Low-pressure large-diameter safety valve

Abstract

The invention relates to a safety valve for performing overpressure protection on a pressure system, in particular to a low-pressure large-diameter spring direct-action type safety valve. A guiding sleeve is connected between a valve body and a cover plate; a bonnet is arranged on the cover plate; a positioning screw is connected to a side hole of the valve body in a valve body cavity; the valve body is connected with an adjusting ring; an O-shaped ring is inlaid in a groove formed by a valve clack and a disc holder and is fixed at the lower end of a body of the disc holder, and a formed combination is pressed on a sealing surface of the valve body through a spring; a spring and an upper spring seat are integrally positioned in a cavity formed by the disc holder, the guiding sleeve and the cover plate; the spring is directly arranged on the disc holder; an adjusting screw is arranged on the cover plate; a locking nut is arranged at the upper end of the adjusting screw; the adjusting screw conducts force to the spring through a thrust washer, a bearing and the upper spring seat, and setting pressure is adjusted; the disc holder and the sealing surface of the valve body are ground and then are in metal sealing; and the O-shaped ring and the sealing surface of the valve body are in nonmetal elastic sealing.

Description

technical field [0001] The invention relates to a safety valve used for overpressure protection of a pressure system, in particular to a low-pressure large-diameter spring direct-acting safety valve. Background technique [0002] The spring direct-acting safety valve is an automatic valve that automatically opens to discharge a certain rated amount of fluid when the system pressure reaches the set pressure, so as to prevent the pressure in the system from exceeding the predetermined safety value. When the pressure returns to normal, the valve will be closed again to prevent the medium from continuing to flow out. [0003] As the scale of petrochemical, electric power and other industries and the single equipment required continue to be large-scale, the traditional maximum flow path area code "T" (effective flow) specified in API526 "Steel Flange Pressure Relief Valve" The area of ​​the road is 167.742cm 2 ) safety valves often cannot meet the needs of actual use. If multi...

AI Technical Summary

Problems solved by technology

Although the sealing performance of pure non-metal elastic sealing safety valve is higher than that of metal sealing safety valve, it will have a great impact on the non-metallic sealing material during the closing process of the safety valve, which will have a great impact on its service life.

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