May I ask about the sealing principle of the two sides of the gasket in Wood seal?

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May I ask about the sealing principle of the two sides of the gasket in Wood seal? I’ve been learning about *Wood sealing recently, and I’m not quite sure about the diagrams in GB150. In particular, the sealing of the two sides of the pressure pad. As can be seen from the diagram, the pressure pad has three surfaces, and all three are angled slopes. I understand the function of the three surfaces to be as follows: 1. The upper surface is a surface under compression and restraint, and it does not participate in sealing. 2. Sealing is achieved through linear contact between the inner conical surface and the curved surface of the cover. 3. Sealing is achieved by the contact between the outer surface of the gasket and the end of the cylinder. Could someone help me explain this: How does the outside of this cushion come into contact with the end of the cylinder? Is the inner surface of the cylinder’s end a conical surface? If it is, what is the relationship between that angle and the angle on the outside of the cushion?