Feeding nominal diameter and nominal pressure of the pneumatic valve

( Nominal diameter, (also known as the average diameter DN mean outside diameter, said symbols, is the general diameter of various kinds of pipe and pipe accessories. The same nominal diameter of the pipe and pipeline fittings can connect each other, are interchangeable. It is not on the actual meaning of pipe diameter or inner diameter, although its value with the pipe diameter is relatively close to or equal to, in order to make the pipe, tube connection dimension is unified, in nominal diameter ( Also known as nominal diameter and nominal diameter. For example, welded steel pipe can be divided by the thickness of the thin wall steel tube, ordinary steel pipe and increasing pipe. Its nominal diameter rather than outside diameter, diameter, but the approximate ordinary steel pipe inner diameter of a nominal size. Each nominal diameter, corresponds to a diameter, its inner value varies with the thickness. Nominal diameter available metric mm said, also can use English in said. Piping accessories also expressed in nominal diameter, meaning is the same tube.

( Nominal pressure, the symbol PN, under a certain temperature applications allow maximum working pressure. Control of the carbon steel pneumatic valve pneumatic valve, refers to ℃ maximum allowable working pressure when the following application; For cast iron pneumatic valve body, refers to ℃ maximum allowable working pressure when the following application; For stainless steel pneumatic valve pneumatic control valve, refers to ℃ maximum allowable working pressure when the following application. When work at higher temperatures, pneumatic valve pressure is reduced. For example, nominal pressure is. MPa（ PN） Carbon steel control pneumatic valve, pressure when used in ℃ for. Pressure for of MPa, when using ℃. Pressure for of MPa, when used in ℃. MPa。