气体燃料供应用塑料管道系统.聚乙烯（PE）.第4部分:阀门

[中文适用范围]： 本文件规定了气体燃料供应领域管道系统用聚乙烯 (PE) 阀门的特性。 它适用于与分别符合 ISO 4437−2 和 ISO 4437-3 的 PE 管道或管件熔接的带有插端或电熔承插口的单向和双向隔离阀。 由 PE 以外的材料制成、设计用于供应符合相关标准的气体燃料的阀门可用于符合 ISO 4437 系列的 PE 管道系统，前提是它们具有用于对接熔接或电熔端的 PE 连接，包括集成式材料过渡接头，符合 ISO 4437-3 的要求。 它还规定了本文件中提到的测试方法的测试参数。 结合 ISO 4437 系列的第 1、2、3 和 5 部分，本文件适用于 PE 阀门及其接头以及拟在以下条件下使用的由 PE 和其他材料制成的部件的接头： ) 出于设计目的，在 20 °C 参考温度下最大工作压力 (MOP) 高达 10 bar 1)；注 1：就本文件和 ISO 8233 的参考而言，MOP 被视为公称压力。 b) 工作温度在-20°C 至 40°C 之间。 注2 对于20°C 至40°C 之间的工作温度，降额系数在ISO 4437-5 中定义。 本文件涵盖了设计用于与公称外径 dn ≤ 400 mm 的管道连接的阀体。 [外文原描述]： This document specifies the characteristics of valves made from polyethylene (PE) for piping systems in the field of the supply of gaseous fuels. It is applicable to unidirectional and bi-directional isolating valves with spigot ends or electrofusion sockets intended to be fused with PE pipes or fittings conforming to ISO 4437−2 and ISO 4437‑3 respectively. Valves made from materials other than PE, designed for the supply of gaseous fuels conforming to the relevant standards can be used in PE piping systems according to ISO 4437 series, provided that they have PE connections for butt fusion or electrofusion ends, including integrated material transition joints, conforming to ISO 4437-3. It also specifies the test parameters for the test methods referred to in this document. In conjunction with parts 1, 2, 3 and 5 of the ISO 4437 series, this document is applicable to PE valves, their joints and to joints with components of PE and other materials intended to be used under the following conditions: a) a maximum operating pressure (MOP) up to and including 10 bar[1] at a reference temperature of 20 °C for design purposes; NOTE 1 For the purpose of this document and the references to ISO 8233, MOP is considered to be nominal pressure. b) an operating temperature between −20 °C to 40 °C. NOTE 2 For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO 4437‑5. This document covers valve bodies designed for connection with pipes with a nominal outside diameter d n ≤ 400 mm. [1] 1 bar = 0,1 MPa =10 5 Pa; 1 MPa = 1 N/mm 2 .