Performance parameters of mechanical seal-

Performance parameters of mechanical seal

　2017-07-17　　

Performance parameters of mechanical seals:

The performance parameters of mechanical seals mainly include value, friction coefficient, wear volume, leakage volume, power consumption (friction power consumption) and cooling flushing volume.

PV value-The seal pair of mechanical seal is similar to the friction pair of bearing, and the value is used as an important parameter for selecting, using, testing and designing mechanical seal. The frictional power consumption, wear, temperature rise and working conditions of mechanical seals are all related to it.

Use PsV value Use PsV value

Use PsV value: Use PsV value is the product of the sealing medium (or system) pressure Ps and the average peripheral speed V of the sealing end surface, indicating the use conditions, working conditions and working difficulty of the mechanical seal. It is sometimes used to illustrate the development level of sealing technology, for example, the highest technical level of mechanical seals has reached PsVu003d1000MPa·m/s. It can also be used for selection and material matching.

Working PgV and PeV

The working PgV value and PeV value are the product of the specific load of the seal end face and the contact specific pressure and the average peripheral velocity v of the seal end face, indicating the total load per unit area of u200bu200bthe seal pair and the carrying capacity of the asperity when the mechanical seal works.

Allowed [PsV], [PeV] and [PgV] values u200bu200bin design

According to a certain friction pair material pairing, [PsV], [PeV] and [PgV] are determined under the specified service life and allowable wear speed. Due to the different sealing media, working conditions and material matching, the design allowances [PsV], [PeV] and [PgV] can only be determined based on test results and use experience.

Table 1-9 shows the allowable [PsV] values u200bu200bfor some scouring pairs.

Table 1-9 Permissible combinations of certain friction pair materials [PsV]

Table 1-10 shows some commonly used sealing materials and their allowable [PeV] values.

Table 1-10 Some commonly used sealing materials and their allowable [PeV] value

Table 1-11 shows the approximate dry running limits of different sealing surface material combinations for mechanical seals.

Table 1-11 Approximate [PsV] limits for dry running of different sealing surface material combinations for mechanical seals

The limit (PeV) max value is based on the PeV value when thermal cracking failure occurs as the limit value. This is to avoid thermal cracking of the seal pair and limit the working PeV value to be less than the limit value.

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The contact specific pressure of the end face of the mechanical seal is the friction coefficient of the mechanical seal