A power station regulating valve with a metal sealing ring structure that is easy to disassemble

Abstract

The invention relates to a metal seal ring. The metal seal ring is characterized in that the seal ring is annular, the lower end of the seal ring is provided with a wedge-shaped sharp part, the upper end of the seal ring is provided with an annular rib edge protruded in the radial direction, and the upper surface of the annular rib edge is of a self-centering spherical surface or conical surface structure. The metal seal ring has the advantages that when the seal ring is applied to a valve, a pressing flange can still be automatically aligned with the seal ring when being not horizontal, circumferential stress balance is promoted, and a sealing stress state is improved. The upper annular rib edge of the seal ring enables the seal ring to provide a dismantling strength point and simultaneously has the effect of a reinforcing rib; not only is structural rigidity improved, but also seal ring machining, valve assembly and valve dismantling are facilitated, machining clamp design is simplified, machining precision is improved, and sealing performance is guaranteed finally.

Description

technical field [0001] The invention relates to a sealing ring, and also relates to a power station regulating valve adopting a sealing ring structure. Background technique [0002] The power station control valves used for thermal power steam units are mainly distributed in the three major systems of boilers, steam turbines and auxiliary machines. The thermal control technology of thermal power plants generally takes the safe and economical operation of the unit as the main goal, and various regulating valves become special auxiliary equipment for safe operation. The higher the parameters of the unit, the greater the capacity of the unit, and the higher the performance requirements for the power station control valve (including: minimum flow valve, feed water bypass control valve, desuperheating water control valve, etc.), such as sealing performance, regulation characteristics, and reliability requirements. [0003] For example: in the current power station control valve ...

AI Technical Summary

Problems solved by technology

Although it can meet the sealing requirements to a certain extent, it also has certain disadvantages: it will be very difficult to disassemble and disassemble the valve due to the swelling and crushing of the wedge-shaped tip

Moreover, due to structural reasons, this kind of sealing ring has poor rigidity, is extremely easy to deform, and has poor processing technology. It has high requirements for fixture clamping, which is not conducive to improving the processing accuracy, and it is difficult to ensure the sealing performance required by the design.

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