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Three-eccentric and bidirectional metal sealing butterfly valve

A metal seal, triple eccentric technology, applied in the direction of valve lift, valve details, valve device, etc., can solve problems such as stuck, valve stuck, seal failure, etc., to increase elastic deformation, reduce friction coefficient, increase structural strength Effect

Active Publication Date: 2015-02-04
WUXI YADI FLUID CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Triple eccentric butterfly valve is a commonly used valve equipment. At present, most of the domestically produced triple eccentric butterfly valves are realized by the multi-layer sealing ring structure of flexible graphite and metal sheet. Most manufacturers use it, but this kind of multi-layer sealing ring also has great disadvantages. It is difficult to use it at high temperature, especially when the temperature exceeds 450 degrees. In addition, flexible graphite is easily damaged under the impact of high-pressure medium. Thus making the seal invalid; moreover, the flexible graphite is dynamically sealed in the medium containing water vapor for a long time, and the service life is very short
However, imported products are expensive, and there will be jamming and leakage at high temperatures, so many domestic users have strong expectations that they can buy domestically replaced imported products
[0004] In addition, in the existing technology, the sealing rings in the domestic and foreign triple eccentric butterfly valves are basically placed on the valve plate, the valve seat and the valve body are integrated design, and the valve body is surfacing with hard alloy. The disadvantage is that once the surfacing welding sealing surface is damaged, it is difficult to repair and the interchangeability is poor
Facing the application in high temperature occasions, most foreign manufacturers meet the thermal expansion requirements by selecting the connection structure of the upper key and the lower pin, as well as appropriate material ratio and treatment, but there is no experience in this area in China, so the domestic triple eccentric butterfly valve is very difficult. It is difficult to meet the requirements of high temperature use, and it is easy to cause the valve to be stuck at high temperature
For the adjustment of high pressure difference, due to the large dynamic torque phenomenon, usually rely on increasing the size of the actuator to meet the adjustment requirements under high pressure difference, which will increase the overall cost of the valve

Method used

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0032] As shown in the figure: the three-eccentric two-way metal-sealed butterfly valve in the embodiment mainly consists of a valve body 1, a valve plate 2, a valve stem 3, a sealing ring 4, a valve seat 5, a valve seat gasket ring 6, a valve seat retainer ring 7, The first bearing backing ring 8, the first bearing 9, the packing gasket 10, the packing 11, the packing gland 12, the packing gland 13, the stud 14, the hex nut 15, the valve seat sealing washer 16, the key 17, the pin 18. Limiting semi-circular ring 19, thrust pad 20, gasket 21, second bearing backing ring 22, second bearing 23, limiting plate 24, limiting screw 25, hex head bolt 26, spring washer 27, bottom Cover 28, bottom cover gasket 29, second screw 30, seal ring seal washer 31, first screw 32, seal ring pressure ring 33 and so on.

[0033] Such as figure 1 As shown, the valve body 1 is pr...

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PUM

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Abstract

The invention relates to a three-eccentric and bidirectional metal sealing butterfly valve. A flow passage is arranged in a valve body, a valve seat is sealed and fixedly arranged on the inner wall of the flow passage, a valve rod is vertically arranged and penetrates through the flow passage, the upper end of the valve rod and the valve body are sealed and connected by a first rotary type sealing and connecting structure, the lower end of the valve rod and the valve body are sealed and connected by a second rotary type sealing and connecting structure, a valve plate is arranged in the flow passage and is fixedly arranged on the valve rod, a mounting step is arranged at the periphery of the valve plate, a sealing ring is arranged on the mounting step and is pressed and fixed by a sealing ring press ring, the sealing ring press ring is fixedly connected with the valve plate by a first screw, and the sealing ring is in fit with the valve seat, so as to control the opening or closing of the valve. The three-eccentric and bidirectional metal sealing butterfly valve is characterized in that virtual gaps are respectively arranged between the inside surface of the sealing ring and the mounting step surface as well as between the outside surface of the sealing ring and the pressing surface of the sealing ring press ring, and sealing ring sealing gaskets are arranged in the virtual gaps. The three-eccentric and bidirectional metal sealing butterfly valve has the advantages that the structure design is novel, the requirement of stricter working condition is well met, the whole cost is reduced, and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to a triple eccentric bidirectional metal sealing butterfly valve, which belongs to the technical field of valve processing and manufacturing. Background technique [0002] Triple eccentric butterfly valve is a commonly used valve equipment. At present, most of the domestically produced triple eccentric butterfly valves are realized by the multi-layer sealing ring structure of flexible graphite and metal sheet. Most manufacturers use it, but this kind of multi-layer sealing ring also has great disadvantages. It is difficult to use it at high temperature, especially when the temperature exceeds 450 degrees. In addition, flexible graphite is easily damaged under the impact of high-pressure medium. Therefore, the seal is invalid; moreover, the flexible graphite is dynamically sealed in a medium containing water vapor for a long time, and the service life is very short. Therefore, domestically produced triple eccentric butterfly valv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/226F16K1/22F16K1/46F16K27/02F16K47/02
CPCF16K1/22F16K1/2261F16K1/46F16K27/02
Inventor 苗同立常萍邓嘉宏李定云缪栖涯
Owner WUXI YADI FLUID CONTROL TECH CO LTD
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