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PLUMBING SYSTEM ACCESSORIES <br />Section 15410 <br />15-1207 <br />(1) For Sizes 2 Y2" and smaller - Ball Valve <br />(2) For Sizes 3" and larger — Plug Valve <br />b. At connection to equipment: Lever handle Gas Cock <br />3. Check Valves: <br />a. Piping in horizontal orientation: Swing Check Valve <br />b. Piping in vertical orientation: Lift Check Valve <br />B. General: <br />Install valves with stems upright or horizontal. Valves stem position to be arranged <br />to allow access for maintenance. <br />2. Do not install swing check valves in vertical position. <br />3. Provide gas cocks for gas service. <br />4. Provide lubricated plug valve at gas entrance to building. <br />5. Examine valve interior for cleanliness, freedom from foreign matter, and corrosion. <br />Remove special packing materials, such as blocks, used to prevent disc movement <br />during shipping and handling. <br />6. Operate valves in positions from fully open to fully closed prior to installing within <br />system. <br />7. Install valves with unions or flanges at each piece of equipment arranged to allow <br />service, maintenance, and equipment removal without system shutdown. <br />8. Locate valves for easy access and provide separate support where necessary. <br />9. Install valves in horizontal piping with stem at or above center of pipe. <br />10. Install valves in position to allow full stem movement. <br />11. Install check valves for proper direction of flow and as follows: <br />a. Swing Check Valves: In horizontal position with hinge pin level. <br />b. Lift Check Valves: With stem upright and plumb. <br />12. Install valves where required for proper operation of piping and equipment, including <br />valves in branch lines where necessary to isolate sections of piping. Locate valves <br />so as to be accessible and so that separate support can be provided when <br />necessary. <br />13. Provide union at each connection to equipment and downstream of each valve. <br />Provide unions at both ends of valves when valves cannot be turned due to an <br />obstruction. <br />14. Install seismic gas valve downstream of gas meter. <br />15. Tag each valve and provide a complete listing of valve locations and functions. <br />11 <br />