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1、ASSE Standard #lo32 Issued: July, 1980 Amercun Society of Suntury Engneerng Performance Requirements for Dual Check Valve Type Backflow Preventers For Carbonated Beverage Dispensers = Post Mix Type Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=Un
2、iversity of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- General Information Neither this Standard, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering
3、. Although this Standard may be used as a benchmark for in-house evaluation, no product may be said to be A.S.S.E. approved unless the manufacturer has applied to the A.S.S.E., has had his product tested by an official A.S.S.E. recognized independent laboratory, according to the applicable A.S.S.E.
4、Stan- dard, and when the product has passed the test, displays the A.S.S.E. Seal on the product. Instructions for receiving the authorization to display the Seal are available from the A.S.S.E. Central Office. It is recommended that all devices designed for plumbing systems, especially those which p
5、ertain to public health and safety, should be installed consistent with local codes by qualified and trained professionals. American Society of Sanitary Engineering Bay Village, Ohio Copyright O 1980 All rights reserved. Dual Check Valve Type Backnow Prevenfer for Carbonafed Beverage Dispensers - Po
6、st Mix Types i ASSE#1032 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- II Dual Check Valve Type Back
7、tlow Preventer for Carbonated Beverage Dispensers - Post Mix Types ASSE #lo32 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without
8、 license from IHS -,-,- t-oreword The American Society of Sanitary Engineering for Plumbing and Sanitary Research is dedi- cated to the preservation of Public Health and Safety through “Prevention Rather than Cure.” Prevention of contamination or pollution of potable water in plumbing systems is one
9、 of the major objectives of the Societys Standards Program, which is addressed to the develop- ment and promulgation of Standards embracing performance criteria for manufactured plumb- ing components designed to safeguard Public Health and Safety. The recognition of probable sources or causes of con
10、tamination or pollution of a potable water system whereby it becomes unfit or undesirable for human consumption, is vital to the maintenance of its continued potability. While backflow into potable water lines is always a potential source of contamination, in connection with Post Mix Type Carbonated
11、 Beverage dispensers, backflow of C O , gas into copper piping of the potable water system causing copper poisoning is especially serious and must always be protected against. I This standard is focused on those devices known as Dual (Double) Check Valves, which are one type of device recognized for
12、 protection for use in connection with Post Mix Type Carbon- ated Beverage Dispensers. In addition to inclusion of this device in the system, periodic inspection and servicing of the device is essential. This standard is the latest addition to the current eight A.S.S.E. Backflow Preventer Stan- dard
13、s, each of which covers a different type of backflow protection device, each tailored to the protective requirements essential to the specific system conditions in which it is installed and the degree of hazard involved. The A.S.S.E. Sub-Committee in charge of developing this standard was set up in
14、compliance with, and authorized by, the Administrative Procedures for the A.S.S.E. Standards Committee. Dual Check Valve Type Backflow Preventer for Carbonated Beverage Dispensers - Post Mix Types iii ASSE#1032 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license wit
15、h ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- A.S.S.E. Standards Committee Valentine Lehr, P.E. Standards Committee Chairman Consulting Engineer, New York, New York Robert J. Anderson Alleg
16、hany County Health Department, Pittsburgh, Pennsylvania James R. Boates Plumbing Contractor, Boston, Massachusetts James C. Church, P.E. Coordinator and Vice-chairman Retired Consulting Engineer, Mamaroneck, New York Charles J. Hall Manufacturers Representative, Dallas, Texas William J. McNally Plum
17、bers Union, Cleveland, Ohio Lyle M. Reading, P.E. Retired Chief Sanitary Engineer, Detroit, Michigan Robert J. Tesar Senoir Vice-president, Watts Regulator Company, Lawrence, Massachusetts Morris H. Weinberg, P.E. Consulting Engineer, Philadelphia, Pennsylvania iv Dual Check Valve Type Backflow Prev
18、enter for Carbonated Beverage Dispensers - Post Mix Types ASSE #lo32 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license
19、from IHS -,-,- Su b-Committee James C. Church, P.E. Retired Consulting Engineer, Mamaroneck, New York Tom S. Gable National Sanitation Foundation, Ann Arbor, Michigan David E. Hartley National Automatic Merchandising Association, Chicago, Illinois Howard Hendricksen, P.E. Watts Regulator Co., Lawren
20、ce, Massachusetts Wylie W. Mitchell Retired Chief Plumbing Inspector, Atlanta, Georgia Russell B. Norriss Corneilius Company, Anoka, Minnesota Craig A. Swanson SITCO, San Antonia, Texas A. A. Schroeder Lancer Corporation, San Antonio, Texas Dual Check Valve Type Backflow Preventer for Carbonated Bev
21、erage Dispensers - Post Mix Types V ASSE #lo32 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- Table o
22、f Contents Section I 1 1 .O General . Construction 1 1.1 Scope 1 1.2 Purpose . 1 1 1.4 Materials 2 1.5 Instructions for Marking and Insta . 3 1.3 Limitation on Design . 1.6 Manufacturers Recommendations 3 Section II . 4 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Criteria and Procedures for Evaluation .
23、 Drawings . 4 Laboratory Testing 4 Figure 1 . 4 Deterioration at Extremes of Manufacturers Temperature Range 5 Hydrostatic Test of Complete Device 4 Figure 2 . 5 Endurance Cycling Test 5 Shock (Water Hammer) Test of the Device 5 Supplementary (Third) Check Valve . 6 Hydrostatic Leakage Tests of Chec
24、k Valves . 6 . 2.10 Drip Tightness of Check Valves 6 2.11 Flow and Pressure Loss 7 Section 111 8 3.0 Definitions 8 Vi Dual Check Valve Type Backflow Preventer for Carbonated Beverage Dispensers . Post Mix Types ASSE #lo32 1980 Copyright American Society of Sanitary Engineering Provided by IHS under
25、license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- Dual Check Valve Type Bac kf low Preven ters (For Carbonated Beverage Dispensers - Post Mix Types) 1.1.1 Class of Devices 1.1.1.1 Th
26、e devices covered by this standard are those with functional capabilities for preventing back pressure backflow in water supply lines, and which can operate under continuous or intermittent pressure conditions. 1.1.1 -2 These devices consist of two independently acting primary checkvalves, internall
27、y force loaded to a normally closed position, in a common casing or valve body. 1.1.1.3 Devices may have a supplementary check valve downstream of the primary downstream check valve. Where it is incorporated in the design, it shall be held open by suitable means or removed for all performance tests
28、where noted. 1.1.2 Size Inlet and outlet equivalent to 114“ or 318“ pipe size, or 114“ or 3/8“ S.A.E. 45 flare. 1 .i .3 Working Pressure The devices shall be designed for a working pressure of not less than 200 psi (1,379 kPa). 1.1.4 Temperature Range The devices shall be designed and constructed fo
29、r temperatures of 33F to 110F (SOC to 43C). To prevent carbon dioxide gas and carbonated water from backflowing into the potable water system which supplies the carbonating unit. 1.3.1 Flow Capacity 1.3.1.1 The waterway in the device shall be as free as possible from obstructions and pockets which c
30、ould interfere with the free flow of water. Dual Check Valve Type Backnow Preventer for Carbonated Beverage Dispensers - Post Mix Types 1 ASSE#1032 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale,
31、12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- 1.3.1.2 Flowways should be designed to reduce cavitation and pressure loss. 1.3.2 Structural Strength 1.3.2.1 All parts of the device shall be designed to withstand, without permanent distortion, the stress
32、es developed by the specified hydrostatic test pressure, as well as the stresses resulting from a specified water working pressure coincident with operation under a specified unbalanced pressure condition. 1.3.2.2 Design and construction shall be such that in normal handling, in transit and during i
33、nstallation, the device will not be damaged in any way which will prevent it from functioning as required. 1.3.3 Mechanical Function 1.3.3.1 Durability Design of the device shall comply with sound engineering practice and a life expectancy suitable for its application. 1.3.3.2 The moving parts shall
34、 have adequate clearance to prevent binding or galling, or to prevent the device from becoming inoperative by being thrown out of balance, by being distorted, by having one part interfere with another, or by becoming encrusted with lime, rust or scale deposits. 1.3.3.3 All moving parts shall be desi
35、gned to operate up to the rated flow without chatter or vibration. 1.3.3.4 The operation of the device shall not cause water hammer. 1.3.3.5 The design shall be such that the performance of the device will not be adversely affected by normal line pressure surges. 1.3.3.6 Leakage All joints shall be
36、watertight where subject to water pressure. 1.3.3.7 Misassembling The design shall be such that the parts cannot be easily misassembled. 1 m . 8 Female piping connections shall be so constructed that it will not be possible to run a pipe into them far enough to restrict the flow through the device o
37、r interfere with working parts. 1.3.3.9 Repairability The internal parts of the devices shall be accessible for inspection, repairs or replacements. 1.4.1 Reference to ASTM and ANSI Standards shall be to the latest editions. 1.4.2 Toxic Materials 1.4.2.1 Materials which could contaminate the water a
38、nd make it injurious to persons consuming it shall not be used in the device where the material would be in contact with the water. 1.4.2.2 All materials in contact with the water shall comply with the requirements of the Safe Drinking Water Act, PublicLaw93-523, National Interim Primary Drinking Wa
39、ter Regulations; and 2 Dual Check Valve Type Backnow Preventer for Carbonated Beverage Dispensers - Post Mix Types ASSE#1032 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MST
40、No reproduction or networking permitted without license from IHS -,-,- shall be so certified by the National Sanitation Foundation. 1.4.3 All metal parts which come into contact with the fluids within the device must be of chrome nickel stainless steel, series 300. All non-metallic parts which come
41、into contact with the fluids within the device shall be in full compliance with National Sanitation Foundation Standard 51 - Plastic Materials and Components used in Food Service Equipment. A bill of material fully describing all parts must be attached to the product performance certification report
42、. 1.4.4 Valve discs, seat facings or other flexible nonmetallic parts shall be designed for continuous exposure to water at the maximum rated operating temperature of the device without change in physical characteristics which would prevent full compliance with all requirements of the standard. 1.4.
43、5 Metal to metal seating of primary check valves is not acceptable. Either seat, valve disc or both shall be on non-metallic materials which will assure pressure tight seating and reseating. 1.4.6 Connections Inlet and outlet threads shall be in compliance with ANSI 82.1 orshall be flared S.A.E. 45
44、degrees. 1 S.1 Marking of Devices 1.5.1.1 Each device shall have marked on it in a place where it will be visible after the device has been installed, the following information: (a) Name of manufacturer or trademark. (b) Type and model number of the device. (c) Other marking consistent with the manu
45、facturers standard practice. (d) The direction of water flow through the device shall be shown. 1 S.1.2 The markings shall be either cast, etched, stamped or engraved on the body of the device or on a durable metal plate securely attached to the device. 1 S.2 Installation Instructions 1.5.2.1 Comple
46、te instructions for installation of the device must be packaged with it. Drawings or schematic sketches which would be useful to the installer should be part of these instructions. These instructions must provide all information necessary to allow a correct installation. 1.5.2.2 It is recommended th
47、at a suitable strainer be installed upstream of the device. 1.5.2.3 For all devices capable of being maintained or repaired in the field, complete detailed instructions shall be furnished. 1 S.3 Installation Recommendations 1 S.3.1 The device shall not be installed in an inaccessible location. Manuf
48、acturers recommendations for service testing the checkvalves shall be furnished. Dual Check Valve Type Backflow Preventer for Carbonated Beverage Dispensers - Post Mix Types 3 ASSE #f032 1980 Copyright American Society of Sanitary Engineering Provided by IHS under license with ASSE Licensee=University of Texas/5626000001 Not for Resale, 12/24/2006 00:35:18 MSTNo reproduction or networking permitted without license from IHS -,-,- Assembly drawings and other data which are needed to enabl