Floating ball crown regulating type globe valve

Abstract

The invention relates to a floating spherical cap type adjusting stop valve which comprises a valve body, a valve seat, a valve core, a valve rod, a valve rod guide mechanism and a transmission mechanism, wherein the valve core adopts a floating spherical cap type valve core; the floating spherical cap type valve core comprises a sphere body, a spherical cap and a butterfly spring; a regular circular cone hole is formed in the center of the sphere body in the axis direction of the valve rod; the outer side of the upper end opening of the regular circular cone hole is an annular plane; the aperture of the lower end opening of the regular circular cone hole is larger than the aperture of an inner hole of the valve seat; a screw thread mutually matched with the lower end of the valve rod is manufactured on the inner wall of the upper end opening of the regular circular cone hole; the excircle surface of the spherical cap has a circular conical surface mutually matched with the regular circular cone hole of the sphere body; the lower end surface of the spherical cap has a spherical surface mutually matched with a sealing surface of the valve seat; the upper end surface of the spherical cap is a plane; and the butterfly spring is mounted between the upper end surface of the spherical cap and the lower end surface of the valve rod. According to the floating spherical cap type adjusting stop valve, the spherical cap and the valve seat have automatic centring and automatic absorption, thermal expansion and cold shrinkage functions, and the floating spherical cap type adjusting stop valve has the characteristics of high temperature resistance, low temperature resistance, flushing resistance, good sealing performance, long service life, and the like, and is applicable to adjusting or stop valves of high temperature, ultralow temperature, and abrasive medium working conditions.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a stop valve. The invention is suitable for regulating or shut-off valves in the working conditions of high temperature, ultra-low temperature, high pressure and high abrasion medium. Background technique [0002] Globe valves are widely used in medium pipelines as a switch or to adjust medium flow. Its structure is generally composed of valve body, valve seat, valve core, valve stem, valve stem guide mechanism and transmission mechanism. Its sealing structure mainly includes flat seal and cone surface. Sealed structure. The flat sealing structure uses the flat sealing surface of the valve core and the flat sealing surface of the valve seat to press and seal each other. Between the sealing surfaces, the sealing fit between the valve core and the valve seat is affected, and the sealing surface is damaged, and the sealing surface of the valve core and the valve seat is easily eroded by the ...

AI Technical Summary

Problems solved by technology

The flat sealing structure uses the flat sealing surface of the valve core and the flat sealing surface of the valve seat to press and seal each other. Between the sealing surfaces, the sealing fit between the valve core and the valve seat is affected, and the sealing surface is damaged, and the sealing surface of the valve core and the valve seat is easily eroded by the medium and cavitation, the sealing performance is poor, and the service life of the product is short; the cone surface sealing structure The conical sealing surface of the valve core and the conical sealing surface of the valve seat are used to cooperate with each other for sealing. The main disadvantage is that the concentricity of the conical sealing surface of the valve core and the conical sealing surface of the valve seat is affected by the processing and assembly accuracy, and there is an error, which affects the sealing. Performance, under high temperature or ultra-low temperature conditions, it is easy to be stuck due to thermal expansion and cold contraction, and the sealing surface of the valve core and valve seat is easily eroded by the medium and cavitation, the sealing performance is poor, and the service life of the product is short

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