corrosion is one of the important elements of the valve damage. In the valve protection valve anti-corrosion is, therefore, consider an important issue. corrosion should how to do? Here introduced nine anticorrosive little tips for you! 1, according to corrosion medium corrosion of materials in practical production, the medium corrosion is very complex, even in a medium used in the valve material sample, the concentration of the medium, temperature, pressure, medium on the material corrosion is different also, each medium temperature 10 ℃, the corrosion speed of about 1 ~ 3 times. A great influence on the valve material corrosion medium concentration, as lead in the concentration of sulfuric acid, corrosion is very small, when the concentration of more than 96%, corrosion has risen sharply. And carbon steel, by contrast, in the sulfuric acid concentration of corrosion is most serious, about 50% when the concentration increased to more than 6%, the corrosion but fell sharply. Aluminum in the concentration of more than 80% nitric acid corrosive is very strong, but in the medium and low concentration of nitric acid corrosion serious instead. Although stainless steel for dilute nitric acid corrosion resistance is very strong, but in more than 95% nitric acid corrosion aggravate. Can be seen from the above a few cases, choose correct valve material shall be according to the specific situation, analyzed various factors influencing the corrosion, choose materials according to relevant anti-corrosion manual.

2, non-metallic materials

non-metallic corrosion resistance is good, as long as the valve use temperature and pressure in line with the requirements of non-metallic materials, not only can solve the problem of corrosion, and can save precious metals. Of the valve body, valve cover, liner, common non-metallic materials, such as sealing surface for gasket, packing mainly is made of nonmetal materials. With ptfe, plastics, such as chlorinated polyether, and using natural rubber, neoprene, nitrile butadiene rubber lining rubber valve, the valve body, valve cap body is generally made from cast iron, carbon steel. Ensure the strength of the valve, and guaranteed the valve from corrosion. Clip pipe Industrial Valves is according to the excellent corrosion resistance and excellent performance of rubber and designed, now more and more with nylon, teflon, such as plastic, made all kinds of natural rubber and synthetic rubber sealing surface, sealing ring, for all kinds of valves. These used as the sealing surface of nonmetal material, not only good corrosion resistance, and good sealing performance, especially suitable for granular medium is used. Of course, their strength and heat resistance is low, application scope is limited. The appearance of the flexible graphite non-metallic entered the field of high temperature, solved the difficult to solve the problem of the packing and gasket leaking for a long time, and is a very good high temperature lubricant.

* non-metallic materials commonly used the suitable operating mode

3, metal surface treatment

( 1) connection

valve connection bolt used galvanized, chrome plating, oxidation ( Blue) Processing to enhance the capacity of air resistance, resistance to corrosion medium and other fasteners in addition to dealing with the above mentioned methods, also according to the situation by phosphating surface treatment, etc.

( 2) The closing of the sealing surface and the diameter is a

often use the surface such as nitriding, boronizing process, to improve its corrosion resistance and wear resistance, 38 crmoala disc, nitriding layer 0 or higher. 4mm。

( 3) Stem anticorrosive

widespread adoption of nitriding, boronizing, chrome plating, nickel plating surface treatment technology, such as to improve its corrosion resistance, corrosion resistance and wear abrasion performance. The valve stem of the different surface treatment shall be suitable for different materials and work environment, in the atmosphere, water vapor medium contact with asbestos packing stem, hard chrome plating, gas nitriding process can be used ( Unfavorable use stainless steel ion nitriding process) ； In the hydrogen sulfide in the atmospheric environment valve adopts high phosphorus plating nickel coating has better protective performance; 38 crmoala adopts the ion and gas nitriding can also be corrosion resistant, but unfavorable use hard chromium plating; 2 cr13 after quenched and tempered ingeneral, ammonia corrosion of carbon steel using the gas nitriding also capable of ammonia corrosion, and all the phosphorus nickel plating not ammonia corrosion resistance; After gas nitriding 38 crmoala material with excellent corrosion resistant performance and comprehensive performance, use it to make the valve stem.

( 4) Small diameter of the valve body and the handwheel

often chrome plating processing, to improve the corrosion resistance and decorative valves.

4, thermal spraying

thermal spraying is a square in the preparation of coating technology, has become one of the new technology of material surface protection. Most metals and their alloys, metal oxide ceramics, ceramic composites and hard metal compounds can use one or several of the thermal spraying methods, form a coating on the metal or nonmetal substrate. Thermal spray can improve the surface corrosion resistance, wear resistance, high temperature resistant performance, prolong service life. Thermal spraying special functional coatings, heat insulation, insulation, Or electricity) , can seal, self-lubricating, thermal radiation, electromagnetic shielding special performance, such as using thermal spraying can repair parts.

5, spray coating

coating is one of the most widely used anticorrosion means, on the valve products is a kind of indispensable anticorrosion materials and identification marks. Coatings also belong to non-metallic materials, it usually consists of synthetic resin, rubber slurry, vegetable oil, solvent mixture, such as covering the metal surface, isolation medium and the atmosphere, anti-corrosion. Coating is mainly used for water, salt water, sea water, atmospheric corrosion environment is not too strong. lumen commonly used anti-corrosion paint besmear to brush, prevent water, air and other media on valve corrosion. Paint mixed with different colors, used to indicate the valve material, valve spray coating, generally in the six months to one year at a time.

An increasing dependence on the use of ductile iron gate valve resilient seal gate valve has made numerous changes in the resilient valve industry over the past decades.
Shenzhen Mech Valve Trading Co., Ltd. has had manufacturing experience for over y gate valve years. She currently runs a website where they sell . You can visit her site at Mech Valve.
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