Maintenance methods in low temperature environment are as follows:
1. If it is intended to be placed for a long time, remove the ball valve and drain the liquid in the pipeline.
2. If disassembly is not possible, insulation measures shall be taken at the bottom of eccentric hemisphere valve.
3. If conditions permit, antifreeze can be added to the liquid in the pipeline.
4. If there is no suitable warm keeping condition, the eccentric hemisphere valve shall be cleaned, a little lubricating oil can be applied, and the opening and closing parts of the ball valve shall be coated with antifreeze oil.
