On-line detection method of shut-off valve leakage rate

Abstract

The invention discloses an on-line leak rate detection device for a stop valve, and solves the problems of long detection time, uncertainty of leak points, low working efficiency and the like in the prior art. The on-line leak rate detection device comprises a valve body connected with a pressure measurement inlet pipeline and a pressure measurement outlet pipeline, and a valve core encapsulated in the valve body through inlet sealing rings and outlet sealing rings. The technical key point is that the valve body is provided with a pressure measurement hole with an interface valve; and the outlet end of the interface valve is respectively connected with a pressure measurement part and a pressure release valve through a tee joint to form a communicating pipeline. The on-line leak rate detection device is compact in structure and rational in design; according to the simple switching-on operation of the interface valve, the requirement for detecting the leak rate of one stop valve or multiple stop valves connected in parallel can be met; the leak point positioning speed is high, the on-line detection sensitivity is high, and the leak rate of each stop valve can be accurately detected in real time; and the detection precision of a flow metering device is guaranteed. The sealing surfaces of the inlet sealing rings and the outlet sealing rings of a single valve are used instead of a dual-valve group for leak detection, so that the blindness for determining the leak point during maintenance is avoided, the detection cost is reduced, and the checking work efficiency is obviously improved.

Description

technical field [0001] The invention relates to a detection method for verifying the accuracy of metering gas flow, in particular to an online detection method for the leakage rate of a cut-off valve used for verifying the accuracy of gas flow of metering and detection equipment such as flow standard devices, flow verification devices, and flow calibration devices. The invention belongs to the technical field of flow measurement and detection. Background technique [0002] Existing gas flow measurement mainly includes testing equipment such as flow standard devices, flow verification devices, and flow calibration devices. These gas flow metering devices use a large number of shut-off valves as the connection and cut-off parts of the metering pipeline. During use, it must be verified whether they are sealed. qualified. Whether the sealing performance of the cut-off valve itself can be detected on-line in real time is directly related to the accuracy of the above-mentioned ga...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an on-line detection method for shut-off valve leakage rate, which solves the problems of long detection time, undetermined leakage point and low work efficiency in existing detection pipelines. It has compact structure, reasonable design, and easy operation. Fast leak location, real-time and online detection, sensitive and accurate detection of the leakage rate of the shut-off valve, reducing the detection cost, ensuring the detection accuracy and verification efficiency of the flow metering device

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