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2.2 GENERAL INSTRUCTIONS
The valve installation shall be carried out in compliance with the prescriptions (laws or regulations)
in force in the place of installation.
In particular the specifications of natural gas plants shall be in compliance with the law provisions
or regulations in force in the place of installation, or at least in compliance with the EN 12186 or
EN12279 regulations (we remind that the installation in compliance with such laws minimizes the
risk of fire hazard).
The valve shall be installed by making sure that the operating pressure of the unit where it is
installed never exceeds the value of the permissible maximum pressure (PS).
The user shall moreover arrange suitable venting or draining system to discharge the pressure
and fluid inside the plant before carrying out any inspection or maintenance operation.
In case the installation specifications require it, the valve may be sealed with lead after having
been adjusted at the required intervention value; lead seals may be carried out at the factory
directly by the manufacturer or on site by the user.
2.3 SPECIAL INSTRUCTIONS
Before installing the valve it is necessary to be sure that :
- the valve may be inserted in the arranged space and it is sufficiently accessible for the following
maintenance operations, dimensions and weights are reported in table 2;
- the upstream and downstream pipelines are at the same level as the inlet and outlet connections
and they can support the weight of the valve;
- the pipeline inlet/outlet flanges are parallel to the valve seal surfaces;
- the inside of the valve is clean and the valve itself was not damaged during the transport;
- the upstream pipeline was cleaned in order to expel residual impurities such welding slag, sand,
varnish waste, water, etc.
Install the valve considering that the flow direction is compulsory and it is showed with an arrow on
the valve body itself.
The valve may be installed both with vertical flow direction and horizontal flow direction.
For the installation please refer to figures 3 and 4.
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