Sealing principle of C-type self-locking pneumatic joint (only for speculation, not specific):
During connection, the sealing mainly relies on two sealing rings, as well as the compression tongue of the spring and ball to deform it and seal it in contact with the conical surface of the male head.
After the male head is disengaged, the female head self-locking seal relies on the deformation of the tongue itself and the sealing ring for sealing.
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