shown in fig1 b the gasket compression stresses u201c u03c3 0 u201d distribution along with bending stresses u201c u03c3 f 0 u201d at the cover are shown in fig3 a the bending stresses have a distribution inverse to the one that is shown in fig1 a so that the upper layers of the cover are compressed and the lower layers are stretched fig4 a shows the same type of bolted flanged connection of the cover 42 and base 43 with flanges of inverse flexion under conditions of internal operating pressure u201c p u201d the flanges have the annular rigid contact support 41 and bolt contact supports 44 that are located on outer end of the flanges fig4 b is a schematic representation of circular plate corresponding to the cover 42 subjected to internal operating pressure u201c p u201d the flexion and rotation of the flanges are stopped by resistance of rigid supports and bolts on outer end of the flanges the gasket stresses u201c u03c3 u201d remain the stresses of compression along gasket contact surface but bending stresses u201c u03c3 f u201d at the cover change the sights so that the upper layers of the cover are stretched and lower layers are.