What is the technical requirement of the flange?
The flange connection should be kept in the same axis, the screw hole deviation is usually not more than 5% of the aperture, and the bolt is guaranteed to be free. The cover of the flange must be smooth, not in the direction of the radial groove and the sand eye. Flange gaskets should meet the standard and do not allow the use of slant gaskets or double-ply gaskets. When using the soft gasket, the peripheral should be neat and the gasket size should be in line with the cover of the flange. The inner diameter of the gasket should not be smaller than the diameter of the diameter of the diameter of the flange. When large diameter gaskets need to be spliced, they should be used in the form of oblique or maze, not to be flat. When installing, it can be coated with molybdenum grease, graphite oil or graphite powder according to the need, for the sealing of flange and the replacement of gasket.
The technical requirements of the flange are: The flanges on the pipe are commonly used only for connecting valve parts, gauges and equipment with flanged flanges. In addition to the removable parts for repair, the flange connection should be minimized. Excessive use of flanges will increase the potential for leakage and reduce the elasticity of the pipe. The flange face is perpendicular to the center line of the pipe, and its non-vertical degrees can be inspected by flanged or straight square. The flange connection should be parallel, the deviation is not greater than 1.5% of flange diameter, and not greater than 2mm. The deflection should not be eliminated by means of strong bolt.
The mechanical manual has a chapter on the design narrative of various types of flanking: different materials, different pressure levels, different USES. There are also downloadable manuals on the Internet, which can be downloaded for years, not once and for all.
Flange connection shall be chosen according to the nature, temperature and pressure of the medium. It is not allowed to use low pressure flanges on high pressure, or high pressure flanges for low pressure. The former is prone to accidents in production, which cause waste. Different specifications, flanges of different materials can not be used by teams. 10. The flange bolts connection should be chosen according to the provisions of the material, specification, low pressure can not be used in high pressure and normal temperature is used in high temperature, the specification should be consistent, installed in the same direction, connect the bolt the nut should be placed on the body side of the valve. The fastening bolt should be symmetric and even, the tightening is moderate, the length of the outer dew is not greater than twice the pitch. The diameter of the general bolt is 2 ~ 3mm. After the bolt is fastened, it should be close to the flange and not have a wedge. No more than one should be added. Flange does not allow direct burial. A well should be set up for the buried pipe flange connection. Flanges are not allowed to be installed in floor boards, walls and tubes for easy packing, and the flange and bracket should be no less than 200mm.
