The ventilation and flame retardant device installed on a fixed roof tank with a PTFE lined flame retardant single exhaust valve can reduce oil evaporation loss, control tank pressure balance, and control flames. It has the characteristics of automatically adjusting the pressure inside and outside the storage tank. There is an electrostatic protection device inside the valve, which keeps the valve at the same potential as the tank at all times.

A single exhaust valve with a connecting pipe (flame retardant) is installed on the top of the storage tank, which is a device for discharging positive pressure gas inside the tank, so that the liquid output inside the tank is not obstructed. When the external liquid enters the tank, a large amount of gas is discharged outward (called positive pressure). If the single exhaust valve with a connecting pipe (flame retardant) automatically closes when stopping work, it will not leak the liquid and gas inside the tank, ensuring the quality of the liquid inside the tank.

A single exhaust valve with a connecting pipe (flame retardant) can not only maintain the pressure balance of the tank, ensure that the tank is not damaged during overpressure, but also reduce the loss of medium inside the tank.

The valve seat with a connecting pipe (flame retardant) single exhaust valve is a gravity type structure. Its characteristic is the soft contact with air cushion between the valve disc and valve seat, which has good air tightness and is not easy to frost and freeze, making it suitable for use in cold areas.

According to the national standard "Fire Protection Design Code for Petrochemical Enterprises" (GB50160-92), "Fixed top tanks for storing Class A and Class B liquids should be equipped with flame arresters and breathing valves.". The new type of single exhaust valve with connecting pipe (flame retardant) is a safety device on fixed top storage tanks such as crude oil, gasoline, kerosene, light diesel, aromatics, etc. It is used to prevent evaporation loss and protect the storage tank from damage when subjected to overpressure.