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PRESCRIPTION BEFORE INSTALLATION
The device consists of a valve with a mechanical seismic actuator, with automatic intervention, with manual reset,
which can be installed, depending on the project, in a vertical or horizontal position. In its normal working position,
the valve is armed in the open position and closes automatically by releasing the shutter when the mechanical
seismic actuator detects stresses like those indicated in the Axes 25-16 technical standard.
The SV valve is designed for installation upstream of the gas system that develops inside both civil and industrial
buildings or near the regulation and measurement units to protect them or, in any case, to protect the section of the
plant, utilities or equipment located downstream of the SV seismic valve in the case of seismic events or catastrophic
damage that can stress the valve like the magnitude of an earthquake (accidental violent shocks, landslides, violent
floods, etc.).
Before proceeding with the assembly, it must be ensured that the SV seismic valve to be installed is suitable for the
place in which it will be used both for the presence of an area classified as dangerous for explosion and for the
pressure rating of the piping.
The utmost care must be used during loading, unloading, transport and installation operations in order to safeguard
the integrity of all parts of the SV valve.
SV valves must always be used within the standard installation conditions provided by the manufacturer.
For the installation of the SV valve, the environmental conditions must be taken into account to ensure correct
operation over time. The manual reset element of the valve, the bubble viewer that indicates the correct installation
position and the plate should be easily accessible to operators in charge of operation and maintenance.
Any subsidence / settlement of the ground, corrosion and other risks must be taken into account. The components
used for installation must be suitable for the pressures and temperatures that occur under normal operating
conditions as well as for pressures up to the declared Maximum Operating Pressure. For any arrangements inside
buildings, the fire protection names contained in EN 1775 must be respected.
The installation, use and maintenance of the SV valve in a different way from that foreseen by the manufacturer (see
the standard installation conditions and the prescriptions given below) can jeopardize the protection method
adopted due to the risk of explosion (with very serious consequences for safety) and the annulment of the EC
declaration of conformity, thus invalidating the respective responsibilities on the part of the manufacturer.
The same consequence occurs if modifications of any kind are made to the valve or if it is modified or disassembled
having access to the internal parts without authorization or if it is used improperly that does not comply with what is
described in this manual.
However, the possibility of using the SV valve in installation conditions other than those indicated is not excluded,
unless verified by the manufacturer, but in any case it can only take place with the specific written authorization of
the manufacturer.
Requirements for technical staff
Installation and maintenance must be carried out by suitably trained personnel with proven experience and in
compliance with the applicable European directives and local regulations and must be carried out by personnel with
the qualifications required by Italian law for installation and maintenance. of plants and equipment that use
combustible gas.
During these activities, personnel not strictly necessary must be removed and the work space must be appropriately
marked, which must highlight the dangerous conditions, prohibitions, behaviors and safety information in
accordance with current workplace safety regulations.
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