Manufacturing method of stop valve spool for fermentation

Abstract

The invention discloses a manufacture method for a valve core of a stop valve used in fermentation. According to the invention, Cr-Mo low alloy steel is adopted as a blank, and the Cr-Mo low alloy steel comprises the following components in percentage by mass: 0.3%-0.31% of carbon, 0.18%-0.36% of silicon, 0.50%-0.70% of manganese, 0.90%-1.10% of chromium, 0.20%-0.30% of molybdenum, 0-0.02% of phosphorus, 0-0.025% of sulfur, 0-1.8 ppm of hydrogen, 0-0.40% of nickel, 0-0.03% of vanadium, 0-0.30% of copper, 0-0.9% of residual elements and the balance of Fe, and the valve core is obtained by coating polytetrafluoroethylene upon the blank through a wet method. According to the invention, the valve core of the stop valve used in fermentation, obtained through adopting the designed manufacture method provided by the invention is good in toughness and has an excellent corrosion resistance and antibacterial property.

Description

technical field [0001] The invention relates to the field of bioengineering equipment, in particular to a method for manufacturing a stop valve core for fermentation. Background technique [0002] The fermentation process of the pharmaceutical industry is highly technical and has high requirements for equipment. However, "contamination", that is, in the process of pure microbial culture, the phenomenon of other microorganisms in addition to the target bacteria occurs from time to time. cause more economic loss. Production practice shows that in addition to human operation factors, the fermentation bacteria caused by equipment account for a large proportion of the causes of fermentation contamination. Fermentation valves can also cause fermentation failures. Therefore, enterprises should first establish the concept of "prevention first" and start from equipment to eliminate various hidden dangers that may cause fermentation contamination. [0003] The valve core is the ma...

AI Technical Summary

Problems solved by technology

[0003] The valve core is the main equipment of the valve. The sealing performance of the valve core and whether there will be leakage are very important for the success of fermentation. At present, mechanical seals are widely used in fermentation valves, which replace the filler of the previous stirring shaft. However, if the mechanical seal system of the valve core is not suitable, the shaft seal will still leak and cause bacterial contamination.

[0004] During the fermentation process, the valve opens frequently, and is often damaged by medium corrosion, erosion and cavitation, especially the sealing and anti-corrosion and anti-bacterial properties of the part where the valve seat and the valve core are in contact with each other are very important. The sealing of the valve secondary structure is divided into There are two kinds of soft seal and hard seal. The sealing structure of the hard seal is formed by a small elastic-plastic deformation of the valve seat and the valve core to form a closed circular sealing contact line, although the sealing effect of this type of valve is good in the initial stage of application , but the fermentation valve is opened more frequently, it is easy to wear the contact line formed previously, or the sealing surface is damaged due to indentation due to unclean pipeline, which makes the fermentation fail