序言这是CSA B64系列、防回流阀和真空断路器的第七版。它取代了之前在2011年、2007年、2001年、1994年、1988年和1976年出版的版本。本版本由以下标准组成:CSA B64。0.真空断路器和防回流阀的定义、一般要求和试验方法；CSA B64。1.1、大气真空断路器（AVB）；CSA B64。1.2、压力真空断路器（PVB）；CSA B64。1.3、防泄漏压力真空断路器（SRPVB）；CSA B64。1.4，真空断路器，空气空间型（ASVB）；CSA B64。2、软管连接真空断路器（HCVB）；CSA B64。2.1、带手动排水功能的软管连接真空断路器（HCVB）；CSA B64。2.1.1、软管连接双止回真空断路器（HCDVB）；CSA B64。2.2、带自动排水功能的软管连接真空断路器（HCVB）；CSA B64。3、带大气口的双止回阀防回流阀（DCAP）；CSA B64。3.1、双止回阀防回流阀，带碳酸气器大气端口（DCAPC）； CSA B64。4、减压原理（RP）防回流阀；CSA B64。4.1、消防系统用减压原理防回流阀（RPF）；CSA B64。5、双止回阀（DCVA）防回流阀；CSA B64。5.1、消防系统用双止回阀防回流阀（DCVAF）；CSA B64。6、双止回阀（DuC）防回流阀；CSA B64。6.1、消防系统用双止回阀防回流阀（DuCF）；CSA B64。7、实验室水龙头真空断路器（LFVB）；CSA B64。8、带中间排气口的双止回阀防回流阀（DuCV）；和CSA B64。消防系统用单止回阀防回流阀（SCVAF）。新版的主要变化如下:在CSA B64中增加了铅要求。0;CSA B64中增加了测试旋塞螺纹要求。0;CSA B64中增加了测试旋塞水道要求。0;取消CSA B64中支撑结构的尺寸要求。1.4; 删除CSA B64图1中的注释。1.4; CSA B64中图2注释的补充。1.4. 这些标准是根据加拿大标准委员会对加拿大国家标准的要求制定的。CSA集团已将其发布为加拿大国家标准。---------------------------------------------------------------------------------------------------------------CSA B64。0:21-真空断路器和防回流阀的定义、一般要求和试验方法范围1。1 CSA B64系列包括饮用水供应系统中用于防止交叉连接的真空断路器和防回流阀。1.2本标准规定了CSA B64系列中部分或全部标准通用的定义、一般要求、试验方法、标记和说明。1.3本标准本身不是一个完整的标准，旨在与CSA B64系列中的一个标准结合使用，以形成特定类型真空断路器或防回流阀的完整标准。 1.4在本标准中，“应”用于表示一项要求，即用户有义务满足的规定，以符合本系列中的每项标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示在本系列标准范围内允许的选项或选项。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。1.5本标准采用国际单位制，即本标准中的记录单位。换算表见附录A。真空用低于环境压力的压力表示。 所有管道尺寸均显示为标称管道尺寸（NPS）。----------------------------------------------------------------------------------------------------------------------------------------CSA B64。1.1:21-大气真空断路器（AVB）范围1.1本标准涵盖大气真空断路器（AVB）。---------------------------------------------------------------------------------------------------------------CSA B64。1.2:21-压力真空断路器（PVB）范围1.1本标准涵盖压力真空断路器（PVB）。---------------------------------------------------------------------------------------------------------------CSA B64。1.3:21-防泄漏压力真空断路器（SRPVB）范围1.1本标准涵盖防泄漏压力真空断路器（SRPVB）。-----------------------------------------------------------------------------------------------------------------------------------------------------------------CSA B64。 1.4:21-空气空间型真空断路器（ASVB）范围1.1本标准涵盖制造的空气空间型真空断路器（ASVB）。----------------------------------------------------------------------------------------------------------------------------------------CSA B64。2:21-软管连接真空断路器（HCVB）范围1.1本标准涵盖软管连接真空断路器（HCVB）。---------------------------------------------------------------------------------------------------------------CSA B64。2.1:21-带手动排水功能的软管连接真空断路器（HCVB）范围1.1本标准涵盖了软管连接真空断路器（HCVB），该断路器包含需要手动操作的排水功能。----------------------------------------------------------------------------------------------------------------------------------------CSA B64。2.1.1:21-软管连接双止回真空断路器（HCDVB）范围1.1本标准涵盖了具有两个止回阀（HCDVB）的软管连接真空断路器，并包含需要手动操作的排水功能。 第二个（下游）止回阀可进行现场测试。---------------------------------------------------------------------------------------------------------------CSA B64。2.2:21-具有自动排水功能的软管连接真空断路器（HCVB）范围1.1本标准涵盖了软管连接真空断路器（HCVB），该断路器包含无需手动操作的自动排水功能。---------------------------------------------------------------------------------------------------------------CSA B64。3:21-带大气口（DCAP）的双止回阀防回流阀范围1.1本标准涵盖带大气口（DCAP）的双止回阀防回流阀。---------------------------------------------------------------------------------------CSA B64。3.1:21-双止回阀防回流阀，带碳化器大气端口（DCAPC）范围1。 1.本标准涵盖了双止回阀防回流阀，该防回流阀带有用于碳酸化器（DCAPC）的大气端口CSA B64。4:21-减压原理（RP）防回流阀范围1.1本标准涵盖减压原理（RP）防回流阀。----------------------------------------------------------------------------------------------------------------------------------------CSA B64。4.1:21-消防系统（RPF）用减压原理防回流阀范围1.1本标准涵盖专门设计用于消防系统（RPF）的减压原理防回流阀CSA B64。5:21-双止回阀（DCVA）防回流阀范围1。 1本标准涵盖双止回阀（DCVA）防回流阀。---------------------------------------------------------------------------------------------------------------CSA B64。5.1:21-消防系统用双止回阀防回流阀（DCVAF）范围1.1本标准涵盖了专门设计用于消防系统（DCVAF）的双止回阀防回流阀。----------------------------------------------------------------------------------------------------------------CSA B64。6:21-双止回阀（DuC）防回流阀范围1.1本标准涵盖双止回阀（DuC）防回流阀。---------------------------------------------------------------------------------------------------------------CSA B64。6.1:21-消防系统用双止回阀防回流阀（DuCF）范围1.1本标准涵盖设计用于消防系统（DuCF）的双止回阀防回流阀。 --------------------------------------------------------------------------------------------------------------------------------CSA B64。7:21-实验室水龙头真空断路器（LFVB）范围1.1本标准涵盖实验室水龙头上使用的真空断路器。----------------------------------------------------------------------------------------------------------------------------------------CSA B64。8:21-带中间通风口（DuCV）的双止回阀防回流阀范围1.1本标准涵盖带中间通风口（DuCV）的双止回阀防回流阀。注:这些设备设计用于流量小于等于0.25 L/s的单个插座或设备。---------------------------------------------------------------------------------------CSA B64。9:21-消防系统用单止回阀防回流阀（SCVAF）范围1.1本标准涵盖专门设计用于消防系统（SCVAF）的单止回阀防回流阀。

PrefaceThis is the seventh edition of the CSA B64 Series, Backflow preventers and vacuum breakers. It supersedes the previous editions, published in 2011, 2007, 2001, 1994, 1988, and 1976. This edition consists of the following Standards:CSA B64.0, Definitions, general requirements, and test methods for vacuum breakers and backflow preventers;CSA B64.1.1, Atmospheric vacuum breakers (AVB);CSA B64.1.2, Pressure vacuum breakers (PVB);CSA B64.1.3, Spill-resistant pressure vacuum breakers (SRPVB);CSA B64.1.4, Vacuum breaker, air space type (ASVB);CSA B64.2, Hose connection vacuum breakers (HCVB);CSA B64.2.1, Hose connection vacuum breakers (HCVB) with manual draining feature;CSA B64.2.1.1, Hose connection dual check vacuum breakers (HCDVB);CSA B64.2.2, Hose connection vacuum breakers (HCVB) with automatic draining feature;CSA B64.3, Dual check valve backflow preventers with atmospheric port (DCAP);CSA B64.3.1, Dual check valve backflow preventers with atmospheric port for carbonators (DCAPC);CSA B64.4, Reduced pressure principle (RP) backflow preventers;CSA B64.4.1, Reduced pressure principle backflow preventers for fire protection systems (RPF);CSA B64.5, Double check valve (DCVA) backflow preventers;CSA B64.5.1, Double check valve backflow preventers for fire protection systems (DCVAF);CSA B64.6, Dual check valve (DuC) backflow preventers;CSA B64.6.1, Dual check valve backflow preventers for fire protection systems (DuCF);CSA B64.7, Laboratory faucet vacuum breakers (LFVB);CSA B64.8, Dual check valve backflow preventers with intermediate vent (DuCV); andCSA B64.9, Single check valve backflow preventers for fire protection systems (SCVAF).The major changes in this new edition are the following:addition of lead requirement in CSA B64.0;addition of test cock thread requirements to CSA B64.0;addition of test cock waterway requirement to CSA B64.0;removal of the dimensional requirement for support structures in CSA B64.1.4;removal of note from Figure 1 in CSA B64.1.4; andaddition of note to Figure 2 in CSA B64.1.4. These Standards have been developed in compliance with Standards Council of Canada requirements for National Standards of Canada.They have been published as National Standards of Canada by CSA Group. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.0:21 - Definitions, general requirements, and test methods for vacuum breakers and backflow preventersScope1.1 The CSA B64 Series covers vacuum breakers and backflow preventers that are used in potable water supply systems to prevent cross-connections.1.2 This Standard specifies definitions, general requirements, test methods, markings, and instructions that are common to some or all of the Standards in the CSA B64 Series.1.3 This Standard is not a complete Standard in itself and is intended to be used in conjunction with one of the Standards in the CSA B64 Series to form a complete Standard for a particular type of vacuum breaker or backflow preventer.1.4 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with each Standard in the Series; "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 Standards in the Series. 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.1.5 This Standard is written in SI units, which are the units of record for the purposes of this Standard. For conversion tables, see Annex A. Vacuum is expressed in pressure below ambient. All pipe sizes are shown as nominal pipe sizes (NPS). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.1.1:21 - Atmospheric vacuum breakers (AVB)Scope 1.1 This Standard covers atmospheric vacuum breakers (AVB). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.1.2:21 - Pressure vacuum breakers (PVB)Scope 1.1 This Standard covers pressure vacuum breakers (PVB). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.1.3:21 - Spill-resistant pressure vacuum breakers (SRPVB)Scope 1.1 This Standard covers spill-resistant pressure vacuum breakers (SRPVB). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.1.4:21 - Vacuum breaker, air space type (ASVB)Scope 1.1 This Standard covers manufactured vacuum breakers, air space type (ASVB). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.2:21 - Hose connection vacuum breakers (HCVB)Scope 1.1 This Standard covers hose connection vacuum breakers (HCVB). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.2.1:21 -Hose connection vacuum breakers (HCVB) with manual draining featureScope 1.1 This Standard covers hose connection vacuum breakers (HCVB) that incorporate a draining feature that requires manual operation. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.2.1.1:21 -Hose connection dual check vacuum breakers (HCDVB)Scope 1.1 This Standard covers hose connection vacuum breakers that have two check valves (HCDVB) and that incorporate a draining feature that requires manual operation. The second (downstream) check valve is field-testable. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.2.2:21 - Hose connection vacuum breakers (HCVB) with automatic draining featureScope 1.1 This Standard covers hose connection vacuum breakers (HCVB) that incorporate an automatic draining feature that does not require manual operation. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.3:21 - Dual check valve backflow preventers with atmospheric port (DCAP)Scope 1.1 This Standard covers dual check valve backflow preventers with an atmospheric port (DCAP). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.3.1:21 - Dual check valve backflow preventers with atmospheric port for carbonators (DCAPC)Scope 1.1 This Standard covers dual check valve backflow preventers with an atmospheric port for carbonators (DCAPC). ------------------------------------------------------------------------------------------------------------------------------- CSA B64.4:21 - Reduced pressure principle (RP) backflow preventersScope 1.1 This Standard covers reduced pressure principle (RP) backflow preventers. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.4.1:21 - Reduced pressure principle backflow preventers for fire protection systems (RPF)Scope 1.1 This Standard covers reduced pressure principle backflow preventers specifically designed for use in fire protection systems (RPF). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.5:21 - Double check valve (DCVA) backflow preventersScope 1.1 This Standard covers double check valve (DCVA) backflow preventers. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.5.1:21 - Double check valve backflow preventers for fire protection systems (DCVAF)Scope 1.1 This Standard covers double check valve backflow preventers specifically designed for use in fire protection systems (DCVAF). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.6:21 - Dual check valve (DuC) backflow preventersScope 1.1 This Standard covers dual check valve (DuC) backflow preventers. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.6.1:21 - Dual check valve backflow preventers for fire protection systems (DuCF)Scope 1.1 This Standard covers dual check valve backflow preventers designed for use in fire protection systems (DuCF). -------------------------------------------------------------------------------------------------------------------------------- CSA B64.7:21 - Laboratory faucet vacuum breakers (LFVB)Scope 1.1 This Standard covers vacuum breakers for use on laboratory faucets. -------------------------------------------------------------------------------------------------------------------------------- CSA B64.8:21 - Dual check valve backflow preventers with intermediate vent (DuCV)Scope 1.1 This Standard covers dual check valve backflow preventers with an intermediate vent (DuCV). Note: These devices are designed to be used on individual outlets or appliances with flow rates of 0.25 L/s or less. ------------------------------------------------------------------------------------------------------------------------------- CSA B64.9:21 - Single check valve backflow preventers for fire protection systems (SCVAF)Scope 1.1 This Standard covers single check valve backflow preventers specifically designed for use in fire protection systems (SCVAF).