Double-plate double-valve-seat bi-directional metal-sealed butterfly valve

Abstract

The invention relates to a double-plate double-valve-seat bi-directional metal-sealed butterfly valve, which comprises a drive device, a support, a filler, a filler gland, a bottom cover, a valve body, a butterfly plate, an upper valve shaft, a lower valve shaft, a valve shaft pin, valve seats, a butterfly plate metal seal ring, a pressing plate, a valve seat pressing plate, a check ring and an adjustable valve seat seal ring. The valve seats are oppositely arranged between a disk and the valve body at two sides of the upper valve shaft; the valve seats are oppositely arranged between the disk and the valve body at two sides of the lower valve shaft; and the valve seats are fixed valve seat and / or adjustable valve seats. The butterfly valve has a scientific and reasonable structure design, a simple structure, easiness in processing and manufacturing, large caliber, high flow capacity, high pressure resistance, high temperature resistance, corrosion resistance, diversion stability, small vibration, low noise, long service life, and capability of on-line overhauling and replacing a sealing element, and a double-sealed pair works cooperatively or independently when at a two-way alternative pressure-bearing state so as to further realize two-way sealing.

Description

technical field [0001] The invention belongs to the technical field of valve equipment, in particular to a double-plate two-way metal-sealed butterfly valve. Background technique [0002] The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. There are various types of industrial valves, which are widely used in petrochemical, food, pharmaceutical, water, electricity and other industries, and mainly play the role of flow regulation and cut-off of fluid m...

AI Technical Summary

Problems solved by technology

The common feature of these butterfly valves is that they are not resistant to high temperature environments, or cannot withstand the action of high-pressure media, or the two-way sealing function is unreliable, that is, they cannot achieve two-way sealing under the same pressure level; some have asymmetrical structural forms in the sealing mechanism , so that the two-way sealing function cannot meet the requirements of balance and consistency

The metal seal butterfly valve with follow-up valve seat structure also has the hidden danger of follow-up failure, that is, the phenomenon that the movement of the valve seat is often blocked with the prolongation of use time in engineering use

In terms of processing and manufacturing, the main parts of some metal sealing butterfly valves are difficult to process, and there are still shortcomings that cannot be interchanged.

In short, under the conditions of high temperature, high pressure, strong corrosive medium and severe erosion, the sealing performance of the butterfly valve in the prior art is damaged, causing medium leakage, reducing or failing the valve performance, and making high parameters (large diameter, high pressure, etc.) Pressure, high temperature resistance, high flow capacity, two-way sealing) butterfly valve, especially the design, manufacture and engineering application of the two-way metal sealing sub-butterfly valve are greatly restricted

[0004] Through searching, no patent publications related to this patent application have been found

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