We are often asked why seals are needed on our stainless steel sintered filter elements. Because the 5-layer filter elements are sintered together then it forms a rigid structure and unlike the disposable filter elements they cannot be sealed by axial compression.
The seals are available in a number of types and details can be found in the data sheet here. The most common types are a flat Viton seals and machined PTFE seals.
High Temperature and PTFE Seals:
These seal types are machined form a solid bar stock into a L-shape section and locate on the ends of the filter element to help keep them in position as the filter element is installed.
Flat Seals ®C Viton, EPDM and Nitrile:
These flat seals must be located onto the filter housing head insert and element retainer as the filter element is installed. A little care must be taken to ensure the seal is in right position and it covers the end of the filter element. Then the element retainer is screwed onto the tie rod and the seals are compressed to form a seal.