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requirement cannot be met, adequately support the actuator
on site or consult the manufacturer.
Electrical connection shall be effected by suitably
trained personnel only
6.5 Insulation
If the valve is to be insulated. make sure that the insulation
does not impair the function of the valve. KSB recommends
to make sure that the sealing areas at the cover/bonnet joints
and at the stem passage (gland packing) are easily
accessible and visible.
7 Commissioning / start-up /shut down
(Please also refer to section 6 installation)
7.1 Commissioning / start-up
7.1.1 General
Prior to commissioning /start-up compare the material,
pressure and temperature data on the valves with the
operating conditions of the piping to check the material
’s
chemical resistance and stability under load.
Surge pressure (water hammer), which might occur, must
not exceed the max. permissible pressure. Safety measures
are requirement to be taken.
In new systems and particularly after repair, the complete
piping system must be thoroughly flushed with the valve fully
opened so that particles and /or welding beads that might
damage the seat/disc interface are removed.
If the piling system is cleaned by means of a pickling
procedure, responsibility for the compatibility of the pickling
media used and the pickling procedure itself lies with the
pickling company.
Venting the valve by undoing the bonnet/cover bolting or
removing gland packing is dangerous and therefore not
permitted.
To prevent damage to the valve material or joint seals, the
usual start-up and shutdown velocities must be adhered to.
7.1.2 Valve actuation
The valves are closed by turning the hand wheel in clockwise
direction and opened by turning it in counter-clockwise
direction (top view); Direction symbols are found on the top
of the hand wheel.
Valves with hand wheels may only be
actuated by hand, As the valve can be
damaged by applying excessive forces, it is not allowed to
use additional levers to move the hand wheel.
Shut-off valves are normally used in such a way that they are
either fully open or fully closed.
For control functions in continuous operation, throttling plugs
should be fitted.
Performing throttling operations without a
throttling plug may result in an excessive
noise level, excessive wear or even destruction of the valve
by cavitation.
7.1.3 Functional test
KSB recommends checking the following functions:
Check the shut-off function of the installed valves prior to
commissioning /start up by opening and closing them several
times.
Check the gland packing for leakage when it is subjected to
full operating pressure and temperature for the first time.
Re-tighten the nuts at the gland follower evenly. if necessary.
The bonnet/cover bolting with the joint ring shall be gradually
tightened crosswise, evenly and in clockwise direction after
the first loading or heating up of the valves and in the event
of leakage at the joint ring. For tightening torques please
contact the manufacturer, if necessary.
Open the valve by two full hand wheel turns
before re-tightening nuts, to prevent jamming
of the seat.
Re-tightening the nuts of the bonnet/cover bolting is
particularly important for valves installed in heat transfer
systems to DIN 4754
7.1.4 Valves with actuator
On valves with electric, pneumatic or hydraulic actuators, the
strokes and actuating forces must be limited
Electrical actuators are factory-set ready for operation. They
shall be wired as follows:
Globe valve
“CLOSE” torque-dependent
Globe valve
“OPEN” travel-dependent
The wiring diagrams are given in the terminal boxes.
For pneumatic and hydraulic actuators, the control pressures
specified in the order shall be complied with.
Non-observance may damage the actuator.
Caution
Caution
Caution
