1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 1469Strength of Body and HydraulicPressure Loss Testing ofBackflow Special CheckValvesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULU
2、L COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL Standard for Safety for Strength of Body and Hydraulic Pressure Loss Testing of Backflow SpecialCheck Valves, UL 1469Second Edition, Dated December 7, 2006Summary of TopicsThese revisions are b
3、eing issued to:Revise the Hydrostatic Test Pressure in the Strength of Body Test,Make Corrections and add a valve size to Table 6.1 andInclude undated reference requirements.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by
4、 any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.UL provides this Standard as is without warranty of any kind, either expressed or implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.In no ev
5、ent will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of
6、thepossibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid forthis Standard, regardless of the form of the claim.Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expen
7、se, liability, damage, claim, or judgment (including reasonableattorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers computer system.The requirements in this Standard are now in effect, except for those paragraphs, section
8、s, tables, figures,and/or other elements of the Standard having future effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the Standard, and are preceded by a SUPERSEDED REQ
9、UIREMENTS notice.Text that has been changed in any manner or impacted by ULs electronic publishing system is markedwith a vertical line in the margin. Changes in requirements are marked with a vertical line in the marginand are followed by an effective date note indicating the date of publication or
10、 the date on which thechanged requirement becomes effective.The revised requirements are substantially in accordance with Proposal(s) on this subject dated October30, 2009.The following table lists the future effective dates with the corresponding reference.MARCH 19, 2010 UL 1469 tr1UL COPYRIGHTED M
11、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFuture Effective Date ReferenceMarch 19, 2010 Paragraphs 1.1, 2.2, 2A.1, 2A.2, 5.1; Tables 5.1 6.1MARCH 19, 2010 UL 1469tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT P
12、ERMISSION FROM ULDECEMBER 7, 2006(Title Page Reprinted: March 19, 2010)1UL 1469Standard for Strength of Body and Hydraulic Pressure Loss Testing ofBackflow Special Check ValvesFirst Edition May, 1995Second EditionDecember 7, 2006Comments or proposals for revisions on any part of the Standard may bes
13、ubmitted to UL at any time. Proposals should be submitted via a ProposalRequest in ULs On-Line Collaborative Standards Development System (CSDS)at http:/.COPYRIGHT 2010 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FRO
14、M ULMARCH 19, 2010UL 14692No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 General 52A Glossary 5CONSTRUCTION3 General 54 Rated Pressure .6PERFORMANCE5 Strength of Body Test .66 Hydraulic Pres
15、sure Loss Test 67 Flow Performance Information 7MANUFACTURING AND PRODUCTION TESTS8 General 8MARKING9 General 8MARCH 19, 2010 UL 1469 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover backflow spe
16、cial check valves of 3/4 through 12 NPS (nominal pipe size)used in piping systems supplying water for fire protection service.1.1 revised March 19, 20101.2 The backflow special check valves covered by these requirements are intended for installation anduse in accordance with the Standards for:a) Low
17、 Expansion Foam and Combined Agent Systems, NFPA 11;b) Installation of Sprinkler Systems, NFPA 13;c) Installation of Standpipe and Hose Systems, NFPA 14;d) Water Spray Fixed Systems for Fire Protection, NFPA 15;e) Deluge Foam-Water Sprinkler and Spray Systems, NFPA 16;f) Installation of Centrifugal
18、Fire Pumps, NFPA 20;g) Water Tanks for Private Fire Protection, NFPA 22; andh) Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24.1.3 A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements i
19、n this standard and that involve a risk of fire, electric shock, orinjury to persons shall be evaluated using the appropriate additional component and end-productrequirements as determined necessary to maintain the acceptable level of safety as originally anticipatedby the intent of this standard. A
20、 product whose features, characteristics, components, materials, orsystems conflict with specific requirements or provisions of this standard cannot be judged to comply withthis standard. Where considered appropriate, revision of requirements shall be proposed and adopted inconformance with the meth
21、ods employed for development, revision, and implementation of this standard.MARCH 19, 2010UL 14694UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2 General2.1 If a value for measurement is followed by a value in other units in parentheses, the
22、 second value maybe only approximate. The first stated value is the requirement.2.2 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.2.2 added March 19, 20102A Glossary2A added M
23、arch 19, 20102A.1 For the purpose of this standard, the following definitions apply.2A.1 added March 19, 20102A.2 NPS (NOMINAL PIPE SIZE) A dimensionless designator for pipe sizes. Defined in standardsincluding the Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
24、Seamless, ASTM A 53/A 53M; the Standard Specification for Electric-Resistance-Welded Steel Pipe,ASTM A 135/A 135M; and the Standard Specification for Black and Hot-Dipped Zinc-Coated(Galvanized) Welded and Seamless Steel Pipe for Fire Protection Use, ASTM A 795/A 795M; used toreplace terms such as “
25、Nominal Diameter” and “Nominal Size.”2A.2 added March 19, 2010CONSTRUCTION3 General3.1 Valve sizes refer to the nominal diameter of the waterway through the end connections and to thenominal pipe size for which the end connections are intended. The diameter of the waterway through thevalve may be re
26、duced below that of the waterway through the end connections.3.2 Backflow special check valves shall be provided with either:a) An indicating type gate valve at each valve end; orb) A marking referencing an indicating type gate valve conforming to the Standard for GateValves for Fire-Protection Serv
27、ice, UL 262, that is to be provided at installation. See 9.5.Exception: Backflow special check valves can be provided with attached indicating type system controlvalves, such as butterfly valves, if both valves have been tested for friction loss.MARCH 19, 2010 UL 1469 5UL COPYRIGHTED MATERIAL NOT AU
28、THORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Rated Pressure4.1 A backflow special check valve shall be constructed for a minimum rated pressure of 175 psig (1.24MPa).PERFORMANCE5 Strength of Body Test5.1 An assembled backflow special check valve, including trim and by
29、pass components, shall withstand,without rupture, an internal hydrostatic test pressure equal to four times the rated pressure for a period offive minutes. During this test, the valve clapper is to be blocked open and bypass valves are to be in theopen position to impress the test pressure on all pa
30、rts of the valve assembly subject to rated pressure.5.1 revised March 19, 2010Table 5.1Hydrostatic test pressureTable 5.1 deleted March 19, 20105.2 The hydrostatic pressure test for strength of body castings, flanges, covers, and the like, is notconsidered a test for gaskets or seals. Gaskets used w
31、ith castings or parts having large areas may bereinforced. Other materials that can withstand the pressure may be substituted for regularly used gasketsand seals.6 Hydraulic Pressure Loss Test6.1 Pressure losses for a backflow special check valve shall be determined from zero (0) flow toapproximatel
32、y 150 percent of the rated flow specified in Table 6.1, and back to zero (0).Table 6.1Rated flows for backflow special check valvesTable 6.1 revised March 19, 2010Valve size (nominal), Rated flow,inches gpm (L/s)3/4 30 (1.89)1 50 (3.15)1-1/4 75 (4.73)1-1/2 100 (6.31)2 160 (10.09)2-1/2 225 (14.20)3 3
33、20 (20.19)4 500 (31.55)6 1000 (63.09)8 1600 (100.94)10 2300 (145.11)12 3000 (189.27)6.2 Each backflow special check valve is to be tested with all associated trim and bypass componentsand with the intended indicating type system control valves.MARCH 19, 2010UL 14696UL COPYRIGHTED MATERIAL NOT AUTHOR
34、IZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.3 To determine the valve differential at zero (0) flow, the valve assembly is to be filled with water andvented of all entrapped air. Transparent tubes are to be attached upstream and downstream of the valveand extended in a ve
35、rtical position. The tube downstream of the valve is to be filled with water to a levelof 6 in. above the highest point of the valve body assembly. The tube upstream of the valve is to be slowlyfilled with water until leakage past the valve check assembly occurs as evidenced by a drop in the levelof
36、 water in the upstream tube. The difference in water level between the upstream and downstream tubesat the point of valve leakage is considered the differential. Other means to measure valve differential maybe used if found to produce equivalent results to the procedure described herein.MARCH 19, 20
37、10 UL 1469 6AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMARCH 19, 2010UL 14696BNo Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.4 The sample backflow special ch
38、eck valve is then to be installed in its intended position in a test pipingsystem. The test line is to be equipped with calibrated flow measuring devices by which selected rates offlow can be established. A differential mercury manometer, or equivalent, is to be connected betweenpiezometer fittings
39、located upstream and downstream from the test valve to determine the measurementof the pressure loss through the valve.6.5 Starting with the valve closed, a shutoff valve installed downstream of the valve is to be slowlyopened, flow and pressure loss measurements are to be taken immediately after th
40、e backflow check valveassembly opens and at various points up to approximately 150 percent of rated flow when the incrementalpressure loss from the previous reading changes more than 0.5 psi but not greater than 1.0 psi. However,at least 10 pressure loss and flow measurement readings are to be taken
41、.6.6 If the friction losses in the piping are not known, the sample valve then is to be removed from the testpiping and the loss-of-pressure for test piping located between the piezometer fittings is to be determinedfor the same rates of flow. The pressure for the backflow special check valve then i
42、s to be determined bysubtracting the losses over the piping alone from the losses over the piping and valve.7 Flow Performance Information7.1 Flow performance information which is to accompany each valve, is to be used as a guide in theexamination and tests. For this purpose, a final printed version
43、 of the instructions is not required.7.2 The flow performance information shall include at least the following:a) Identification of models and sizes.b) Intended operating position; horizontal, vertical, or both horizontal and vertical.c) Rated pressure.d) Rated flow for each size.e) Pressure loss vs
44、. flow characteristics for each size valve from zero (0) flow up toapproximately 150 percent of rated flow.DECEMBER 7, 2006 UL 1469 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMANUFACTURING AND PRODUCTION TESTS8 General8.1 The manufacture
45、r shall provide the necessary production control, inspection, and tests.8.2 The program shall include at least factory testing of each valve for body strength. Each test is to beconducted at twice the rated pressure, and the pressure is to be held as long as necessary to determineacceptability, but
46、in no case less than 15 seconds. There shall be no leakage through the body or cover,and no distortion. Other test arrangements may be considered and accepted if found to achieve equivalentresults.MARKING9 General9.1 A backflow special check valve shall be marked with the following:a) Name or identi
47、fying symbol of the manufacturer or private labeler.b) Nominal size of valve.c) Distinctive model number, catalog designation, or the equivalent.d) Rated pressure.e) Year of manufacture. A valve produced in the last three months of a calendar year may bemarked with the following year as the date of
48、manufacture. A valve produced in the first sixmonths of a calendar year may be marked with the previous year as the date of manufacture.f) Arrow showing direction of flow.g) Intended position of installation, such as Horizontal or Vertical.Exception: If the valve is installed in either position, the
49、 marking of the position is not required.9.2 The markings specified in 9.1 (a) (e) and (g) shall be included on the body or cover casting usingone of the following methods:a) Cast letters and figures at least 3/8 inch (9.5 mm) high and raised at least 0.030 inch (0.8mm) above or recessed at least 0.050 inch (1.3 mm) below the surface of the body or cover.b) Etched or stamped on corrosion resistant metal nameplate permanently mounted on thevalve body or cover plate using letters at least 3/16 inch (4.8 mm) high and at least 0.005 inch(0.13 mm)
