Top assembling type fixed ball valve capable of pushing valve seats open by utilizing air pressure

Abstract

The invention discloses a top assembling type fixed ball valve capable of pushing valve seats open by utilizing air pressure, and relates to a top assembling type ball valve. The top assembling type fixed ball valve is characterized in that a runner of a valve body is cylindrical; a cavity is formed in the middle part of the valve body; a valve cover is fixedly arranged on the valve body through a bolt; a valve rod is arranged at the center of the valve body; a ball body is arranged in the valve body; the top end of the ball body is connected with the valve rod; the valve seats are respectively arranged in the valve body at two ends of the ball body; springs are arranged between the valve seats and the valve body; the springs, spring pressing rings, spring seat fireproof rings, O-shaped rings and the valve seats are respectively arranged in the valve body, and gland nuts are then arranged in the valve body for screwing; during assembling, sealing gaskets, pressure testing connectors and pressing nuts are respectively arranged on the valve body; after the assembling, the pressing nuts, the pressure testing connectors and the sealing gaskets are respectively disassembled, and screw plugs are arranged on the valve body. According to the top assembling type fixed ball valve disclosed by the invention, a piston effect is formed by utilizing low air pressure passing through air inlet holes, so that the valve seats can be pushed backwards, and the ball body can be arranged in the valve body; the design structure is simple, the installation and the use are convenient, the online maintenance time and the assembly time are saved, and the labor intensity is reduced.

Description

technical field [0001] The invention relates to a top-entry ball valve, in particular to a top-entry fixed ball valve whose valve seat is pushed open by air pressure. Background technique [0002] Since my country's reform and opening up, the national economy has grown rapidly, and technological innovation and independent innovation have become the mainstream of domestic industrial development. my country's industry is gradually developing in the direction of intensive, energy-saving, emission-reducing, and low-carbon. Top entry trunnion ball valves are widely used in oil and natural gas pipelines, and in oil extraction, oil refining, petrochemical, chemical, chemical fiber, metallurgy, electric power, nuclear power, food and paper making and other devices. The top entry ball valve is easy and quick to disassemble on the pipeline, and the maintenance is convenient and quick. When the valve fails on the pipeline and needs to be repaired, it is not necessary to disassemble t...

AI Technical Summary

Problems solved by technology

Top entry trunnion ball valves generally use screws to open the valve seat or use the adjusting nut to loosen the valve seat, put the ball in, and then tighten the adjusting nut to compress the spring to achieve sealing. During assembly, the spring compression is large, assembly is difficult, and the sealing specific pressure is large. , the valve operating torque increases accordingly

The technicians of scientific research units and enterprises are constantly exploring and researching, hoping to develop a ball valve with superior performance. Although some progress has been made, there are still technical problems that have not been overcome in practical application.

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