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Standards Development
This European Standard specifies, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteristics of mechanical disconnector, hydraulic actuated Family G, type B. This European Standard is applicable to mechanical disconnectors hydraulic actuated in nominal sizes DN 8 up to DN 250, intended to prevent the return of water having lost its original sanitary and drinking qualities (called "polluted water" in this European Standard), into the potable water distribution system whenever the pressure of the latter is temporarily lower than in the polluted circuit. This European Standard covers the mechanical disconnectors hydraulic actuated of PN 10 that are capable of working without modification or adjustment: at any pressure up to 1 MPa (10 bar); with any pressure variation up to 1 MPa (10 bar); in permanent duty at a limit temperature of 65 °C and 90 °C for 1 h maximum. It specifies also the test methods and requirements for verifying these characteristics, the marking and the presentation at delivery..
In 2012 the European standard EN 13434, Devices to prevent pollution by backflow of potable water Mechanical disconnector flow actuated — Family G, Type B was withdrawn.
According to EN 1717:2000, table 2, disconnectors family G, type B protect drinking water against fluid category 4. Also backflow preventers family B, type A protect against fluid category 4. Due to the function and design disconnectors GB have a much lower pressure loss than backflow preventers BA. Therefore in many installations disconnectors GB are
installed and cannot be replaced backflow preventers BA. Additionally due to the design of disconnectors GB are subscribed where low pressure losses are required, e.g. in fire protection systems. Other than backflow preventers BA disconnectors GB provide an air gap in case there is no flow. This property of disconnectors GB suit them specifically for
installations where no flow is given for a long period of time, e.g. fire protection systems.
For the reasons mentioned, disconnectors GB are required. A European standard for disconnectors GB grants high
economic feasibility in case of replacement.
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