Abstract: A pressure cooker which uses an elastic C-connector to fix a cover to a cooker body in airtight manner. Loosening and tightening of the C-connector are controlled by an operating handle. The operating handle has a relief valve at one end. The relief valve has a valve body and an adjustable valve rod so that when the C-connector is in tightening condition, the valve body is located on a valve seat on the cover. Pressure can be relieved through the relief valve or edge of the C-connector after it reaches a certain level. Pressure in the cooker will raise two safety pins to restrict movement of a rod so that removal of the valve body from the valve seat is impossible and thus removal of the cover is prevented for safe operation.

Abstract: Disclosed herein is a constant pressure cooker which has a coupling steel ring attached to the peripheries of the cover of the cooker and the cooker body and there is an opening at the coupling ring so that an adjustment of the opening can adjust the tightness of the cooker in its application. The said coupling steel ring has a springband on its upper ring surface or the steel ring itself is made of elastic steel material so that whenever the pressure cooker is tightly sealed and the steam therein has reached its predetermined saturated pressure, there is a upper thrust force, then, the spring band at the coupling steel ring moves upwards or the elastic steel ring expands so that the saturated steam in the cooker is released and the steam pressure in the cooker keeps constant.