Backflow Preventer DISCONNECTOR BRA.ECO 3T – 2", L = 428 mm, Threaded – Special Offer

Product detailed description

How the disconnector works

BRA.ECO 3T is a threaded check valve with an adjustable low-pressure zone. The body contains two spring-loaded check valves and a central chamber with a safety discharge valve in between. During normal flow, the pressure in the central chamber is at least 140 mbar lower than at the inlet and the discharge valve remains closed. If the inlet pressure drops (e.g., in case of a supply failure) or the pressure in the consumer network rises above the public network pressure, the valve opens, drains the central chamber into the sewer, and separates the two networks.

The device protects against liquids up to category 4 according to STN EN 1717, for example when connecting boilers, washing machines, industrial facilities, laboratories, or fire-fighting equipment. For category 5 (microbiological and viral risk), an air gap must be used. Although the nominal pressure is PN 10 according to STN EN 12729, the manufacturer also approves its use in fire-fighting networks with operating pressures up to 12 bar.

Construction

• body and upper cover made of bronze CuSn5Zn5Pb2
• seals made of EPDM
• test ports with mini-valves for pressure measurement before the device and in the central chamber; functional testing is enabled by the ECO3 TEST device
• removable cover for easy maintenance
• threaded connection 2" according to ISO 228/1, construction length 428 mm, weight 13 kg, Kv 38.6 m³/h

Installation

The disconnector is mounted horizontally with the discharge valve pointing downward, in an accessible, ventilated location protected from freezing and flooding. A shut-off valve and a filter with a drain plug should be installed before it – the device does not function properly without a filter – and a second shut-off valve after it. The discharge valve must be connected to the sewer via a waste trap, which is part of the product, and the water must drain by gravity. Installation should be carried out by a qualified professional.

Technical parameters

Frequently asked questions

Why must a filter be installed before the disconnector?
The manufacturer indicates that the filter is a necessary condition for proper function – otherwise, dirt and pipe residues could cause malfunctions. It is installed between the inlet shut-off valve and the disconnector and must have a drain plug.

Must the disconnector be connected to the sewer?
Yes. In case of reverse flow, the central chamber is drained through the safety discharge valve, so it must be connected to the waste via a waste trap, which is part of the product; the water must drain by gravity.

Is it suitable for all liquid categories?
No, it protects against liquids up to category 4 according to STN EN 1717. For category 5, i.e., liquids with microbiological or viral risk, an air gap is required.

How is the functionality of the disconnector checked?
Through the test ports with mini-valves, the pressure before the device and in the central chamber is measured, for example with the ECO3 TEST device. The pressure gauge must be at the same height as the device during the test.