This part of ISO1452 specifies the characteristics of valves made from unplasticized poly(vinyl chloride) (PVC-U) for piping systems intended for water supply and for buried and above-ground drainage and sewerage under pressure. It also specifies the test parameters for the test methods referred to in this part of ISO1452. In conjunction with ISO1452-1, ISO1452-2, ISO1452-3 and ISO1452-5 it is applicable to PVC-U valves with components of PVC-U, other plastics and non-plastics materials intended to be used for the following: water mains and services buried in ground; conveyance of water above ground for both outside and inside buildings; buried and above-ground drainage and sewerage under pressure. It is applicable to valves in piping systems intended for the supply of water under pressure up to and including 25°C (cold water) intended for human consumption and for general purposes as well as for waste water under pressure. This part of ISO1452 is also applicable to valves for the conveyance of water and waste water up to and including 45°C. For temperatures between 25°C and 45°C, FigureA.1 of ISO1452-2:2009 applies. NOTE1 The producer and the end-user can come to agreement on the possibilities of use for temperatures above 45°C on a case-by-case basis. This part of ISO1452 is applicable to valves of the following types: valves for solvent cementing; valves for elastomeric ring seal joints; valves for flanged joints. NOTE2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.