Spherical butterfly valve

Abstract

The invention provides a spherical butterfly valve. The spherical butterfly valve comprises a driving device, a valve body, a valve shaft, a valve seat and a valve plate; a cavity used for containingthe valve plate is formed in the valve body, the valve plate is movably arranged in the cavity, the valve shaft is eccentrically connected with the valve plate, a step used for mounting the valve seatis arranged on the inner wall of the cavity, the valve seat is arranged on the step in a sealed mode, the valve plate and the valve seat form a dynamic sealing pair, and a valve seat pressing ring and a valve seat pressing ring baffle ring are arranged on the inner wall of the cavity; a compensation gap is left between the valve seat and the valve seat pressing ring; and a pre-fastening screw used for jacking and pressing the valve seat is arranged on the valve seat pressing ring, and the bottom end of the pre-fastening screw abuts against the valve seat. The spherical butterfly valve is compact in structure and easy to machine, and meanwhile has the advantages that the valve is convenient to mount and maintain, the sealing property is good, the reliability is high, online repairing can be conducted, and aboveground operation can be conducted conveniently.

Description

technical field [0001] The invention relates to a valve, in particular to a spherical butterfly valve. Background technique [0002] The spherical butterfly valve is a valve with a butterfly valve structure and a spherical sealing pair, that is, the sealing surface of the valve plate is a spherical surface, and the sealing surface of the valve seat is a conical surface. The spherical butterfly valve is a double eccentric structure, using the principle of sealing pair wedge, when the valve is closed, it can cut off the dirt or dirt deposited on the sealing surface of the valve plate, so as to ensure the cleaning of the sealing surface. The spherical butterfly valve currently used in the market is mainly composed of main parts such as valve body, valve seat pressure ring, valve seat, valve plate, valve seat sealing ring, upper and lower valve shafts. The seal between the valve seat and the valve body mainly has two forms: end face seal and radial seal. The radial seal can rea...

AI Technical Summary

Problems solved by technology

The valve seat pressure ring is a flange structure. In order to ensure the reasonable design of the valve body structure and size, the valve seat pressure ring must be designed with a reduced diameter, otherwise the wall thickness of the valve body will be partially uneven, resulting in casting defects in the design. Due to the reduced diameter design of this structure, the flow capacity of the valve will be reduced. For the water system, this structure will affect the medium parameters of the downstream process system on site

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