There are many reasons why fluorine lined valves cannot be opened, often related to the characteristics of the medium, valve status, component wear, or operating mode.
1. Crystallization of the medium/blockage of impurities in the valve chamber
If the valve is conveying a medium that is prone to crystallization (such as certain chemical solutions or high concentration fluids), the medium may crystallize and solidify in the gaps between the valve chamber, valve core, and fluorine lining after shutdown; Or solid impurities (such as particles and residues) mixed into the medium may accumulate and get stuck between the valve core and valve seat for a long time, directly hindering the lifting or rotation of the valve core, resulting in the valve being unable to open normally.
2. Adhesion between valve core and fluorine lining layer
The valve core of the fluorine lined valve is isolated from the inner wall of the valve body by a fluorine lined layer. If the valve is left unused for a long time, the valve core and the fluorine lined layer may have slight adhesion due to long-term contact, changes in environmental temperature and humidity, or residual media; It is also possible that the valve core was pressed too tightly when it was closed before, and the fluorine lining layer was slightly deformed and adhered too firmly to the valve core, resulting in a “stuck” phenomenon when it is opened again.
3. The core components of the valve are damaged or stuck
Internal key component failures of valves can also lead to failure to open, such as valve stem wear and corrosion due to long-term use (although lined with fluorine to prevent corrosion, the exposed part or seal of the valve stem may be damaged), resulting in jamming; Or damage to operating components such as handwheels and gearboxes (such as slipping handwheels or misaligned gears), resulting in the inability to transmit operating force to the valve core; It is also possible that the valve stem nut is worn and unable to drive the valve stem to rise and fall normally.
4. Improper operation method
If the valve is not operated in the specified direction (such as clockwise closing, counterclockwise opening in reverse), or if the valve is stuck due to long-term non opening, only conventional force operation cannot overcome the resistance; It is also possible that the fluorine lined valve with a driving device (such as electric or pneumatic) did not start the driving system correctly (such as the electric valve not being powered or the pneumatic valve having insufficient air pressure), resulting in the valve being unable to respond to the opening command.