1、B356-10Water pressure reducing valves for domestic water supply systemsLegal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers represe
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15、t is in PDF format. Limited copies of this document in print or paper form may be distributed only to persons who are authorized by CSA to have such copies, and only if this Legal Notice appears on each such copy.In addition, users may not and may not permit others to.alter this document in any way
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17、the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.Update No. 2CAN/CSA-B356-10October 2015Note: For information about the Standards Update Service or if y
18、ou are missing any updates, go to shop.csa.ca or e-mail techsupportcsagroup.org.Title: Water pressure reducing valves for domestic water supply systems originally published August 2010Revisions issued: Update No. 1 March 2011The following revisions have been formally approved and are marked by the s
19、ymbol delta () in the margin on the attached replacement pages:Revised Clause 2New Clause 4.1.1ADeleted None Update your copy by inserting these revised pages.Keep the pages you remove for reference. 2015 CSA Group Water pressure reducing valves for domestic water supply systemsOctober 2015B356-10Wa
20、ter pressure reducing valves for domestic water supply systems1 Scope1.1 This Standard applies to self-acting spring-operated devices that automatically reduce the initial pressure in water systems to a set lower pressure. It applies to devices that are of the direct-acting diaphragm type with a mea
21、ns for adjusting the pressure setting. Valves can be with or without an integral bypass relief valve or strainer.1.2 This Standard provides requirements for material specifications, construction, structural integrity tests, capacity, reduced pressure deviations, instructions, and marking.1.3 In CSA
22、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
23、 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 a
24、nd may be written as requirements.Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.1.4 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only
25、.2 Reference publicationsThis Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.CSA (Canadian Standards Association)C22.2 No. 0.15-01 (R2006)Adhesive labelsASME (The American Society of
26、 Mechanical Engineers)ANSI/ASME B1.1-2003Unified Inch Screw Threads (UN and UNR Thread Form)ANSI/ASME B1.20.1-1983 (R2006)Pipe Threads, General Purpose, Inch1(Replaces p. 1, August 2010)B356-10 2015 CSA GroupOctober 2015ANSI/ASME B1.20.3-1976 (R2008)Dryseal Pipe Threads, InchASSE (American Society o
27、f Sanitary Engineering)ANSI/ASSE 1003-2009Performance Requirements for Water Pressure Reducing Valves for Domestic Water Distribution SystemsANSI/ASSE 1061-2006Performance Requirements for Push-Fit FittingsISA (International Society of Automation)ANSI/ISA 75.02.01-2008Controlled Valve Capacity Test
28、ProceduresISO (International Organization for Standardization)965-1:1998ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data965-2:1998ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads M
29、edium quality965-3:1998ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threads965-4:1998ISO general purpose metric screw threads Tolerances Part 4: Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped
30、 with tolerance position H or G after galvanizing965-5:1998ISO general purpose metric screw threads Tolerances Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizingNSF International/ANSI
31、(American National Standards Institute)NSF/ANSI 61-2013Drinking Water System Components Health EffectsNSF/ANSI 372-2011Drinking Water System Components Lead Content3 DefinitionsThe following definitions shall apply in this Standard:Adjustment range the range of pressure between the lowest and the hi
32、ghest, to which a pressure reducing valve can be adjusted by existing means under static (no-flow) conditions.Bypass relief valve a check valve that opens to permit a reverse flow of water from the building system back into the supply main when the system pressure is increased to greater than supply
33、 pressure by the expansion of water as it is heated in the system.Capacity the rate of water flow through a valve under specified pressure conditions, expressed in litres per second (L/s).Demand the flow necessary to satisfy system requirements.(Replaces p. 2, August 2010)2 2015 CSA Group Water pres
34、sure reducing valves for domestic water supply systemsOctober 2015Hydrostatic pressure the pressure exerted by or existing within a liquid at rest with respect to adjacent bodies.Initial pressure the static pressure at the inlet of a device.Pressure differential the difference between initial and re
35、duced flowing pressures.Pressure reducing valve, water an automatic device that reduces an initial supply pressure to a specified lower pressure.Push-fit fitting a mechanical fitting that joins pipes or tubes and achieves a seal by pushing the mating pipe or tube into the fitting by hand. Note: A pu
36、sh-fit fitting can be removable or non-removable.Reduced flowing pressure the pressure maintained at the outlet of the valve when water is flowing at a measured rate. Note: The reduced flowing pressure changes as the demand changes.Reduced pressure the static pressure at the outlet of the device.Red
37、uced pressure deviation the deviation of the reduced pressure caused by a variation in the initial pressure.Reduced pressure fall-off the change downward in the reduced pressure from lockup that causes the device to open and allow water to flow through it at the rate needed to satisfy demand.Supply
38、(initial) pressure the pressure supplied to the valve from a street main or other supply source.4 General requirements4.1 Materials4.1.1 Harmful materialsMaterials in contact with potable water flowing through the device shall meet the applicable requirements of NSF/ANSI 61.4.1.1A Lead contentValves
39、 intended to convey or dispense water used for human consumption, through drinking or cooking, shall not contain a weighted average lead content in excess of 0.25% when evaluated in accordance with NSF/ANSI 372.4.1.2 Valve and strainer bodiesBodies of valves and strainers shall be made of one of the
40、 following:(a) cast copper alloy;(b) forged copper alloy; or(c) cast stainless steel at least equal to that of Type 300 stainless steel.4.1.3 Corrosion resistance4.1.3.1 All wetted parts of the device shall have a corrosion resistance at least equal to that of a copper alloy of not less than 60% cop
41、per.3(Replaces p. 3, August 2010)B356-10 2015 CSA GroupOctober 20154.1.3.2 Stainless steel shall have a corrosion resistance at least equal to that of Type 300 series stainless steel.4.1.3.3 The strainer screen shall have a corrosion resistance at least equal to that of Type 300 series stainless ste
42、el.4.1.3.4 The seat ring in the valve body shall be of material having corrosion and erosion resistance at least equal to that of Type 300 series stainless steel.4.1.3.5 Bolts, nuts, and screws used in the assembly shall be made of corrosion-resistant material or have a corrosion-resistant coating.4
43、.1.3.6 The spring chamber or housing shall be made of corrosion-resistant material or have a corrosion-resistant coating.4.1.4 Other materialsAll other materials for which specific requirements are not provided in Clauses 4.1.1 to 4.1.3 shall be of a suitable quality for the intended service.4.2 Des
44、ign and construction4.2.1 General4.2.1.1 The device shall be self-contained, direct-acting, diaphragm-actuated, and adjustable.4.2.1.2 Construction shall be such that, during normal handling in transit and installation, the device will not be damaged in any way that will prevent it from functioning
45、as required. Cavities in flow passages that could entrap foreign materials shall be avoided, and the interior of the device shall be free of burrs. Devices shall be designed so that they do not produce excessive noise when subjected to any flow rate up to the manufacturers maximum flow rate.4.2.1.3
46、Metal-to-metal seating of valves shall not be used. Either the seat or the valve disc, or both, shall be of nonmetallic materials that will assure pressure-tight seating and reseating.4.2.2 Working pressures4.2.2.1 Devices shall be designed to function properly over the hydrostatic inlet pressure ra
47、nge, up to 1724 kPa.4.2.2.2 Devices shall have a minimum reduced pressure adjustment range of 175 kPa.4.2.3 Working temperatures4.2.3.1 GeneralDevices shall be designed to function properly over a temperature range of 1 to 60 C.(Replaces p. 4, August 2010)4Update No. 1B356-10March 2011Note: General
48、Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.Title: Water pressure reducing valves for domestic water supply systems originally published August 2010The following re
49、visions have been formally approved. The changes to the body of the Standard are marked by the symbol delta () in the margin. The change to the Preface applies to the English Standard only.Revised Outside front cover, title page, Preface, and Clause 7.3New National Standards of Canada textDeleted None Update your copy by inserting these revised pages. Keep the pages you remove for reference.CAN/CSA-B356-10A National Standard of Canada(approved March 2011)Water pressure reducing valves for domestic water supply sy
