Cryogenic top-mounted fixed bevel ball valve

Abstract

The invention discloses a cryogenic top-mounted fixed bevel ball valve. The two side faces of a ball opening of a ball body are inclined wedge faces, the inclined wedge faces are parallel to the back bevel of a valve seat, a notch for installing a sealing ring I is formed in the abutting position of the valve seat and the ball body, a notch for installing a spring plug and a sealing ring II is formed in the abutting position of the back of the valve seat and the bevel of the valve body, and the upper end of the valve seat and a compression ring are positioned through a bevel shoulder of the compression ring. The cryogenic top-mounted fixed bevel ball valve has the beneficial effects that the problem that a traditional cryogenic top-mounted floating bevel ball valve can only be designed to be a low-class small-caliber valve due to structural limitation is solved, the structure can be used for a high-class fixed top-mounted ball valve, the problem that a sealing face formed by a ball body and a valve seat sealing ring of the traditional cryogenic top-mounted floating bevel ball valve is uneven in stress is solved, and the sealing reliability of the valve is improved.

Description

technical field [0001] The invention relates to a valve, in particular to a cryogenic top-mounted fixed inclined-plane ball valve. Background technique [0002] Cryogenic top entry ball valves are mainly used in liquefied natural gas (LNG), liquefied petroleum gas (LPG) storage tanks, air separation equipment and other devices to cut off or connect pipeline media. With the continuous expansion of the domestic LNG, LPG, and air separation equipment markets, the application market for cryogenic top-entry ball valves has also become broader, and the demand for cryogenic top-entry valves in the domestic low-temperature industry is also growing. [0003] At present, the typical cryogenic top-loading ball valves in the market can be divided into floating balls and fixed balls according to the ball structure. The cryogenic top entry ball valve with floating ball structure is often inclined floating ball valve, because the ball is floating, so it cannot withstand high medium pressu...

AI Technical Summary

Problems solved by technology

To ensure that the valve does not leak internally under low-pressure conditions, the spring preload must provide sufficient initial sealing specific pressure, which requires the valve to be tightly fitted between the ball and the sealing ring after installation, resulting in the general top entry The structure of the ball valve is relatively complicated, and a set of tooling needs to be designed for the valve of the corresponding specification to complete the assembly and disassembly of the valve, which makes its assembly, disassembly and maintenance more troublesome

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