Valve packing is an important part to improve sealing performance. If the packing fails, it will cause leakage and the valve function will fail. Especially when the fluid temperature inside the pipeline is high and corrosive, it will accelerate the aging of the packing, shorten the service life, and affect the function of the valve. So maintaining the packing can improve efficiency. In order to ensure the elasticity of the packing, static pressure testing is used as the standard when the valve leaves the factory. In the process of application, if leakage occurs, the nuts on both sides of the packing gland can be tightened to ensure no leakage. Do not tighten it all at once to prevent the filler from losing its elastic function. In some valve packing, molybdenum disulfide lubricating paste may be installed. As the valve is used, lubricating grease should be added regularly to ensure sealing function