As an important control element in pipeline system, large diameter butterfly valve is widely used in water conservancy, electric power, petrochemical and other fields. However, in the process of use, the problem of butterfly valve sticking often troubles the user, affecting the normal operation of the system. Large-caliber butterfly valve manufacturers and everyone together to take a look at the causes and solutions of large-caliber butterfly valve jam.
First, the reason for the large diameter butterfly valve sticking
There are various reasons for large diameter butterfly valve sticking, mainly including:
Impurities blockage: impurities such as welding slag, rust, residue in the pipeline enter the valve, blocking the throttle and guiding parts, resulting in the valve can not open and close normally.
Insufficient lubrication: Valve bearings, stem and other parts lack lubrication, increasing friction, resulting in difficult valve operation.
Parts damage: stem bending, deformation or wear, bearing, sealing ring and other parts damage, will affect the normal operation of the valve.
Improper installation: excessive pipeline stress, plate offset and other reasons, will also lead to the valve jam.
Second, the solution
For different reasons caused by the problem of sticking, the following solutions can be adopted:
1. Clean up impurities
Internal cleaning: Remove the valve, clean the internal impurities, grind the damaged sealing surface, and flush the pipeline.
External flushing: flushing gas or steam externally at the bottom plug of the valve to wash the valve.
Install filter: Install filter in front of the valve pipe to prevent impurities from entering the valve.
2. Lubrication and maintenance
Regular lubrication: Use suitable lubricating oil or grease to lubricate valve bearings, stem and other components.
Clean sealing surface and valve stem: regularly clean the sealing surface of the butterfly plate and valve seat and the valve stem on the dirt, rust, etc.
3. Adjustment and repair
Adjust plate position: Adjust the plate position to align it with the seat.
Repair or replace damaged parts: Timely replacement of bent, deformed or worn stem, bearing, sealing ring and other parts.
Optimize the sealing structure: Select the appropriate sealing structure and material according to the working condition to reduce friction and extrusion pressure.
4. Other measures
Eliminate pipeline stress: reasonably design and install pipeline support hangers to release pipeline stress.
Adjust the medium parameters: Select the appropriate valve type and material according to the medium pressure and temperature, and filter or precipitate the medium.
Third, the prevention of large diameter butterfly valve sticking suggestions
Select reliable quality of large diameter butterfly valve products, and strictly in accordance with the instructions for installation and use.
Regular maintenance of the valve, timely cleaning of impurities and lubrication parts.
Strengthen the management of the pipeline system to prevent impurities from entering the pipeline.
