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What are the basic parameters of a valve?
The basic parameters of valves are as follows: The nominal diameter is a rounded value used as a reference to indicate the size of the valve; it is denoted by “DN*”. For example, a DN100 valve corresponds to a 4-inch valve, while a DN200 valve corresponds to an 8-inch valve. The nominal pressure is a rounded numerical value that represents the pressure rating of the valve; it can be expressed as PN6.3MPa or Class400, for instance. Valves can be used to handle various types of media, including gaseous, liquid, media containing solids, corrosive media, and highly toxic substances. The test pressures include the strength test pressure and the sealing test pressure. The sealing mechanism of a valve consists of the valve seat and the closing element; sealing is achieved by ensuring that the sealing surfaces of these components come into close contact with each other or by causing plastic deformation of the sealing surfaces under pressure.
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