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FIG 548 <br />PF _SSURE-VACUUM <br />548 & 548A <br />PRESSURE -VACUUM <br />VENT <br />WITH GAUGE HATCH <br />For "normal" venting of Aboveground Stor- <br />age Tanks. Allows tank to "breath" during <br />filling and withdrawing operations. Pressure - <br />vacuum poppets seal vapors in the tank when <br />pressure is equalized. This vent must be <br />used in conjunction with an emergency vent <br />and it is RECOMMENDED that the opening <br />pressure setting is set below that of the emer- <br />gency vent so the normal vent relieves first. <br />vEArs <br />FIG 748 <br />748 & 748 A <br />PRESSURE -VACUUM <br />VENT <br />For "normal" venting of Aboveground Stor- <br />age Tanks. Allows tank to 'breath" during <br />filling and withdrawing operations. Pressure - <br />vacuum poppets seal vapors in the tank when <br />pressure is equalized. This vent must be <br />used in conjuction with an emergency vent <br />and it is RECOMMENDED that the opening <br />pressure setting is set below that of the emer- <br />gency vent so the normal vent relieves first. <br />CONSTRUCTION DETAILS CONSTRUCTION DETAILS <br />FIG 548...................Brass <br />Body and Hood. <br />volume aboveground tanks for motor <br />FIG 748 ................... Stainless Steel Poppets. <br />fueling. Vent allows tank to "breath" <br />.- <br />FIG 548 A <br />Body and Hood. <br />Poppets seal vapors in the tank when <br />FIG 748 A ............... Brass Poppets <br />FIG 749 <br />approximate. <br />................Aluminum <br />Warning: FIG 749 PN Vent must only <br />(Fig 748 available in 2.0 oz/ sq in pressure - 1.0 <br />oz/ sq in Vacuum <br />only) <br />Standard Features: <br />FIG 749 CRB - 2" NPT C.A.R.B. <br />handling in lines larger than that used <br />approval (95-15A) for Stage I & <br />for retail service station can cause <br />II. Viton O -rings on pressure <br />tank to rupture or implode. <br />1. Brass (raised) <br />metal -to -metal Seats./Poppets. <br />FIG 749 CRSS - 2" Slip-on style <br />Pressure Vacuum Ship Venting <br />Standard Features: <br />Setting Setting Weight Capacity <br />Stage I & II. Viton 0 -rings on <br />S <br />2. Threaded Gauge <br />Hatch for manual gauging access. <br />(@2.5 PSI) <br />1. Aluminum Body and Hood. <br />FIG 749 & 749 S <br />Body•..--.••••.......... Aluminum <br />3. Horizontal Discharge and field -adjustable, tripolar orientation. <br />Pressure Poppet ••• Aluminum <br />2. Horizontal Discharge with field -adjustable <br />tripolar orientation. <br />FIG 749 CRB & 749CRBS <br />Size Pressure <br />Vacuum Fig 548 Fig 548A <br />Venting <br />Size Pressure Vacuum Fig 748 <br />Fig 748A <br />Venting <br />Setting <br />Setting Ship <br />Ship <br />Capacity <br />Setting Setting Ship <br />Ship <br />Capacity <br />(oz /sq in) <br />(oz /sq in) Weight <br />Weight <br />(CFH) <br />(oz /sq in) (oz /sq in) Weight <br />Weight <br />(CFH) <br />(LBS) <br />(LBS) <br />(@2.5 PSI) <br />(LBS) <br />(LBS) <br />(@2.5 PSI) <br />2" 2.0 <br />1.0 13.25 <br />7.00 <br />20,200 <br />2' 2.0 1.0 13.25 <br />7.00 <br />20,200 <br />2" 4.0 <br />1.0 13.75 <br />8.75 <br />20,200 <br />2' 4.0 1.0 NA <br />8.75 <br />20,200 <br />2" 6.0 <br />1.0 14.25 <br />8.50 <br />20,200 <br />2" 6.0 1.0 NA <br />8.50 <br />20,200 <br />2' 8.0 <br />1.0 14.75 <br />9.50 <br />20,200 <br />2" 8.0 1.0 NA <br />9.50 <br />20,200 <br />2' 12.0 <br />1.0 15.75 <br />10.50 <br />18,600 <br />2" 12.0 1.0 NA <br />10.50 <br />18,600 <br />2' 16.0 <br />1.0 17.00 <br />11.25 <br />18,000 <br />2" 16.0 1.0 NA <br />11.25 <br />18.000 <br />3" 2.0 <br />1.0 26.25 <br />12.25 <br />43,000 <br />3" 4.0 <br />1.0 27.25 <br />13.75 <br />43,000 <br />3" 6.0 <br />1.0 28.25 <br />15.00 <br />43,000 <br />3" 8.0 <br />1.0 28.75 <br />15.75 <br />43,000 <br />3" 12.0 <br />1.0 - 29.25 <br />15.75 <br />40,000 <br />3" 16.0 <br />1.0 33.25 <br />20.50 <br />40,000 <br />749 SERIES <br />PRESSURE -VACUUM <br />VENT <br />FIG 748 ALT <br />CONSTRUCTION DETAILS <br />Size....................................2" NPT <br />Body and Cap ............... Aluminum <br />Poppets ......... Teflon Coated Alum <br />Screens ................. Stainless Steel <br />Option: (Must specify) - male <br />NPT connection for dryer appli- <br />cation. <br />Option: Pressure discharge <br />NPT hood available. <br />748 ALT <br />PRESSURE -VACUUM <br />VENT <br />FOR AG -CHEMICAL <br />Vent valve used with aqua-amonia and <br />ag-chemical products allowing tank to <br />"breathe" during loading/unloading op- <br />erations. Poppets seal vapors in the <br />tank when pressure is equalized. Set- <br />tings are approximate. <br />Pressure Vacuum Ship Venting <br />Setting Setting Weight Capacity <br />(lbs /sq in)(oz /sq in) (LBS) (CFH) <br />(@2.5 PSI) <br />0.5 1.0 5.5 20,200 <br />1.0 1.0 5.5 18,000 <br />2.0 1.0 5.5 NA <br />25 <br />Vent valve used on underground & low <br />volume aboveground tanks for motor <br />i <br />fueling. Vent allows tank to "breath" <br />.- <br />during filling/dispensing operations. <br />Poppets seal vapors in the tank when <br />pressure is equalized. Settings are <br />FIG 749 <br />approximate. <br />CONSTRUCTION DETAILS <br />Warning: FIG 749 PN Vent must only <br />FIG 749 - 2" NPT <br />be used in conjunction with motor <br />FIG 749 S - 2" Slip-on style <br />fueling and/or low capacity flow. Fluid <br />FIG 749 CRB - 2" NPT C.A.R.B. <br />handling in lines larger than that used <br />approval (95-15A) for Stage I & <br />for retail service station can cause <br />II. Viton O -rings on pressure <br />tank to rupture or implode. <br />poppet. <br />FIG 749 CRSS - 2" Slip-on style <br />Pressure Vacuum Ship Venting <br />C.A.R.B. approval (95-15A) for <br />Setting Setting Weight Capacity <br />Stage I & II. Viton 0 -rings on <br />S <br />(oz /sq in) (oz /sq in) (LBS) (CFH) <br />pressure poppet. <br />(@2.5 PSI) <br />FIG 749 & 749 S <br />Body•..--.••••.......... Aluminum <br />8.0 0.5 1.0 8,500 <br />Pressure Poppet ••• Aluminum <br />12.0 0.5 1.0 8,500 <br />Vacuum Poppet ••.•.•••. Brass <br />FIG 749 CRB & 749CRBS <br />Seal ........................... Buna-N <br />3"W.C. 8" W.C. 1.2 <br />Screen .................... ...•. Brass <br />8 oz. 5 oz. 1.2 <br />FIG 748 ALT <br />CONSTRUCTION DETAILS <br />Size....................................2" NPT <br />Body and Cap ............... Aluminum <br />Poppets ......... Teflon Coated Alum <br />Screens ................. Stainless Steel <br />Option: (Must specify) - male <br />NPT connection for dryer appli- <br />cation. <br />Option: Pressure discharge <br />NPT hood available. <br />748 ALT <br />PRESSURE -VACUUM <br />VENT <br />FOR AG -CHEMICAL <br />Vent valve used with aqua-amonia and <br />ag-chemical products allowing tank to <br />"breathe" during loading/unloading op- <br />erations. Poppets seal vapors in the <br />tank when pressure is equalized. Set- <br />tings are approximate. <br />Pressure Vacuum Ship Venting <br />Setting Setting Weight Capacity <br />(lbs /sq in)(oz /sq in) (LBS) (CFH) <br />(@2.5 PSI) <br />0.5 1.0 5.5 20,200 <br />1.0 1.0 5.5 18,000 <br />2.0 1.0 5.5 NA <br />25 <br />