6、 If slight leakage is found at the packing during use, the valve stem nut can be tightened slightly until the leakage stops. Do not continue tightening.

Function of nonmetallic compensator of fan in pipeline
The non-metallic contraction joint is a very important accessory in the pipeline installation, which can maintain the pipeline from being broken by excessive pressure.
During the construction of thermal pipeline, the bellows compensator shall not be damaged in any way, otherwise it will result in bad results. In this process, it is easy to show different levels of errors, which will make the operating thermal pipeline seriously deviate from the design position, so it will be subject to different levels of bending application in operation, which will affect the normal operation of the bellows compensator, and more serious will lead to the gradual decline of its service life, and may cause the thermal pipeline to fail to operate normally. Sometimes, when pipelines are connected, the eccentricity will become larger, and the pipeline will deviate from the center of the pipe trench; Perhaps due to the effect of the side wall of the pipe trench, the uneven yellow sand cushion or uneven trench bottom when laying the thermal pipeline, the pipeline eccentricity is large.
In recent projects, non-metallic contraction joints are supplied as a whole, and the supplier of non-metallic contraction joints shall be notified to guide installation on site. The non-metallic contraction joint has its own attachment part, namely pillow shaped sealing data. It is covered with a layer of stainless steel mesh on the surface of aluminum silicate refractory fiber felt to ensure that the insulation data will not be taken away under the high temperature and high speed smoke. During construction, one side of the labyrinth seal can be poured first, and then the pillow seal data can be placed to support the mold, and then the wear-resistant data on the other side can be poured until the mold support data is finally taken out. The idea that the formwork supporting data can be burned at high temperature during operation must be resolutely stopped.
The manufacturer of non-metallic contraction joint has metal or non-metallic surface packaging materials on the surface of its skin during shipment, and requests the device unit not to take down these surface packaging materials at random. Because it has a maintenance function on the skin of corrugated contraction joint, the slag from gas cutting and "welding beans" from electric welding during the operation of the device have high temperatures, Once it falls on the skin of non-metallic contraction joint, it will burn the skin and form leakage.
During the operation of the device, the non-metallic contraction joint shall be transported reasonably, and cannot be pried with a crowbar to prevent damage to the skin of the non-metallic contraction joint. When removing the internal and external fixation installation of non-metallic contraction joints after the completion of the device work and before the divisional test run, pay special attention not to damage the non-metallic contraction joints. When cutting the fixed steel plate inside the furnace with a gas cutting gun, it is necessary to cut from the weld of the fixed steel plate, and remove the fixed steel plate by cutting off the weld meat. Because the stainless steel wire mesh is below the fixed steel plate, It is easy to be burned out, so you can't use barbarism to save time. When removing the external fixed installation of non-metallic contraction joint, it is not allowed to use a gas cutting gun to cut it. Because the outer side is a non-metallic skin, it cannot withstand the high temperature of the torch. The external fixed installation is fixed with screw and nut. The nut must be loosened with a wrench, and the screw must be pulled out to make the non-metallic contraction joint in a free state.