ARI Armaturen STOBU PN 40 EN - Manual (Page 6)

Page 2-6 Rev. 0040102000 1113
Operating and installation instructions
STOBU
®
PN16-40
- Planners / construction companies or operators are responsible for positioning and
installing products.
- The valves are designed for application, not influenced from weather.
- For application outside or in adverse environments like corrosion-promoting conditions
(sea water, chemical vapours, etc.), special constructions or protective measures are
recommended.
5.2 Installing valves with butt weld ends
Please note that only qualified persons using appropriate equipment and working in
accordance with technical rules are allowed to install fittings by welding.
The responsibility for this lies with the system owner.
Refer to the data sheet for information about the shape of the butt weld ends.
The valves must be welded in closed position.
- Valves can be installed with the spindle pointing in any direction, but the
prefered spindle position is vertical.
- Valves should be installed upside down only, if the medium being handled is
clean.
- Keep the thread and shaft of the spindle free from paint.
- Centre gaskets between the flanges.
- Lockable stop valves must be installed in such a way that the spindle is vertical
and the flow agent enters under the taper. If the valves are installed in pipelines
in positions other than specified, they must be fitted with a closing spring.
- Design with loose plug
A plug damper should be used in critical applications, immediately downstream
of pumps, compressors, etc., where severe turbulence and pulsating pressure
surges may occur.
Through the damper function of the loose plug, the negative influence of
pressure shocks and high turbulences, are not transferred onto the valve.