Anti-Siphon Fill Valves for Water Closet Tanks

Transcription

1 ASSE Standard # ASSE Board Approved: APRIL 28, 2008 ANSI Approval: DATE American Society of Sanitary Engineering Performance Requirements for Anti-Siphon Fill Valves for Water Closet Tanks An American National Standard

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3 General Information Neither this standard, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering. No product may be said to be ASSE approved unless the manufacturer has applied to the ASSE, has had his product tested according to the applicable ASSE Standards, and when the product has passed the test, displays the ASSE Seal on the product. Instructions for receiving the authorization to display the Seal are available from ASSE's International Office. Organizations wishing to adopt or list any ASSE Standard should print the ASSE Standard number on the cover page first and in equal or larger type to that of the adopting or listing organization. American Society of Sanitary Engineering Westlake, Ohio Copyright 2008, 1999, 1986, 1979, 1976 Anti-Siphon Fill Valves for Water Closet Tanks ASSE Standard # i

4 ii Anti-Siphon Fill Valves for Water Closet Tanks

5 Foreword This foreword shall not be considered a part of the standard, however, it is offered to provide background information. ASSE standards are developed in the interest of consumer safety. This standard outlines the performance requirements for Anti-siphon Fill Valves (Ballcocks) for Gravity Water Closet Flush Tanks, and describes those performance requirements in terms of methods of testing applicable to all such units, equivalent materials or methods of testing intended to demonstrate compliance with these requirements are also acceptable. Recognition is made of the time volunteered by members of the working group and of the support of the manufacturers who also participated in the meetings for this standard. This standard does not imply ASSE s endorsement of a product which conforms to these requirements. Compliance with this standard does not imply acceptance by any code body. It is recommended that these devices be installed consistent with local codes by qualified and trained professionals. This standard was promulgated in accordance with procedures developed by the American National Standards Institute (ANSI). Anti-Siphon Fill Valves for Water Closet Tanks iii

6 Product Standards Committee Edward Lyczko Product Standards Committee Chairman Cleveland Clinic Cleveland, Ohio Rand H. Ackroyd Rand Engineering Newburyport, Massachusetts Gunnar O. Collins Collins Backflow Specialists, Inc. Palatine, Illinois Judson W. Collins JULYCO Professionals Mannford, Oklahoma Shannon M. Corcoran ASSE Standards Coordinator Westlake, Ohio A. Richard Emmerson General Interest Buffalo Grove, Illinois Ron George Ron George Design & Consulting Newport, Michigan Charles Gross International Association of Plumbing and Mechanical Officials Walnut, California John F. Higdon, P.E. Apollo Valves/Conbraco Industries, Inc. Pageland, South Carolina Valentine Lehr, P.E. Lehr Associates New York, New York Chuck Lott Precision Plumbing Products, Inc. Portland, Oregon Peter Marzec United Association of Plumbers and Pipefitters Washington, D.C. Brad Noll Wilkins, A Division of Zurn Industries, Inc. Paso Robles, California Thomas C. Pitcherello State of New Jersey Bordentown, New Jersey Shabbir Rawalpindiwala Kohler Company Kohler, Wisconsin Tsan-Liang Su, Ph.D. Center for Environmental Systems Stevens Institute of Technology Hoboken, New Jersey Steven Hazzard ASSE Staff Engineer Westlake, Ohio iv Anti-Siphon Fill Valves for Water Closet Tanks

7 1002 Working Group Arturo Robles 1002 Working Group Chairman Fluidmaster, Inc. San Juan Capistrano, California Bruce Artunez Coast Foundry Pamona, California Steven Hazzard ASSE Staff Engineer Westlake, Ohio Larry Himmelblau Chicago Faucet Co. / Geberit Des Plaines, Illinois Sarah Morgan Oatey Company Cleveland, Ohio Norman M. Kummerlen Moen, Inc. North Olmsted, Ohio Sally Remedios Delta Faucet Co. Indianapolis, Indiana Steve Tokarz Brass Craft Novi, Michigan David Viola IAPMO Ontarioa, California John Watson Sloan Valve Company Franklin Park, Illinois Chip Way Lavelle Industries Burlington, Wisconsin Manfred Wolpert Chicago Faucet Co. / Geberit Des Plaines, Illinois Shabbir Rawalpindiwala Kohler Company Kohler, Wisconsin Anti-Siphon Fill Valves for Water Closet Tanks v

8 Table of Contents Section I General Application Scope... 1 Figure 1 - Shank, Locknut and Coupling Nut Dimensions Reference Standards... 2 Section II Test Specimens Samples Submitted for Test Samples Tested Drawings Rejection... 3 Section III Performance Requirements and Compliance Testing Elevated Pressure and Temperature Test Cycle Test Critical Level Marking and Backflow Prevention Test... 5 Figure 2 - Anti-Siphon Fill Valve Test Assembly Total Flow Test - Retrofit Devices Only Refill Capacity Test - Retrofit Devices Only... 6 Section IV Detailed Requirements Materials Identification and Markings Installation Instructions... 8 Section V Definitions... 9 Appendix A... 9 vi Anti-Siphon Fill Valves for Water Closet Tanks

9 Anti-Siphon Fill Valves for Water Closet Tanks Section I 1.0 General 1.1 Application This standard provides dimensional and minimum performance requirements for anti-siphon fill valves for water closet tanks (herein referred to as the device ), including protection of the potable water supply against back siphonage of water from the water closet tank. 1.2 Scope Description These devices are cold water supply valves that are installed within water closet tanks to provide tank refill and a trap reseal after flushing a water closet. They are equipped with backflow prevention devices or an air gap Working Pressure The device shall be designed to operate at a minimum pressure range of 20.0 psi to psi static (137.9 kpa to kpa) Capacity - Total Fill and Refill Original Equipment Manufacturer When the device is furnished as original equipment with a manufacturer s water closet, the total flow capacity shall be sufficient to assure proper operation of the fixture in accordance with the performance standard, ASME A The device shall deliver a fill rate through the refill orifice as required by the water closet manufacturer Retrofit Use When the device is furnished to retrofit water closets, the device shall deliver a minimum flow rate at 15.0 psig (103.4 kpa) flowing pressure of 1.5 GPM (5.7 L/min), and a minimum refill flow rate, through the refill orifice, of 20% of the total fill rate at 15.0 psi (103.4 kpa) flowing pressure Leakage and Spray Containment The device shall not spray or otherwise leak water to the outside of the water closet tank during operation Backflow Prevention The device shall be equipped with a means to prevent backflow due to back siphonage. Air inlet ports shall be protected in such a manner as to reduce the risk of the intake of foreign material into the device. Anti-Siphon Fill Valves for Water Closet Tanks 1

10 1.2.6 Refill Tube A means shall be provided to secure the refill tube in its installed position Dimensional Criteria for Fill Valve Components Dimensions for shanks, coupling nuts and locknuts shall be as shown in Figure 1. Thread dimensions shall be 15/16-14 UNS-1 per ASME/ANSI B1.1. See Appendix A. Figure 1 Shank, Locknut and Coupling Nut Dimensions < SHANK B COUPLING NUT Note 2 A < > H Note 3 < E > C >< > Note 1 < > D Note 4 G < > F A LOCKNUT (OR MOUNTING NUT) <> < B Note 2 A > A B C D E F G 15/16-14UNS-1 Thread 1.40 inches (35.56 mm) minimum diameter 1.37 inches (34.8 mm) minimum 1.62 inches (41.15 mm) minimum inches (15.88 mm mm) inside diameter 0.50 inches (12.70 mm) minimum effective thread depth 0.31 inches (7.87 mm) minimum H 0.5 inches (12.70 mm) minimum depth NOTE 1: 0.1 inches (2.5 mm) maximum chamfer permissible as shown in figures. NOTE 2: Thread lead-in chamfers shall be permitted NOTE 3: The shank bottom surface shall be smooth and suitable for sealing with flat washers. NOTE 4: 0.1 inch (2.5 mm) maximum lead in for thread shall be allowed. 1.3 Reference Standards Referenced industry standards shall mean the listed edition of the standard. ASME A Performance Requirements for Backflow Protection Devices and Systems in Plumbing Fixture Fittings ASME A Vitreous China Plumbing Fixtures and Hydraulic Requirements for Water Closets and Urinals ASME B Unified Inch Screw Threads 2 Anti-Siphon Fill Valves for Water Closet Tanks

11 Section II 2.0 Test Specimens 2.1 Samples Submitted for the Test Three (3) devices of each model shall be submitted by the manufacturer. 2.2 Samples Tested The testing agency shall select one (1) of each model for the full test. Tests shall be performed in the order listed on one (1) device of each model submitted. 2.3 Documentation Assembly drawings, installation instructions, and other information which are needed to enable a testing agency to determine compliance with this standard, shall accompany devices when submitted for examination and performance tests. 2.4 Rejection Failure of one (1) device shall be cause for rejection of that model. Anti-Siphon Fill Valves for Water Closet Tanks 3

12 Section III 3.0 Performance Requirements and Compliance Testing 3.1 Elevated Pressure and Temperature Test Purpose The purpose of this test is to evaluate the device s performance at elevated temperatures and pressures; and to ensure that the manufacturer has provided a means for securing the refill tube to the overflow tube and that it remains in place during the test Procedure The device shall be installed in a water closet tank or container per the manufacturer s instructions. The water shall be permitted to be displaced in the water closet tank or container. The water supply temperature for this test shall be maintained at F ± 5.0 F (48.9 C ± 2.8 C), with a static pressure of psi (861.9 kpa). Flush the water closet tank every five (5) minutes for a total of fifty (50) cycles using a flush volume tolerance of 1.4 to 2.0 gallons (5.3 to 7.6 liters). Following this test, and with the water closet tank filled with water maintained at F ± 5.0 F (48.9 C ± 2.8 C), the pressure in the device shall be raised to psig ( kpa) and maintained for five (5) minutes. The device shall be checked for leakage, distortion, or other indications of damage which would affect the device s performance Criteria Any indications of leakage, distortion, or other damage which affects the device s performance shall result in a rejection of the device. Failure of the refill tube to remain in place throughout this test shall result in a rejection of the device. 3.2 Cycle Test Purpose The purpose of this test is to demonstrate the device s long-term operational performance Procedure Install the device per the manufacturer s instructions in a water closet tank or container. The device shall be operated a total of seventy-five thousand (75,000) cycles at a minimum of 90.0 psi (620.6 kpa) static pressure and 70.0 psig (482.7 kpa) minimum flowing pressure using ambient temperature [65.0 F F (18.3 C to 26.7 C)] water. For each cycle, the tank shall be filled and the cycle shall have a maximum cycle time of one (1) minute. The water shall be permitted to be displaced in the tank to accelerate this test. Following this test, maintain a static pressure of psig ( kpa) for five (5) minutes, and observe for leakage, distortion, or other indications of damage which would affect the device s performance Criteria Any indications of leakage, distortion, or other damage which affects the device s performance shall result in a rejection of the device. Failure of the refill tube to remain in place throughout this test shall result in a rejection of the device. 4 Anti-Siphon Fill Valves for Water Closet Tanks

13 3.3 Critical Level Marking and Backflow Prevention Test Purpose The purpose of this test is to verify the Critical Level (CL) marking, and ensure that the backflow prevention feature functions as intended Procedure Install the device in accordance with Figure 2. Foul all of the check valves, seats and checking members with a inches (0.8 mm) diameter wire. The fouling wire shall be placed at a single point on each seating area. Figure 2 Anti-Siphon Fill Valve Test Assembly Antisiphon Fill Valve Bowl Refill Tube AA BB Test Tank Tank Fill Tube Colored Water Lock Nut Sight Glass Pressure Gauge Quick Opening Valve Slow Opening Valve To Vacuum Tank Water Collecting Drain A sight glass shall be assembled to the shank assembly as shown in Figure 2. Start with the tank water level inches (3.2 mm) below the vacuum breaker air port(s) or water discharge openings (air gaps type). As the water level is lowered, the device shall be subjected to an instantaneous vacuum of 25 inches of mercury (84.7 kpa) until there is no water in the sight glass. Next, apply an intermittent vacuum of 5 inches of mercury (16.9 kpa) for five (5) seconds on and five (5) seconds off until there is no water in the sight glass. Repeat the intermittent vacuum test Anti-Siphon Fill Valves for Water Closet Tanks 5

14 at 10, 15, 20, and 25 inches of mercury (33.9 kpa, 50.8 kpa, 67.8 kpa, and 84.7 kpa) until there is no water in the sight glass. This determines line BB, the elevation at which back-siphonage ceases as the test tank water level is lowered. To determine line AA, the elevation at which back-siphonage begins as the level is raised, set the water level one (1) inch (25.4 mm) below line BB. The device shall be subjected to an instantaneous vacuum of 25 inches of mercury (84.7 kpa). Increase the water level by increments of inch (3.2 mm) until water appears in the sight glass. At each inch (3.2 mm) increment, apply an intermittent vacuum of 5 inches of mercury (16.9 kpa) for five (5) seconds on and five (5) seconds off until water appears in the sight glass. Repeat the intermittent vacuum test at 10, 15, 20, and 25 inches of mercury (33.9 kpa, 50.8 kpa, 67.8 kpa, and 84.7 kpa) until water appears in the sight glass. While lines AA and BB may coincide, the lower of the two (2) lines shall be determined to be the Critical Level (CL) of the device Criteria a) If the Critical Level (CL) mark on the device is at or below the Critical Level (CL) determined in Section 3.3.2, proceed to Section 3.5. b) If water fails to appear in the sight glass, the device shall be tested to Section c) If the Critical Level (CL) mark on the device is above the Critical Level (CL) determined in Section 3.3.2, this shall result in a rejection of the device Procedure to Determine if There are Hidden Checks Install the device in accordance with Figure 2. Hold all of the check valves, seats and checking members fully open. Seal off the air inlet ports. A sight glass shall be assembled to the shank assembly as shown in Figure 2. Submerge the device completely under the water in the water closet tank, and subject the device to a vacuum of 25 inches of mercury (84.7 kpa). Check for water in the sight glass. Failure of water to appear in the sight glass shall indicate the presence of a hidden check valve. Repeat the procedure in Section with the check valve(s) fully open until water appears in the sight glass. Retest to Section Total Flow Test - Retrofit Devices Only Purpose The purpose of this test is to verify that the retrofit device meets minimum flow rates Procedure The device shall be set to run fully open with a flowing pressure of 15.0 psi (103.4 kpa) measured at the inlet to the device. Measure the flow rate for a minimum of one (1) minute Criteria Failure of the device to flow a minimum of 1.5 GPM (5.7 L/min) at 15.0 psi (103.4 kpa) flowing pressure shall result in a rejection of the device. 3.5 Refill Capacity Test - Retrofit Devices Only Purpose The purpose of the test is to verify that the device meets minimum refill requirements. 6 Anti-Siphon Fill Valves for Water Closet Tanks

15 3.5.2 Procedure The device shall be set to run fully open with a flowing pressure of 15.0 psi (103.4 kpa) measured at the inlet of the device. The refill flow rate shall be measured for a minimum of one (1) minute Criteria Failure of the device to flow a minimum of 20% of the flow rate measured in Section through the refill tube at 15.0 psi (103.4 kpa) flowing pressure shall result in a rejection of the device. Anti-Siphon Fill Valves for Water Closet Tanks 7

16 Section IV 4.0 Detailed Requirements 4.1 Materials Solder and fluxes containing lead in excess of 0.2% shall not be used in contact with potable water. Metal alloys in contact with potable water shall not exceed 8% lead. 4.2 Identification and Markings Each device shall be permanently marked with the following information in such a manner that the device can be readily identified after installation. a) Manufacturer s name or trademark; b) Model name or number, or part number; c) Critical Level marking for device with air inlet ports. 4.3 Installation Instructions When devices are furnished to retrofit water closets, installation instructions shall be provided with the final packaged product. 8 Anti-Siphon Fill Valves for Water Closet Tanks

17 Section V 5.0 Definitions Definitions not found in this Section are located in the Plumbing Dictionary, Sixth Edition, published by the ASSE. Anti-Siphon Fill Valve Anti-siphon fill valves are cold water supply valves that are installed within water closet tanks to provide tank refill and a trap reseal after flushing a water closet. They are equipped with backflow prevention devices or an air gap. Critical Level The lowest water level in a fitting at which backsiphonage will not occur 1. Appendix A This Appendix shall not be considered a part of the standard. It is provided for informational purposes only. Thread Dimensions (For Reference Only) The information in this appendix is the result of a series of calculations which are specified in reference standard ASME/ANSI B1.1. Fill Valve Shanks Nominal Shank Size 15/16 inch (23.81 mm) External Thread Designation 15/16-14UNS- 1A Major Diameter of Thread Pitch Diameter of Thread Maximum Minimum Maximum Minimum inch (23.77 mm) inch (23.37 mm) inch (22.50 mm) inch (22.39 mm) Fill Valve Locknuts and Coupling Nuts Nominal Size 15/16 inch (23.81 mm) Internal Thread Designation 15/16-14UNS- 1B Minor Diameter of Thread Pitch Diameter of Thread Maximum Minimum Maximum Minimum inch (22.05 mm) inch (21.85 mm) inch (22.90 mm) inch (22.63 mm) 1. Excerpt from the ASME A /CSA B125.1). Anti-Siphon Fill Valves for Water Closet Tanks 9

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