ARI Armaturen PRESO EN - Manual (Page 7)

Rev. 0040402000 0410 Page 7
Operating and installation instructions
PRESO
®
5.3 Strainer
5.4 Safety valves
6.0 Putting the valve into operation
-
ATTENTION !
A strainer should be installed in a suitable position.
The strainer must be cleaned from time to time.
-
ATTENTION !
The system must be protected against excess pressure. The necessary safety
valve must be dimensioned so that the max. possible massflow can be blown of
by the safety valve.
The set pressure depends on the system part with the lowest pressure burden,
and there must be a sufficiently large gap between set pressure and system
pressure.
If necessary the upstream pressure (P1) and the pressure downstream of the
surplus valve (P2) should be equipped with a safety valve.
ATTENTION !
- Before putting the valve into operation, check material, pressure, temperature
and direction of flow.
- Regional safety instructions must be adhered to.
- Residues in piping and valves (dirt, weld beads, etc.) inevitably lead to leakage.
- Touching the valve when it is operating at high (> 50°C) or low (< 0°C) media
temperatures can cause injury.
Affix warning notice or protective insulation as appropriate!
- Pressure regulating valves don’t have any safety function.
- Always make sure that the pressure regulating valve cannot freeze or become
clogged or blocked (e.g. through heating)
Before putting a new plant into operation or restarting a plant after repairs or
modification, always make sure that:
- All works has been completed!
- The valve is in the correct position for its function.
- Safety devices have been attached.