Sealing structure of valve body, valve and CFLVV valve

A sealing structure of a valve body, wherein the sealing structure is provided in a valve body of a valve;

• a small discharge port and a large discharge port wound around the small discharge port are provided on a top surface of an inner cavity of the valve body;
• the small discharge port corresponds to a first exhaust passage, and the large discharge port corresponds to a second exhaust passage;
• a small valve core corresponds to the small discharge port, and a large valve core corresponds to the large discharge port;
• the sealing structure comprises:
• a sealing part provided in the inner cavity of the valve body and located between the large valve core and the top surface of the inner cavity of the valve body, for cooperating with the large valve core to seal the large discharge port and close the second exhaust passage, forming a first communication passage communicating the inner cavity of the valve body with the small discharge port, wherein a bottom end of the first communication passage corresponds to the small valve core;
• when it is required to close the large discharge port, the large valve core slides to a closed position and cooperates with the sealing part to seal the large discharge port, and closes the second exhaust passage to form the first communication passage;
• when it is required to close the small discharge port, the small valve core slides to a closed position and cooperates with the bottom end of the first communication passage to seal the small discharge port and close the first exhaust passage
• wherein the large discharge port is a plurality of large exhaust holes provided around the small discharge port;
• the sealing part comprises a sealing assembly including a number of first and second seals;
• the first seals are respectively provided at the corresponding large exhaust holes for forming a second communication passage communicating the inner cavity of the valve body with the large exhaust holes;
• and
• the second seal is provided at the small discharge port for forming the first communication passage.

A sealing structure of a valve body, wherein the sealing structure is provided in a valve body of a valve;

• a small discharge port and a large discharge port wound around the small discharge port are provided on a top surface of an inner cavity of the valve body;
• the small discharge port corresponds to a first exhaust passage, and the large discharge port corresponds to a second exhaust passage;
• a small valve core corresponds to the small discharge port, and a large valve core corresponds to the large discharge port;
• the sealing structure comprises:
• a sealing part provided in the inner cavity of the valve body and located between the large valve core and the top surface of the inner cavity of the valve body, for cooperating with the large valve core to seal the large discharge port and close the second exhaust passage, forming a first communication passage communicating the inner cavity of the valve body with the small discharge port, wherein a bottom end of the first communication passage corresponds to the small valve core;
• when it is required to close the large discharge port, the large valve core slides to a closed position and cooperates with the sealing part to seal the large discharge port, and closes the second exhaust passage to form the first communication passage;
• when it is required to close the small discharge port, the small valve core slides to a closed position and cooperates with the bottom end of the first communication passage to seal the small discharge port and close the first exhaust passage
• wherein the sealing part comprises a sealing assembly including a large sealing ring, a medium sealing ring, and a small sealing ring;
• the large sealing ring and the medium sealing ring are both provided on the top surface of the inner cavity of the valve body, and correspond to the large discharge port;
• the large sealing ring is sleeved on the large discharge port;
• the medium sealing ring is located between the large discharge port and the small discharge port;
• and
• the small sealing ring is provided on the top surface of the inner cavity of the valve body for forming the first communication passage.