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PRASURE-VACUUM VD& 548 & 548A 748 & 748 A PRESSURE -VACUUM 77:PRESSURE-VACUUM VENT VENT WITH GAUGE HATCH For "normal" venting of Aboveground Stor- For "normal" venting of Aboveground Stor- age Tanks. Allows tank to "breath" duringInsh` age Tanks. Allows tank to "breath" during filling and withdrawing operations. Pressure - filling and withdrawing operations. Pressure .4 vacuumpoppetssealvaporsinthetankwhen vacuum poppets seal vaporsinthetankwhen pressure is equalized. This vent must be pressure is equalized. This vent must be FIG 548 used in conjunction with an emergency vent FIG 748 used in conjuction with an emergency vent and it is RECOMMENDED that the opening and it is RECOMMENDED that the opening pressure setting is set below that of the emer- pressure setting is set below that of the emer- gency vent so the normal vent relieves first. gency vent so the normal vent relieves first. CONSTRUCTION DETAILS CONSTRUCTION DETAILS FIG 548...................Brass Body and Hood. FIG 748 .................. .Stainless Steel Poppets. FIG 548 A................Aluminum Body and Hood. FIG 748 A ............... Brass Poppets (Fig 748 available in 2.0 oz/ sq in pressure - 1.0 oz/ sq in Vacuum only) Standard Features: 1. Brass (raised) metal -to -metal Seats/Poppets. Standard Features: 2. Threaded Gauge Hatch for manual gauging access. 1. Aluminum Body and Hood. 3. Horizontal Discharge and field -adjustable, tripolar orientation. 2. Horizontal Discharge with field -adjustable tripolar orientation. Size Pressure Vacuum Fig 548 Fig 548A Venting Size Pressure Vacuum Fig 748 Fig 748A Venting Setting Setting Ship Ship Capacity Setting Setting Ship Ship Capacity (oz /sq in) (oz /sq in) Weight Weight (CFH) (oz /sq in) (oz /sq in) Weight Weight (CFH) (LBS) (LBS) (@2.5 PSI) (LBS) (LBS) (@2.5 PSI) 2" 2.0 1.0 13.25 7.00 20,200 2" 2.0 1.0 13.25 7.00 20,200 2" 4.0 1.0 13.75 8.75 20,200 2" 4.0 1.0 NA 8.75 20,200 2" 6.0 1.0 14.25 8.50 20,200 2" 6.0 1.0 NA 8.50 20,200 2" 8.0 1.0 14.75 9.50 20,200 2" 8.0 1.0 NA 9.50 20,200 2" 12.0 1.0 15.75 10.50 18,600 2" 12.0 1.0 NA 10.50 18.600 2" 16.0 1.0 17.00 11.25 18,000 2" 16.0 1.0 NA 11.25 18,000 3" 2.0 1.0 26.25 12.25 43,000 3" 4.0 1.0 27.25 13.75 43,000 3" 6.0 1.0 28.25 15.00 43,000 3" 8.0 1.0 28.75 15.75 43,000 3" 12.0 1.0 29.25 15.75 40,000 3" 16.0 1.0 33.25 20.50 40,000 FIG 749 CONSTRUCTION DETAILS FIG 749 - 2" NPT FIG 749 S - 2" Slip-on style FIG 749 CRB - 2" NPT C.A.R.B. approval (95-15A) for Stage I and ll. Viton 0 -rings on pressure poppet. Body ..................... Aluminum Pressure Poppet... Aluminum Vacuum Poppet.......... Brass Seal........................... Buna-N Screen ........................... Brass 749 SERIES PRESSURE -VACUUM VENT Vent valve used on underground & low volume aboveground tanks for motor fueling. Vent allows tank to "breath" during filling/dispensing operations. Poppets seal vapors in the tank when pressure is equalized. Settings are approximate. Warning: FIG 749 PN Vent must only be used in conjunction with motor fueling and/or low capacity flow. Fluid handling in lines larger than that used for retail service station can cause tank to rupture or implode. Pressure Vacuum Ship Venting Setting Setting Weight Capacity (oz /sq in) (oz /sq in) (LBS) (CFH) (@2.5 PSI) FIG 749 & 749 S 8.0 0.5 1.0 8,500 12.0 0.5 1.0 8,500 FIG 749 CRIB 3"W.C. 8" W.C. 1.2 8 oz. 5 oz. 1.2 WARNING: Obstruction of airflow through vents can result in structural deformation of the tank. Atmo- spheric conditions and below freezing temperatures may cause condensation to occur and freeze. Freezing action can restrict movement of poppets and block screened air passages. Monthly inspection and more frequent inspection in cold weather by someone famil- iar with the proper operation of this vent is required to help guard against accidental damage to the tank. For further instructions contact: Morrison Bros. Co. Dubuque Iowa (319) 583-5701. CONSTRUCTION DETAILS Size....................................2" NPT Body and Cap...............Aluminum Poppets ......... Teflon Coated Alum Screens ................. Stainless Steel Option: (Must specify) - male NPT connection for dryer appli- cation. 748 ALT PRESSURE -VACUUM VENT FOR AG -CHEMICAL Vent valve used with aqua-amonia and ag-chemical products allowing tank to "breathe" during loading/unloading op- erations. Poppets seal vapors in the tank when pressure is equalized. Set- tings are approximate. Pressure Vacuum Ship Venting Setting Setting Weight Capacity (Ibs /sq in)(oz /sq in) (LBS) (CFH) (@2.5 PSI) 0.5 1.0 5.5 20,200 1.0 1.0 5.5 18,000 2.0 1.0 6.0 NA 25