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Southern Human Services Center Smith Sinnett /2020072 <br />HVAC and Roof Renovations Orange County,North Carolina <br />General-Duty Valves for HVAC Piping 23 <br />05 23 - 4 <br />8.Ball: Stainless steel vented. <br />9.Handle:Provide lever handle with 2-1/4"stem extension for insulation <br />2.05 IRON,SINGLE FLANGE BUTTERFLY VALVES <br />A.Lug type:Bi-directional dead end service without downstream flange. <br />1.Comply with MSS SP-67,Type I. <br />2.CWP Rating: 150 psig. <br />3.Body Material: ASTM A536 ductile iron. <br />4.Seat: EPDM or Viton. <br />5.Disc: Aluminum-bronze or 316 stainless steel. <br />2.06 IRON,GROOVED-END BUTTERFLY VALVES <br />A.CWP Rating: 175 psig (1200 kPa). <br />1.Comply with MSS SP-67,Type I. <br />2.Body: Coated ductile iron ASTM A536. <br />3.Stem: Stainless steel. <br />4.Disc: Aluminum-bronze or 316 stainless steel. <br />5.Disc Seal: EPDM or Viton. <br />2.07 HIGH-PERFORMANCE SINGLE FLANGE BUTTERFLY VALVES <br />A.Lug type: Bi-directional dead end service without downstream flange. <br />1.Comply with MSS SP-68. <br />2.Class 300: CWP Rating: 720 psig at 100 degrees F. <br />3.Body: Provide ductile Iron or stainless steel. <br />4.Seat: Metal or reinforced PTFE. <br />5.Offset stem: Stainless steel. <br />6.Disc: Carbon steel. <br />2.08 IRON,CENTER-GUIDED CHECK VALVES <br />A.Class 150,Compact-Wafer: <br />1.Comply with MSS SP-125. <br />2.2-1/2 NPS to 12 NPS,CWP Rating: 300 psig. <br />3.Body Material: ASTM A395/A395M or ASTM A536,ductile iron. <br />4.Metal Seat: Bronze. <br />PART 3 EXECUTION <br />3.01 EXAMINATION <br />A.Discard all packing materials and verify that valve interior,including threads and flanges,are <br />completely clean without signs of damage or degradation that could result in leakage. <br />B.Verify valve parts to be fully operational in all positions from closed to fully open. <br />C.Confirm gasket material to be suitable for the service,to be of correct size,and without defects <br />that could compromise effectiveness. <br />D.Should valve be determined to be defective,replace with new valve. <br />3.02 INSTALLATION <br />A.Provide unions or flanges with valves to facilitate equipment removal and maintenance while <br />maintaining system operation and full accessibility for servicing. <br />B.All valves shall be installed within 24"of the lay-in ceiling. <br />C.Provide separate valve support as required and locate valve with stem at or above center of <br />piping,maintaining unimpeded stem movement. <br />D.Where valve support members are welded to structural building framing,scrape,brush clean,and <br />apply one coat of zinc-rich primer to welds. <br />E.Install check valves where necessary to maintain direction of flow as follows: <br />1.Lift Check: Install with stem plumb and vertical. <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6