Morrison Bros 748A-3200 AV 3" FNPT Pressure Vacuum Vent - 20.2k SCFH Venting capacity 2.5 P.S.I.

Pressure vacuum vent designed for installation on top of the vent pipe of an aboveground or underground 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.

NOTE: Normal vents such as pressure vacuum and updraft vents for aboveground storage tanks should be sized according to NFPA 30 (2012) 21.4.3.

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
Optional pressure discharge hood facilitates piping pressure relief to desired discharge point

Construction Details

• Body and hood: Aluminum
• Poppets: Brass
• Seats: Passivated aluminum
• Screens: Stainless steel