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Manufacture method for valve core of stop valve used in fermentation

A manufacturing method and technology of globe valves, applied to valve devices, engine components, mechanical equipment, etc., can solve problems such as damage, frequent opening of valves, indentation of sealing surfaces, etc., and achieve the effect of stable network structure

Active Publication Date: 2014-03-26
ZHENJIANG FENGZE BIOTECH EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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Embodiment 1

[0030] The manufacturing method of a stop valve spool for fermentation provided in this embodiment uses chromium-molybdenum low-alloy steel as the blank, and the mass percentage composition of the chromium-molybdenum low-alloy steel is: carbon: 0.3%, silicon: 0.18%, manganese: 0.50 %, chromium: 0.90%, molybdenum: 0.20%, phosphorus: 0%, sulfur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0%, 0-0.9% residual elements, the rest Be Fe; The manufacturing method specifically includes the following steps:

[0031] Step (1): Heat the above-mentioned billet to 880°C, repeatedly upsetting and drawing the billet along the two mutually perpendicular diameter directions of the axial cross-section into a round steel bar of the required size, air-cool to 360°C and keep it warm for 420 minutes;

[0032] Heating the round steel bar to 870°C again, casting the central hole along the diameter direction of the round steel bar, and smoothing the outer surface and the inner surface of t...

Embodiment 2

[0042] This embodiment provides a method for manufacturing a stop valve core for fermentation, using chromium-molybdenum low-alloy steel as the blank, and the component content of the chromium-molybdenum low-alloy steel includes the following components in mass percentages, carbon: 0.31%, Silicon: 0.36%, Manganese: 0.70%, Chromium: 1.10%, Molybdenum: 0.30%, Phosphorus: 0.02%, Sulfur: 0.025%, Hydrogen: 1.8ppm, Nickel: 0.40%, Vanadium: 0.03%, Copper: 0.30%, 0-0.9% residual elements, the rest is Fe; the manufacturing method specifically includes the following steps:

[0043] Step (1): Heat the above-mentioned billet to 920°C, repeatedly upsetting and drawing the billet along the two mutually perpendicular diameter directions of the axial cross-section into a round steel bar of the required size, air-cool to 360°C and keep it warm for 420 minutes;

[0044] Heating the round steel bar to 810°C again, casting the central hole along the diameter direction of the round steel bar, and ...

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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 large economic losses. 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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46F16K51/00
Inventor 王泳胜王守江冯军
Owner ZHENJIANG FENGZE BIOTECH EQUIP MFG
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