This all-metal seat-sealing system enables the attainment of great sealing forces using relatively slight closing or actuation force. For sealing materials, non-rusting steels are used, which in spite of their great sealing force are only elastically deformed. The VATRING system is suited for an extreme vacuum. In clean operating conditions, it has a long life of 100,000 cycles. It is also bakeable up to 450 °C, in both open and closed position.