Preface:

This is the sixth edition of the CSA B64 Series, Backflow preventers and vacuum breakers. It supersedes the previous editions, published in 2007, 2001, 1994, 1988, and 1976.

This edition consists of the following Standards:
(a) B64.0, Definitions, general requirements, and test methods for vacuum breakers and backflow preventers;
(b) B64.1.1, Atmospheric vacuum breakers (AVB);
(c) B64.1.2, Pressure vacuum breakers (PVB);
(d) B64.1.3, Spill-resistant pressure vacuum breakers (SRPVB);
(e) B64.1.4, Vacuum breaker, air space type (ASVB);
(f) B64.2, Hose connection vacuum breakers (HCVB);
(g) B64.2.1, Hose connection vacuum breakers (HCVB) with manual draining feature;
(h) B64.2.1.1, Hose connection dual check vacuum breakers (HCDVB);
(i) B64.2.2, Hose connection vacuum breakers (HCVB) with automatic draining feature;
(j) B64.3, Dual check valve backflow preventers with atmospheric port (DCAP);
(k) B64.3.1, Dual check valve backflow preventers with atmospheric port for carbonators (DCAPC);
(l) B64.4, Reduced pressure principle (RP) backflow preventers;
(m) B64.4.1, Reduced pressure principle backflow preventers for fire protection systems (RPF);
(n) B64.5, Double check valve (DCVA) backflow preventers;
(o) B64.5.1, Double check valve backflow preventers for fire protection systems (DCVAF);
(p) B64.6, Dual check valve (DuC) backflow preventers;
(q) B64.6.1, Dual check valve backflow preventers for fire protection systems (DuCF);
(r) B64.7, Laboratory faucet vacuum breakers (LFVB);
(s) B64.8, Dual check valve backflow preventers with intermediate vent (DuCV); and
(t) B64.9, Single check valve backflow preventers for fire protection systems (SCVAF).

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B64.0-11 - Definitions, general requirements, and test methods for vacuum breakers and backflow preventers

Scope:

1.1
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 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 CSA standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to 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 (nonmandatory) to define their application.

1.5
This Standard is written in SI (metric) units; for conversion tables, see Annex A. Vacuum is expressed in pressure below ambient. All pipe sizes are shown as nominal pipe sizes (NPS).

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B64.1.1-11 - Atmospheric vacuum breakers (AVB)

Scope:

This Standard covers atmospheric vacuum breakers (AVB).

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B64.1.2-11 - Pressure vacuum breakers (PVB)

Scope:

This Standard covers pressure vacuum breakers (PVB).

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B64.1.3-11 - Spill-resistant pressure vacuum breakers (SRPVB)

Scope:

This Standard covers spill-resistant pressure vacuum breakers (SRPVB).

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B64.1.4-11 - Vacuum breaker, air space type (ASVB)

Scope:

This Standard covers manufactured vacuum breakers, air space type (ASVB).

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B64.2-11 - Hose connection vacuum breakers (HCVB)

Scope:

1.1
This Standard covers hose connection vacuum breakers (HCVB).

1.2
CSA B64.2.1 and CSA B64.2.1.1 cover HCVB and HCDVB devices, respectively, that incorporate a manual draining feature, while CSA B64.2.2 covers HCVB devices that incorporate an automatic draining feature.

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B64.2.1-11 - Hose connection vacuum breakers (HCVB) with manual draining feature

Scope:

This Standard covers hose connection vacuum breakers (HCVB) that incorporate a draining feature that requires manual operation.

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B64.2.1.1-11 - Hose connection dual check vacuum breakers (HCDVB)

Scope:

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.

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B64.2.2-11 - Hose connection vacuum breakers (HCVB) with automatic draining feature

Scope:

This Standard covers hose connection vacuum breakers (HCVB) that incorporate an automatic draining feature that does not require manual operation.

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B64.3-11 - Dual check valve backflow preventers with atmospheric port (DCAP)

Scope:

This Standard covers dual check valve backflow preventers with an atmospheric port (DCAP).

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B64.3.1-11 - Dual check valve backflow preventers with atmospheric port for carbonators (DCAPC)

Scope:

This Standard covers dual check valve backflow preventers with an atmospheric port for carbonators (DCAPC).

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B64.4-11 - Reduced pressure principle (RP) backflow preventers

Scope:

This Standard covers reduced pressure principle (RP) backflow preventers.

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B64.4.1-11 - Reduced pressure principle backflow preventers for fire protection systems (RPF)

Scope:

This Standard covers reduced pressure principle backflow preventers specifically designed for use in fire protection systems (RPF).

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B64.5-11 - Double check valve (DCVA) backflow preventers

Scope:

This Standard covers double check valve (DCVA) backflow preventers.

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B64.5.1-11 - Double check valve backflow preventers for fire protection systems (DCVAF)

Scope:

This Standard covers double check valve backflow preventers specifically designed for use in fire protection systems (DCVAF).

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B64.6-11 - Dual check valve (DuC) backflow preventers

Scope:

This Standard covers dual check valve (DuC) backflow preventers.

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B64.6.1-11 - Dual check valve backflow preventers for fire protection systems (DuCF)

Scope:

This Standard covers dual check valve backflow preventers designed for use in fire protection systems (DuCF).

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B64.7-11 - Laboratory faucet vacuum breakers (LFVB)

Scope:

1.1
This Standard covers vacuum breakers for use on laboratory faucets.

1.2
Laboratory faucet vacuum breakers (LFVB) covered by this Standard are intended to be installed on the discharge side of the last control valve and are not intended for use under constant pressure conditions.

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B64.8-11 - Dual check valve backflow preventers with intermediate vent (DuCV)

Scope:

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.

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B64.9-11 - Single check valve backflow preventers for fire protection systems (SCVAF)

Scope:

This Standard covers single check valve backflow preventers specifically designed for use in fire protection systems (SCVAF).