本文件规定了由聚乙烯（PE）制成的用于地下或地上应用的配件，旨在输送人类消费的水、处理前的原水、压力下的排水和污水、真空下水道系统以及其他用途的水。 注1预期用途包括入海排污口、敷设于水中及架设于桥下的管道之间的连接。 本文件还规定了本文件中提及的测试方法的测试参数。 与ISO 4427系列的其他部分一起，本文件适用于PE配件、具有PE或其他材料部件的接头，预期在以下条件下使用: a)最大允许工作压力(PFA)高达并包括25巴[1]； b)20℃的操作温度作为参考温度。注2对于其他工作温度，指南见ISO 4427 1:20 19附录A。 本文件涵盖了一系列最大允许工作压力，并给出了有关颜色的要求。 注3买方或指定人员有责任在考虑到其特定要求和安装惯例或守则的情况下，从这些方面作出适当的选择。 本文件适用于以下类型的配件: 1.熔接配件； a.电熔配件； b.插口端配件（用于使用加热工具的对接融合和电熔插座融合）； c.插座熔接配件（见附件A）； 2.机械配件； a.压缩配件； b.法兰配件； 3.装配式配件（见附件B）。 [1]1巴=0.1 MPa=105巴；1MPa=1N/mm2。

This document specifies the fittings made from polyethylene (PE) for buried or above ground applications, intended for the conveyance of water for human consumption, raw water prior to treatment, drainage and sewerage under pressure, vacuum sewer systems, and water for other purposes. NOTE 1 The intended uses include sea outfalls, laid in water and connection between pipes suspended below bridges. This document also specifies the test parameters for the test methods referred to in this document. In conjunction with the other parts of the ISO 4427 series, this document is applicable to PE fittings, to joints with components of PE or other materials, intended to be used under the following conditions: a) a maximum allowable operating pressure (PFA) up to and including 25 bar[1]; b) an operating temperature of 20 °C as the reference temperature. NOTE 2 For other operating temperatures, guidance is given in ISO 4427？1:2019, Annex A. This document covers a range of maximum allowable operating pressures and gives requirements concerning colours. NOTE 3 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and installation practices or codes. This document is applicable to fittings of the following types: 1. fusion fittings;

1. a. electrofusion fittings;
2. b. spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);
3. c. socket fusion fittings (see Annex A);

2. mechanical fittings;

1. a. compression fittings;
2. b. flanged fittings;

3. fabricated fittings (see Annex B). [1] 1 bar = 0,1 MPa = 10⁵ Pa; 1 MPa = 1 N/mm².