Name: suction port
Dalian marine valve is a device used to control the pressure, flow rate and flow direction of the fluid in the ship pipeline to meet the environmental conditions of the ship. The valve is the control device of the fluid pipeline. Its basic function is to connect or cut off the flow of the medium in the pipeline, change the flow of the medium, change the flow direction of the medium, adjust the pressure and flow of the medium, and protect the normal operation of the equipment in the pipeline.
The common faults of valve body and bonnet are damage, sand hole and aging or corrosion damage. These faults may be caused by the following aspects.
(1) The main reasons for the damage of the valve body and bonnet are the poor design factors such as low safety factor, unreasonable structure and concentration of internal stress; Or due to poor manufacturing quality, such as uneven thickness and uneven material; Or poor welding quality due to too brittle weld and too large internal stress; Or the position is skewed and distorted due to improper installation; Or the valve is not suitable for the working condition due to improper selection; Or because the water hammer pressure is too high; Or due to poor maintenance, the insulation is not good in winter and it is frozen and cracked; Or due to strong external force.
(2) Sand holes are mainly caused by poor manufacturing quality.
(3) The causes of corrosion or aging are mainly due to poor manufacturing quality, or poor corrosion prevention and maintenance, and untimely replacement and maintenance.