Packing glands: varieties and application features

Packing glands are products that are intended for stuffing boxes. The material is an elastic cord that has a square or circular cross section. The product is made from an asbestos thread or other raw material. Thanks to the material presented, it is possible to ensure tightness of the moving and stationary connections of the mechanisms. Cords well tolerate the influence of an aggressive environment and are resistant to temperature changes. According to the material of the manufacture of the product can be divided into asbestos and not asbestos.

Packing glands should seal the nodes well in any technical units. They can be divided into many types and classes. Each of them has a certain level and lifetime. For example, asbestos products can be used in equipment that processes oil, and also interacts with chemicals. A complex packing process is carried out using special presses.

Some of the presented products may contain graphite fibers, which are impregnated with polytetrafluoroethylene, and also reinforced with a cotton thread. These stuffing boxes are used to seal plunger and centrifugal pumps. They are good at preventing water leakage. And the presented products are able to control the heat dissipation in pumps, and also reduce their energy consumption. The fact is that they have a low coefficient of friction. The advantage of graphite products is that they are very resistant to high temperatures (about 550 degrees ), Chemical effects. However, the material should not be exposed to moisture, since it can promote corrosion of the metal in the mechanisms.

Graphite gland packing can be self-lubricated. Use these products to consolidate the places where all moving mechanisms will fall. Often, the padding process is required in the communal economy during breakdowns of water pipes or heating systems. Thanks to the cords it is possible not only to stop the leak, but also to prevent its further appearance.

If you use stuffing box stuffing for centrifugal pumps, then it's best to choose a cotton cord. Preliminary product should be soaked in cylinder oil, in which there will be a small amount of paraffin. The advantage of this material is that it can withstand pressures up to 20 mPa and performs well its functions in a fairly wide temperature range (-40 to +100 degrees). However, products are quickly destroyed by alkali and acids.

An interesting option is polymeric stuffing box seals, which are made on the basis of fluoroplastic. They can be made in the form of rings, shavings or cuffs. This material has a small elasticity, so in addition to it, rubber pads should be used. In addition to the presented varieties of packings, there are also those in which copper wire is used .