초록 ▼

A method of sealing a pressure vessel so that pressurized gas in the vessel is released if the temperature of the gas approaches a critical temperature. An end plate having a concave upper surface and a convex lower surface, is provided with a bore perforating the plate at a low point of the concave

A method of sealing a pressure vessel so that pressurized gas in the vessel is released if the temperature of the gas approaches a critical temperature. An end plate having a concave upper surface and a convex lower surface, is provided with a bore perforating the plate at a low point of the concave surface. A central portion of the plate surrounding the bore bending downwardly to the bore so as to define a cavity in the plate. The plate is oriented with the concave surface facing in an upward direction. An alloy pellet, having a melting point which is lower than the critical temperature, is provided onto the concave surface so that the pellet is gravitationally drawn to rest in the cavity. The end plate is then heated at a temperature higher that the melting point of the pellet so that the pellet is melted and plugs the bore. The end plate is then cooled to solidify the melted pellet in the cavity and in the bore. An open end of the vessel is then fitted with the end plate so as to seal the end closed, and the vessel is supplied with pressurized gas.

대표청구항 ▼

A method for manufacturing a safety valve of a sealed vessel for releasing pressurized gas from the sealed vessel in an abnormally heated state being defined by a critical temperature, comprising the step of: bending a bottom plate into a partial sphere or into a cone, with a concave surface and a c

A method for manufacturing a safety valve of a sealed vessel for releasing pressurized gas from the sealed vessel in an abnormally heated state being defined by a critical temperature, comprising the step of: bending a bottom plate into a partial sphere or into a cone, with a concave surface and a convex surface, shaping a cavity of a partial sphere or of a cone by bending a central portion of the bottom plate in a direction from the concave surface toward the convex surface, perforating the bottom plate to provide a bore at a central portion of the cavity, holding the bottom plate with the convace surface facing upward, supplying onto the concave surface a pellet of an alloy with a melting point lower than the critical temperature of the abnormally heated state, heating the bottom plate for a certain time at a temperature higher than the melting point of the alloy, melting the pellet into a melt for plugging the bore of the cavity, cooling the bottom plate for freezing the melt in the cavity and the bore, fitting the bottom plate to an open end of the vessel to be sealed and supplying the vessel with pressurized gas.