1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1478 Fire Pump Relief ValvesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO
2、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fire Pump Relief Valves, UL 1478 Fourth Edition, Dated May 13, 2004 Summary of Topics This revision to ANSI/UL 1478 is being issued to reect the reaffirmation of ANSI approval of the Standard. No technical changes have bee
3、n 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. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publi
4、cation or the date on which the changed requirement becomes effective. The revised requirements are substantially in accordance with Proposal(s) on this subject dated November 9, 2012. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in
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9、e 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 requirements that have been revised and that have a future effective date are located after the Standard, and are preced
10、ed by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 8, 2013 UL 1478 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 8, 2013 UL 1478 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT
11、ION WITHOUT PERMISSION FROM UL MAY 13, 2004 (Title Page Reprinted: February 8, 2013) 1 UL 1478 Standard for Fire Pump Relief Valves First Edition August, 1980 Second Edition April, 1989 Third Edition July, 1995 Fourth Edition May 13, 2004 This ANSI/UL Standard for Safety consists of the Fourth Editi
12、on including revisions through February 8, 2013. The most recent designation of ANSI/UL 1478 as a Reaffirmed American National Standard (ANS) occurred on February 8, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comm
13、ents or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via 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 elect
14、ronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 1478-2004 (R2013)UL COPYRIGHTED MATERIAL NOT AUTH
15、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 13, 2004 FIRE PUMP RELIEF VALVES - UL 1478 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Components 4 3
16、 Units of Measurements 4 4 Undated References 5 5 Glossary .5 CONSTRUCTION 6 Sizes 5 7 Maximum Set Pressure Rating .5 8 Bodies and Bonnets .5 9 Materials .6 10 Valve Mechanisms .6 11 Clearances 7 PERFORMANCE 12 General .7 13 Metallic Materials 7 14 Elastomeric Parts (Except Gaskets) Test .7 15 Leaka
17、ge Test 8 16 Hydrostatic Strength Test .8 17 Operation and Reseat Test .8 18 Flow Capacity Test .8 19 Cycling Test .9 MANUFACTURING AND PRODUCTION TESTS 20 General .9 MARKINGS 21 General 10 INSTRUCTIONS 22 Installation Instructions and Capacity Data .11 MAY 13, 2004 FIRE PUMP RELIEF VALVES - UL 1478
18、 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover direct acting (spring loaded) and pilot operated re pump relief valves of nominal 3/4 inch (19.05 mm) size and larger, intended for use in wa
19、ter supply systems for re protection service. 1.2 Requirements for the installation and use of these valves are included in the Standard for the Installation of Centrifugal Fire Pumps, NFPA 20. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall compl
20、y 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 the component in the product covered by this standard, or b) Is superseded by a requirement in this standar
21、d. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 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
22、temperatures not exceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurements 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. MAY 13, 2004 FIRE PUMP RELIEF VALVES - UL 1478 4UL COP
23、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5
24、 Glossary 5.1 For the purpose of this standard, the following denitions apply. 5.2 MAIN VALVE The part of the valve assembly that controls the ow of water. 5.3 MAXIMUM SET PRESSURE RATING The maximum pressure at which the valve is intended to be set to relieve pressure from a water supply system. 5.
25、4 PILOT VALVE The part of the valve assembly that controls the operating of the main valve. 5.5 RESEAT PRESSURE The internal pressure at which the relief valve is intended to prevent the ow of water. 5.6 SET PRESSURE The internal pressure at which the main valve is intended to start to allow the ow
26、of water. CONSTRUCTION 6 Sizes 6.1 Valve sizes refer to the nominal diameter of the waterway through the end connections and to the nominal pipe trade size for which the end connections are intended. The diameter of the waterway through the seat of a valve may be reduced below that of the waterway t
27、hrough the end connections. 7 Maximum Set Pressure Rating 7.1 A valve shall be constructed for a maximum set pressure rating of 175 psi (1200 kPa) or higher. 8 Bodies and Bonnets 8.1 A valve body casting of the globe or angle pattern shall be smooth, free from porosity, scale, lumps, cracks, blister
28、s, sand holes, and defects of any nature which may impair its intended operation. A casting shall not be plugged or lled, but impregnation to remove porosity, using material insoluble to the liquid handled, is acceptable. 8.2 The dimensions of a ange, ange pipe joint, and threaded body opening shall
29、 comply with the requirements of the following standards: a) Pipe Threads, General Purpose (Inch) ANSI/ASME B1.20.1; b) Dry Seal Pipe Threads (Inch) ANSI/ASME B1.20.3; and c) Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800 ANSI/ASME B16.1 MAY 13, 2004 FIRE PUMP RELIEF VALVES
30、 - UL 1478 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.3 The bolting of pressure-holding castings shall be such that the maximum stress on any bolt will not exceed one-fourth the elastic limit of the material. The load on the bolts is
31、 to be computed on the basis of the valves maximum set pressure rating. The area of application of pressure is to be calculated as follows: a) If a full face gasket is used, the area of force application is that area extending out to a line dened by the inner edge of the bolts. b) If an O ring seal
32、or ring gasket is used, the area of force application is that area extending out to the center line of the O ring or gasket. 9 Materials 9.1 A part that bears against, rotates within, or slides on stationary parts, and that must be free to move during valve operation, shall be made of compatible cor
33、rosion-resistant materials, or shall be tted with bushings, inserts, or other parts made of these corrosion-resistant materials at those points where freedom of motion is required. 9.2 An interior bolt or screw shall be made of bronze or other corrosion-resistant material. 9.3 An internal spring use
34、d in a re pump relief valve shall be made of material having corrosion resistance equivalent to that of phosphor bronze and shall not be susceptible to stress corrosion. 10 Valve Mechanisms 10.1 An internal working part which may be removed during intended maintenance shall be removable without dama
35、ging the valve and without requiring the use of special tools. 10.2 A valve part that is disassembled in eld servicing shall be of a form that permits its accurate reassembly. 10.3 All parts within the valve shall be secured so they will resist separation in intended use. 10.4 A diaphragm-operated v
36、alve shall incorporate a check valve or equivalent in the trim to prevent air from entering the diaphragm chamber. 10.5 A diaphragm-operated valve shall have a pressure gauge to determine the pressure in the diaphragm chamber. A tapped opening of not less than 1/4 inch pipe size in the valve cover s
37、hall be used to accommodate the pressure gauge. 10.6 If an orice with a diameter less than 3/16 inch (4.8 mm) is used in the trim or operation of a valve, a screen or strainer with corrosion resistance equivalent to brass shall be provided. The total area of the openings in the screen or strainer sh
38、all be not less than 20 times the cross-sectional area of the opening that the screen or strainer is intended to protect. The largest dimension of the screen or strainer openings shall not exceed 1/32-inch (0.8-mm) less than the diameter of the protected orice. MAY 13, 2004 FIRE PUMP RELIEF VALVES -
39、 UL 1478 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 11 Clearances 11.1 Clearances shall be provided between working parts, and between working and stationary parts, so that corrosion or deposits of foreign matter within an assembly doe
40、s not result in sluggish action or otherwise impaired operation of the valve. 11.2 The clearance between a valve disc or a part attached thereto and the inside walls of iron body castings in every position of the valve disc, except fully open, shall be not less than 1/2 inch (12.7 mm). This clearanc
41、e shall be not less than 1/4 inch (6.4 mm) for valves having bodies of bronze or equivalently corrosion-resistant material. PERFORMANCE 12 General 12.1 Representative samples of each size re pump relief valve shall be subjected to the tests described in these requirements. 12.2 Test bars of metal us
42、ed in castings and additional samples of parts constructed of nonmetallic materials, such as valve seat discs, are required for physical tests. 13 Metallic Materials 13.1 Specimen bars of metals used shall be prepared from the same heat or run of metal used in the bodies and covers of valve samples
43、submitted for investigation and test. The specimen bars shall comply with the requirements specied in 20.1(a). 14 Elastomeric Parts (Except Gaskets) Test 14.1 An elastomeric part used to provide a seal shall have the following properties when tested as specied in the Standard for Gaskets and Seals,
44、UL 157: a) For silicone rubber (having poly-organo-siloxane as its constituent characteristic), a minimum tensile strength of 500 psi (3.4 MPa) and a minimum ultimate elongation of 100 percent. b) For natural rubber and synthetic rubber other than silicone rubber, a minimum tensile strength of 1500
45、psi (10.3 MPa) and minimum ultimate elongation of 150 percent; or a minimum tensile strength of 2200 psi (15.2 MPa) and a minimum ultimate elongation of 100 percent. c) Those properties relating to maximum tensile set; minimum tensile strength and elongation after oven aging; and hardness after oven
46、 aging, all as specied in UL 157. The maximum service temperature used to determine the oven time and temperature for oven aging is considered to be 60C (140F). 14.2 The Standard for Gaskets and Seals, UL 157, provides for the testing of either nished elastomeric parts or sheet or slab material. She
47、et or slab material is to be tested when the elastomeric parts are O-rings having diameters of less than 1 inch (25.4 mm). The material tested is to be the same as that used in the product, regardless of whether nished elastomeric parts or sheet or slab material is tested. MAY 13, 2004 FIRE PUMP REL
48、IEF VALVES - UL 1478 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 15 Leakage Test 15.1 A re pump relief valve shall withstand for 1 minute without leakage an internal hydrostatic pressure equal to 90 percent of the set pressure. 15.2 The
49、 valve is to be tested for leakage at both the minimum and maximum set pressure limits. 16 Hydrostatic Strength Test 16.1 An assembled valve including the main valve, pilot valve, and trim shall withstand, for 1 minute without rupture, an internal hydrostatic pressure equal to 280 percent of the maximum set pressure rating of the valve. 17 Operation and Reseat Test 17.1 The pressures at which the main valve opens, when the valve is adjusted to a minimum of four different pressur
