Structure is metal and metal hard seal ball Industrial Valves on the mechanism of seal between the sealing ball and seat are metals. The machining accuracy and process is difficult, generally used in high temperature and high pressure, suitable for granular media. Soft seal is sealed between the metal and nonmetal, such as nylon tetrafluoroethylene, manufacturing standards are the same. Sealing material is hard and soft sealing for the seat of the sealing material, hard seal is to use the seat material precision machining, and the Industrial Valves core ( A sphere) Matching accuracy, generally have a stainless steel alloy carbide. Soft seal is set in the seat sealing material for non-metallic materials, because of the soft sealing material has certain elasticity, therefore hard seal will be relatively low demands on machining accuracy. Because of many chemical manufacturing process, mechanical industry working environment is more complex, many of them are high temperature and high pressure, the medium of frictional resistance is big, strong corrosion, now technological progress, all kinds of materials used is better, can keep up with all the aspects of processing, make the hard seal ball Industrial Valves has been widely promoted. Principle and soft sealing actually hard seal ball valve is the same, just because is sealed between the metal, to consider the relationship between the hardness of metal, as well as the working condition, what medium, etc. Are generally required to do hardening treatment, between the ball and seat to grinding to the seal. Hard seal ball valve production cycle is long, processing is more complex, so hard seal ball valve price is much higher. Conditions of use on soft seal generally seal can achieve very high, while hard seal according to the requirements can be high to low; Soft seal need to fire prevention, because at high temperatures, soft sealing material will leak, and hard seal is not the problem; Hard seal generally can do high pressure, soft seal is not; Soft seal due to the problem of flow medium, some occasions is can't use, Some corrosive medium, for example) 。 In manufacturing, both difference is not big, is the seat of the main difference, non-metallic, soft seal is is metal hard seal. MianRuan on equipment selection, selection of hard seal ball valve is mainly on the basis of process medium, temperature and pressure, the general medium containing solid particles or with wear or temperature higher than 200 degrees had better choose hard seal, diameter greater than 50 valve pressure difference is bigger also considered open valve torque size, large torque should choose hard seal fixed ball valve, sealing level for both hard and soft seal can reach level 6.
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