Suspended labyrinth sleeve structure

Abstract

The invention relates to a suspended labyrinth sleeve structure, and belongs to the technical field of fluid control valves. The suspended labyrinth sleeve structure comprises a valve body, an upper cover, a sleeve assembly and a valve core assembly; an inlet flow passage and an outlet flow passage are distributed on the valve body and are correspondingly arranged at the two ends of the valve body; the sleeve assembly is mounted on an upper cavity convex table of the valve body; the valve core assembly is arranged in the sleeve assembly; the valve core assembly adopts a pilot valve core structure, and can linearly move along the inner wall of the sleeve; an upper cover is arranged in the axial direction of the outlet flow passage of the valve body; a gasket is arranged between the valve body and the upper cover; and the valve body and the upper cover are connected into a whole through studs and nuts. The suspended labyrinth sleeve structure can effectively achieve the effect of pressure drop, the service life of the whole sleeve assembly is prolonged, a high temperature and high pressure can be borne, and the working conditions of a high pressure difference and a high sealing gradecan be adjusted. The suspended labyrinth sleeve structure is relatively low in machining precision requirement, the thrust of a required actuator is small and the sealing effect is reliable.

Description

technical field [0001] The invention relates to a sleeve structure, specifically a hanging labyrinth sleeve structure capable of withstanding high temperature and high pressure, adjusting high differential pressure, and requiring a leakage level of V or higher, belonging to the technical field of fluid control valves. Background technique [0002] The traditional sleeve valve structure usually only has two types: the split balance sealed sleeve regulating valve and the integral sleeve regulating valve. The above two sleeve structures require a set of gaskets on the upper and lower sides to ensure the leakage level. The lower gasket is to ensure that the valve does not leak inside, and the upper gasket is to prevent the medium from leaking out. Due to the existence of processing errors, if the positioning height of the valve body is greater than the positioning height of the sleeve, although the gasket can ensure the compression of the upper gasket at the first time through t...

AI Technical Summary

Problems solved by technology

Due to the existence of processing errors, if the positioning height of the valve body is greater than the positioning height of the sleeve, although the gasket can ensure the compression of the upper gasket at the first time through the tightening of the bolts and nuts to prevent the medium from leaking out, but because the lower gasket does not It is effectively compressed, causing the medium to flow out from the gasket; if the positioning height of the valve body is less than the positioning height of the sleeve, the upper gasket will cause leakage due to incomplete compression

Secondly, although the above two sleeve structures can achieve a certain effect of reducing pressure and noise through the noise reduction holes on the sleeve, when the adjusted pressure difference is greater than 4MPa, it is no longer possible to increase the hardness of the valve trim or pass through the holes. In order to reduce the pressure and reduce the noise, the noise of the on-site valve is large and the maintenance cycle of the valve trim is short.

Third, although the structure of the split-type balance-sealed sleeve regulating valve (a structure filled with glass fiber PTFE + single-seat hard seal) can reach the leakage level above V through conventional machining, but due to its upper seal It is sealed with glass fiber filled PTFE, so when the temperature is higher than 250°C, PTFE will fail; although the integral sleeve regulating valve can withstand high temperature, it adopts a hard seal structure with upper and lower double valve seats. Manual grinding can meet the leakage level of level V or above, but the success rate of one-time assembly is only 50%, resulting in repeated machining repair and manual grinding of the sealing surface, wasting labor and time costs, and low product interchangeability; at the same time After a long period of use, the damage and deformation of the sealing surface will cause the upper and lower sealing surfaces to fail to achieve the sealing effect at the same time, and eventually the leakage will exceed the standard.

From this, it can be concluded that the split-type balance-sealed sleeve regulating valve and the integral sleeve regulating valve cannot meet the application conditions of high temperature and high pressure, high pressure difference regulation, and leakage level requirements above level V.

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