ISO 1452-4:2009规定了由未增塑聚氯乙烯（PVC？U）制成的阀门的特性，这些阀门用于供水管道系统，以及埋地和地上排水和压力排水系统。它还规定了所述试验方法的试验参数。 结合ISO 1452-1、ISO 1452-2、ISO 1452-3和ISO 1452-5，适用于PVC？U阀门，其部件为PVC-U、其他塑料和非塑料材料，用于以下用途: -埋在地下的水管和服务设施； -建筑物内外的地面输水； -有压力的地下和地上排水和污水系统。 本标准适用于压力不超过25°C（冷水）的管道系统中的阀门，供人类使用，也适用于一般用途以及压力废水。它也适用于输送45°C及以下水和废水的阀门。

ISO 1452-4:2009 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 conjunction with ISO 1452-1, ISO 1452-2, ISO 1452-3 and ISO 1452-5 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. It is also applicable to valves for the conveyance of water and waste water up to and including 45 °C.