Hot runner manifold for injection molding machine

In a hot runner for pressure molding having a floating manifold disposed between at least two spaced abutments, said manifold having a plurality of conduits communicating with and contacting mating nozzles set in one of said abutments, means for sealing the manifold relative to said nozzles comprising:

• a first thermal expansion support element integral with each nozzle disposed between the manifold and said one abutment, said element being spaced from said abutment and in contacting relationship with said manifold, a second thermal expansion support element between the manifold and the other of said spaced abutments in contacting relationship with said manifold, whereby heat generated in operation of said manifold is conducted to the nozzle and to the first thermal expansion support element causing the element to expand into contact with said one abutment to clamp and seal the nozzle tightly between said abutments and to establish full compressive support between said nozzle, abutments and manifold, wherein at least one of said first and second thermal expansion support elements is formed with a peripheral undercut defining a cross-section exhibiting spring-like characteristics.