Gasproof damper valve

Abstract

The invention relates to the technical field of mechanical sealing board plug valve, in particular to an air-tight board plug valve which comprises a valve seat, an upper valve cover, an upper valve cover hold-down bolt, a board plug, a board plug lock nut, a board plug push rod and a board plug push rod driving device; wherein, a special section rubber sealing ring provided with a cavity is arranged between the upper valve cover and the board plug, the outer side of the special section rubber sealing ring is contacted with the valve seat, and the inner side is contacted with a chuck ring of the sealing ring; the cavity of the special section rubber sealing ring is communicated with a venting cavity of the upper valve cover to form an air-tight cavity, and a compressed-air pipeline is connected with the venting cavity of the upper valve cover to charge the air-tight cavity. Sealing grooves are respectively arranged at the lower side of the upper valve cover, the upper end surface of the chuck ring of the sealing ring and the upper end surface of the valve seat and matched with preiection of the special section rubber sealing ring, thus ensuring the board plug valve to have good sealing structure. A solid lubricant column is arranged between the valve seat and the board plug. The air-tight board plug valve has the advantages of good sealing performance, flexible and convenient operation and long service life.

Description

technical field [0001] The invention relates to the technical field of mechanically sealed plug-in valves, in particular to an airtight plug-in valve. Background technique [0002] Mechanical seal gate valve is widely used in metallurgy, chemical industry, cement, mining and other industrial enterprises and institutions. The technical requirements for the mechanical seal gate valve are: good sealing performance, flexible and convenient operation, and long service life. The current common problems of various mechanical seal gate valves are: due to the unreasonable structure of the seal, the sealing performance is not good; because the seal is easily worn and cannot be compensated, the sealing performance gradually deteriorates; Due to the accumulation of large particles in the liquid and gas medium in the valve body, or the larger solid matter is stuck between the insert plate and the valve port groove, which hinders the operation of the insert plate, causing the insert plat...

AI Technical Summary

Problems solved by technology

The current common problems of various mechanical seal gate valves are: due to the unreasonable structure of the seal, the sealing performance is not good; because the seal is easily worn and cannot be compensated, the sealing performance gradually deteriorates; Due to the accumulation of large particles in the liquid and gas medium in the valve body, or the larger solid matter is stuck between the insert plate and the valve port groove, which hinders the operation of the insert plate, causing the insert plate to not close properly and reducing the The efficiency of the gate valve is reduced, and even the valve loses the function of closing

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