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P AS SURE-VACUUM VEPS - 548 & 548A 748 & 748 A Y PRESSURE-VACUUM VENT :T PRESSURE-VACUUM ' VENT WITH GAUGE HATCH For'normal"venting of Aboveground Stor- For"normal"venting of Aboveground Stor- age Tanks. Allows tank to'breath"during age Tanks. Allows tank to'breath"during filling and withdrawing operations.Pressure- filling and withdrawing operations.Pressure- "'''-" vacuum poppets seat vapors in the tank when vacuum poppets seal vapors in the tank when " 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 40,000 749 SERIES PRESSURE-VACUUM VENT x Vent valve used on underground&low volume aboveground tanks for motor 748 ALT fueling. Vent allows tank to'breath" during filling/dispensing operations. Poppets seal vapors in the tank when PRESSURE-VACUUM pressure is equalized. Settings are VENT FIG 749 approximate. CONSTRUCTION DETAILS •_• - FOR AG-CHEMICAL Warning:FIG 749 PN Vent must only FIG 749-2"NPT be used in conjunction with motor Vent valve used with aqua amonia and FIG 749 S-2"Slip-on style fueling and/or low capacity flow.Fluid ag-chemical products allowing tank to FIG 749 CRB-2"NPT C.A.R.B. handling in lines larger than that used "breathe"during loading/unloading op- approval(95-15A)for Stage I& for retail service station can cause FIG 748 ALT erations. Poppets seal vapors in the If.Viton O-rings on pressure tank to rupture or implode. tank when pressure is equalized. Set- poppet. I I CONSTRUCTION DETAILS tings are approximate. FIG 749 CRBS-2"Slip-on style Pressure Vacuum Ship Venting Size....................................2"NPT C.A.R.B.approval(95-15A)for Setting Setting Weight Capacity Body and Cap...••••.•..••••Aluminum \� Stage I& II.Viton 0-rings on Poppets......••.Teflon Coated Alum Pressure Vacuum Ship Venting (oz/sq in) (oz/sq in) (LBS) (CFH) pressure poppet. 2.5 PSI Screens•.••............Stainless Steel Setting Setting Weight Capacity FIG 749&749 S (@° ) Option: (Must specify) (Ibs/sq in)(oz/sq in) (LBS) (CFH) eci male (@2.5 PSI) Body -• Aluminum 8.0 0.5 1.0 8,500 NPT connection for dryer appli- Pressure Poppet... Aluminum 12.0 0.5 1.0 8,500 cation. Vacuum Poppet.......... Brass FIG 749 CRB&749CRBS Option: Pressure discharge 0.5 1.0 5.5 20,200 ar Seal.................. Buna-N 3"W.C. 8"W.C. 1.2 p 9 1.0 1.0 5.5 18,0 A Brass 8 oz. 5 oz. 1 2 NPT hood available. 2.0 1.0 5.5 NA Screen........................... 25