There are several safety valve classification methods: (1) According to the overall structure and structure of the load structure can be divided into hammer lever type, spring type and control type 3; (2) according to the valve opening height and valve flow diameter Ratio can be divided into two types of micro-Kai and full Kai-type safety valve; (3) According to the way of gas emissions can be divided into fully enclosed, semi-closed and open three. The safety valve must be shipped with the product quality certificate, and the product installed on a solid metal nameplate. Metal nameplate shall indicate the following: (1) manufacturing unit name, manufacturing license number; (2) model, type, size; (3) product number; (4) nominal pressure, MPa; Diameter, mm; (6) emission factor; (7) test pass mark; (8) the factory date. Safety valve for pressure vessels, the metal nameplate should also indicate the applicable medium, temperature. Safety valve discharge coefficient should be determined by the safety valve manufacturing unit test.
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