Duraflex Expansion Tanks and Pressure Maintaining Stations
Performing several important functions; Expansion tanks:
eliminate the exposure of system expansion water to oxygen.
prevent negative pressure at the highest points of the system, avoiding the intake of air into the network.
avoid the evaporation of the system liquid.
avoid cavitation inside pumps and fittings.
keep liquid in reserve, in order to avoid a pressure drop caused by occasional losses of volume such as deaeration at system start-up.
compensate for variations of volume due to temperature changes.
Duraflex Back Flow Preventors and Automatic Refill Units are “Breaktank” Devices which combine Back-Flow Prevention with automatic refilling of systems as required by AS3500 National Plumbing and Drainage Code.
Duraflex Back Flow Preventers & Refill Units consist of a non-corrosive supply tank, fill valve, pressure pump and pressure switch.