NEN EN 12050-4 : 2015

1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Principles of construction
   5.1 Connections
   5.2 Solids passage
   5.3 Design requirements
   5.4 Cleaning opening
6 Materials
7 Testing documentation and samples to be tested
8 Testing
   8.1 General requirements
   8.2 Functional testing
9 Conformity evaluation
   9.1 General
   9.2 Initial testing of the products (type testing)
   9.3 Factory production control (FPC) carried out by
       the manufacturer (internal conformity evaluation)
   9.4 Non-conforming products
10 Marking
Annex A (normative)
    Noise level
Annex B (informative)
     Recommended materials
Annex C (informative)
    Conformity evaluation by an independent third party
    (third party evaluation)
Annex Z (informative)
    Links with the EU Construction Products Directive
    (89/106)
Bibliography
 (third party evalu

Defines general requirements, basic construction and testing principles together with information on materials and the relevant assessment and verification of constancy of performance. Pertains to non-return valves used for faecal-free wastewater and wastewater containing faecal matter lifting plants.