REDUCED PRESSURE ZONE DEVICES SERIES PRODUCT CODES OPERATION HIGH HAZARD RATING. 15mm - 50mm FEATURES APPLICATION DESCRIPTION

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1 PRODUCT CODES RPZ15DO RPZ20DO RPZ25DO RPZ32DO RPZ40DO RPZ50DO RPZ15 RPZ20 RPZ25 RPZ32 RPZ40 RPZ50 15mm RPZD Device Only 20mm RPZD Device Only 25mm RPZD Device Only 32mm RPZD Device Only 40mm RPZD Device Only 50mm RPZD Device Only 15mm RPZD Complete 20mm RPZD Complete 25mm RPZD Complete 32mm RPZD Complete 40mm RPZD Complete 50mm RPZD Complete 15mm - 50mm FEATURES Maximum protection against back siphonage and back pressure Replaceable seats Internal by-pass passage (no external plumbing). Designed for easy and quick in line maintenance and testing Low head loss Economical for life Corrosion resistant Maximum working pressure of 1200 kpa Operating temperature range of 1 C to 80 C Approved to AS DESCRIPTION The AVG Series Reduced Pressure Zone Backflow Prevention is designed to give maximum protection against backflow caused by either back siphonage or back pressure. It is an economical and durable device that is the easiest on the market to maintain inline. The device comprises two independently acting spring- loaded check valves and a differential relief valve located between the check valves. ln keeping with good design practice, and to minimize the risk of damage, the diaphragm and the by-pass are built into the body of the device. The total variance in pressure across the device is approximately 75 kpa. OPERATION During normal flow conditions, the relief valve is held shut by the supply pressure on the relief valve diaphragm acting through the internal by-pass passage. The two main check valves are held open, supplying water downstream. ln the area between the check valves, called the zone, the pressure is maintained at approximately 49kPa lower than the inlet supply pressure. Should a back siphonage or back pressure condition occur, the second check valve will seal, prohibiting the backflow of water. ln the unlikely event that the second check valve becomes fouled, the pressure in the zone will increase causing the differential relief valve to open to atmosphere. This will ensure that the entire backflow relieves to the drain and no potentially contaminated water enters the upstream potable water supply. APPLICATION The AVG Series RPZD provides maximum protection to the potable water supply from contamination in high hazard applications such as cooling towers, abattoirs and sewage treatment plants. SPECIFICATION STATEMENT AVG Series Reduced Pressure Zone Device shall be installed as per Australian Standards AS , including resilient seated isolation valves and strainer The backflow prevention device shall be manufactured to AS and be annually tested and maintained as required as per AS The valve shall be installed at a minimum height of 300mm from finished ground level. The valve shall be adequately supported with approved supports and clipping as required. 10 Tel: 1800 AVG AUS ( )

2 FLOWCHARTS 15mm - 50mm MATERIALS Body and covers Springs Poppets R.V. Seat Discs R.V. Diaphragm FLV- Stem Fasteners Relief Seats Check Seats Glass-filled Celcon Silicone rubber Nitrile and Nylon Celcon TECHNICAL DATA Threaded inlet and outlet Female BSP Min. working pressure 220kPa Max. working pressure 1200kPa Max. temperature 80 C Tel: 1800 AVG AUS ( ) 11

3 PRODUCT CODES RPZ65FLGDO RPZ80FLGDO RPZ100FLGDO RPZ65FLG RPZ80FLG RPZ100FLG 65mm RPZD Device Only Flanged Table E 80mm RPZD Device Only Flanged Table E 100mm RPZD Device Only Flanged Table E 65mm RPZD Complete Flanged Table E 80mm RPZD Complete Flanged Table E 100mm RPZD Complete Flanged Table E 65mm - 100mm OPERATION During normal flow conditions, the relief valve is held shut by the supply pressure on the relief valve diaphragm acting through the internal by-pass passage. The two main check valves are held open, supplying water downstream. FEATURES Maximum protection against back siphonage and back pressure Replaceable seats Internal by-pass passage (no external plumbing). Designed for easy and quick in line maintenance and testing Low head loss Economical for life Corrosion resistant Maximum working pressure of 1200 kpa Operating temperature range of 1 C to 80 C Approved to AS DESCRIPTION The AVG Series Reduced Pressure Zone Backflow Prevention is designed to give maximum protection against backflow caused by either back siphonage or back pressure. It is an economical and durable device that is the easiest on the market to maintain in-line.the device comprises two independently acting spring loaded check valves and a differential relief valve located between the check valves. ln keeping with good design practice, and to minimize the risk of damage, the diaphragm and the by-pass are built into the body of the device. The total variance in pressure across the device is approximately 75 kpa ln the area between the check valves, called the zone, the pressure is maintained at approximately 49kPa lower than the inlet supply pressure. Should a back siphonage or back pressure condition occur, the second check valve will seal, prohibiting the backflow of water. ln the unlikely event that the second check valve becomes fouled, the pressure in the zone will increase causing the differential relief valve to open to atmosphere. This will ensure that the entire backflow relieves to the drain and no potentially contaminated water enters the upstream potable water supply. APPLICATION The AVG Series RPZD provides maximum protection to the potable water supply from contamination in high hazard applications such as cooling towers, abattoirs and sewage treatment plants. SPECIFICATION STATEMENT AVG Series Reduced Pressure Zone Device shall be installed as per Australian Standards AS , including resilient seated isolation valves and strainer the backflow prevention device shall be manufactured to AS and be annually tested and maintained as required as per AS The valve shall be installed at a minimum height of 300mm from finished ground level. The valve shall be adequately supported with approved supports and clipping as required. 12 Tel: 1800 AVG AUS ( )

4 FLOWCHARTS 65mm - 100mm MATERIALS Body and covers Springs C.V. Seat Discs R.V. Seat Discs R.V. Diaphragm R.V. Body R.V. Stem Fasteners Check Seats External finish Ductile iron EPDM Silicone rubber Nitrile and Nylon Epoxy Coat TECHNICAL DATA Flanged inlet and outlet Table E Min. working pressure 220 kpa Max. working pressure 1200 kpa Max. temperature 60 C Tel: 1800 AVG AUS ( ) 13

5 PRODUCT CODES RPZ150FLGDO 150mm RPZD Device Only Flanged Table E RPZ150FLG 150mm RPZD complete 150mm - 250mm FEATURES Maximum protection against back siphonage and back pressure Replaceable seats Internal by-pass passage (no external plumbing). Designed for easy and quick in line maintenance and testing Low head loss Economical for life Corrosion resistant Maximum working pressure of 1200 kpa Operating temperature range of 1 C to 60 C Approved to AS DESCRIPTION The AVG Series Reduced Pressure Zone Backflow Prevention is designed to give maximum protection against backflow caused by either back siphonage or back pressure. It is an economical and durable device that is the easiest on the market to maintain in-line.the device comprises two independently acting spring- loaded check valves and a differential relief valve located between the check valves. ln keeping with good design practice, and to minimize the risk of damage, the diaphragm and the by-pass are built into the body of the device. The total variance in pressure across the device is approximately 75 kpa OPERATION During normal flow conditions, the relief valve is held shut by the supply pressure on the relief valve diaphragm acting through the internal by-pass passage. The two main check valves are held open, supplying water downstream. ln the area between the check valves, called the zone, the pressure is maintained at approximately 49 kpa lower than the inlet supply pressure. Should a back siphonage or back pressure condition occur, the second check valve will seal, prohibiting the backflow of water. ln the unlikely event that the second check valve becomes fouled, the pressure in the zone will increase causing the differential relief valve to open to atmosphere. This will ensure that the entire backflow relieves to the drain and no potentially contaminated water enters the upstream potable water supply. APPLICATION The AVG Series RPZD provides maximum protection to the potable water supply from contamination in high hazard applications such as cooling towers, abattoirs and sewage treatment plants. SPECIFICATION STATEMENT AVG Series Reduced Pressure Zone Device shall be installed as per Australian Standards AS , including resilient seated isolation valves and strainer The backflow prevention device shall be manufactured to AS and be annually tested and maintained as required as per AS The valve shall be installed at a minimum height of 300mm from finished ground level. The valve shall be adequately supported with approved supports and clipping as required. 14 Tel: 1800 AVG AUS ( )

6 FLOWCHARTS 150mm - 250mm MATERIALS Body and covers Springs C.V. Seat Discs R.V. Seat Discs R.V. Diaphragm R.V. Body R.V. Stem Fasteners Check Seats External finish Ductile iron EPDM Silicone rubber Nitrile and Nylon Epoxy Coat TECHNICAL DATA Flanged inlet and outlet Table E Min. working pressure 220 kpa Max. working pressure 1200 kpa Max. temperature 60 C Tel: 1800 AVG AUS ( ) 15