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 valves are closed by turning the handwheel in the
clockwise direction (top view) and opened in the counter
clockwise direction.
Using additional levers when turning the
handwheel is not admissible, because excess
force may damage the valve.
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.
The gland packing (461) should be checked when it is
subjected to the full operating pressure and temperature for
the first time. If necessary, retighten the nuts (920) at the
gland flange (452) evenly.
The cover flange connection (901) and the gasket (411)
should be checked for tightness after the first temperature
rise at the valves. In case of leakage at the gasket (411), the
connection should be tightened crosswise, evenly and in a
clockwise direction.
Open the gate and globe valve by one or two
turns of the handwheel prior to retightening the
nuts 920 to prevent jamming of the seat.
Retightening of the nuts (901) of the cover bolting especially
applies to valves used in heat transfer systems to DIN 4754.
7.1.4 Actuated valves
On valves with electric/pneumatic/hydraulic actuator, the
strokes/forces must be limited.
Electric actuators should be wired as follows:
Always use suitable spare parts and tools, even in
emergencies, because otherwise correct operation of the
valves cannot be assured.
Switches are factory set. Do not tamper with
settings. To readjust settings refer instruction
manual of actuator manufacturer and / or contact your
nearest KSB office.
For setting of actuator, please refer instruction manual which
will be kept in the wiring side compartment/cover of actuator.
7.2
Decommissioning
During extended shutdowns 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 3 must be
observed.
Always use suitable spare parts and tools, even in
emergencies, because otherwise correct operation of the
valves can not be assured.
8.1.1 Dismantling of valves
Before removing the complete valve from the pipe, or before
repair or maintenance work on the valve itself, i.e.
- before removing cover or bonnet from the body
- before removing the gland flange and gland bush to replace
packing rings
- before removing an actuator bolted directly to the yoke
head
The entire valve must be unpressurized and must
have cooled down sufficiently so that the
temperature of the medium in all the valve’s chambers is
lower than the vaporization point of the medium, to prevent
scalding.
Opening pressurized valves will cause danger to
life and limb!
If toxic or highly inflammable 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.
If necessary, wear safety clothing and a face guard/mask.
Caution
Caution
Caution
