ARI Armaturen PRESO EN - Manual (Page 6)

Page 6 Rev. 0040402000 0410
Operating and installation instructions
PRESO
®
5.0 Installation
5.1 General notes on installation
The following points should be taken into account besides the general principles governing
installation work:
- 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.
- Clean and flush the plant before it is put into operation as dirty media can cause damage
to disc and seat.
- Centre gaskets between the flanges.
- The pressure regulating valves shall be installed with upright bonnet.
5.2 Requirements at the place of installation
The place of installation should be easily accessible and provide ample space for
maintenance and removing the cap. Stopvalves should be installed before and after the
pressure regulating valve to enable maintenance working without draining the piping
system. With the installation of a bypass line the system can run on manually.
Install manometers to control the up- and downstream pressures.
When isolating the system the cap must stay free.
ATTENTION !
- Remove flange covers if present.
- The interior of valve and pipeline must be free from foreign particles.
- Note installation position with reference to flow, see mark on valve.
- Steam line systems should be designed to prevent water accumulation.
- Lay pipelines so that damaging transverse, bending and torsional forces are
avoided.
- Protect valves from dirt during construction work.
- Connection flanges must mate exactly.
- Connecting bolts for pipe flanges should be mounted preferably from the
counter flange side (hexagon nuts from the valve side).
At DN15-32: If valves should be mounted directly to valves, the upper flange
connecting bolts should be preferably executed with studs and hexagon nuts on
both sides.
- Valve mountings such as actuators, handwheels, hoods must not be used to
take external forces, e.g. they are not designed for use as climbing aids, or as
connecting points for lifting gear.
- Suitable materials handling and lifting equipment should be used.
See catalog sheet for weights.
- Freezing, sticking or blocking of the surplus valve must be avoided at all costs
(e.g. by heating).
- Before adjusting, remove the cap carefully.
Media could emerge which has accumulated (only with broken bellow!)
- Pressure regulating valves don’t have any safety function.