What is the difference between a fire valve and a fire breathing valve. Does anyone know of a fire v

The working principle of the flame retardant breathing valve is to use a spring limiting valve plate, which is determined by the positive and negative pressure to exhale or inhale. The breathing valve should have the function of releasing positive pressure and negative pressure. Specifically: When the container is under positive pressure, the breathing valve opens to release the positive pressure of the exhaled gas when the container is under negative pressure, making it flame retardant. the breathing valve opens to release the negative pressure of the inhaled gas. This ensures that the pressure is within a certain range and the safety of the container is ensured. The first is to exhale or inhale when a certain pressure is reached. The other is designed to simply breathe without breathing. This can be understood as its replacement with two one-way valves with appropriate pressure. The respiratory valve iFire retardant can not only maintain the air pressure balance of the storage tank and ensure that the storage tank is destroyed in the event of overpressure or vacuum, but also can reduce the fluid and loss in the tank. This type of valve must generally be installed horizontally in pipelines.