Valmet Flowrox SKW DN50-600, Installation Maintenance And Operating Instructions

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4SK70EN - 5/2023
5 Operation
5.1 Commissioning and decommissioning
Before the valve is operated within the pipeline, ensure that
it has been installed in accordance with this manual and
applicable safety regulations.
The following must also be ensured:
• Parameters on the type plate are suitable for the process
and environment
• The valve is used for the purpose specified at the time of
sales
• Required gate guards and other accessories are installed
• Possible explosive conditions have been taken into
account
When a valve is decommissioned, dispose the valve parts and
electric/pneumatic/hydraulic devices (actuators) according to
the local regulations and the instructions given by the part or
device manufacturer. Collect and dispose dangerous process
media, so that people and environment are not endangered.
Follow the local regulations.
5.2 Recycling and disposal
Most valve parts can be recycled. Separate recycling and
disposal instructions are available from the manufacturer. A
valve can also be returned to the manufacturer for recycling
and disposal for a fee.
5.3 Flushing
Follow these operation instructions, when valve flushing is
installed.
Flush Fowrox gate valves at least after every 20 cycles to
keep the body clear of solids, depending on application and
process. If slurry solids are present in the process, the flushing
sequence needs to be initiated each time the valve is operated.
It is important to open the water supply valve a moment
before the valve is operated. The flushing water is then left on
for the entire cycle and for a minimum of 10 seconds after the
cycle. To improve flushing, the water should be left on until
clean flushing water is exhausting through the drain line.
The flushing water pressure must not exceed the maximum
allowable operating pressure of the valve.
6 Maintenance
6.1 General maintenance and checks
WARNING!
Unexpected start-up hazard.
De-energize actuators before maintenance.
Especially pneumatic actuators equipped with a
mechanical spring can cause injury to people and
equipment if cylinder actuates unintentionally.
Crushing hazard.
Keep your hands and feet clear of moving parts.
De-energize actuators before maintenance.
CAUTION!
Depressurize, empty and cool down the valve
before any maintenance work. Valve surface can be
hot. Isolate the valve completely from the process
and follow the factory safety regulations.
Lifting equipment must be used for valves
weighing over 25 kg (55 lbs).
Do not step on a valve installed in horizontal or
angled position.
Only personnel with appropriate training are allowed to
service the valves. For actuator service instructions consult
the manufacturer’s documentation supplied with the valve.
Check the condition of the valve regularly. When the valve
is tight and it actuates flawlessly, lubricating is the only
mandatory maintenance task. Periodic inspections should be
done as valves may wear over time depending on conditions
and process.
6.2 Scheduled maintenance
Include the valves in your factory maintenance program.
Maintenance tasks and service intervals are offered as a
guideline in Maintenance schedule.7. Schedules will vary
with applications.