The use of expansion joint and butterfly valve

The expansion joint is mainly composed of a body, a telescopic sleeve, a gland, a sealing ring and a bolt. The expansion body, telescopic sleeve and gland are made of 16MnR, and the sealing ring is sealed with nitrile rubber, which has good water tightness and air tightness. The fasteners are made of nickel-based stainless steel, which is resistant to wear and corrosion and has a long service life.

The length of the structure of the expansion joint is the minimum length at the factory, the sealing cap bolt is tight, the installation length should be pulled to the installation length, and the gland bolt should be tightened in time after installation; The joint is adjusted to the required length, but must not exceed the amount of expansion and contraction.

If it is used to compensate the displacement caused by the temperature difference of the pipeline, it must be adjusted to the installation length at normal temperature during installation; the expansion joint can be installed at any position of the pipeline, but it should be located behind the valve when connecting the valve; longer or heavier pipeline It is necessary to set the movable support near the retractor to ensure the operation of the expansion joint is normal; after installation, the telescopic clamp bolt should be tightened in time, pay attention to the degree of tightness, and adjust according to the working pressure of the pipeline. Too tight or too loose will affect the sealing effect and Flexibility, flexibility, and at the same time, the limit bolts should be fixed in time to prevent pull-out during use.

The expansion joint and butterfly valve are used together to compensate the position and angle error of the pipeline flange by the axial expansion and radial angular displacement between the two flange faces, and eliminate the internal stress caused by the pipeline temperature difference. The installation and maintenance of the pipeline brings great convenience.