Valve with valve body, and crankcase ventilation device

A valve comprising:

• a valve housing;
• a valve seat arranged in the valve housing;
• a valve body holder arranged in the valve housing and comprising at least one fluid-permeable flow opening;
• a valve body arranged in the valve body holder in the valve housing, wherein the entire valve body is configured to be axially displaced between an open state of the valve and a closed state of the valve;
• wherein the valve body comprises an envelope surface that comprises a sealing region configured to fluid-tightly contact the valve seat in the closed state of the valve and further comprises a base region adjoining the sealing region in a longitudinal direction of the valve body;
• wherein a cross-section contour of the envelope surface increases monotonously from the sealing region to the base region;
• wherein, in the open state of the valve, an axial end of the base region arranged opposite the sealing region contacts the valve body holder;
• wherein the envelope surface further comprises a weakened region connecting the sealing region and the base region to each other;
• wherein the weakened region comprises a reduced stiffness in relation to the longitudinal direction of the valve body;
• wherein the valve body is formed of a valve body material comprising a thermoplastic polyhalogen olefin.