Backflow Preventer DISCONNECTOR BRA.ECO 3F – DN 65, L = 360 mm, flanged – SPECIAL OFFER

Product detailed description

How the disconnector works

BRA.ECO 3F is a flanged 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 between them. 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., due to a supply failure) or the pressure in the consumer network rises above that of the public network, 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 plants, 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 protection networks with an operating pressure up to 12 bar.

Construction

• body, top and bottom cover made of grey cast iron GJL 250, internal and external epoxy coating RAL 5002
• seals made of EPDM
• test ports with mini-valves for pressure measurement before the device and in the central chamber, the ECO3 TEST device allows functional testing
• removable cover for easy maintenance
• PN 10 flanges according to STN EN 1092-1, construction length 360 mm, weight 30 kg, Kv 64 m³/h

Installation

The disconnector is installed 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 must 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 siphon, 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 a filter is a necessary condition for proper function – otherwise dirt and pipe debris 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. During reverse flow, the central chamber is drained via the safety discharge valve, so it is connected to the waste via a waste siphon, 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.

Can the check valves be replaced?
Yes, after removing the cover, the discharge valve and both check valves are accessible. The manual lists replacement parts for DN 65 as R1 K025996C80, R2 K025997C80 and RS K025998C80.