Safety valve mainly has the following classification methods: (1) According to the overall structure and the structure of the load can be divided into heavy hammer lever type, spring type and control type 3; (2) according to the valve opening height and valve circulation diameter The ratio can be divided into two kinds of micro-valve and full-open safety valve; (3) According to the gas discharge can be divided into three kinds of fully enclosed, semi-closed and open. The safety valve must be shipped with a product quality certificate and a strong metal nameplate must be installed on the product. The following shall be stated on the metal nameplate: (1) Name of manufacturing unit, manufacturing license number; (2) Type, type, specification; (3) Product number; (4) Nominal pressure, MPa; (5) Valve seat throat Diameter, mm; (6) Emission factor; (7) Inspection mark; (8) Year of the factory. For safety valves for pressure vessels, the metal nameplate must also indicate the applicable media and temperature. The emission factor of the safety valve shall be determined experimentally by the manufacturer of the safety valve.
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