PTFE Lining centrifugal pump: single end face to face mechanical seal VS double end face to face mechanical seal, which is better?

In industrial production, the pump is an important equipment, it is responsible for transporting all kinds of liquid media. Among them, PTFE lining centrifugal pumps, with its excellent corrosion resistance, are widely used in various chemical, pharmaceutical, electroplating and other process fields. The correct selection and maintenance of the mechanical seal of the tetrafluorocentrifugal pump not only helps to improve the operation efficiency of the pump, but also ensures that the liquid medium does not leak and ensures the safety and environmental protection of the production process. In order to better help you understand the mechanical seal of PTFE lining centrifugal pump, this paper describes the difference between its single face to face and double face to face mechanical seal, hoping to be helpful to you.

1. Single end face to face mechanical seal

A single-end face to face mechanical seal, as the name suggests, is a sealing structure with only one set of sealing components. In the process of use, it mainly relies on the friction and wear between the seal end faces to achieve the seal inside and outside the pump. Its basic components include fixed ring, rotating ring, spring, thrust ring, etc., which play the sealing function together through the combination of different materials and processing technology.

The single-end face to face mechanical seal has the advantages of simple structure, low manufacturing cost and convenient maintenance. It is mainly suitable for conveying liquid media with low temperature, small viscosity and weak corrosion, such as water, bromine water, food and so on.

However, because the single-end face to face mechanical seal is easy to produce friction and wear during use, resulting in a gradual reduction in sealing performance, its life is relatively short. In addition, the sealing effect of the single end face to face mechanical seal is greatly affected by the change of the working condition of the pump, and when the leakage occurs, the leaking liquid will directly enter the environment, causing pollution.

2. Double end face to face mechanical seal

Compared with the single-end face to face mechanical seal, the double-end face to face mechanical seal has two sets of sealing components, which are located at both ends of the pump shaft to form two sealing barriers. Even in the liquid medium high pressure, high temperature, high corrosive environment, the double end face to face mechanical seal can also ensure the good sealing performance of the pump. And in the event of leakage, the leaking liquid will enter the secondary sealing chamber of the pump, and will not directly pollute the outside environment.

Although the double-end face to face mechanical seal has complex structure and high manufacturing cost, it has long service life and more stable sealing performance. It is widely used in conveying high temperature, viscosity, corrosive liquid media, such as acid, alkali, organic solvents and so on.

It should be noted that during the use of double-end face to face mechanical seals, attention should be paid to checking and maintaining the sealing performance of the secondary sealing chamber. In addition, it is necessary to regularly check the pressure, flow, temperature and other parameters of the sealing fluid to ensure the efficient operation of the double-end face to face mechanical seal.

Through the above analysis, we can make it clear that the application of single end ace to face mechanical seal and double end face to face mechanical seal in PTFE centrifugal pump has its own advantages and disadvantages. When choosing the mechanical seal of the tetrafluorocentrifugal pump, it is necessary to combine the specific process conditions, fully weigh the various factors, and choose the appropriate type of seal. At the same time, regular inspection, maintenance and replacement of the sealing parts to ensure the stable and efficient operation of the PTFE centrifugal pump.