Abrasive corrosive-resisting butterfly valve, its production and forming mould

Abstract

The invention is about the amelioration to the wearing and corrosion resistant butterfly valve, the character is that at least the valve plate surface coat is a elastic mass which is a resistance to acid, alkali-proof and pouring polyurethane. At least the valve plate which is the easiest to be abraded is coated by the polyurethane, it can greatly improve wearing and resistant ability of the valve plate, also can greatly improve the acid- resisting, alkali-proof and chloride ion-resisting ability, so it can prolong the operating life of the butterfly valve. There are warp lining betweens the lining in overflowing part of the valve body and the body of valve for anchoring, it can greatly enhance the firm ability of the lining and the valve body, and will not make the lining slough, it is especially the same with the heavy caliber such as the 500-1000mm latus rectum butterfly valve.

Description

technical field [0001] The invention relates to the improvement of the wear-resistant and corrosion-resistant butterfly valve, in particular to a wear-resistant and corrosion-resistant butterfly valve with a longer service life in the flue dust wet desulfurization system. Background technique [0002] The most abrasive part of a butterfly valve is the valve plate. Existing wear-resistant and corrosion-resistant butterfly valves, such as butterfly valves used in soot wet desulfurization systems, usually use stainless steel valve plates, and rubber and plastic coated valve plates. The flue dust wet desulfurization circulating fluid not only has a particle solid content of 5-15%, but also has alkaline substances such as calcium hydroxide, magnesium hydroxide, sodium hydroxide, or ammonium hydroxide in the desulfurization circulating fluid due to different neutralization media. , and the circulating fluid becomes acidic after the neutralization medium is absorbed and saturated,...

AI Technical Summary

Problems solved by technology

The stainless steel valve plate is not only not wear-resistant enough, but also not resistant to chloride ion corrosion. Usually, in the above-mentioned environment, the service life is only 5-6 months (flow rate 4m / s); rubber-coated valve plate, because the rubber vulcanizing agent is alkali If the valve plate is used in alkaline circulating fluid for a long time, it will cause the rubber layer to swell and soften, reduce the mechanical strength, and reduce the wear resistance. Usually, the service life is only about one year (flow rate 4m / s); plastics such as polypropylene , PE, FEP coated valve plate, although it has good acid and alkali resistance, but the wear resistance is not enough, the service life is only about 7-8 months (flow rate 4m / s)

However, the power flue dust desulfurization system requires an overhaul period of more than 2 years. Such a low service life of the butterfly valve increases the frequency of replacement and shortens the overhaul period, which not only increases the cost of use, but also causes abnormal operation of the desulfurization equipment due to the short replacement period. increased operating costs

[0003] In addition, for large-caliber butterfly valves (for example, the diameter is above 400mm), the anti-corrosion lining area of ​​the valve body has a large area of ​​anti-corrosion lining. Used in heat alternating circulating fluid, it is very easy to cause cracking and peeling of the lining layer, resulting in damage to the lining layer and affecting the anti-corrosion function

[0004] Therefore, currently used in wet desulfurization projects with large circulating liquid and solid content, such as butterfly valves in power plants and metallurgical systems, the service life is short, which has become a major obstacle in the industry. Although people try to improve the service life of butterfly valves in various ways, there is no success. big change

Images