AAK relief valve has already used Korean piano steel wire instead of carbon steel as the core material of pressure spring for a long time, which completely solves the vibration and noise problems caused by the deformation of pressure spring, which is not the only advantage of AAK relief valve. At present, nearly 90% of the factories can't do it, even if they think about it, they don't do it.
In the domestic market, many manufacturers do use carbon steel as pressure spring for relief valve. Carbon steel is cheap, easy to process and has high production efficiency. However, there may be a hidden and fatal problem. The hardness of carbon steel increases with the increase of carbon content, which leads to the decrease of plasticity and toughness, the weakening of tensile strength and the deterioration of stability. https://aakindustry. com/article/list_c0000
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