Spring safety valve with micro adjustment structure

Abstract

The invention discloses a spring safety valve with a micro adjustment structure, and belongs to the technical field of valves. The purpose is to solve the problem of large deviation of the pretensionforce of a screw adjustment spring in an existing spring safety valve. The safety valve comprises a spring cover, a backing plate, a spring, an adjusting screw and a valve stem, the spring cover is installed on the backing plate, the spring is located in the spring cover, the valve stem penetrates through the backing plate and the spring out of the top of the spring cover, an upper spring seat anda lower spring seat are arranged at both ends of the spring respectively, the lower spring seat is installed on the valve stem through a retaining ring, the adjusting screw penetrates through the spring cover to press the upper spring seat tightly, after the spring is compressed, a perpendicularity deviation angle D is generated between the retaining ring and the lower spring seat, the micro adjustment structure is installed on the outer wall of the spring cover, one end of the micro adjustment structure penetrates through the spring cover to be connected with the upper spring seat, and the position where the upper spring seat exerts force on the spring is changed through adjusting the other end of the micro adjustment structure. The safety valve has the characteristics of simple structure, convenient adjustment process and high adjustment accuracy.

Description

Technical field: [0001] The invention belongs to the technical field of valves, in particular to a spring safety valve with a micro-adjustment structure. Background technique: [0002] When the medium pressure in the boiler superheater reaches the setting pressure of the safety valve, the safety valve needs to be opened under the action of the medium force to discharge the excess medium and prevent the overpressure of the steam drum, so as to protect the normal operation of the boiler. Therefore, when the boiler is in normal operation, the safety valve is not allowed to open; when the boiler is overpressured, the safety valve must be opened accurately; when the boiler is depressurized, the safety valve must return to the seat under the specified pressure difference and seal. [0003] At present, the following three adjustment methods are usually used for the take-off accuracy and sealing performance of the spring safety valve: first, adjust the preload of the spring by adjus...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a spring safety valve with a micro-adjustment structure to solve the problems of poor adjustment accuracy of the adjustment screw of the existing spring safety valve, large setting deviation and unsatisfactory sealing performance caused by unbalanced spring force. The spring force is fine-tuned to improve the take-off accuracy and sealing performance of the spring safety valve

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