Top entry bellows trunnion ball valve

Abstract

The invention discloses a top assembly type corrugated fixed ball valve which is simple in structure, low in manufacturing cost and high in sealing performance. According to the technical scheme, the ball valve is characterized in that a valve body is provided with an inflow channel, an outflow channel and a valve cavity communicated with the inflow channel and the outflow channel; a valve ball is disposed in the valve cavity, the valve rod is fixedly connected with the valve ball, sealing filler is arranged between the valve rod and a valve deck, a valve seat positioning element is arranged on the valve body, and a valve seat is provided with a positioning part matched with the valve seat positioning element; a corrugated pipe assembly is arranged at one end of the valve seat, and the corrugated pipe assembly comprises a corrugated pipe and a sealing sleeve arranged on the corrugated pipe in a sleeving mode; the other end of the valve seat abuts against the valve ball and is sequentially sleeved with a leaf spring and an adjusting ring, and the adjusting ring is in threaded connection with the valve seat; one end face of the sealing sleeve abuts against the inner side wall of the valve body, and the other end face of the sealing sleeve abuts against the leaf spring; when the adjusting ring rotates, the adjusting ring presses the sealing ring through the leaf spring.

Description

technical field [0001] The invention relates to the field of valves, more specifically, it relates to a top entry type bellows fixed ball valve. Background technique [0002] Ball valves are widely used in various fields such as petroleum, chemical industry, steel, metallurgy and electric power. Compared with other valves that control the flow of medium in pipelines, ball valves have the advantages of small medium resistance and convenient operation. The traditional two-piece or three-piece split side-mounted trunnion ball valve is limited in structure, and the middle cavity of the valve body is connected by bolts. There are many leakage points and cumbersome assembly and maintenance, which limits its online maintenance function and increases the risk of production stoppage. [0003] Among them, in order to improve the sealing performance of the ball valve, the top entry trunnion ball valve is used instead of the side entry trunnion ball valve. The top entry ball valve is ge...

AI Technical Summary

Problems solved by technology

Traditional two-piece or three-piece split side-mounted trunnion-mounted ball valves are limited in structure, and the middle cavity of the valve body is connected by bolts. There are many leakage points and cumbersome assembly and maintenance, which limits its online maintenance function and increases the risk of production shutdown.

[0003] Among them, in order to improve the sealing performance of the ball valve, the top entry trunnion ball valve is used instead of the side entry trunnion ball valve. The top entry ball valve is generally composed of a valve body, a valve seat, a ball, a valve stem, and a bonnet. The valve body of the top-entry trunnion-mounted ball valve is a whole, which is reduced by one to two pieces compared with the body of the two-piece or three-piece split side-entry trunnion-type ball valve. Two leakage points improve the sealing performance, but the valve seat is placed in the valve body, and the outer wall of the valve seat is sleeved with a sealing ring that conflicts with the inner wall of the valve body to form a radial seal. , sealing ring, and the inner side wall of the valve body require extremely high processing precision, which increases the manufacturing cost of the ball valve. When the sealing ring is worn during use, leakage is prone to occur, reducing the sealing performance of the ball valve

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