Safety valve

Abstract

The invention provides a safety valve. The safety valve comprises a valve body, a valve bonnet, a valve rod arranged in the valve body, a sealing assembly and an elastic reset mechanism connected to the valve rod in a sleeving mode. The valve body is provided with an air inlet and a pressure relief opening. A bearing table is arranged in the valve body and provided with an outer conical bearing face. The sealing assembly comprises a sealing gasket and a guide plug. The sealing gasket is provided with a clamping groove matched with the bearing table. An inner conical face matched with the outer conical bearing face is arranged in the clamping groove. A groove surrounding the bearing table is formed in the valve body. The lower end of the sealing gasket can stretch into the groove. The two ends of the elastic reset mechanism abut against the step face of the valve rod and the step face of the valve bonnet correspondingly. The sealing gasket and the guide plug move up and down to open and close the pressure relief opening. According to the safety valve, interference of external objects to movement of the valve rod is avoided, the sealing performance can be further improved, and the service life of the safety valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a safety valve. Background technique [0002] The safety valve is a special valve whose opening and closing parts are in a normally closed state under the action of external force. When the medium pressure in the equipment or pipeline rises above the specified value, it discharges the medium to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. . Its action reliability and performance are directly related to equipment and personal safety. [0003] According to the structural form, the safety valve can be divided into pendant type, lever type, spring type and pilot type (pulse type). The bottom of the valve stem of the spring-loaded safety valve is generally in direct contact with the gasket, and the end of the valve stem will move to the outside of the valve body, which is easily disturbed by external objects...

AI Technical Summary

Problems solved by technology

The bottom of the valve stem of the spring-loaded safety valve is generally in direct contact with the gasket, and the end of the valve stem will move to the outside of the valve body, which is easily disturbed by external objects; , it is prone to the situation that the valve stem cannot be effectively returned and the sealing effect is not good

If it is used in such complex working conditions in mining areas, the safety performance cannot be guaranteed, which endangers the safety of operators.

Secondly, the design of the pressure relief channel of the safety valve is unreasonable, and it is not easy to quickly release the pressure

Furthermore, the long-term reciprocating movement of the valve stem is prone to chipping, and the resulting chipping and other impurities are deposited on the sealing surface inside the valve body, affecting the sealing effect

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