ARI Armaturen PREDU 700 EN - Manual (Page 9)

Rev. 0040701000 1714 Page 2-9
Operating and installation instructions
PREDU
®
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.
- Before installing the pressure reducing valve rinse and clean the system otherwise the
seat / disc will be damaged and the control hole will be blocked.
- Centre packings between the flanges.
- Keep the bonnet thread free from paint.
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 data sheet for weights.
- For operating temperatures above the allowable actuator temperatures (refer to
point 4.4 and 6.0) a water seal pot must be installed full of water, for steam use
(refer to point 5.4).
- When using a water seal pot the valve must be installed vertically downwards
with the spring actuator below the pipe work. Otherwise the valve can be
installed upright. The pressure reducing valve is only allowed to be installed in
horizontal pipework.
- In case of a damaged diaphragm dangerous media (hot condensate, steam
etc.) can escape out of the vent hole (screw plug), so connect with a pipe to a
safe place.