Pressure/Vacuum Relief Valve

A breathing valve is a specialized safety accessory used for storage tanks (such as those for petroleum, chemical, food and other liquid storage tanks). Its core function is to automatically regulate the internal pressure of the tank, preventing deformation or damage caused by overpressure or vacuum. When the pressure inside the tank rises beyond the set value due to factors such as temperature changes or filling and unloading operations, the breathing valve automatically opens to release pressure (exhale). When the pressure drops to the negative set value, it automatically opens to inhale and replenish pressure, thereby maintaining the tank pressure within a safe range. At the same time, the breathing valve effectively reduces product evaporation loss and minimizes atmospheric pollution. Common types produced by Zhejiang Shanliu Valve Technology Co., Ltd. include all-weather breathing valves, explosion-proof flame arrester breathing valves, and recovery type with connection pipes. Materials can be selected from aluminum alloy, stainless steel, carbon steel, etc. These valves are widely used in petrochemicals, oil depots, chemical industries, and environmental protection fields.