Low-flow-resistance flange cast steel straight-through stop valve

Abstract

The invention provides a low-flow-resistance flange cast steel straight-through stop valve which comprises a valve body, a medium inlet and a medium outlet are formed in the two sides of the valve body respectively, the upper end of the valve body is fixedly connected with a valve deck through a valve deck screw, a valve rod is arranged in the center of the valve deck in a penetrating mode, and a hand wheel is fixed to the top of the valve rod in a threaded mode. The bottom of the valve rod penetrates into the valve body to be connected with a valve disc, communication of a medium inlet and a medium outlet on the two sides of the valve body is closed through the valve disc, the valve rod comprises an outer screw rod and an inner screw rod which are different in screw pitch, and the outer screw rod and the inner screw rod are connected with the center and the outer edge of the valve disc respectively. The outer edge of the valve disc moves downwards relative to the center of the valve disc, the valve disc is made to be integrally bent to form an upwards-protruding curved surface, the valve disc with the curved surface conducts flow guiding on a circulating medium, the circulating resistance of the medium is reduced, meanwhile, the scouring effect on the valve disc during medium circulation is reduced, the service life of the valve disc is prolonged, and good development prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a shut-off valve. Background technique [0002] Globe valve, also known as cut-off valve, is a mandatory sealing valve, and its performance and quality play a very important role in the pipeline system. The flow resistance coefficient of the valve is one of the important indicators to measure the power consumption in the pipeline system. When the flowing medium flows through the valve of the pipeline system, a local resistance will be generated. Overcoming this resistance requires excessive energy consumption; [0003] By optimizing the angle of the circulation pipeline of the medium in the valve, it can play a role in reducing the flow resistance coefficient of the valve. From the beginning to the end of the medium outlet, the inner cavity of the valve body is provided with multiple arc transitions, thereby reducing the medium energy loss caused by its own structure in the pipel...

AI Technical Summary

Problems solved by technology

[0003] By optimizing the angle of the flow pipeline of the medium in the valve, it can reduce the flow resistance coefficient of the valve. For example, a low-flow resistance flanged cast steel straight-through globe valve with application number CN202110300292. From the beginning to the end of the medium outlet, the inner cavity of the valve body is provided with multiple arc transitions, thereby reducing the energy loss of the medium caused by its own structure in the pipeline system, reducing the flow resistance of the medium, and reducing the interference on the flow of the medium. When the opening height of the valve disc remains unchanged, its flow resistance coefficient can be reduced by less than 50%. However, in the valve body, in addition to the valve body and the valve body, there is also the valve disc in contact with the circulating medium. The traditional valve disc is generally a flat structure. After the valve is opened, it will not Failure to fit the inner wall of the valve will also create resistance to the flow of the fluid medium in the valve, and due to the scouring effect of the fluid medium on the valve disc, it will also shorten the life of the valve disc itself and accelerate the damage of the valve body;

Images