What is a pneumatic seal? Pneumatic seal is the use of compressed gas to plug the gap between the rotating shaft, to avoid medium leakage of the sealing device called pneumatic seal. Annular grooves are machined on the pneumatic sealed housing to plug the gap between the rotating shafts by compressed gas to avoid oil leakage. Pneumatic seals are not limited by speed and temperature. It is generally used for rotating secret sealing equipment with small pressure difference, liquid medium seal or gas medium seal, such as to avoid lubricating oil leakage in the bearing room.
The question is: Is the pneumatic seal the same as the hydraulic seal?
The two are different, the pressure level is only very different, the pneumatic pressure is very low, and the sealing requirements are not high. Hydraulic pressure is dozens of times, hundreds of times pneumatic, can not leak.
Secondly, the working conditions of the two are different. (as follows)
1. Air seal room temperature gas pressure of about 4~8kg/kg/cm^2
2. High temperature hydraulic oil pressure of hydraulic seals is about 50~400kg/cm^2
3. Sealing materials are different, hydraulic seal is mainly used to seal liquid, pneumatic seal is mainly used to seal gas, hydraulic seal is generally polyurethane or nitrile rubber, pneumatic seal is generally nitrile rubber.
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