc. must be installed in floodproof
dry locations.Voltage and frequency must match the valves stated on
the identity plate.
Actuator bumpers are adjust in KSB factory. Do not modify
the adjusting to preserve gasket and to keep the good performances.
Cryogenic type BW: special device like “bracket” used for the
positioning of pipe and buttweld ends of valve will be in austenitic
stainless steel and the spot welding will be as light as possible and
made with suitable material filler metal and the lowest acceptable
energy. The welding spot will be eliminated by flush grinding.
The seat (144) and the disc edge shall be protected against the
metallic projections resulting from welding or grinding.
During welding on site, the temperature of the body shell will
be lower than 150
°
C at a distance of 100 mm from the buttweld end.
8.
Commissioning/Decommissioning
8.1.
Commissioning
8.1.1.
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.
8.1.2.
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.
8.1.3.
Functional Chec
k
The following functions should be checked:Before commissioning,
the shut-off-function of the valves should be checked by repeated
opening and closing.
8.1.4.
Actuated valves
Adjustable end stops and torque limiter are pre--adjusted in factory.
The customer may have to complete the adjustment on site during the
commissioning, if necessary.
8.2.
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.
9.
Maintenance/Repair
9.1.
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 3 must be observed.
Always use suitable spare parts and tools, even in case of emergency,
otherwise correct operation of the valves cannot be assured.
9.2.
Removal of draining screw (optional)
For valves equipped with optional draining screw into the bottom,
please consult the manual of maintenance of the valve range (listed in
the chapter 9.5) before any operation.
All components are specific, so after valve draining, it is mandatory to
use the same special screw and only spare parts provided by KSB
(like described in the manual of maintenance).
9.3.
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
.
Before reassembling the actuator, please apply the sealant joint
(Type LOXEAL 58--31) between the butterfly valve and the
actuator.
9.4.
Spares
Use the relevant spare parts included in the kits. Please refer to
leaflets.
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 as defined in section 9.4 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.
