Automatic permanent magnet earthquake gas closing valve

Abstract

The invention relates to an automatic permanent magnet earthquake gas closing valve which comprises an upper valve body and a lower valve body. The lower end portion of the upper valve body is in butt joint with the upper end portion of the lower valve body to form an upper valve body cavity and a lower valve body cavity, a pin is installed at the lower position of the lower valve body, an upper valve cover is installed at the top of the upper valve body, a permanent magnet device is installed at the top end of the central position of the lower end face of the upper valve cover, a circular magnetizer is arranged below the permanent magnet device and concentrically connected with the upper end face of a valve rod with a T-shaped cross section, the lower end of the valve rod is connected with a heavy hammer through a connector, and a threshold controller is arranged below the heavy hammer and is in butt joint with the upper end of a top shaft of a rack installed in the lower cavity. The automatic permanent magnet earthquake gas closing valve is simple in structure, reasonable in design and low in cost, overcomes the defects that an electromagnetic valve needs a power supply and the closing valve value of an automatic fully-mechanical earthquake gas closing valve is nonadjustable, and can be used for closing large valves of gas pipelines automatically under the condition of strong earthquakes and avoid leakage and secondary disasters caused by the fact that the gas pipelines are damaged.

Description

technical field [0001] The invention relates to a large-diameter valve, in particular to a valve for automatically closing a gas pipeline when a strong earthquake occurs. Background technique [0002] At present, solenoid valves are often used for the safety control of oil and gas pipelines. The control of the solenoid valves requires alternating current or direct current, and consumes a lot of power. During strong earthquakes, the general power grid is paralyzed and cannot be controlled. my country has developed small-caliber and medium-caliber seismic gas automatic closing valves, but the sensitivity cannot be adjusted, and it is not suitable for earthquake emergency disposal of large-caliber valves in medium and high-pressure gas pipelines. Contents of the invention [0003] The object of the present invention is to overcome the disadvantages in the above-mentioned technologies, and provide a permanent magnet automatic seismic gas shut-off valve with simple structure, r...

AI Technical Summary

Problems solved by technology

[0002] At present, solenoid valves are often used for the safety control of oil and gas pipelines. The control of the solenoid valves requires alternating current or direct current, and consumes a lot of power. During a strong earthquake, the general power grid is paralyzed and cannot be controlled.

my country has developed small-caliber and medium-caliber seismic gas automatic closing valves, but the sensitivity cannot be adjusted, and it is not suitable for earthquake emergency disposal of large-caliber valves in medium and high-pressure gas pipelines

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