Seal-ring-bearing three-eccentric seal butterfly valve

Abstract

The invention discloses a seal-ring-bearing three-eccentric seal butterfly valve, relating to the field of valves. The seal-ring-bearing three-eccentric seal butterfly valve comprises a valve body, an operating mechanism, a disk plate assembly and a valve stem, wherein the operating mechanism is positioned outside the valve body; one end of the valve stem is positioned outside the valve body and connected with the operating mechanism, and the other end is positioned inside the valve body and connected with the disk plate assembly; a valve body sealing surface used for matching with the disk plate assembly is arranged inside the valve body; the disk plate assembly comprises a disk plate, a pressure plate and a seal ring; the seal ring comprises a seal end and a fixed end; the fixed end is positioned between the disk plate and pressure plate; the seal end is positioned outside the disk plate, and used for matching with the valve body sealing surface; and the cross-section area of the seal end is smaller than that of the disk plate. The seal-ring-bearing three-eccentric seal butterfly valve can implement zero medium leakage, well improve the opening and reversing sealing properties, and widen the application range of the three-eccentric seal butterfly valve.

Description

technical field [0001] The invention relates to the field of valves, in particular to a triple-eccentric sealing butterfly valve with sealing rings. Background technique [0002] Butterfly valve is a regulating valve with simple structure, and it can also be used for switch control of low-pressure pipeline medium. Butterfly valve usually includes valve body, valve stem, disc plate and sealing ring. Inside, the valve stem is connected to the disc, and the sealing ring is matched with the disc. [0003] Traditional butterfly valves are usually used in occasions with normal temperature, low pressure and low sealing requirements. However, with the continuous development of modern technology and material industry, in order to meet the requirements of various working conditions, butterfly valves have experienced successively from concentric to single eccentric, Evolution of double and triple eccentricity. Due to its excellent performance, triple eccentric butterfly valves are wi...

AI Technical Summary

Problems solved by technology

[0006] (1) The sealing surface of the triple eccentric butterfly valve is a conical structure, which requires high machining accuracy and is difficult to process, especially for the triple eccentric butterfly valve with metal hard seal structure, it is very difficult to achieve zero leakage of the medium

[0007] (2) Due to the eccentricity of the center of rotation of the valve stem of the triple eccentric butterfly valve and the center of the valve body, there is an unbalanced torque of the medium, which has a greater adverse effect on the opening and reverse sealing of the butterfly valve. Due to the existence of these two reasons, The application range of the butterfly valve is greatly affected

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