Australian Water Management Review Vol. 1 2014 | Page 25

the full flow capacity. The first cage directs and
contains the cavitation recovery, allowing it to
dissipate harmlessly, while the second cage allows
further control to a level as low as atmospheric
pressure downstream. The cages are individually
engineered by entering the data into proprietary
software which calculates the size and placement
of the orifices on both inlet and outlet cages. The
valve bodies are specifically designed to fit a larger
cage allowing higher Cv values (increased flow)
while also allowing for reasonable space between
the anti-cavitation trim and the body wall. This
separation allows for consistent uniform entry
around the cage area ensuring the vapour bubbles
collapse symmetrically towards the center of the
anti-cavitation cage. Extreme pressure drops, even
to atmosphere and up to 21Bar head loss across the
valve will still not allow cavitation to occur.
The DN750 main inlet valve and DN250 bypass
valve were replaced with a single DN600 electronic
dual solenoid control valve, with custom engineered
– Anti Cavitation Trim. CVC already had Singer
valves in other parts of the distribution network,
so were familiar with their reliability and use of
quality materials that give them a long life. Part of
this assurance is warranty that covers the operation
of the AC Trim for the life of the valve when used
within the specified operati