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For the water supply system to operate in automatic mode, it is necessary to install a closed diaphragm-type expansion tank with a pneumatic accumulator of appropriate volume, because pressure switches can only work in conjunction with an expansion tank. An expansion tank is a device built into the water supply system to maintain the required pressure, ensuring the system is constantly ready to operate under stable pressure. Functions: Accumulation of water under constant pressure, allowing the pump to switch on not immediately when water is drawn from the water supply system, but only as the amount of liquid (pressure) in the expansion tank decreases; reserve water supply in the water supply system. Technical specifications: Metal body made of painted alloy steel; The membrane used in the expansion tank is made of synthetic ethylene-propylene rubber EPDM. Operating conditions: Maximum ambient temperature: +40ºС; Maximum temperature of accumulated liquid: +99ºС; Recommended pressure in the air cavity from 1.5 to 1.6 bar; Maximum pressure in the water supply system up to 8 bar; Warranty period