Product Description: packing (packing preparation) (packing), also known as packing, usually woven from strands made of softer, usually square or rectangular cross-sectional area is circular strips filled in the sealed chamber, in order to achieve sealing. Packing cotton and other fibers are first plug the leak in the flow channel to prevent leakage, mainly used for water mechanical shaft seal. Due to the wide filler sources, processing is easy, inexpensive, reliable sealing, simple operation, so still in use. Rotary is now widely used in packing centrifugal pumps, compressors, vacuum pumps, mixers and ship propeller shaft seals, piston pumps, reciprocating compressors, reciprocating chiller seal, and a variety of valve stem seals move .