During certain industrial, medical and commercial processes, hazardous liquids are used. These liquids, be they chemical or biological hazards, need to be kept out of the general water supply. To ensure the integrity of this vital utility, Automatic Heating Global supplies two solutions.
Duraflex Back Flow Preventors
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. Duraflex Back Flow Preventers & Refill Units are also suitable for all HIGH HAZARD applications, such as:
Chemically treated closed circuit heating or cooling water systems.
Programmed water supply for kitchen hood wash down cycles.
Continuous water supply systems with potential for cross contamination, e.g. photographic laboratories
Cleaning in Place (CIP) systems such as tube-in-tube heat exchangers in wine and food industries.
Hospitals and Nursing Homes.
When applied to closed circuit applications Duraflex Back Flow Preventors and Refill Units provide for a limited make up water supply. In the event of a major system leak the make up water is regulated, limiting water damage in the building.
Duraflex Back Flow Preventers & Refill Units are designed and manufactured in Australia to comply with AS3500 National Plumbing and Drainage Code.
Reduced Pressure Zone Device protects against backflow by either back-pressure or back-siphonage from a cross-connection between potable water systems and substances in ‘high hazard’ conditions.
RPZ devices consist of two independent check valves, plumbed in series, between them a chamber has its pressure monitored which is kept lower than the pressure of the water supply. A differential pressure relief valve guarantees reduced pressure, excess pressure is automatically discharged to a drain. Test cocks are installed to allow an inspector to verify proper operation of the valve with a differential pressure meter. Two valves (one before and one after the RPZD) are provided to allow for testing and repair.