is the control unit in fluid conveying system, with a cut-off, regulation, guide, to prevent the reverse flow, voltage regulator, the leakage of the shunt or overflow, and other functions. Used for fluid flow control system of the Industrial Valves, from the most simple cut-off valve to extremely complex automatic control system used in all kinds of valves, its quite a wide varieties and specifications. The corrosion of the valve, is generally understood as the valve metal materials in the chemical or electrochemical environment under the action of the damage. As a result of 'corrosion' phenomena appeared in the metal and the surrounding environment of spontaneous interaction, how the metal with the surrounding environment or more isolated from the use of non-metallic composite material, is the key point of anti-corrosion. body including cover, occupy most of the weight of the valve, and is often contact with the medium, so choose the valve, often from the valve body material. Body of anticorrosion, main is correct to choose material. Although anticorrosion materials is very rich, but can choose appropriate, or not easy thing, because the problem of corrosion is very complex, such as sulfuric acid at low concentrations to steel corrosion resistance, high concentration, make steel passivation membrane, corrosion resistance; To show only under high temperature and high pressure hydrogen corrosion of steel is very strong, chlorine gas in the dry state when corrosion is not large, with a certain humidity, strong corrosion performance of many materials can't use. Choose the difficulty of the body material, also is not only considered the corrosion problem, at the same time must consider pressure and heat-resistant ability, economically reasonable, buy whether factors such as easily. So you have to is in the heart. Body corrosion, comes in two forms, namely, chemical corrosion and electrochemical corrosion. The corrosion rate of it depends on the medium temperature, pressure, chemical properties and corrosion resistance of the body material. Corrosion velocity can be divided into six: 1, complete corrosion: corrosion speed below zero. 001 mm/year; 2, corrosion resistant, corrosion speed of 0. 001 to 0. 01 mm/year; 3, corrosion resistant, corrosion speed of 0. To 0 01. 1 mm/year; 4, it is corrosion resistant, corrosion speed of 0. 1 to 1. 0 mm/year; 1 5, poor corrosion resistance: the corrosion rate. 0 to 10 mm/year; 6, no corrosion, corrosion speed is greater than 10 mm/year. Followed by lining measures, such as lining, lining aluminum, lead lining engineering plastics, lining natural rubber and various synthetic rubber, etc. Such as medium conditions permit, it is a way to save. And in the case of pressure, temperature is not high, made the valve body material, non-metallic often can effectively control the corrosion. The body surface by atmospheric corrosion, steel materials are usually protection by paint.
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