squib shutoff valve

Abstract

The invention provides a squib shut-off valve, which comprises a valve body provided with a valve chamber, a water inlet, a water outlet, and a control assembly. The water inlet and the water outlet can be closed, the two ends of the valve stem are connected to the valve body in rotation, a piston is arranged in the control assembly, a first control chamber and a second control chamber are arranged on both sides of the piston, and the valve stem One end passes through the valve body and is vertically connected to one end of the transmission assembly, and the other end of the transmission assembly is fixedly connected to the transmission rod. When the pipe bursts, the second cavity reaches the pressure and the pressure relief port opens, and the butterfly plate executes the valve closing action. , the valve stem rotates to drive the power transfer assembly and the transmission rod to move the piston to the right. The end of the second control chamber away from the first control chamber is provided with a gas supply assembly. The first control chamber is connected to the second control chamber through a pressure relief valve. The cavity is connected, and the present invention has simple structure, higher sensing precision, avoids misoperation of the valve, and is simple and intuitive to operate.

Description

technical field [0001] The invention belongs to the technical field of valves, and relates to a shut-off valve, in particular to a burst pipe shut-off valve. Background technique [0002] Water pipelines, especially large pipelines, will cause serious secondary disasters when accidental pipe burst occurs. At this time, it is necessary to quickly cut off the upstream pipeline and stop the loss in time. If you rely on humans to rush to the site to close the valve after receiving complaints, serious consequences have been caused. Therefore, it is necessary to develop a valve that automatically and quickly cuts off the pipeline in the event of a pipe burst, and in the process of automatic cut-off, the valve cannot be closed too fast to cause secondary valve water hammer. In the existing technology, there is a type of pipe burst cut-off valve, which adopts a conventional butterfly valve and uses a hydraulic device to sense the flow rate of the medium through the induction device....

AI Technical Summary

Problems solved by technology

[0002] Water pipelines, especially large pipelines, when an accidental pipe burst occurs, causing serious secondary disasters. At this time, it is necessary to quickly cut off the upstream pipeline and stop the damage in time. If people rush to the scene to close the valve after receiving complaints, serious consequences have already been caused. , so it is necessary to develop a valve that can automatically and quickly cut off the pipeline in the event of a pipe burst, and in the process of automatic cutoff, the valve cannot be closed too fast to cause a second valve closing water hammer

In the existing technology, there is a type of burst pipe cut-off valve, which uses a conventional butterfly valve, uses a hydraulic device, and senses the medium flow rate through a sensing device. When a burst pipe is found, the hydraulic device drives the valve to close; the medium flow rate sensing device of this technology senses The flow rate is a local flow rate, which is amplified by a mechanical device and used as the control unit of the hydraulic system. The main body senses the flow velocity and controls the structure to realize the shutdown of the squib

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