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Inspection and repair of the shaft seal in screw-type refrigeration compressors, maintenance of York compressors: 1. Inspect the shaft seal. Check whether the friction surfaces of the moving ring and stationary ring of the shaft seal are worn or abraded, and also examine whether the rubber sealing ring is aged or whether the spring force of the retaining ring or small spring is insufficient. 2. Shaft seal repair. The repair of the moving ring and the stationary ring is mainly carried out by grinding with abrasive sand, and the grinding methods and requirements are the same as those for pistons. If the rubber ring ages, it should be replaced; if the spring lacks sufficient elasticity, the method of comparing the free height on a glass plate using both a new and an old spring can be used to determine whether replacement is necessary. 3. Inspection of the oil piston in screw-type refrigeration compressors. Check whether the rubber seal of the oil piston meets the requirements; if it has aged, it should be replaced with a new one. Use an inner diameter gauge to check for wear on the inner diameter of the cylinder; if it exceeds the limit value, a new part should be replaced. 4. Inspection of the balance piston and balance cylinder liner of the screw-type refrigeration compressor. The inspection and measurement of the balance piston can be carried out using an outer diameter micrometer. The wear of the balance cylinder can be measured using an inner diameter gauge; if the wear on both sides exceeds the specified limit, it should be replaced with a new component. But as long as there is no lack of lubricant, the amount of wear is very small. 5. Inspection and maintenance of the check valve in screw refrigeration compressors. The suction and exhaust check valves installed on the unit should be regularly inspected for their packing seals, springs, screws, etc.; any damaged or worn-out seals should be replaced with new ones. 6. For screw-type refrigeration compressors, check the energy indicator assembly. If the spring’s elasticity is insufficient, the spring can be replaced; if there are burrs on the pointer sensor, they can be polished with fine sandpaper, and so on. Inspection and repair of shaft seals for screw-type refrigeration compressors, maintenance of York compressors. Inspection and repair of shaft seals for screw-type refrigeration compressors, maintenance of York compressors. York industrial refrigeration units are widely used in applications such as natural gas dehydration, polypropylene production processes, VCM production processes, low-temperature methanol washing processes, acrylonitrile production, fluorine chemical industries, pharmaceutical manufacturing processes, and chlorine liquefaction. Inspection and repair of shaft seals for screw-type refrigeration compressors, York compressor maintenance