EN 14367:2005

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
   3.1 non controllable backflow preventer with different
       pressure zones - Family C - Type A
   3.2 Specific use
4 Nominal size (denomination)
   4.1 Class a device
   4.2 Class b device
5 Designation
6 Symbolization
7 Physico-chemical characteristics
   7.1 Materials
   7.2 Nature of the materials
8 Design
   8.1 General
   8.2 Relief valve
9 Characteristics and test methods
   9.1 General
   9.2 General tolerances
   9.3 Expression of the results
   9.4 End connections
   9.5 Mechanical characteristics
   9.6 Tightness characteristics
   9.7 Hydraulic characteristics
10 Order of testing
11 Marking and technical documents
   11.1 Marking
   11.2 Technical documents
12 Presentation at delivery
Annex A (normative) Complementary test methods on
                      backflow preventers CA class b with a
                      plastic body
Annex B (informative) Examples of presentation of test results

This document specifies the:field of application;the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteristics of non-controllable backflow preventer with different pressure zones - family C - type A and of nominal sizes DN 6 to DN 50 inclusive and in nominal pressure PN 10.It is applicable to:-Family C, type A, class "a" for general use: devices of class "a" shall 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 300 kPa (3 bar);with any downstream pressure variation up to 300 kPa (3 bar);The devices of class "b" having specific hydraulic and no acoustic requirements and are meant for equipped filling devices built-in one or two functions boilers (heating only or heating and production of sanitation hot water).It concerns boilers with a 70 kW maximum power and maximum temperature of 110°C.It specifies also-test methods and requirements for verifying these characteristics;-marking;-presentation and the delivery.