How to weld the square expander

 How to weld the square expander
The effect of using new mechanical seal of square expander is better than the old one, but the quality or material of new mechanical seal is not selected properly, and the larger error of matching size will affect the sealing effect; in polymeric and permeable media, square expander is better not to be replaced if there is no excessive wear. Because the square expander in the square expander seat for a long time in a static state, so that the polymer and impurities deposited as one, played a better sealing role.
 
Once the mechanical seal leakage will be eager to dismantle and repair, in fact, sometimes the seal is not damaged, just adjust the working conditions or properly adjust the seal to eliminate leakage. This will avoid waste and can verify their ability to determine the fault, and accumulate maintenance experience to improve the quality of maintenance.
 
For the pipeline in the laying of the choice of corrosion-resistant materials pipeline basic problems will not be very big, but for the valve and the square expander is different, the integrity of the square expander connection for the transport of fluids piping system is critical. Whether conveying chemical media (such as hydrocarbons) pipeline system, or water supply pipeline, square expander connection leakage can cause serious environmental and economic impact, and may even bring huge security risks.
 
If square expanders are not protected and exposed to corrosive environments or contaminated industrial atmospheres, corrosion can occur at a rapid rate. In addition, due to the complex geometry of the square expander connection, the problem of gap corrosion between two square expander faces and galvanic corrosion between different metals can easily occur, both of which can seriously damage the integrity of the pipeline system.