This paper researches experimentally the colour results of metabisulfite with various acidvalve, and measuring the relation between solution electric potential and store time.
Therefore transportation of sulphuric acidvalve is usually a high silicon iron pump (casting and machining difficult), high-alloy stainless steel pumps (on the 20th alloy) manufacturing.
因此输送硫酸的泵阀通常采用高硅铸铁泵(铸造及加工难度大)、高合金不锈钢泵(20号合金)制造。
3
Heartburn, also know as acid reflux, is caused by progesterone relaxing the valve separating the esophagus from the stomach, allowing acids to seep up the pipe.