Multi-lobed design
  • Multi-lobed design

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Gamintojas: STACEM

Multi-lobed design

Multi-lobed design provides more sealing surfaces than standard O-rings, offering significant advantages over standard O-rings, making them the choice for any application where you want to achieve a better, high performing seal.



Advantages

  • With multiple seal points, less squeeze is required to provide an effective seal. This means less friction and wear which will increase seal life and lower maintenance costs.
  • The square cross sections resist distortion called “spiral twist” that may be encountered when using O-rings.
  • Unlike an O-ring, where the parting line is found on the only sealing surface, the parting lines of X-ring compression seals are located in the center of the cross section away from the primary sealing surfaces.
  • Better lubricant retention – The grooves on the inside and outside diameter of these rings retain lubricant thereby lowering friction and extending packing life.


Sealing effect

The Quad-ring is used primarily for dynamic sealing. Its field of application is limited by the respective pressure and speed. Quad-rings are self-sealing, double-acting sealing elements.



Assembly information

The recommended installation spaces are calculated according to the criteria of the standard AS568A. The expansion, deformation and reduction settings of the cross section and swelling are similar to those of the Orings. Compared to the method of assembly of O-rings, the assembly of the Quad-ring in a trapezoidal groove is not possible.

Quad-ring installation recommendation as rotary seal
For applications with short activity cycles, the Quad-ring can be used for sealing rotating shafts. It should be noted that the internal Quad-ring diameter selected should be approx. 2% - 5% greater than of that of the shaft requiring sealing. This is due to the fact that a stretched elastomer ring has been found to shrink under applied heat. This increases friction and wear, leading to a substantial reduction in service life. Under 0.5 m/s circumferential velocity, this proviso can however be neglected.

These installation recommendations are only indications and are intended as approximate guidelines. Users are advised to perform tests validating the installation.



Speed (m/s)

  • Reciprocal movement ≤ 0.5
  • Rotary movement ≤ 2


Fields of application

Pressure ranges* Radial, axial static Radial dynamic Rotary dynamic
without back-up ring 10 Mpa (100 bar) 5 Mpa (50 bar) 2,5 Mpa (25 bar)
with back-up ring 40 Mpa (400 bar) 30 Mpa (300 bar) 15 Mpa (150 bar)
Speed 0,5m/s 2m/s (limited service)

(*) take the allowed tolerances and the gap dimensions into account

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Multi-lobed design provides more sealing surfaces than standard O-rings, offering significant advantages over standard O-rings, making them the choice for any application where you want to achieve a better, high performing seal.



Advantages

  • With multiple seal points, less squeeze is required to provide an effective seal. This means less friction and wear which will increase seal life and lower maintenance costs.
  • The square cross sections resist distortion called “spiral twist” that may be encountered when using O-rings.
  • Unlike an O-ring, where the parting line is found on the only sealing surface, the parting lines of X-ring compression seals are located in the center of the cross section away from the primary sealing surfaces.
  • Better lubricant retention – The grooves on the inside and outside diameter of these rings retain lubricant thereby lowering friction and extending packing life.


Sealing effect

The Quad-ring is used primarily for dynamic sealing. Its field of application is limited by the respective pressure and speed. Quad-rings are self-sealing, double-acting sealing elements.



Assembly information

The recommended installation spaces are calculated according to the criteria of the standard AS568A. The expansion, deformation and reduction settings of the cross section and swelling are similar to those of the Orings. Compared to the method of assembly of O-rings, the assembly of the Quad-ring in a trapezoidal groove is not possible.

Quad-ring installation recommendation as rotary seal
For applications with short activity cycles, the Quad-ring can be used for sealing rotating shafts. It should be noted that the internal Quad-ring diameter selected should be approx. 2% - 5% greater than of that of the shaft requiring sealing. This is due to the fact that a stretched elastomer ring has been found to shrink under applied heat. This increases friction and wear, leading to a substantial reduction in service life. Under 0.5 m/s circumferential velocity, this proviso can however be neglected.

These installation recommendations are only indications and are intended as approximate guidelines. Users are advised to perform tests validating the installation.



Speed (m/s)

  • Reciprocal movement ≤ 0.5
  • Rotary movement ≤ 2


Fields of application

Pressure ranges* Radial, axial static Radial dynamic Rotary dynamic
without back-up ring 10 Mpa (100 bar) 5 Mpa (50 bar) 2,5 Mpa (25 bar)
with back-up ring 40 Mpa (400 bar) 30 Mpa (300 bar) 15 Mpa (150 bar)
Speed 0,5m/s 2m/s (limited service)

(*) take the allowed tolerances and the gap dimensions into account

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