ISO 16486的本部分规定了根据ISO 16486 1由未增塑聚酰胺（PA-U）制成的阀门的特性，这些阀门拟埋入地下并用于供应气体燃料。 根据ISO 16486，允许在PA-U管道系统中使用由非增塑聚酰胺材料制成的阀门，用于供应符合相关标准的气体燃料，前提是这些阀门具有用于对接熔合或电熔合端的相关PA-U连接（见ISO 164863）。部件，即整个阀门，应满足ISO 16486本部分的要求。 它还规定了ISO 16486本部分所述试验方法的试验参数。 本标准适用于具有插口端或电熔承插的双向阀，其拟与符合ISO 16486 2的PA-U管道连接，无任何配件，或与符合ISO 164863的PA-U配件连接。 ISO 16486的本部分包括公称外径为dn，≤250毫米。

This document specifies the characteristics of valves made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels. It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion sockets intended to be fused with PA-U pipes or fittings conforming to ISO 16486-2 and ISO 16486-3 respectively. Valves made from material other than unplasticized polyamide designed for the supply of gaseous fuels conforming to the relevant standards are permitted to be used in PA-U piping systems according to the ISO 16486 series provided they have relevant PA-U connections for butt fusion or electrofusion ends (see ISO 16486-3). The component, i.e. the complete valve, is required to fulfil the requirements of this document. This document also specifies the test parameters for the test methods it describes. In conjunction with ISO 16486-1, ISO 16486-2, ISO 16486-3 and ISO 16486-5, this document is applicable to PA-U valves and their joints and to joints with components of PA-U and other materials intended to be used under the following conditions: a) a maximum operating pressure (MOP) of up to and including 18 bar[1], or limited to 16 bar under regional CEN requirements, 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 of −20 °C to 40 °C; NOTE 2    For operating temperatures between 20 °C and 40 °C, derating coefficients are specified in ISO 16486-5. This document covers valves for pipes with a nominal outside diameter, dn, ≤ 400 mm.   [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm².