In recent years, with the developmentof technology,mechanical seal technologyhas also beendramatically improved.Mechanical sealdesign approachcan beclassified asnon-propelledandpush,pushO-ringtype mechanicalseals,mechanicalseals, etc.wedge ring,non-propelledbellows-typemechanical seals, bellowstype mechanicalsealshavemetalbellows mechanicalseals,PTFE bellowsmechanical seals, rubberbellows mechanical seal, and so on.