The sealing ring always remains in contact with the inner walls of the shot sleeve thanks to a self-compensation mechanism: the greater the wear of the ring, the more aluminum can flow and solidify under it, adapting the outer diameter of the ring to the diameter of the shot sleeve.
Thanks to the high pressure injection, the alloy flows under the sealing ring through the holes (or channels) on the plunger tip head, pushing the ring against the internal walls of the shot sleeve and ensuring a costant vacuum seal.
The continuous flow of alloy allows the sealing ring to slightly expand and continuously adapt to the internal diameter of the shot sleeve, compensating any ovalization and deformations of the shot sleeve.
