Operation; Instructions For Operation - Leser 330 Instructions De Service

Operation

Instructions for operation

8 Operation
CAUTION
Incorrectly closed Change-over Valve
If a Change-over Valve is not closed correctly, the performance of the safety
valves is impaired.
– During operation, do not move the disc of the Change-over Valve to the
centre position.
8.1 Instructions for operation
If a safety valve is to be dismantled, switch over the Change-over Valve. As a
result, the system side that contains the safety valve is isolated. To switch the
Change-over Valve, you might need to lower the operating pressure, until
manual switching is possible.
Alternatively, install a pressure equalisation device that connects the elbows
and facilitates manual switching. The pressure must be equalised slowly to
prevent sudden pressure changes. When using a pressure equalisation device
in systems with high operating pressure, ensure that the device is properly
installed (to avoid redundancy). It may be necessary to repeatedly switch the
shut-off fitting at the pressure equalisation devices.
When disassembling the safety valve, always check the drain, flashing and
pressure gauge connections, the shut-off valves and other components of the
Change-over Valve for damage.
To test the Change-over Valve function when removing one of the safety
valves, switch the Change-over Valve (see chapter „8.2 Wechselventil
umschalten" auf Seite 25).
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