Abstract: A method for operating a hardening furnace with hydrogen cooling, including filling the interior of the furnace with workpieces, sealing the interior of the furnace and evacuating it, filling the interior of the furnace with an inert gas, convective heating the workpieces with circulation of the inert gas, evacuating the interior of the furnace, further heating the workpieces by radiant heating and maintaining a theoretical temperature, switching off the heating, filling the interior of the furnace with hydrogen under high pressure, and circulating the hydrogen for cooling the workpieces, evacuating the interior of the furnace and filling it with an inert gas up to approximately atmospheric pressure, and opening the furnace and unloading the workpieces.

Abstract: A sealing system for quick-closing doors of pressure vessels, either by providing under pressure from both sides of a gasket, or by using overpressure between two special gaskets.