CSA air valve Mod. SCF
5
Installation
The water combination air valve should always be installed in a vertical position, a maximum of 4°
tilt is allowed. An isolation valve between this unit and the transmission (pipeline) system is
necessary to allow maintenance and valve’s inspection. Where to use:
High points in pipelines where the hydraulic gradient and flow conditions are such that a
negative pressure can possibly occur.
Change in slope descending and ascending
Adjacent to any sectioning valve in a pipeline such as a check or gate valve where vacuum
can occur upon closure.
This air valve is not to be installed near pump, where different models part of CSA range
namely anti-hammer air valves has to be used.
Note to Engineer:
If installed inside a pump house, use threaded or flanged connections
and pipe back into the well or to outside. This will greatly muffle the high
noise level caused by the air being discharged and provide for drainage
of any small amount of water or water vapour that may accumulate. Same
thing applies in case of possible flood events to the installation chamber
to avoid the entrance of liquid back into the main line.
Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from
the pipeline.
Prepare pipe ends and install valves in accordance with the pipe manufacturer’s instructions
for the joint used.
Tighten the flange bolts or studs in a crisscross pattern and minimum of four stages.
Due to the high capacity in terms of flow rate of SCF possible and unexpected rapid filling
and transient events may cause the liquid to reach high levels inside the air valve, before
stabilizing to the safety required value. Should that happen possible residuals and dirt may
remain trapped on top and the air valve must be cleaned to avoid potential leakages.
If the system is not protected by surge tanks and exposed to rapid filling events CSA anti
hammer SCF RFP type and / or SCF AS anti shock are advised
Besides transients the tolerance of suspended solids, possible fibres, grease balls must be
consistent with the air valve DN where special version with increased spacing between float
and body are available.
