prEN 14367

Non controllable backflow preventer with different pressure zones - Family C, type A prEN 14367

Publication date:   Jul 9, 2026

Scope

This document specifies the:
— field of application:
— The dimensional, the physicochemical, the design, the hydraulic, the mechanical and the acoustic characteristics of non-controllable backflow preventer with different pressure zones, family C, type A, nominal sizes DN 6 to DN 25, nominal pressure PN 10.
It is applicable to:
— Family C, type A, class “a” for general use: devices of class “a” can be capable of working:
— at any pressure up to 1 MPa (10 bar);
— with any pressure variation up to 1 MPa (10 bar);
— at a supply temperature limit of 65 °C and 90 °C for 1 h;
— Family C, type A, class “b” for specific use: devices of class “b” shall be capable of working:
— at any downstream pressure up to 0,3 MPa (3 bar);
— with any downstream pressure variation up to 0,3 MPa (3 bar); at a supply temperature limit of 65 °C and 90 °C for 1 h;
Class “b” devices can capable of operating: at any downstream pressure up to 300 kPa (3 bar), with any downstream pressure variation up to 300 kPa (3 bar) at a supply temperature limit of 65 °C and 90 °C for 1 h. Class “b” devices with specific hydraulic and non-acoustic requirements and are intended to equip filling devices physically integrated into a single-function (heating) or dual-function (heating and domestic hot water) boiler.
It specifies also:
— test methods and requirements for verifying these characteristics;
— marking;
— presentation and the delivery.

Related legislation

Legislation related to this standard