HIGH PURITY & HIGH VACUUM
The sealing principle of the HELICOFLEX® family of seals is based upon the plastic deformation of a jacket that has greater ductility than the flange materials. This occurs between the sealing face of a flange and an elastic core composed of a close-wound helical spring. The spring is selected to have a specific compression resistance. During compression, the resulting specific pressure forces the jacket to yield and ensures positive contact with the flange sealing faces. Each coil of the helical spring acts independently and allows the seal to conform to irregularities on the flange surface.
The HELICOFLEX® DELTA uses two small ridges or “Deltas” on the face of the seal. The load required to reach ultra-low Helium leak rates is reduced by concentrating the seal contact area. There is no risk of damage to the sealing surfaces as long as the minimum hardness requirements are maintained.