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Vent valves with dual nozzles (for inhalation and exhalation, as well as flame arrestment) are essential safety devices for fixed-roof storage tanks used to store crude oil, gasoline, kerosene, aviation fuel, light diesel, aromatics, propylene, nitrogen, etc. They prevent evaporative losses and protect the tanks from damage in cases of overpressure or vacuum. A breathing valve with a nozzle (flame arrester) is a safe and energy-efficient product that helps maintain pressure balance in storage tanks and reduces the evaporation of the medium. A breathing valve is a ventilation and flame arrestment device installed on fixed-roof tanks; it helps to reduce oil evaporation losses, maintain pressure balance in the tank, and control flames. It features the ability to automatically adjust the positive and negative pressures inside and outside the storage tank. This series of breather valves is equipped with an electrostatic protection device, which ensures that the valve always maintains the same electrical potential as the tank. Standard application specifications for breathing valves with dual nozzles: 1. Flange standards: GB, HG, SH, HGJ, JB, ANSI, JIS, and other standards. (User-specified; please indicate the pressure rating); 2. Manufacturing and testing standards: Manufactured and inspected in accordance with standards such as (Breath valves for oil storage tanks) SY7511-87, (Fire suppression performance and testing methods for fire arresters in oil storage tanks), GB/T5908-2005, GB/T50160-2012, GB/T13347-92, etc.; or standards specified by the user; 3. Main material: Cast steel, carbon steel WCB, stainless steel 304SS, 316, 316L, etc.; 4. Nominal pressure: 0.6MPa, 1.0MPa, 1.6MPa, 2.5MPa; American standards: 75LB, 150LB. When placing an order, please specify detailed parameters such as product name, nominal diameter, pressure rating, material, flange standard, operating pressure, and medium.