前言:这是CSA 3.11第三版，杠杆操作压力润滑塞式气体切断阀。它取代了1985年和1988年出版的前两个版本。范围:1.1本标准适用于手动杠杆操作、压力润滑、直通气体切断阀，尺寸NPS¼英寸至8英寸，金属结构，带焊接、法兰或螺纹端，用于天然气、人造气和液化石油气（以蒸汽形式分布，有或没有空气混合物），或其混合物，适用于在零下至860 kPa（125 psig）的压力范围内，在-60℃（-76℉）至180℃（356℉）的工作温度之间使用，并在1290 kPa（187 psig）的最大压力下承受现场压力试验。注:1）本标准涵盖的阀门可用于“沼气”（污水处理过程中产生的甲烷），但由于夹带污染物，其使用须经制造商和买方同意。 2） 未经额外修改，本标准涵盖的阀门不得用于“酸性气体”（夹带硫化氢的气体）。应咨询制造商的建议。1.2A本标准所涵盖的阀门将限于工作温度和/或符合第5条至第9条的特殊规定。第5条-30°C至65°C（-22°F至149°F）第6条-40°C至65°C（-40°F至149°F）第7条-60°C至65°C（-76°F至149°F）第8条-30°C至120°C（-22°F至248°F）第9条-30°C至180°C（-22°F至356°F）1.3除非另有规定，本标准中提及的所有kPa（psi）均视为表压。1.4本标准包含与码/磅数量相对应的SI（公制）单位，目的是允许使用SI（公制）单位。 （IEEE/ASTM SI 10，美国国家公制实践标准，或ISO 80000-1:2009，数量和单位——第1部分:概述，用作从码/磅数量进行公制转换的指南。）如果规定了测量值和其他单位的相应值，则应将第一个规定值视为要求。给定的相应值可能是近似值。如果一个测量值和其他单位的相应值都被规定为引用的标记要求，则应提供第一个或两个规定的单位。1.5在本标准中，“应”用于表示要求，即用户为遵守本标准而应满足的规定；“应该”用于表示建议或建议但不需要的建议； “可”用于表示一个选项或在标准范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

Preface:This is the third edition of CSA 3.11,Lever operated pressure lubricated plug type gas shut-off valves. It supersedes the previous editions published in 1985 and 1988.Scope:1.1This Standard applies to manual lever operated, pressure lubricated, straight way gas shut-off valves, sizes NPS ¼ inch to 8 inch, of metallic construction with welded, or flanged, or threaded ends, for use with natural gas, manufactured gas, and liquefied petroleum gases (distributed as vapour with or without the admixture of air), or mixtures thereof that are suitable for use between service temperatures of -60 °C (-76°F) to 180 °C (356°F) over a pressure range of zero to 860 kPa (125 psig) and withstand field pressure testing to a maximum pressure of 1290 kPa (187 psig).Notes:1) Valves covered by this Standard may be used on "digester gas" (methane produced during sewage treatment), but because of entrained contaminants their use is to be subject to agreement between the manufacturer and the purchaser.2) Valves covered by this Standard may not be used on "sour gas" (gas with entrained hydrogen sulphide) without additional modifications. Manufacturers should be consulted for their recommendation(s).1.2A valve covered by this Standard will be limited to the service temperature and/or special provisions in accordance with Clauses 5 through 9.Clause 5 -30 °C to 65 °C (-22°F to 149°F)Clause 6 -40 °C to 65 °C (-40°F to 149°F)Clause 7 -60 °C to 65 °C (-76°F to 149°F)Clause 8 -30 °C to 120 °C (-22°F to 248°F)Clause 9 -30 °C to 180 °C (-22°F to 356°F)1.3All references to kPa (psi) throughout this Standard are considered as gauge pressure unless otherwise specified.1.4This Standard contains SI (Metric) units corresponding to the yard/pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. (IEEE/ASTM SI 10, American National Standard for Metric Practice, or ISO 80000-1:2009, Quantities and units – Part 1: General, is used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both, are to be provided.1.5In this Standard, "shall" is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.