wT 2858/02
Page 20
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The retaining washer negates movement of the sealing ring in radial direction (1), against
the rear (2) and against the bore (3). The ball presses against the sealing ring (4). The
sealing ring can therefore neither set nor shift, as it is enclosed on all sides (applies to
retaining washer).
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Installation and Putting into Service Regulations
In order to protect against impurities and damage, the connections of the valves are
covered. We recommend removal of these covers only prior to installation.
Ballostar® ball valves can be installed in every orientation. Installation should be carried
out in the OPEN position (delivery state) in order to avoid damage to the ball surface.
Valves with welding ends may generally be welded into a pipework by means of fusing
welding procedures. In this context, the welding and quality requirements and their norms
are to be complied with. As a consequence, welding may only be carried out by qualified
personnel. The safety regulations of the plant operator and/or the plant manufacturer are
also to be complied with.
The installation of valves with flange ends may only be carried out by qualified personnel
in accordance with EN 1591. In this context it must be ensured that no additional tensions
affect the valve, such as e.g. a too large gap between the to be screwed flanges.
Following installation and prior to putting into service, it must be ensured that solids and
impurities, which are not part of the medium, have been removed from the pipeline
system and/or from the facility.
A pressure and a function test must be carried out prior to putting into operation. Prior to
putting into service of valves in steam pipes, proper condensate draining must be ensured
in order to avoid steam hammer hazards. In extreme cases, a steam hammer may lead
to breaking of the valve. Rapid increases in temperature and pressure are to be avoided
during all operation phases (start – operation – shutting down).
The maximum permissible test pressure is 1.1 x PN if the valve is in a closed state. The
valve must be open when testing the pipe pressure (1.5 x PN).
The ball valves are also to be secured against toppling or falling down during
transportation to the place of installation. Furthermore, they are to be protected against
colliding with each other or other forms of damage.
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