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How To Clarify Mechanical Seals
Sep 30, 2018

How we judge the type of mechanical seal?


This article we introduce the kind of classification by mechanical seal  working parameters.Mechanical seals are classified according to different operating parameters as shown in below table In this way,you will easily know which type of mechanical seal you need, we could also use those parameters to help you select the right mechanical seal for your exact application:

Mechanical seal classification.jpgJohncrane mechanical seal.jpg


Mechanical seal chamfer 

temperature 

t>150℃High temperature mechanical seal
80<t≤150℃Medium mechanical seal
-20≤t≤80℃Ordinary Mechanical seal
t<-20℃Low temperature mechanical seal

Mechanical seal 

chamfer pressure

p>15MPaSuper high pressure mechanical seal
3<p≤15MPaHigh pressure mechanical seal
1<p≤3MPaMedium pressure mechanical seal
Atmospheric pressure≤p≤1MPaLow pressure mechanical seal
Negative pressureVacuum mechanical seal

Speed of mechanical seal 

rotating face

υ>100m/sSuper high speed mechanical seal
25≤υ≤100m/sHigh speed mechanical seal
υ<25m/sOrdinary speed mechanical seal
Mechanical seal shaftd>120mmBig shaft mechanical seal
25≤d≤120mmOrdinary shaft mechanical seal
d<25mmSmall shaft mechanical seal


Working Parameter

Reach all below requirements



Heavy mechanical seal

p>3MPa;
t<-20℃ or t>150℃
υ≥25m/s;d>120mm
Reach all below requirements



Light mechanical seal

p<0.5MPa;0<t<80℃;
υ<10m/s;d≤40mm
OthersMedium mechanical seal


Working medio

Strong acid, strong alkali and other strong corrosive mediaStrong corrosion resistant medium mechanical seal
Oil, water, organic solvents and other weakly corrosive mediaOil, water and other weakly corrosive media mechanical seal
Abrasive mediumAbrasive medium mechanical seal