1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 312 Check Valves for Fire-Protection ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED F
2、OR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Check Valves for Fire-Protection Service, UL 312 Tenth Edition, Dated September 30, 2010 Summary of Topics This revision to ANSI/UL 312 is being issued to reect the reaffirmation of the ANSI approval of the
3、 Standard. No technical changes have been made to the document. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Proposal(s) on this subject dated January 16, 2015
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5、er expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages
6、arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users o
7、f the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electr
8、onic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for req
9、uirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. MARCH 20, 2015 UL 312 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 20, 2
10、015 UL 312 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2010 (Title Page Reprinted: March 20, 2015) 1 UL 312 Standard for Check Valves for Fire-Protection Service First Edition March, 1931 Second Edit
11、ion September, 1951 Third Edition November, 1964 Fourth Edition May, 1973 Fifth Edition May, 1975 Sixth Edition April, 1980 Seventh Edition December, 1988 Eighth Edition June, 1993 Ninth Edition January, 2004 Tenth Edition September 30, 2010 This ANSI/UL Standard for Safety consists of the Tenth Edi
12、tion including revisions through March 20, 2015. The most recent designation of ANSI/UL 312 as a Reaffirmed American National Standard (ANS) occurred on March 20, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. The Dep
13、artment of Defense (DoD) has adopted UL 312 on August 10, 1989. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted v
14、ia a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regardin
15、g those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 312-2010 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION S
16、ERVICE - UL 312 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated References 6 5 Glossary .6 CONSTRUCTION 6 General 7 7 Rated Pressures 7
17、 8 Metallic Materials .7 9 Bodies and Covers 7 10 Valve Mechanisms .8 11 Clapper Supports 9 12 Clapper Stops 10 13 Seats 10 14 Clearances .11 PERFORMANCE 15 General 11 16 Cycling Test 12 17 Nonmetallic Materials Test .12 17.1 General .12 17.2 Plastic parts .12 17.3 Elastomeric parts (except gaskets)
18、 .13 18 Adhesion Test for Resilient Seat Materials .13 19 Disbondment Test 16 20 Leakage Test 16 21 Strength of Body Test .16 22 Hydraulic Friction Loss Test 17 23 Detector Check Valve Differential Test 17 MANUFACTURING AND PRODUCTION TESTS 24 General .17 MARKING 25 General 18 APPENDIX A CLEARANCES
19、MEASUREMENT REFERENCE A1 General .A1 A1.1 Bushing dimensions A1 A1.2 Radial clearances A2 A1.3 Diametrical clearances .A2 SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION SERVICE - UL 312 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL A
20、1.4 Total axial clearances A2 A1.5 Body clearances .A4 A1.6 Clapper clearances A5 SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION SERVICE - UL 312 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requiremen
21、ts cover check valves of 1 NPS and larger, used in piping systems supplying water for re protection service. 1.2 The check valves covered by these requirements are intended for installation and use in accordance with the Standards for: a) Low-, Medium-, and High-Expansion Foam, NFPA 11; b) Installat
22、ion 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) Installation of Foam-Water Sprinkler and Foam-Water Spray Systems, NFPA 16; f) Installation of Stationary Pumps For Fire Protection, NFPA 20; g) Wa
23、ter Tanks for Private Fire Protection, NFPA 22; h) Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24; i) Water Mist Fire Protection Systems, NFPA 750; and j) Installation of Sprinkler Systems in Residential Occupancies Up to and Including Four Stories in Height, NFPA 13R. 2
24、 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of th
25、e component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION SERVICE - UL 312 5UL COPYRIGHTED
26、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not e
27、xceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated reference to a code or standard appe
28、aring in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purposes of this standard, the following denitions apply. 5.1.1 CHECK VALVE A self- acting device that is designed to allow uid ow in one direction. 5.1
29、.2 DETECTOR CHECK VALVE A check valve equipped with a bypass around the valve to allow relatively small ows without operation of the valve. The bypass allows installation of a water meter to record a small usage of water. 5.1.3 NPS (NOMINAL PIPE SIZE) A dimensionless designator for pipe sizes used t
30、o replace terms such as nominal diameter and nominal size . Dened in standards including in the: a) Standard Specication for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, ASTM A 53/A 53M; b) Standard Specication for Electric-Resistance-Welded Steel Pipe, ASTM A 135/A 135M; and
31、 c) Standard Specication for Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless Steel Pipe for Fire Protection Use, ASTM A 795/A 795M. 5.1.4 POPPET CHECK VALVE A check valve incorporating a disc, clapper, or plug that moves uniformly away from or towards the valve seat. 5.1.5 SPLIT CL
32、APPER CHECK VALVE A check valve incorporating a split-disc type clapper that pivots about a hinge pin located approximately in the center of the waterway. 5.1.6 SWING CHECK VALVE A check valve incorporating a single clapper that rotates about a xed location. These valves are manufactured with screwe
33、d, anged, grooved pipe connections. 5.1.6 effective December 21, 2010 5.1.7 WAFER CHECK VALVE A check valve having outside body and end connection dimensions that are less than the inside diameter of the bolt pattern of anges of the same nominal pipe size. One set of ange studs long enough to span t
34、he valve is used to clamp the wafer check valve between its mating anges. SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION SERVICE - UL 312 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 6 General 6.1 Valve sizes refer to t
35、he nominal diameter of the waterway through the end connections and to the nominal pipe size for which the end connections are intended. The diameter of the waterway through the seat ring of a valve may be reduced below that of the waterway through the end connections. 7 Rated Pressures 7.1 A check
36、valve of 12 NPS or smaller shall be constructed for a minimum rated pressure of 175 psig (1.2 MPa). 7.2 A check valve of a size larger than 12 NPS shall be constructed for a minimum rated pressure of 150 psig (1.0 MPa). 8 Metallic Materials 8.1 Metallic materials used in check valve samples submitte
37、d for investigation and test shall conform to the minimum physical property requirements of the latest edition of the applicable ASTM or equivalent material standard, as specied by the manufacturer. 9 Bodies and Covers 9.1 A body and cover shall be made of a material having strength and corrosion re
38、sistance at least equivalent to cast iron. 9.2 A casting shall not be plugged or lled, but may be impregnated to remove porosity. 9.3 The dimensions of all anges, ange pipe joints, and threaded body openings shall conform to the following standards, as applicable. The ange class shall be at least eq
39、ual to the rated pressure of the valve. a) Standard for Pipe Threads, General Purpose (Inch), ANSI/ASME B1.20.1. b) Standard for Dryseal Pipe Threads (Inch), ANSI/ASME B1.20.3. c) Standard for Gray Iron Pipe Flanges and Flanged Fittings (Classes 25, 125, and 250), ANSI/ ASME B16.1 (Class 125 or high
40、er). d) Standard for Steel Pipe Flanges for Waterworks Service Sizes 4 In. Through 144 In. (100 mm Through 3,600 mm), ANSI/AWWA C207, for valves having a maximum rated pressure of 175 psig (1.2 MPa); and the Standard for Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard,
41、ANSI/ASME B16.5, for valves having a maximum rated pressure greater than 175 psig. e) Mechanical joint or push-on joint ends for Waterworks Service, in the Standard for Rubber- Gasket Joints for Ductile-Iron Pressure Pipe and Fittings, ANSI/AWWA C111/A21.11. f) Standard for Grooved and Shouldered Jo
42、ints, ANSI/AWWA C606. 9.3 effective December 21, 2010 SEPTEMBER 30, 2010 CHECK VALVES FOR FIRE-PROTECTION SERVICE - UL 312 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9.4 A wafer check valve shall be constructed to t between anges made
43、in accordance with the requirements for Class 125 or higher anges in the American National Standard for Gray Iron Pipe Flanges and Flanged Fittings (Classes 25, 125, and 250), ANSI/ASME B16.1. 9.5 Check valves shall be constructed to be eld serviced. A check valve weighing more than 60 pounds (27 kg
44、) shall be provided with an access cover, lifting lug, or an eyebolt to facilitate servicing. Exception: Check valves in sizes 2-1/2 NPS and smaller may be constructed without having provisions for eld servicing. 9.6 The load on any bolt shall not exceed the minimum tensile strength specied in Table
45、 II of the Standard Specication for Carbon Steel Bolts and Studs, 60,000 Psi Tensile Strength, ASTM A307, when the valve is at the test pressure specied in 21.1. The area of the application of pressure is to be calculated as follows: a) To an area dened by a line contacting the inner portion of the
46、bolt holes when a full-face gasket is used, or b) To the centerline of the O ring or gasket, when an O ring or gasket is used. 10 Valve Mechanisms 10.1 Internal working parts that are removed during intended maintenance shall be removable without damaging the valve and without requiring the use of s
47、pecial tools. 10.2 A valve part that is intended to be disassembled during eld servicing shall be constructed such that it cannot be reassembled in an unintended manner. 10.3 A part that bears against, rotates within, or slides on stationary parts, and that must be free to move during valve operatio
48、n shall either: a) Be made of corrosion-resistant material, such as bronze, brass, chrome-plated bronze, monel metal, or the like; or b) Be tted with bushings, inserts, or other parts made of the corrosion-resistant materials specied in (a) at those points where freedom of motion is required. 10.4 A
49、n interior bolt or screw shall be made of bronze or other equally or more corrosion-resistant material. 10.5 An internal spring used in a check valve shall be made of material having corrosion resistance equivalent to phosphor bronze and shall be capable of at least 50,000 cycles of intended operation. See Cycling Test, Section 16. 10.6 All parts within the valve shall be secured so that the parts cannot separate in use. SEPTEMBER 30, 2010 CHECK VALVES
