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Soft seal gate valve and hard seal gate valve manufacturing process: due to the complex working environment of many petroleum, chemical and mechanical industries, many are high temperature and high pressure, the friction resistance of the medium is large, strong corrosion, the sealing material requirements of the valve are strict. With the continuous progress of science and technology, the application of various metal materials technology is more and more mature, processing technology and other aspects can keep up, so that hard sealed ball valves are widely promoted. And the principle of hard seal gate valve and soft seal is the same, just because it is the seal between the metals, to consider the hardness relationship between the metals, as well as the working condition, what kind of medium and so on. It is generally required to do hardening treatment, between the ball and the seat to go through a strict grinding process to make it meet the sealing requirements. Hard seal gate valve production cycle is long, processing is more complex, hard seal ball valve is not easy to do.