Controllable double-protection fall lift spring safety valve and boiler steam-water system

Abstract

The invention relates to a controllable double-protection fall lift spring safety valve and a boiler steam-water system. The controllable double-protection fall lift spring safety valve comprises a valve body and a valve rod. A valve seat is arranged on the lower portion of an inner cavity of the valve body. A guide sleeve is arranged at the opening of the top of the inner cavity of the valve body. The lower portion of the valve rod penetrates in the guide sleeve, and the bottom end of the valve rod is in linkage connection with a valve clack capable of being in seal fit with the valve seat. An exhaust opening is transversely formed in the position, corresponding to the top of the valve seat, of the valve body. An upper spring seat and a lower spring seat are arranged on the upper portion of the valve rod. A spring is connected between the upper spring seat and the lower spring seat. The valve rod penetrates through the spring. The upper portion of the valve rod is sleeved with a shifting fork. The shifting fork is in linkage connection with a movement device through a connection device. The movement device is electrically connected with a pressure sensing device. An electromagnet is adopted by the controllable double-protection fall lift spring safety valve, the shifting fork is lifted through electromagnetic force, the valve rod is driven to be lifted, and the valve is driven to be opened for discharging.

Description

technical field [0001] The invention relates to a safety valve, in particular to a controllable double-protection full-opening spring safety valve and a boiler steam-water system. Background technique [0002] In order to prevent the overpressure of the steam drum, the power plant boiler usually installs an impulse safety device on the steam drum. This device opens the discharge medium through the pulse safety valve installed on the steam drum to reach the set pressure, thereby driving the main safety valve installed on the superheater. open. The device relies on the medium discharged from the pilot valve to drive the main valve to open. [0003] During the operation of the boiler, once the pulse safety valve (pilot valve) fails and the medium cannot be discharged to the main safety valve (the main safety valve is an inverted seal structure), it will cause the main safety valve to refuse to operate; Longer and longer, it may cause pressure decay due to old and blocked pipe...

AI Technical Summary

Problems solved by technology

During the reconstruction of the safety valve, it was found that although the full-opening spring safety valve can avoid the main safety valve refusal to operate due to the failure of the pilot valve, it cannot avoid the pressure attenuation caused by the aging of the boiler pipe, resulting in the pressure of the boiler drum reaching The set pressure of the safety valve, but the pressure of the superheater has not reached the set pressure, so the phenomenon that the full-open spring safety valve cannot be opened in time to discharge steam

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