Pilot-operated blasting type pressure relief device

Abstract

The invention belongs to the overpressure protection technologies of pressure-bearing equipment and particularly discloses a pilot-operated blasting type pressure relief device which is composed of a pilot valve and a main valve. A piston type valve clack and a valve seat of the main valve serve as sealing pieces of the pressure relief device. When the valve clack is in close contact with the valve seat, sealing is achieved. When the valve clack is separated from the valve seat, pressure relief is achieved. A press rod is a critical component for controlling the device to be opened or closed and is installed outside a valve body of the pilot valve. One end of the press rod is connected with an adjusting screw on the pilot valve, and the other end of the press rod is connected with a valve clack of the pilot valve. The press rod is installed outside the valve body of the pilot valve as a load-bearing component and isolated from a medium, and influences of the temperature and corrosivity of the medium on the destabilizing pressure can be effectively avoided. The piston type valve clack and the valve seat form a sealing structure, the sealing effect is better, zero leakage can be achieved before opening, and the leakage problem happening when the pressure of a conventional safety valve approaches the opening pressure is solved.

Description

technical field [0001] The invention belongs to the overpressure protection technology of pressure-bearing equipment, and in particular relates to a pressure relief device. Background technique [0002] At present, pressure relief devices are widely used in various sectors of the national economy such as petroleum, chemical industry, power station, metallurgy, nuclear power, and national defense. With the improvement of production efficiency, relevant departments and enterprises have increasingly stringent requirements on environmental protection and safety. As an essential part of the emergency relief system, the performance and sealing requirements of the pressure relief device providing overpressure protection are also more stringent. [0003] Taking the ground flare system in the petrochemical industry as an example, the medium is usually flammable, explosive, poisonous and harmful chemical substances, and the operating pressure is relatively low, generally several thou...

AI Technical Summary

Problems solved by technology

Conventional safety valves are not suitable for working conditions where the pressure is lower than 100 kPa. At low pressure, there are many problems such as inaccurate opening pressure, large excess pressure, and untimely response.

Although the bursting disc has good sealing performance and quick response, because of its direct contact with the medium, its discharge pressure is greatly affected by the corrosiveness and temperature of the medium, and when the pressure fluctuates or circulates, the stress of the bursting disc often reaches yield Above the limit, plastic deformation is easy to occur, which will lead to changes in its properties, premature blasting, and large deviations in opening pressure

[0004] In addition, once the conventional safety valve and bursting disc pressure relief device releases pressure, the production system must be shut down and disassembled for recalibration or replacement. Maintenance is time-consuming and laborious, which is not compatible with the current long-term operation and improvement of production efficiency. highly disproportionate demands

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