Protectoseal Series 30, ½” Spring Operated Tank Blanketing Valve is designed to regulate the flow of a blanketing gas (usually Nitrogen) into the vapor space of a flammable liquids storage tank. The Series 30 valve is spring operated. The pressure balanced poppet is held in its closed position by direct spring force. The valve senses the pressure in the vapor space and opens (in opposition to the setting spring force) to allow a flow of gas into the tank when the tank pressure drops below the valve’s set point. When tank pressure returns to near the valve’s set point the flow of gas is stopped. The ½” size is suitable for use on smaller tanks and vessels. Datasheet