Wedge block jacking valve

Abstract

The invention provides a wedge block jacking valve, relating to the valve technical field and solving the technical problems of improving working pressure and sealing property of valve and prolonging service life of sealing element. The jacking valve comprises a valve case, a sealing gasket, a valve plate, a driving device, an upper wedge block and a lower wedge block; wherein the valve case is composed of a hollow valve body and a valve cover closed at the upper part of the valve body, the front end of the valve cover is provided with a charging flange port communicated with the cavity of the valve body; the ring side of the sealing gasket is adhered with the lower surface of the valve cover along the circumference of the lower edge of the charging flange port; the driving device is fixed at the rear end of the valve body, and a push rod thereof is inserted into the cavity of the valve body; the lower wedge block is movably arranged on the bottom surface of the cavity of the valve body and is fixedly connected with the front end of the push rod of the driving device, the upper wedge block is arranged above the lower wedge block, and the two are movably conjuncted by a dovetail groove, and the conjuncted surface is sloped up from the front to back; and the valve plate is fixed at the upper part of the upper wedge block. In the wedge block jacking valve provided by the invention, deflection of sealing gasket is high and required driving force is small.

Description

technical field [0001] The invention relates to the technology of valves, in particular to the technology of a wedge lift valve. Background technique [0002] Valves are important components for connecting or blocking fluid passages. To judge the quality of the valve, the most important technical indicators are its pressure resistance and sealing performance, and its reliable service life, that is, it should ensure that it will not fail within a certain working period. Among the existing valves, most of the valves adopt a soft seal structure, that is, the valve plate (or disc) is pressed tightly, except for the valves with a hard seal structure in some occasions where the sealing requirements are not high and the fluid medium needs to overcome the erosion and wear of the sealing surface. The gasket achieves a seal. [0003] There are mainly two types of valves with soft seal structure. One is that the gasket and the valve plate (or disc) are always in contact, and the pre-...

AI Technical Summary

Problems solved by technology

[0003] There are mainly two types of valves with soft seal structure. One is that the gasket and the valve plate (or disc) are always in contact, and the pre-tightening pressure is formed by the interference assembly of the gasket and the valve plate (such as ball valves, flat gate valves, Plunger valve, etc.) or the pre-tightening pressure generated by the compression spring (such as rotary disc valve, etc.) to deform the gasket to achieve sealing. The valve using this sealing method determines the degree of pressure resistance and sealing due to the constant deformation of the gasket. degree, and the driving force required to close the valve is relatively large, so its working pressure is low and its sealing performance is poor, and there is always friction between the valve plate (or disc) and the gasket during the opening and closing of the valve, which will cause the gasket to produce There is no way to compensate for wear and tear, and in occasions with high pressure resistance and sealing requirements, a gasket structure with large deformation must be selected, which not only increases the driving force, but also increases the wear of the gasket, and its service life is longer. Short; another kind of valve with soft sealing structure (such as wedge gate valve, globe valve, butterfly valve, etc.), although the valve plate (or valve disc) is not in contact with the gasket most of the time during the switching process, the valve plate (or disc) During the process of deformation (i.e. closing the valve) when the valve disc) compresses the gasket, the moving direction of the valve plate (or valve disc) is not perpendicular to the sealing surface of the gasket, so the distance between the valve plate (or valve disc) and the gasket There is still friction between them, which will still lead to wear of the gasket, and its service life is also short. At the same time, there are also defects of low working pressure and poor sealing performance, and the driving force required to close the valve is also large.

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