UL 1726:2001 pdf download Automatic Drain Valves for Standpipe Systems
1 Scope
1.1 These requirements cover automatic drain valves that are intended to drain water from cavities instandpipe systems intended usually to be empty, such as those between a hose valve and hose rack, andpipe sections between fire department connections and check valves.
1.2 The valves covered by these requirements are intended for installation and use in accordance withthe Standard for the lnstallation of Sprinkler Systems, ANSI/NFPA 13-1999, and The Standard for thenstallation of Standpipe, Private Hydrant, and Hose Sstems, ANSI/NFPA 14-2000.
2 Units of Measurement
2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
3 Components
3.1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with therequirements for that component.
3.2 A component is not required to comply with a specific requirement that:
a)lnvolves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
b) Is superseded by a requirement in this standard.
3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
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 notexceeding specified limits, and shall be used only under those specific conditions.
4 Undated References
4.1 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.
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 hose 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) nominalsize 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 couplings. See Table 6.1.
6.3 A threaded valve inlet and swivel shall have at least three V-shaped grooves in the grooved surfacesecuring the swivel to the tail piece.
6.4 The wire component of a valve inlet that utilizes a wire-groove and swivel shall have a round orsquare 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 theflange of the swivel shall not be less 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 theswivel. The gasket shall be 1/8 inch (3.2 mm) thick for 1-1/2 inch (38.1 mm) nominal size couplings, 3/16inch (4.8 mm) thick for 2-1/2 inch (63.5 mm) nominal size 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 shal comply with the Standard for PipeThreads,General Purpose (lnch), Revision and Redesignation of ASME/ANSI B2.1-1968 R(1992).