Laserfiche WebLink
FIG 548 - <br />PREOSURENACUUM <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 belowthat of the emer- <br />gency vent so the normal vent relieves first. <br />CONSTRUCTION DETAILS <br />FIG 548...................Brass Body and Hood. <br />FIG 548 A................Aluminum Body and Hood. <br />Standard Features: <br />1. Brass (raised) metal -to -metal Seats!Poppets. <br />2. Threaded Gauge Hatch for manual gauging access. <br />3. Horizontal Discharge and field -adjustable, tripolar orientation. <br />VEN* <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 <br />FIG 748...................Stainless Steel Poppets. <br />FIG 748 A ............... Brass Poppets <br />(Fig 748 available in 2.0 oz/ sq in pressure - 1.0 oz/ sq in Vacuum only) <br />Standard Features: <br />1. Aluminum Body and Hood. <br />2. Horizontal Discharge with field -adjustable tripolar orientation. <br />Size <br />Pressure <br />Vacuum <br />Fig 548 <br />Fig 548A <br />Venting <br />Size <br />Pressure <br />Vacuum <br />Fig 748 <br />Fig 748A <br />Venting <br />poppet. <br />Setting <br />Setting <br />Ship <br />Ship <br />Capacity <br />Stage I & Il. Viton O -rings on <br />S <br />Setting <br />Setting <br />Ship <br />Ship <br />Capacity <br />Body ..................... Aluminum <br />(oz !sq in) <br />(oz /sq in) <br />Weight <br />Weight <br />(CFH) <br />Seal .................. :........ Buna-N <br />(oz /sq in) <br />(oz /sq in) <br />Weight <br />Weight <br />) <br />1.0 1.0 <br />5.5 <br />18,000 <br />(LBS) <br />(LBS) <br />(@2.5 PSI) <br />NA <br />(LBS) <br />(LBS) <br />(@2.5 PSI) <br />2" <br />2.0 <br />1.0 <br />13.25 <br />7.00 <br />20,200 <br />2' <br />2.0 <br />1.0 <br />13.25 <br />7.00 <br />20,200 <br />2" <br />4.0 <br />1.0 <br />13.75 <br />8.75 <br />20,200 <br />2" <br />4.0 <br />1.0 <br />NA <br />8.75 <br />20,200 <br />2" <br />6.0 <br />1.0 <br />14.25 <br />8.50 <br />20,200 <br />2" <br />6.0 <br />1.0 <br />NA <br />8.50 <br />20,200 <br />2" <br />8.0 <br />1.0 <br />14.75 <br />9.50 <br />20,200 <br />2" <br />8.0 <br />1.0 <br />NA <br />9.50 <br />20,200 <br />2" <br />12.0 <br />1.0 <br />15.75 <br />10.50 <br />18,600 <br />2" <br />12.0 <br />1.0 <br />NA <br />10.50 <br />18,600 <br />2" <br />16.0 <br />1.0 <br />17.00 <br />11.25 <br />18,000 <br />2" <br />16.0 <br />1.0 <br />NA <br />11.25 <br />18.000 <br />3" <br />2.0 <br />1.0 <br />26.25 <br />12.25 <br />43,000 <br />3' <br />4.0 <br />1.0 <br />27.25 <br />13.75 <br />43,000 <br />3" <br />6.0 <br />1.0 <br />28.25 <br />15.00 <br />43,000 <br />3" <br />8.0 <br />1:0 <br />28.75 <br />15.75 <br />43,000 <br />3" <br />12.0 <br />1.0 <br />29.25 <br />15.75 <br />40,000 <br />3' <br />16.0 <br />1.0 <br />33.25 <br />20.50 <br />40,000 <br />FIG 749 <br />749 SERIES <br />PRESSURE -VACUUM <br />VENT <br />Vent valve used on underground & low <br />volume aboveground tanks for motor <br />fueling. Vent allows tank to "breath" <br />during filling/dispensing operations. <br />Poppets seal vapors in the tank when <br />pressure is equalized. Settings are <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 capacilyflow. 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 0 -rings on pressure <br />tank to rupture or implode. <br />poppet. <br />Ship <br />FIG 749 CRBS - 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 & Il. Viton O -rings on <br />S <br />(oz /sq in) (oz !sq in) (LBS) (CFH) <br />pressure poppet. <br />(@2.5 PSI) <br />(CFH) <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. 12 <br />Screen .......................... Brass <br />8 oz. 5 oz. 12 <br />FIG 748 ALT <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 />CONSTRUCTION DETAILS <br />tangs are approximate. <br />Size. ................................... 2- NPT <br />Body and Cap...............Aluminum <br />Poppets ......... Teflon Coated Alum <br />Pressure Vacuum <br />Ship <br />Venting <br />Screens.................Stainless Steel <br />Setting Setting <br />Weight <br />Capacity <br />Option: (Must specify) - male <br />(Ibs /sq in)(oz /sq in) <br />(LBS) <br />(CFH) <br />(@2.5 PSI) <br />NPT connection for dryer appli- <br />cation. <br />0.5 1.0 <br />5.5 <br />20,200 <br />Option: Pressure discharge <br />1.0 1.0 <br />5.5 <br />18,000 <br />NPT hood available. <br />2.0 1.0 <br />5.5 <br />NA <br />25 <br />