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Plug valve of seal structure

A sealing structure and plug valve technology, applied in the field of plug valves, can solve the problems of complex manufacturing process, poor sealing performance, poor sealing effect, etc., and achieve the effect of good sealing effect, reasonable structure design and small contact surface.

Active Publication Date: 2013-07-10
ZHEJIANG WANLONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plug valve is protected by two sealing devices. The first one is fixed on the plug valve by inlaying or pressing process. The manufacturing process is complicated and increases the cost. The second one is only a simple layer of annular sealing ring, which has a simple structure and poor sealing performance. , the sealing effect is poor

Method used

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0022] see Figure 1 to Figure 4 , This embodiment includes a valve body 1, a valve cover 2, a bolt 3, a cock rod 4, a pressure plate 5, a gasket 6, a valve seat 7, a sealing ring 8 and a pressure sleeve 9.

[0023] The valve seat 7 of this embodiment is fixed in the valve body 1, the valve cover 2 is located on the valve body 1 and fixed with the valve body 1, the pressure plate 5 is located in the valve cover 2 and is arranged on the valve seat 7, and the cock rod 4 passes through The valve cover 2 and the pressure plate 5 are connected to the valve seat 7; the pressure sleeve 9 is arranged on the outer surface of the cock rod 4, one end of which extends under the pressure plate 5, the bottom of the pressure sleev...

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Abstract

The invention relates to a plug valve of a seal structure. The plug valve comprises a valve body, a valve cover, a plug rod, a pressing plate and a valve seat and is characterized by further comprising a pressing sleeve, a seal pad and a seal cup. The pressing sleeve is disposed on the outer surface of the plug rod. One end of the pressing sleeve extends to a position below the pressing plate. The bottom of the pressing sleeve is tightly pressed by the pressing plate. The middle of the pressing sleeve is tightly pressed by the valve cover and the pressing plate. The seal pad is disposed on the valve body. The excircle of the seal pad is located between the valve body and the valve cover and tightly pressed by the two. An inner circle of the seal pad is closely butted against the root of the plug rod and tightly pressed by the pressing sleeve. The seal cup is disposed on the plug rod, located between the pressing sleeve and the plug rod, and comprises an O-shaped ring and a PTFE (polytetrafluoroethylene) cup which are disposed on the plug rod, wherein the PTFE cup is located on the O-shaped ring. The plug valve is simple in structure, reasonable in design, convenient to use, reliable in seal performance and good in seal effect. contact face between the seal cup and the plug rod is low, and valve opening and closing torque is low.

Description

technical field [0001] The invention relates to a plug valve, in particular to a plug valve with a sealing structure, which is mainly suitable for fluid pipelines. Background technique [0002] The plug valves in the prior art are generally only provided with a sealing device at the connection between the plug rod and the valve body. The sealing device is pressed and fixed by the valve body and the valve cover. The sealing reliability is poor and the sealing effect is not good, which will cause the fluid in the cavity to leak. affect other devices. [0003] Existing foreign plug valves generally consist of a valve body, a plug rod, a valve cover, a valve seat, and a gasket. The inner circle part is pressed against the root of the pressure plate and the cock rod, which is a dynamic seal, but its sealing effect is not ideal. The above-mentioned sealing structure and materials used have poor sealing reliability and poor sealing effect. [0004] The Chinese patent application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/08
Inventor 程兴炎
Owner ZHEJIANG WANLONG MACHINERY
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