Safety; Proper Use; Improper Use - Leser 330 Instructions De Service

Safety

Proper use

2 Safety
2.1 Proper use
Change-over Valves allow for the continuous operation of pressurised systems.
For this purpose, two safety valves are connected through a Change-over
Valve to a pressurised system. Such an arrangement allows for interruption-
free operation of the system, as one safety valve is in operation and the other
serves as a standby safety valve. The standby safety valve can be dissembled
and serviced while the plant is in operation.
Each Change-over Valve type is designed for a specific pressure and tempera-
ture range and specific media classes (vapours, gases, fluids).
The maximum permissible operating limits are determined by the following
factors:
– the material of the Change-over Valve,
– the operating temperature,
– the operating pressure,
– the medium,
– the flange rating classes.
To determine whether a specific Change-over Valve is approved for the
intended purpose, check the approval documentation.
Depending on the system design, there might be temperature and pressure
limits for specific media.
2.2

Improper use

Change-over Valves must not be used improperly.
Any modification to the Change-over Valve is deemed improper, as it might
affect the function and the performance of the Change-over Valve.
Such modifications also include the application of a protective coating to mov-
ing and functional parts.
The operation of the Change-over Valve at pressures that are outside the
allowable range is prohibited.
The Change-over Valve must not be blocked. Blocking the handwheel using
the optional locking device is permitted. Before changing over, release the
locking device.
Do not use the actuator assembly of the Change-over Valve as a hanger for
other objects.
EN
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