Performance Comparison of Internal and External Mechanical Seal Slurry Pumps

---

• TIME : 2025-05-27

There are performance differences between internal and external mechanical seal slurry pumps in multiple aspects. The following is a detailed comparison for you:

Sealing structure characteristics

Interior mounted: The entire seal containing the orchid is immersed in the slurry, and its assembly method is from the impeller end to the motor end.

Exterior mounted: The entire seal is partially immersed in the slurry, and its assembly method is from the motor end to the impeller end. The double end external installation type is a derivative of the single end external installation type (replacing the single end sealing water side skeleton oil seal with a series mechanical seal), with the aim of improving its service life.

face pressure

Interior type: End face pressure ratio p=0.3-0.6MPa. It is necessary to control the pressure ratio of the end face within a reasonable range. If it is too small, it will reduce the sealing performance, and if it is too large, it will accelerate the heating and wear of the seal.

Exterior type: The end face pressure ratio p is 0.15-0.4MPa, and it is also necessary to control the end face pressure ratio reasonably to ensure the sealing effect and avoid excessive wear.

Applicable scenarios

Interior mounted: Suitable for occasions with high sealing requirements and relatively high medium pressure. Due to its sealing structure being more immersed in the medium, it can better resist medium pressure and prevent medium leakage.

Exterior mounted: When the medium contains a large amount of impurities and particles, exterior mounted mechanical seals can reduce the wear of impurities on the seal and extend its service life. In addition, in some situations where installation space is required, the external assembly method may have more advantages.

　　This article originates from https://www.fuyangpumps.com/news/419.html. Please indicate the source when reprinting.

(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)

• Previous: Maintenance Measures for Winter Slurry Pump
• Next: Comparison of Performance Characteristics between Horizontal and Vertical Slurry Pumps