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FIG 748A

Pressure Vacuum Vent - 3” Aluminum

Pressure vacuum vent designed for installation on top of the vent pipe of an aboveground storage tank. Poppets seal vapors in the tank when pressure is equalized. The vent allows the tank to breathe during filling and dispensing operations. This vent must be used in conjunction with an emergency vent. It is recommended that the opening pressure setting is set below that of the emergency vent so the normal vent operates first. Settings are approximate.

Product Features

Standard Features

Vents outward and upward in compliance with NFPA 30

Tri-polar mounting screws for mounting exhaust hood in any of three positions

Optional dryer connections accommodate the installation of desiccant dryers on vacuum connection

Product Ordering Instructions

Fig Suffix Size Description Weight
748A 3100 AV 3” 2oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 3200 AV 3” 4oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 3300 AV 3” 6oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 3400 AV 3” 8oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 3500 AV 3” 12oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 3600 AV 3” 16oz/sq.in. Pressure Vacuum Vent, Aluminum Body
748A 4100 AV 3” 2oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection
748A 4200 AV 3” 4oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection
748A 4300 AV 3” 6oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection
748A 4400 AV 3” 8oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection
748A 4500 AV 3” 12oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection
748A 4600 AV 3” 16oz/sq.in. Pressure Vacuum Vent, Aluminum Body, With Dryer Connection