Double layered cooking apparatus

A cooking apparatus comprising:

• an outer shell having an opening;
• an inner shell disposed inside the outer shell through the opening, forming a cavity between the outer and inner shells, wherein the cavity partially contains a heat conductive medium, the outer and inner shells are joined near the opening to form a container;
• and
• a pressure controlling member installed in the outer shell, the pressure controlling member comprising:
• a spring housing securely affixed to the outer shell and defining a first through hole, the spring housing having a valve biased to open when a cavity pressure exceeds a predetermind value;
• a spring disposed in the first through hole to bias the valve in a closed position;
• and
• a spring suspension member connected to the spring housing to support the spring to bias the valve in the closed position, wherein the spring housing has a groove around the outer circumference thereof and the spring suspension member is coupled with the spring housing with a step ring being placed in the groove of the spring housing.

A cooking apparatus comprising:

• an outer shell having an opening;
• an inner shell disposed inside the outer shell through the opening, forming a cavity between the outer and inner shells;
• and
• a pressure controlling member installed in the outer shell, the pressure controlling member comprising:
• a spring housing securely affixed to the outer shell and defining a first through hole, the spring housing having a valve biased to open when a cavity pressure exceeds a predetermind value;
• a spring disposed in the first through hole to bias the valve in a closed position;
• and
• a spring suspension member connected to the spring housing to support the spring to bias the valve in the closed position, wherein the spring housing has a groove around the outer circumference thereof and the spring suspension member is coupled with the spring housing with a step ring being placed in the groove of the spring housing.