The Model XLC 321/421, installed in derivation
from the main line, will act as a protection of the
system against the devastating effects of water
hammer caused by pump failure. Thanks to a
circuit composed of two pilots, hydraulic
accelerators and exclusive flow control stabilizer,
the valve will serve both as a pressure relief, in
case of rise of pressure, and as an anticipator of
water hammer in case of pump failure providing the
valve with a response time almost instantaneous.
For the proper sizing and water hammer
analysis please contact us.
Working conditions
Fluid: treated water.
Minimum operating pressure: 1,5 bar.
Maximum operating pressure: 25 bar.
Maximum temperature: 70°C.

Applications
At the pumping stations, downstream of
pumps check valves in derivation from the
main line.
The valve is usually associated to anti-surge
combination air valves FOX 3F AS and other
products chosen by the water hammer
analysis.