What are the Blind Types for Piping Industry

The Blind Types for Piping Industry including General Blinds, Paddle Blinds, Spectacle Blind and Line Blind Valves.

General Blinds is a single flange shape without holes. Paddle Blinds is an upgraded version of a regular blind with an additional fixture. Spectacle Blind is usually used in the pipe diameter of the pipeline, usually with a flange at one end of the occupation of the spacing to keep the pipeline open, when needed to change to the other end of the same thickness of the blind in order to cut off the pipeline. Avoid the temporary replacement of other blind plate caused by the pipeline is forced to expand, affecting the whole system. Commonly used standards SHT 3425 petrochemical steel pipeline blind; HGT 21547 pipeline steel inserts, pad ring, 8 word blind series; ASME B16.48 pipeline blind.

Blind valve is the upgraded equipment of blind plate, which can be operated by one person with convenient and quick effect. Blind valve is a kind of hand, electric or gas, hydraulic cut off gas medium gate valve, generally divided into electric blind valve, hydraulic blind valve, pneumatic blind valve, closed plug valve, electric open type blind valve. Blind valve has three driving devices, including two manual clamping or loosening device, a motorized device to make the gate open or close, in the open or close the gate, first loosen the two manual devices, and then start the motorized device, in order to achieve the purpose of the gate open or close, the gate open or close the completion of the gate, and then the two manual devices clamping, the pipeline can be worked. Mainly by the left valve body, right valve body, valve plate, sealing ring, screw nut drive mechanism and clamping mechanism and other parts. The valve body is usually made of cast steel or stainless steel and other high-strength materials, and the valve plate is made of high-quality steel, such as carbon steel or stainless steel, and after special treatment to enhance the hardness and wear resistance. Seal ring commonly used rubber or polytetrafluoroethylene (PTFE), the former is suitable for low-pressure, room temperature piping system, the latter is suitable for high temperature, high pressure or corrosive conditions.

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