This ÖNORM specifies performance requirements and means for evaluation of conformity for valves of thermoplastic material, by reference to product standards, for use in building and civil engineering applications for the delivery of liquid and gaseous fluids. It also contains information required for the purposes of regulatory marking. Compliance with the conformity procedures given in clause 5 and in Annex ZA confers a presumption of fitness for CE-marking of thermoplastic valves installed in various systems.