Eccentric expansion pipe sealing valve

Abstract

The invention belongs to the field of valves. The invention discloses an eccentric expansion pipe sealing valve. When the valve is opened and closed, the expansion pipe valve seat is inflated, expands and deforms, the diameter of the expansion pipe valve seat is increased, the total axial length of the expansion pipe valve seat is also increased, the expansion pipe valve seat is deformed due to the increase, and wrinkles appear at the contact position of the valve body; the expansion pipe assembly is changed into an outward extending type, so that the center of the outward extending type expansion pipe assembly can move, sealing is achieved in the displacement process, and the problems of deformation and wrinkling of the expansion pipe valve seat are solved.

Description

technical field [0001] The proposal relates to the field of valves, in particular to an eccentric expansion tube sealing valve; [0002] Because of its overhanging structure, the name "a kind of overhanging eccentric expansion tube sealing valve" will be used to describe it uniformly below. [0003] Among them, the extended expansion tube assembly of the valve is stretched and deformed when it is inflated with air or liquid, or when it is discharged with gas or liquid; [0004] The central point of the extended expansion tube assembly changes with the dynamic process of the valve from opening to closing or from closing to opening; [0005] That is, the initial position of the valve is in the open position, and then the extended expansion tube assembly is inflated with air or liquid until it reaches the closed position, and the center point of the extended expansion tube assembly has a dynamic offset distance; [0006] Or the initial position of the valve is in the closed pos...

AI Technical Summary

Problems solved by technology

The valve seat of the expansion tube assembly will be deformed by pressure, the cross section of the valve seat will be deformed under the pressure of the inflowing medium, and the external shape will change, for example, the outer circle of the cross section of the valve seat will be concave, or the valve seat will become The flat oval shape changes the flow form of the medium in the valve body cavity, causing large pressure fluctuations and affecting the process effect

[0014] 2. Same as problem 1, when the valve is in the open position, the medium pressure in the pipeline acts on the valve seat of the expansion pipe, and the valve seat of the expansion pipe is partially concave and deformed, which is inconsistent with the convex state of the valve seat when it is normally opened, causing its impact on the valve. The end of the seat, that is, the joint where the valve seat is connected to the pagoda of the expansion tube assembly, produces stress in different directions. Under long-term action, the valve seat is partially cracked

[0015] 3. When the valve is closed, the valve seat of the expansion tube is inflated and deformed, its diameter becomes larger, and its total axial length will also increase. This increase will cause deformation of the valve seat of the expansion tube, resulting in wrinkles at the contact position of the valve body. Sometimes it will be poorly sealed, and even cause the valve seat of the expansion tube to be damaged too quickly

[0016] 4. When the inlet and outlet pipes of the valve are located in the valve seat contact chamber 1, the valve will carry powder or fine particles, and when compressed gas is used to transport, the valve seat non-contact chamber 2 on the upper side of the valve body cavity, and the valve body cavity There will be a certain amount of material accumulation in the non-contact chamber 3 of the valve seat on the lower side. When the accumulation is large, it will affect the opening and closing of the valve, thereby affecting the performance.

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