Low-pressure emptying type blasting needle valve

Abstract

The invention discloses a low-pressure emptying type blasting needle valve which comprises a valve body, a valve element, a blasting needle, a guide sleeve and a top plate. The valve element, the blasting needle, the guide sleeve and the top plate are arranged in the valve body. One end of the guide sleeve is connected to the valve body, and the other end of the guide sleeve is connected to the top plate. One end of the blasting needle is connected to the valve element, and the other end of the blasting needle is connected to the top plate. The guide sleeve penetrates through the valve element. The valve element can slide along the guide sleeve. Under the working conditions of the large pressure fluctuation and the high operation ratio, zero leakage and accurate pressure relief can be ensured, installing is easy and convenient, equipment and personnel can be effectively protected, and pollution to the environment from harmful media is reduced.

Description

Technical field [0001] The invention relates to the field of pressure relief devices, in particular to a low-pressure emptying type blasting needle valve. Background technique [0002] Existing low-pressure, large-caliber pressure relief devices are mainly rupture discs and emergency relief valves. [0003] Low-pressure rupture discs have poor stability and pressure relief accuracy. Under working conditions with large pressure fluctuations, the rupture disc may explode in advance; in addition, during the installation process, the flange bolts are likely to be blasted due to insufficient tightening force. The edge of the rupture disc will be destabilized in advance; and the rupture disc is greatly affected by temperature. In industrial production, due to the large temperature range and the large overpressure range, the rupture disc will not only explode prematurely, but may also lag behind. Blasting, which poses a great safety hazard. [0004] The emergency relief valve has the prob...

AI Technical Summary

Problems solved by technology

[0003] The stability and pressure relief accuracy of the low-pressure rupture disc are poor. Under the condition of large pressure fluctuation, it is easy to cause the rupture disc to burst in advance; in addition, during the installation process, it is easy to cause explosion due to insufficient tightening force of the flange bolts. In addition, the bursting disc is greatly affected by temperature. In industrial production, due to the large temperature range and the large overpressure range, the bursting disc will not only burst in advance, but also may lag behind. blasting, which poses a great safety hazard

[0004] The emergency relief valve has the problem of poor sealing. In extreme conditions, it is easy to cause a great safety risk. The valve is sealed by gravity, and the sealing cannot be guaranteed. When the system pressure reaches 70% of the valve set pressure, the valve will Leakage occurs immediately, so when the protected system is a precious medium, or the medium is toxic, harmful or corrosive, the valve tightness becomes the primary problem to be solved by the emergency relief device.

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