Metal hard seal ball valve

Abstract

The invention discloses a metal hard seal ball valve, which comprises a valve body, a valve cover, a valve ball, valve seats, a valve rod, a bracket and a drive device, wherein the valve body and the valve cover are connected to form a cavity, the valve ball provided with a through hole is positioned in the cavity, the upper end of the valve ball is connected with the valve rod, two sides of the valve ball are provided with the valve seats respectively, the bracket is fixedly connected with the valve body through bolts, the drive device is connected with a valve rod shaft through the bracket, the valve seats are made of a metal material, and a sealing gasket, a pressure ring and a belleville spring are arranged between the valve base and the valve body in turn. The metal hard seal ball valve adopts a metal-metal dual sealing mode between the valve body and the valve seats, between the valve cover and the valve seats, and between the valve seats and the valve ball to greatly improve the sealability, and can be applied to a working condition at a temperature of more than 500 DEG C; besides, by spraying a hard alloy or a hardened material on the surfaces of the valve seats and the valve ball, the metal hard seal ball valve has necessary precision and hardness for sealing, and the specially manufactured elastic valve seats and the belleville spring have quite low operating torques.

Description

technical field [0001] The invention relates to a ball valve, in particular to a metal-to-metal sealed metal hard-sealed ball valve. Background technique [0002] Ball valves are mainly 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. However, the seats of traditional ball valves are generally made of soft materials. , because soft materials have better elasticity and greater compression, but their sealing is not very good, and their temperature resistance is not strong. Usually, the temperature they can withstand cannot exceed 300 ° C, which cannot meet the requirements of various industries at home and abroad for sealing. and high temperature requirements. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the purpose of the p...

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Problems solved by technology

[0002] Ball valves are mainly 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. However, the seats of traditional ball valves are generally made of soft materials. , because soft materials have better elasticity and greater compression, but their sealing is not very good, and their temperature resistance is not strong. Usually, the temperature they can withstand cannot exceed 300 ° C, which cannot meet the requirements of various industries at home and abroad for sealing. and high temperature requirements

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