Thermic-welded tight bellows
Thermic-welded tight bellows
They are used when leak-tight protection of the components (i.e. screws, shafts, etc.) is necessary against the contamination made by coolants.
They have good chemical and heat resistance according to the properties of the materials used. Thermic-welded tight bellows are available in various shapes and dimensions.
Small tooling costs for new moulds should be considered, if not already available in stock.
Data
Type A fixing schemes
Bellows with type A fastening system have a collar and a flange
Bellows data:
Ø ext. (OD) = Round bellow outer diameter
Ø int. c. = Internal collar diameter
Ø int. (ID) = Internal bellow diameter
Ø int.f. = Internal flange diameter
Ø int. hole = Flange hole centre-to-centre diameter
Ø ext. f = Flange outer diameter
P.A. = Open length
P.C. = Closed length
Stroke = P.A. – P.C.
AP = Opening of 1 fold
X = Fold height
Type B fixing schemes
Bellows with type B fastening system have two collars
Bellows data:
Ø ext. (OD) = Round bellow outer diameter
Ø int. c. = Internal collar diameter
Ø int. (ID) = Bellow internal diameter
P.A. = Open length
P.C. = Closed length
Stroke = P.A. – P.C.
AP = Opening of 1 fold
X = Fold height
Type C fixing schemes
Bellows with the type C fastening system have two flanges
Bellows data:
Ø Ext. (OD) = Round bellow outer diameter
Ø Int. (ID) = Bellow internal diameter
Ø Int. f. = Internal flange diameter
Ø int. hole = Internal flange diameter
Ø Ext. f = External flange diameter
P.A. = Open length
P.C. = Closed length
Stroke = P.A. – P.C.
AP = Opening of 1 fold
X = Fold height
Standard materials
Materials available
The fabric material list is currently being updated for the 2027 edition.
Contact info@pei.it to request the updated version.
Formula
Formula
Formula for calculating closed length