Caleffi 575010 DN100 Flanged BA Backflow Preventer Bronze

The 575010 is the DN 100 flanged member of the Caleffi 575 series of controllable reduced pressure zone backflow preventers, BA type. Installed between the mains and an internal water system, it keeps potable water from being contaminated if pressure reverses, by splitting the water into three pressure zones with two check valves and a relief drain between them.

Protecting the potable supply at the main entry

Backflow happens when mains pressure falls below the downstream pressure, for example after a main break or under heavy demand (back siphoning), or when downstream pressure rises, as with water pumped from a well (counter pressure). The datasheet states that a backflow-pollution risk assessment is required by the designer and the mains supplier, and that BA type devices protect against pollution of fluid categories up to 4 under EN 1717; category 5 water needs a hydraulic separation tank instead. The 575010 is sized for building mains and plant-room inlets, not single fixtures.

Key features from the datasheet

• Controllable reduced pressure zone device to EN 12729, family B type A, per the datasheet standard references
• Upstream check valve, downstream check valve and a discharge device with diaphragm and counter-spring; each of the three zones has a pressure test port
• In normal flow the intermediate chamber stays at least 140 mbar below inlet pressure; the drain opens when the difference falls to just over 140 mbar
• If the downstream check valve is faulty, the device always disconnects the mains from the user system
• Bronze body and cover, stainless-steel check valve stems, springs and drain seat, EPDM diaphragm and seals
• Elastomers approved by certifying bodies for potable water; datasheet lists conformity certification from NF, KIWA UK, KIWA, DVGW, SVGW, RI.SE, BELGAQUA, ACS and VA

Technical specification

The datasheet pairs the flanged unit with a drain tundish to EN 1717 that creates an air gap and is piped to the sewage system.

Selection and ordering guide

The 574 threaded, 575 flanged and 570 pre-assembled series cover DN 15 to DN 100. For a DN 100 mains inlet, the flanged 575 range is the one to quote.

Installation and maintenance notes

• Qualified personnel must install it to current regulations; fit horizontally, downstream of a shut-off valve and an inspectable strainer with drain, with another shut-off valve downstream.
• Install in an accessible position sized to avoid immersion from accidental flooding, with the tundish connected to sewage piping; the datasheet drawings show minimum clearances of 0.5 m.
• Flush the pipe at high flow before installing the preventer and strainer.
• To protect the mains, fit after the water meter; to protect the internal network, fit at the boundary of any contamination risk such as central heating or garden watering.
• A permanent leak at the drain is an early warning of debris in the upstream check valve; open taps to flush, or remove and clean the unit and strainer.
• The device is a health and safety device and needs periodic inspection; the datasheet provides a quick checking method taking under 15 minutes.

Applications in Gulf water systems

Large buildings, hotels, hospitals, labs, laundries, cooling-tower make-up lines and plant rooms in Oman and the GCC often connect potable mains to systems that must not be contaminated, such as boiler and chiller make-up and fire-fighting tanks. The datasheet protection matrix marks such cases, for example heating systems with additives, industrial tanks and fire-fighting systems using pressurised water, as needing backflow protection. Local water authority rules differ, so confirm the required protection category and any approval before ordering.

Selection and installation notes

A backflow preventer is selected from the fluid category, the size of the line and the flow range. Install it in the position and orientation the maker states, in a ventilated and drained location so a relief discharge cannot flood the room, with isolating valves and a strainer on the inlet. Commissioning tests and periodic tests are done by a competent person following the local water authority rules.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Related items

The datasheet lists the 574 threaded series and the 570 pre-assembled group with shut-off valves and strainer. The installation section also requires an inspectable strainer with drain upstream and a tundish to EN 1717.

Related Caleffi products: Caleffi 548052 DN50 Flanged Hydraulic Separator PN16, Caleffi 132512 3/4 Inch Balancing Valve with Flow Meter, Caleffi 140340 DN15 Differential Pressure Regulating Valve, Caleffi 519500 3/4 Inch Adjustable Differential By-Pass Valve, Caleffi 546005 DISCALDIRT 3/4 Inch Deaerator and Dirt Separator and Caleffi 521400 1/2 Inch Anti-Scale Thermostatic Mixing Valve.

Documents and quotation

The official Caleffi 574, 575 and 570 series datasheet 01022/25 EN (2025) is linked on this page. Send the code, quantity and application to request a quotation. See more in Hydraulic Valves & Components.