Pump Seals vs. Packing: Which One is Better?

In industrial production, the pump is a common equipment for conveying fluid, and Pump Seals are an important part to ensure the normal operation of the pump. The role of Pump Seals is to prevent the medium from leaking from the pump to the outside, or the outside air or impurities entering the pump, which will affect the performance and life of the pump. At present, there are mainly two pump shaft sealing methods on the market, namely Pump Seals and Packing.

Pump Seals is a way of using mechanical principles to achieve sealing. It consists of a static sealing surface and a dynamic sealing surface. The static sealing surface is fixed on the pump body, and the dynamic sealing surface is fixed on the shaft. There is a certain gap between the two. , through the gap to control the leakage of the medium. There are many types of pump seals, such as spring type, rubber bellows type, metal bellows type, etc. Different materials and structures can be selected according to the nature and temperature of the medium.

Packing is a way of using physical principles to achieve sealing. It is composed of a number of soft fibers or wires woven into ropes, filling the annular space between the shaft and the sleeve to form a ring-shaped seal. packing ring. The packing ring achieves the sealing effect through compression, and also needs a certain amount of cooling water or lubricating oil to reduce friction and temperature. There are also many types of fillers, such as asbestos, graphite, polytetrafluoroethylene, etc., and different materials and shapes can be selected according to the nature and temperature of the medium.

So, which one is better, pump sealing or packing? This should be judged according to the specific working conditions and requirements, but we can make a simple comparison from the following aspects:

sealing effect

There are obvious differences in sealing effect between Pump Seals and Packing. Generally speaking, Pump Seals are better than Packing. This is because Pump Seals use the small gap between the static and dynamic sealing surfaces to prevent the leakage of the medium, while the packing uses the compressed packing ring to achieve the sealing effect. Therefore, the leakage of Pump Seals is much smaller, generally between 0.1~1ml/min, while the leakage of Packing is much larger, generally between 10~100ml/min. If the medium is toxic, harmful, flammable, explosive or under special circumstances such as high temperature and high pressure, you should choose Pump Seals to ensure safety and environmental protection.

service life

There is also a significant difference in service life between Pump Seals and Packing. Generally speaking, Pump Seals are better than Packing. This is because Pump Seals have better wear resistance due to smaller gaps and less friction, and generally can be used for 1 to 2 years or even longer. However, due to the large amount of compression and high friction, packing has poor wear resistance, and generally needs to be adjusted or replaced regularly, and its service life is generally about 3 to 6 months. If the medium is corrosive, abrasive or contains particles and other special circumstances, you should choose Pump Seals to prolong the service life.

Operating costs

There is also a significant difference in operating costs between Pump Seals and Packing. Generally speaking, Pump Seals are better than Packing. This is because Pump Seals do not require additional cooling water or lubricating oil due to the small leakage, so the operating cost is relatively low, generally between 0.1 and 1 yuan/hour. However, due to the large amount of leakage, packing needs to consume a certain amount of cooling water or lubricating oil, so the operating cost is relatively high, generally between 1 and 10 yuan/hour. If the medium is high temperature and high pressure, easy to crystallize or deteriorate, etc., you should choose Pump Seals to save operating costs.

Summarize

In summary, we can draw the following conclusions:

- Pump Seals are superior to Packing in terms of sealing effect, service life and operating cost, and are a more advanced, reliable and economical pump shaft sealing method.
- Packing is less expensive to purchase than Pump Seals and is a more economical and simpler way to seal pump shafts.
- According to different working conditions and requirements, you can choose a suitable pump shaft sealing method to achieve the best sealing effect and operating efficiency.