External pressure vacuum breather valves, also known as pressure vacuum bleeder valves or breather valves, are an important safety device primarily used to protect storage tanks or other containers from the potentially damaging effects of overpressure or vacuum.
The vacuum breather valve is a device that can automatically open when the pressure inside the container exceeds or falls below the set value to release or inhale gas, thereby maintaining the balance of pressure inside and outside the container.
Overpressure prevention: When the internal pressure of the tank exceeds the set value, the breathing valve automatically opens to release excess gas and prevent the tank from breaking due to overpressure.
Prevent vacuum: flame arresters manufacturer When a vacuum is formed inside the tank and exceeds the vacuum set value, the breathing valve opens to allow air to enter the tank and prevent the tank from being depressed due to vacuum.
Reduce evaporation loss: fire arrestor Reduce evaporation loss of volatile liquids by controlling the pressure in the tank.
The working principle of the vacuum breathing valve is mainly based on the principle of pressure balance. It usually consists of two valve discs, one for controlling positive pressure (overpressure) and the other for controlling negative pressure (vacuum). When the pressure inside the tank changes, the valve disc will automatically open or close according to the preset pressure value to maintain the pressure balance inside and outside the tank.
Structure and material
Structure: The breathing valve is mainly composed of valve body, valve disc, spring, seal and other components. The valve body is usually made of corrosion-resistant materials to cope with various chemical media.
Material: In order to ensure the corrosion resistance and long-term stability of the breathing valve, its key components such as the valve body, valve disc, etc., are usually made of corrosion resistant materials such as stainless steel.
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