Classification and characteristics of ball valve
Ball valve is divided into: floating ball valve, ball valve, ball valve, ball valve, three ball valve, stainless steel ball valve, stainless steel ball valve, ball valve, ball valve, three ball valve, pneumatic ball valve, pneumatic ball valve, electric valve, ball valve, ball valve, welded ball valve.
By shell / subject material classification, ball valve can be divided into:
Metal material valve: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium valves, Monel valves, copper alloy valves, aluminum alloy valves, lead alloy valves.
2 metal body lined valves: valve, lined valves, lined valves, lined valves, lined valves, lined valves, lined valves.
3 non metal materials, such as ceramic valves, glass valves, plastic valves.
According to the connection can be divided into: thread ball valve, flange ball valve and ball valve.
Domestic production of ball valve manufacturers more, connecting the size is not uniform. Mainly divided into several major categories:
(1) 12221-2005 GB/T "metal valve structure length," the general category. At present most domestic ball valve manufacturers are designed and produced according to this standard. But this standard is not perfect, the specification is not complete, the floating ball valve maximum nominal diameter is DN1200, the fixed ball valve nominal diameter DN2000. According to the factory produced by the valve specifications and control of the information, the floating ball valve nominal diameter of the smallest DN6, the nominal diameter of the fixed ball valve DN50. After research, the manufacturers are not uniform size, in order to have a unified standard, the user in the selection and installation of the same specifications can be interchangeable, recommended the National General Machinery Research Institute of 12221-2005 GB/T metal valve structure length was revised. Recommended by the design institute and the user in accordance with the standard selection, ball valve manufacturers in accordance with the standard design and manufacturing.
