Core switching and sealing system of valve

Abstract

The invention discloses a core switching and sealing system of a valve and belongs to the field of core sealing. The system comprises a valve rod with an annular groove and a plastic gasket in the same volume as the annular groove, wherein the annular groove has a large cavity and a small opening and is used for completely clamping the plastic gasket in the annular groove; and the thickness of the plastic gasket and the depth of the annular groove are equal, and the plastic gasket is used together with the annular groove to complete the sealing of the valve. The annular groove is designed with the shape with the large cavity and the small opening for completely clamping the plastic gasket in the annular groove, the volume of the annular groove is equal to that of the plastic gasket and the thickness of the plastic gasket is equal to the depth of the annular groove, so that the plastic material has no space for cold flows and the valve sealing is reliable even in alternating temperature environments are guaranteed effectively; and at the same time, the plastic gasket cannot separate from the valve rode due to the clamping action of the annular groove.

Description

Technical field [0001] The invention relates to the field of core sealing, in particular to a core switch sealing system of a valve. Background technique [0002] "Valve" is a device used to control the direction, pressure, and flow of fluid in a fluid system. The valve is a control component in the pipeline fluid conveying system. It is used to change the section of the passage and the direction of the medium flow. It has the functions of diversion, cutoff, adjustment, throttling, check, diversion or overflow pressure relief. Valves used for fluid control, from the simplest shut-off valve to various valves used in extremely complex automatic control systems, have a wide variety and specifications. The most important part of the valve is the sealing system directly related to the open and closed states, because once the core switch sealing system of the valve fails, the fluid cannot be completely shut off, resulting in waste of resources and loss of public property. [0003] Take...

AI Technical Summary

Problems solved by technology

However, there is a problem with this sealing design method: After the globe valve is switched on and off for a period of time, due to the plastic material of the plastic gasket flowing into the gap, the plastic gasket may be separated from the valve stem when the valve needs to be opened, resulting in Problems with seal failure, such as Figure 5 to Figure 8 shown

[0006] Although the above-mentioned solutions have solved the problem of the plastic gasket being separated from the valve stem to a certain extent when the valve needs to be opened, they cannot fundamentally eliminate the assembly gap, and still leave a cold flow space for the plastic gasket, resulting in plastic When the gasket is stressed, cold flow will be generated, which will weaken the sealing effect; if it is used for a long time, especially when working in an alternating temperature environment with a difference between high and low temperature exceeding 50 degrees Celsius, the deformation caused by cold flow will be more severe, and the weakening of the sealing force will be More significantly, thus greatly reducing the service life of the valve

Moreover, due to the complex structure of these methods, the manufacturing cost increases, which directly affects the popularization of products.

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