Solutions to inflexible and stuck gate valve stem

The valve stem of a gate valve is not flexible or stuck, which may cause the valve to malfunction and affect the normal operation of the pipeline system. Here are some solutions summarized based on the provided search results:

1. Remove dirt and repair valve stems

If material deposits between the valve stem and valve seat, or if the valve stem rusts or bends, it may cause the valve stem to become inflexible or stuck. In this case, the dirt should be removed, and the valve stem should be repaired or replaced

2Adjust filler

Pressing the packing too tightly may cause the valve stem to rotate flexibly or get stuck. Loosen the fixing screws of the packing appropriately, add materials according to the specifications, and ensure that the packing is not too tight

3. . Replace or adjust the stem and bushing

If the gap between the valve stem and bushing is insufficient, or the material selection of the valve stem and bushing is improper, it may also cause the valve stem to be stuck. At this time, it is necessary to control the gap between the valve stem and the bushing within the standard range, and the surface roughness of the thread within the standard range. If corrosion or rust is inevitable, the valve stem and nut should be replaced in time

4. Check and maintain lubrication

Lack of lubrication or lubricant failure is also one of the reasons for inflexibility of the valve stem. The lubrication should be checked frequently to maintain a normal lubrication condition

5. Correct operation and maintenance

Excessive operation may cause thread damage, which may cause stem to get stuck. Avoid using too much force during operation, do not use force when closed, and do not reach the upper dead point when opened.