A dust-proof butterfly valve with high sealing performance

Abstract

The invention discloses a high-sealability dust-proof butterfly valve which comprises a fixed link, a dust-proof ring, a bottom cover, an oil storage tank, an upper shaft sleeve, a middle shaft sleeve, a lower shaft sleeve, a first dust-proof shield piece, a second dust-proof shield piece, a filler, a dust-proof pad and a seal sleeve, wherein a valve stem enters the inner cavity of a valve body through the fixed link; the gap between the valve stem and valve body is provided with the upper shaft sleeve, middle shaft sleeve and lower shaft sleeve; a valve seat and the valve body are mutually assembled and connected; the bottom cover is arranged below the valve body; the bottom of the upper shaft sleeve is connected with the first dust-proof shield piece, and the top is connected with the second dust-proof shield piece; the filler is closely attached to the upper part of the second dust-proof shield piece; the oil storage tank is arranged between the first dust-proof shield piece and fixed link; the dust-proof ring is arranged on the bottom of the middle shaft sleeve and the top of the lower shaft sleeve; the dust-proof pad is arranged on the bottom of the lower shaft sleeve; and the seal sleeve is arranged on the bottom of the valve stem. The butterfly valve has the advantages of favorable overall sealing effect, high dust-proof capacity under high-temperature conditions, small internal friction damage and low working noise, and can adopt multiple drive modes.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a dust-proof butterfly valve with high sealing performance. Background technique [0002] Butterfly valve is a regulating valve with simple structure, which is mainly used in the switch control of low-pressure pipeline medium. The valve plate of the closing part is a disc, which rotates around the valve shaft to achieve opening and closing. It can be used to control air, water, steam, mud, The flow butterfly valve of various types of fluids such as oil, liquid metal and radioactive medium is mainly used for cutting and throttling. It is widely used in various industries and has become one of the most common valves on the market. However, because most butterfly valves are in dusty and high-temperature working environments, and the medium circulating inside the butterfly valve is highly pressured and mostly corrosive, the internal structure of the butterfly valve is easily corroded,...

AI Technical Summary

Problems solved by technology

However, because most butterfly valves are in dusty and high-temperature working environments, and the medium circulating inside the butterfly valve is highly pressured and mostly corrosive, the internal structure of the butterfly valve is easily corroded, and dust or impurities can easily enter the gap between the valve stem and the valve body. In the middle, the shaft and the bearing are stuck, so that it cannot work normally, which affects the work efficiency and greatly reduces the service life of the butterfly valve; the butterfly valve of the prior art generally only relies on the dust-proof ring formed by rubber to prevent the dust and impurities in the medium from entering Between the valve stem and the valve body, the protection to the outside world is relatively weak, and after a long-term use of the butterfly valve, due to the long-term friction between the valve stem and the rubber, coupled with the thermal expansion and contraction of the high-temperature medium, its airtightness is greatly reduced. , the dust-proof effect is average; in addition, the gap between the valve stem and the valve body of the existing butterfly valve will seriously affect the sealing performance of the butterfly valve, but the tight nesting of the two will cause the friction of the valve stem to be too large, and the valve stem is difficult to rotate. Even the valve stem is stuck; when the butterfly valve is working, it is often noisy, which affects the normal work of the staff

Images