The valve body adopts the gas dynamics direct flow channel design, large inlet and exhaust port size, high flow rate Power fast exhaust port and micro automatic exhaust port, dual exhaust port design. When you purchase this item, you will receive 1 exhaust valve, not 3! Integral float anti-puffing design prevents high-speed airflow from blowing up the float and closing the exhaust port prematurely*0.2bar/1.5psi low-pressure power seal design, good sealing to reduce leakage PA material, corrosion resistance, acid and alkali resistance, long service life A variety of installation caliber design, to meet the needs of different stingy households Working Principle of Automatic Air Venting Valve Automatic air venting valves are usually installed at the highest and localized high points of a system's piping to remove air stored in the plumbing. The operating principle of the automatic air vent is to use the buoyancy of water to block the air vent. When the highest point of the pipeline stored air, the buoyancy of the water is reduced or no longer, the vent is opened, under the action of the pressurized water, the air from the exhaust port, the air is discharged, the air is discharged, the buoyancy of the water acts on a simple mechanical device to block the air vent. Unlike the venting of air collection tanks, automatic air venting valves do not require manual operation.