Different uses of valves lined with various materials
Time:
2023-03-31
Introduction to the Use of Lining Valves
Due to the low strength of plastic, many heart doors use gold rot material as their outer shell and plastic, rubber, etc. as their lining. Lining valves are generally suitable for pipelines with a nominal pressure not greater than PN16. Their temperature and corrosion resistance vary with the lining material.
① Plastic lined valves: The corrosion resistance of the plastic lining is the same as that of the corresponding material in the above plastic. However, when selecting, the corrosion resistance of other materials used in plastic lined valves should be considered.
② Rubber lined valves: Rubber is relatively soft, so many valves use rubber as a lining to improve the corrosion resistance and sealing performance of the valve. The corrosion resistance of rubber varies greatly with the type of rubber. Vulcanized natural rubber can withstand the corrosion of non oxidizing acids, bases, and salts, but it is not resistant to the corrosion of strong oxidizing agents such as nitric acid, chromic acid, and concentrated sulfuric acid, as well as the corrosion of petroleum products and certain organic solvents. Therefore, natural rubber is gradually replaced by synthetic rubber. Nitrile rubber in synthetic rubber has good oil resistance, but is not resistant to strong solvents such as oxidizing acids, aromatic hydrocarbons, esters, ketones, and ethers; Fluororubber has excellent corrosion resistance and can withstand various acids, alkalis, salts, petroleum products, hydrocarbons, etc., but its solvent resistance is not as good as fluoroplastics; Polyether rubber can be used in water, oil, ammonia, alkali, and other media.
③ Lead lined valves: Lead is an active metal, but due to its soft material, it is often used as the lining for special valves. The corrosion product film of lead is a strong protective layer. It is a well-known material resistant to sulfuric acid and has high corrosion resistance in media such as phosphoric acid, chromic acid, carbonic acid, neutral solutions, and seawater. However, it is not resistant to alkali and hydrochloric acid corrosion, and is not suitable for working in their corrosion products.
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