What material valve should be used for this type of operating condition?
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The valve here is used to control the regeneration of the adsorption tower; the regeneration is carried out using steam, which is saturated steam containing a certain amount of moisture. The valve that controls steam inlet is fine, but the valve that controls the exhaust gas outlet after steam regeneration leaks severely; air leaks from two gaps as well as around the rotating shaft, and tightening the screws to stop the leakage through those gaps doesn’t work. The steam temperature is around 200°C; to control the steam flow, the valve is opened only by a small angle (approximately 45°). After checking the composition of impurities in the feed gas: alcohol
The erosion of this valve is quite severe. It’s not known what the steam pressure is; it is recommended to control the pressure drop across the valve, select an appropriate diameter, and ensure that the opening degree is suitable
Hello, the temperature of this steam is 15 kilograms. Thank you. What material should be used for the valve?
Valves made of 316 material – why did the ball suffer from intergranular corrosion? Intergranular corrosion should not occur under such conditions; valves made of carbon steel would be sufficient
It’s not intergranular corrosion; it’s likely erosion. If there’s a leak in the sealing surface, that’s understandable, but a leakage due to problems with the flange gasket would indicate a quality issue
Some gaskets must be replaced; once there is a leak, it’s no use trying to tighten them further. Tightening them is only necessary at the time of initial use. Once the sealing gasket is damaged, tightening it anymore won’t help – the problem cannot be fixed. This issue often occurs in ball valves. Generally, ball valves are modular in design. When conducting strength tests on the valve body, some manufacturers use press machines for these tests. This method of clamping the valve is not scientific; even valves that were originally leaking will stop leaking as a result of this pressure. Once the clamping devices are removed, the valve will actually start leaking again, though you may not be aware of it.