Marine center type multi-layer hard seal butterfly valve

Abstract

The invention discloses a marine center type multilayer hard sealing butterfly valve comprising a drive portion, a valve body, a valve rod and a dish plate. The valve rod penetrates through the valve body, the outer end of the valve rod is connected with the drive portion, the dish plate is located in the valve body, one side of the dish plate is fixedly connected with the valve rod, the other side of the dish plate is fixedly connected with a sealing ring, the circumferential sealing surface of the sealing ring and the inner wall of the valve body are matched to form a sealing pair, and the sealing ring is formed by overlapping a plurality of sheet-shaped metal pieces. For two adjacent metal pieces, the outer ring of one metal piece and the inner wall of the valve body are matched to form a sealing pair, and the outer diameter of the other metal piece is smaller than the inner diameter of the inner wall of the valve body. After the multiple metal pieces are overlapped, a plurality of rings of gaps surrounding in the circumferential direction are formed in the circumferential sealing surface of the sealing ring. When the butterfly valve is closed, leakage does not exist, abrasion to the circumferential sealing surface of the sealing ring and the inner wall of the valve body is little, the sealing performance of the sealing ring is good, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a marine butterfly valve. Background technique [0002] In the prior art marine butterfly valves, the seal between the disc plate and the inner wall of the valve mostly adopts rubber seals. The rubber seals are easy to wear and are easily corroded by the fluid medium, and have a short service life and need to be replaced frequently. A general hard-sealed butterfly valve includes a valve body, a valve stem and a disc plate. The circumferential sealing surface of the sealing ring on the disc plate cooperates with the inner wall of the valve body to form a sealing pair. The sealing ring and the inner wall of the valve body are both made of metal materials. When the disc plate is closed, the sealing ring produces elastic deformation, so that the circumferential sealing surface of the sealing ring is closely matched with the inner wall of the valve body, so as to achieve the sealing ef...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a butterfly valve that does not leak when it is closed, is easy to leak, has poor sealing performance, needs to be replaced frequently, and has a short service life. The circumferential sealing surface of the ring and the inner wall of the valve body have little wear, the sealing performance of the sealing ring is good, and the marine center type multi-layer hard seal butterfly valve has a long service life.

Images