Pressure relief device

Abstract

The invention provides a pressure relief device. The pressure relief device comprises a sealing valve, a blasting needle, a valve rod mechanism, a power mechanism and a compression bar mechanism; thevalve rod mechanism bears the pressure of the inlet end of the sealing valve and axially extrudes the blasting needle; the power mechanism is connected to the sealing valve and has a tendency to openthe sealing valve; when the blasting needle is stable, the valve rod mechanism is not triggered, levers of the compression bar mechanism are limited, the levers limit baffles so as to lock the power mechanism in a state that the sealing valve is closed; when the pressure exceeds a set pressure value, the blasting needle is unstable, when the valve rod mechanism is triggered, the levers do not limit the baffles, so that the levers lose the limiting effect on the power mechanism, and the power mechanism drives the sealing valve to be opened for pressure relief. According to the pressure relief device, the pressure relief precision is high, debris is not generated in the pressure relief process, the maintenance cost is avoided, reset is simple, and the shutdown cost is low; and in addition, the levers and the baffles are coordinated with the action of a control lever, so that the influence of the friction force can be reduced, and therefore the pressure relief device can be more sensitivein response.

Description

technical field [0001] The present invention generally relates to a pressure relief device for overpressure protection of pressure equipment. Background technique [0002] At present, the safety pressure relief devices commonly used in the market include burst discs and spring safety valves. These pressure relief devices are cheap and widely used, but they generally have the following disadvantages: 1. Low efficiency, time-consuming installation and maintenance; 2. Poor accuracy, Usually the control accuracy is above ±10%; 3. It is inconvenient to replace and replace. When replacing parts, the system needs to stop working, resulting in downtime losses; 4. Poor fatigue resistance. Due to the lack of fatigue resistance, bursting discs or valves often fail. unable to work properly. Due to the above disadvantages, these safety pressure relief devices cannot well meet the needs of the market. [0003] Therefore, there is a need for a pressure relief device that at least partial...

AI Technical Summary

Problems solved by technology

[0002] At present, the safety pressure relief devices commonly used in the market include burst discs and spring safety valves. These pressure relief devices are cheap and widely used, but they generally have the following disadvantages: 1. Low efficiency, time-consuming installation and maintenance; 2. Poor accuracy, Usually the control accuracy is above ±10%; 3. It is inconvenient to replace and replace. When replacing parts, the system needs to stop working, resulting in downtime losses; 4. Poor fatigue resistance. Due to the lack of fatigue resistance, bursting discs or valves often fail. unable to work properly

Due to the above shortcomings, these safety pressure relief devices cannot meet the needs of the market well

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