1.1本标准规定:生成疲劳分布数据的试验和统计方法；验证流体动力液压阀额定压力的试验和统计方法；在判断流体动力应用中通常使用的液压阀的一种压力能力方面的通用要求和行业理念；产品比较的统一方法；液压阀可能包含一个或多个压力区。每个压力区的压力等级可基于相邻低压区或大气的最大压差；附件（见3.3）可作为液压阀的组成部分或独立部件。 1.2本标准对以下条件进行了限制:构成或保持承压外壳的元件的恒定振幅、压力诱导载荷；至少100000次循环的产品寿命；NFPA/T2中定义的压力水平和脉冲持续时间。6.1 R2-2000；从夏比冲击转变温度到蠕变敏感性阈值的温度；与承压外壳材料化学相容的环境；材料包括铝、镁、钢、铁、铜基合金、钴、钛、不锈钢、镍钢和蒙乃尔合金。特别排除的是蠕变敏感材料，如: 锌、塑料、橡胶和密封装置。1.3本标准鼓励制造商使用这种常用方法来提高其压力额定值的可信度。

1.1 This standard provides:test and statistical methods for generating fatigue distribution data;test and statistical methods for conducting a verification of the pressure ratings on fluid power hydraulic valves;common requirements and an industry-wide philosophy in judging one type of pressure capability for hydraulic valves typically used in fluid power applications;uniform methods of product comparison;hydraulic valves may contain one or more pressure zones. Each pressure zone may have pressure ratings based on a maximum differential pressure to an adjacent lower pressure zone or atmosphere;attachments (see 3.3) can be rated as integral parts of hydraulic valves or as an independent components.1.2 This standard limits conditions as follows:constant amplitude, pressure induced loading of the elements that constitute or maintain the pressure containing envelope;product life of at least 100,000 cycles;pressure levels and pulse durations as defined in NFPA/T2.6.1 R2-2000;temperatures from the charpy impact transition temperature to the threshold of creep sensitivity;environments which are chemically compatible with the materials of the pressure containing envelope;materials that are aluminum, magnesium, steel, iron, copper based alloys, cobalt, titanium, stainless steels, nickel steels and monel. Specifically excluded are more creep sensitive materials such as: zinc, plastic, rubber and sealing devices.1.3 This standard encourages manufacturers to use this common method to enhance the credibility of their pressure ratings.