Emergency Pressure Vents are designed to provide emergency relief capacity beyond that furnished by the operating vent on tanks. The Series No. 7800 vents do not provide vacuum relief. Series No. 18540 or Series No. Under normal operating conditions, the vent pallet assembly is closed providing an effective vapor seal.
Vapor is expelled, thereby protecting the tank from dangerous over-pressurization.
Pallet assembly automatically closes and reseals when the pressure is reduced. The Protectoseal Company 225 W. Foster Ave.