A mechanical valve with automatic shut-off function

Abstract

The invention discloses a mechanical valve with automatic cut-off function which can be applied in the production process of chemical materials, comprising a valve body, a valve seat, a valve core, elastic parts, a pneumatic mechanism and a magnet; the valve seat and the valve core are arranged In the valve body, the valve core is used to contact the valve seat to close the valve; the elastic member drives the valve core to maintain a distance from the valve seat; the pneumatic mechanism includes a cylinder, a piston, a piston rod and a pipe body, the cylinder is set in the valve body, and the piston is set in the In the cylinder, the two ends of the piston rod are respectively connected with the piston and the valve core, and one end of the pipe body is connected with the inner cavity of the cylinder, and the other extends to the outside of the valve body; the magnet is set on the side of the valve core away from the valve seat; the initial In the normal state, the valve core is adsorbed on the magnet. When the amount of gas entering the cylinder from the pipe body reaches a certain level, the air pressure of the gas will cause the valve core to separate from the magnet and then quickly fit on the valve seat. After using this valve, the flow cut-off of the valve occurs instantaneously, so there will be no situation that the flow rate becomes smaller and smaller during the flow cut-off process.

Description

technical field [0001] The invention relates to the field of valves, in particular to a mechanical valve with an automatic flow-off function. Background technique [0002] When water or other liquid materials are put into the pool or container through the pipeline, someone usually needs to stand by and wait for the liquid to reach the designated position, then close the valve and stop the liquid discharge. [0003] For example, in the production process of chemical materials, it is often necessary to put materials into containers for storage. During this process, a special person is required to wait by the side. Once the materials are full, the valve is closed, but when the volume of the container for storing materials is relatively large, the It will take a long time for the materials to be delivered, so the workers will have to wait for a long time; [0004] For another example, when water is put into the swimming pool, because the volume of the swimming pool is very larg...

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Problems solved by technology

However, in the follow-up analysis, the inventor found that the valve has the following shortcomings: to a large extent, the flow of liquid flowing through the valve is determined by the distance between the valve core and the valve seat, so when the valve core faces the valve During the movement of the seat, since the distance between the two will become smaller and smaller, the valve flow will become smaller as the later stage progresses, that is, as the liquid in the container (or pool) increases, the valve core will Gradually move closer to the valve seat, so the flow rate of the valve will gradually decrease, and the final result is that the time of draining the liquid will be prolonged, and it will take longer for the liquid to reach the specified depth

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