Pneumatic valve nominal diameter

Wuxi east technology co. , LTD. Is a collection of the control valve industry manufacturing, development, production, assembly, sales and service in the integration of science and technology enterprises, professional research and development of electric valve, pneumatic valves, hydraulic valves, pneumatic actuators and various kinds of complete sets of pneumatic valve. Our company produce all kinds of pneumatic ball valves, butterfly valves, plug valves, regulating valve, gate valve, globe valve, flat gate valve and pneumatic device or valve products. ( 公称直径) , also known as the average diameter ( 平均外径) , said sign DN, it is 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.