When abnormal valve operation（globe valve operation） occurs, a certain amount of cleaning fluid can be injected and the above faults can be eliminated after soaking. When dealing with valve stem leakage, should control the tightness of pressure screw, too tight may affect the valve switch difficulty, too loose will affect the tightness; If the grease is contaminated by water, the gear box should be disassembled to remove the contaminated grease and replace it with a new one. Low temperature grease (such as ethanol-based grease) can be used in low temperature season to reduce the generation of freezing blockage.
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