1、UL 1726 ISBN 0-7629-0678-2 Automatic Drain Valves for Standpipe Systems APRIL 18,2001 - UL 1726 trl Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook. IL 60062-2096 UL Standard for Safety for Automatic Drain Valves for Standpipe Systems, UL 1726 Third Edition, Dated April 18, 2001 Th
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16、n this Standard are now in effect, except for those paragraphs, sections, tables, figures, 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
17、 date are located after the Standard, and are preceded by a ”SUPERSEDED REQUIREMENTS” notice. New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unle
18、ss the applicant specifically requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing and Follow-Up Services af
19、ter the effective date, and understanding of this should be signified in writing. Copyright O 2001 Underwriters Laboratories Inc. This Standard consists of pages dated as shown in the following checklist: Page Date 1-10 ApriIl8,2001 APRIL 18, 2001 1 UL 1726 Standard for Automatic Drain Valves for St
20、andpipe Systems First Edition - October, 1985 Second Edition September, 1993 Third Edition April 18, 2001 An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc. Revisions of this Standard will be made by issuing revised or
21、 additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements. ISBN 0-7629-0678-2 COPYRIGHT O 1985, 2001 UNDERWRITERS LAB
22、ORATORIES INC. 2 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS - UL 1726 APRIL 18, 2001 No Text on This Page APRIL 18. 2001 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS . UL 1726 3 CONTENTS FOREWORD 4 INTRODUCTION 1 Scope . 5 2 Units of Measurement . 5 3 Components 5 4 Undated References 6 CONSTRUCTI
23、ON 5 General 6 6 Valve Inlets 6 7 Valve Outlets and Threads . 7 PERFORMANCE 8 Valve Closing Test 7 9 Valve Opening Test . 7 10 Body Leakage Test 8 1 1 Strength of Body Test 8 12 Seat Leakage Test . 8 13 Pressure Cycling Test 8 MARKING 14 General . 8 4 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS - U
24、L 1726 APRIL 18, 2001 FOREWORD A. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below and in the Scope section of this Standard. These requirements are based upon sound
25、engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufacturers, users, inspection authorities, and others having specialized experience. They
26、 are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturers product. C. A product which complies with the text of
27、this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have other features which impair the level of safety contemplated by these requirements. D. A product employing materials or having forms of construction which conflict with specific
28、 requirements of the Standard cannot be judged to comply with the Standard. A product employing materials or having forms of construction not addressed by this Standard may be examined and tested according to the intent of the requirements and, if found to meet the intent of this Standard, may be ju
29、dged to comply with the Standard. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment given with due consideratio
30、n to the necessary limitations of practical operation and state of the art at the time the Standard is processed. UL shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including consequential damages
31、, arising out of or in connection with the use, interpretation of, or reliance upon this Standard. F. Many tests required by the Standards of UL are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting such tests. APRIL 18, 2001 AUTOMATIC DRAIN VALV
32、ES FOR STANDPIPE SYSTEMS - UL 1726 5 INTRODUCTION 1 Scope 1.1 These requirements cover automatic drain valves that are intended to drain water from cavities in standpipe systems intended usually to be empty, such as those between a hose valve and hose rack, and pipe sections between fire department
33、connections and check valves. 1.2 The valves covered by these requirements are intended for installation and use in accordance with the Standard for the Installation of Sprinkler Systems, ANSVNFPA 13-1999, and The Standard for the Installation of Standpipe, Private Hydrant, and Hose Systems, ANSI/N
34、FPA 14-2000. 2 Units of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3 Components 3.1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with the requirements for that
35、component. 3.2 A component is not required to comply with a specific 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 standard. 3.3 A component shall be use
36、d in accordance with its rating established for the intended conditions of use. 3.4 Specific 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 exceeding sp
37、ecified limits, and shall be used only under those specific conditions. 6 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS - UL 1726 APRIL 18, 2001 Nominal size, inches 1 I2 314 1 4 Undated References Outside diameter Inches (mm) 0.840 (21.34) 1 .O50 (26.67) 1.315 (33.40) 4.1 Any undated reference to a
38、code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 5 General 5.1 A valve shall be made of brass, bronze, or equivalent corrosion resistant material. 6 Valve Inlets 6.1 A valve for use with hos
39、e valves shall be fitted with a swivel. 6.2 The width of a gasket recess in a swivel shall be 3/16 inch (4.8 mm) for 1-1/2 inch (38.1 mm) nominal size couplings, 1/4 inch (6.4 mm) for 2-1/2 inch (63.5 mm) nominal size couplings, and 5/16 inch (7.9 mm) for 3 inch (76.2 mm) nominal size and larger cou
40、plings. See Table 6.1. Table 6.1 Nominal valve size dimensions 1-112 2-112 3 1.900 2.875 3.500 (48.26) (73.03) (88.90) 6.3 A threaded valve inlet and swivel shall have at least three V-shaped grooves in the grooved surface securing the swivel to the tail piece. 6.4 The wire component of a valve inle
41、t that utilizes a wire-groove and swivel shall have a round or square cross-section, and shall be fitted smoothly into the grooves of the swivel and valve. 6.5 For a valve inlet having an interlock and swivel, the depth of the groove or overlapping surface of the flange of the swivel shall not be le
42、ss than 3/32 inch (2.4 mm). 6.6 A swivelled valve inlet shall be provided with a resilient gasket fitted accurately into the recess of the swivel. The gasket shall be 1/8 inch (3.2 mm) thick for 1-1/2 inch (38.1 mm) nominal size couplings, 3/16 inch (4.8 mm) thick for 2-1/2 inch (63.5 mm) nominal si
43、ze couplings, and 1/4 inch (6.4 mm) thick for 3 inch (76.2 mm) nominal size and larger couplings. 6.7 A valve inlet that is provided with male or female pipe threads shall comply with the Standard for Pipe Threads, General Purpose (Inch), Revision and Redesignation of ASMUANSI B2.1-1968 R(1992). APR
44、IL 18, 2001 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS - UL 1726 7 7 Valve Outlets and Threads 7.1 A valve outlet is not prohibited from having a nipple with male or female hose or NPT threads. 7.2 An outlet with hose threads shall be cast integrally with the valve body. 7.3 Hose threads provided
45、at the outlet of a valve shall be threaded in accordance with the Standard for Fire Hose Connections, ANSVNFPA 1963-1 998, unless specifically intended to fit existing equipment not having these threads. PERFORMANCE 8 Valve Closing Test 8.1 A valve shall close at an applied pressure of 10 psig (68.9
46、 kPa) or less. 8.2 A valve of each size installed in its intended position is to be connected to a water source and slowly pressurized. The pressure at which the flow is reduced to 0.75 gallons per minute (2.8 Um), or less, is defined as closing. 9 Valve Opening Test 9.1 A valve shall open at a pres
47、sure of not less than 5 psig (34.5 kPa). 9.2 The test apparatus utilized to determine compliance with the requirement of 9.1 is to be a horizontal and level piping assembly consisting, in sequence, of: a) A quarter-turn ball valve connected to a water source; b) A tee with the stem pointing vertical
48、ly upward; c) A needle valve; and d) The drain valve under test. A manometer is to be fitted to the vertical stem of the tee, and the end of the manometer is to be open to the atmosphere. 9.3 With the needle valve closed, the ball valve is to be opened and water is to flow in the assembly until the
49、drain valve closes and water rises in the manometer. The ball valve then is to be closed and the needle valve opened so that the water level in the manometer decreases. When the drain valve opens, the water level in the manometer shall be equivalent to a pressure of not less than 5 psig (34.5 kPa). 8 AUTOMATIC DRAIN VALVES FOR STANDPIPE SYSTEMS - UL 1726 APRIL 18, 2001 10 Body Leakage Test 10.1 A valve body shall show no leakage when pressurized to twice the valves rated maximum working pressure. 10.2 A valve of each size is to be fitted with threaded pipe plugs and filled with water
