Abstract: The cooking pressure setting valve (1) for a pressure cooker (2, 3) comprises a setting knob (6) housed in the radial handle of the cooker lid (3), an outer casing (5) covered by the setting knob (6), a central valve body (10) provided with a cap disc (19) for sealing with the setting knob, a valve seat (9) an a valve member (8) with a axial central hole in communication with a diaphragm (18), a pressure regulating spring (11), an axial pressure indication stem (15) pushed by the diaphragm and guided by cap disc, and a pivoting spherical shell (16) jointed to the axial stem and visible from the outside of the setting knob.