Different types of rubber expansion joints

Single convolution
Complete tied
Double convolution
Triple convolution
Pressure Balanced
Conc - Type
Elbow - Type
EXC - Type



Seiris’ rubber expansion joints are customized according to the following constraints:

  • Temperature up to 200°C
  • Pressure up to 20 Bars
  • Diameter dimensions from 25 to 4000 mm

We manufacture all types of:

  • Circular expansion joints
  • Single convolution, double or triple convolutions, with tie rods, conical, balanced pressure
  • And rectangular expansion joints: Single convolution or double convolutions

Pumped fluid: all kind of (acid or strong bases very agressive when going under dew point) : in order to adapt our products to those various conditions, we use the following rubbers :
Rubber, Neoprene, EPDM, Silicon, Butyl, Chlorobutyl, NITRILE, SBR, HYPALON AND VITON

For flanges we use following steels: S 275JR, S355J2G3, AISI 304, 316, 316L.

Rubber expansion joints are studied, manufactured and tested following international standards : FSA and ASTM.


Design Criteria

Temperature resistance
Resistance to corrosion
Forming capacity
Mechanical characteristics


Main Advantages

  Medium to high pressure resistance
 Low spring rates
  Low maintenance
Large cycle life

Rubber Expansion Joints are designed, manufactured and tested according to Internationally Recognized Codes and Standards :
F.S.A (Fluid Sealing Association)
A wide range of tests can be carried out on customers request
Hydraulic pressure test
Vacuum test
Material analysis
Spring rates
Movement test
Dimensional inspections
Technical assistance for the design of piping systems
On site inspection
Training and seminars
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