Double block and bleed pressure balance type inverted plug valve

A balanced plug valve technology, which is applied in the direction of plugs including cut-off devices, valve devices, engine components, etc., can solve the problems of low valve safety, difficult release of medium pressure, easy wear of sealing slides, etc., to avoid High temperature jamming phenomenon, reducing opening torque, and protecting the effect of sealing surface

Inactive Publication Date: 2014-04-09
WOTAI VALVE KUSN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantages of the valve with this structure are that the cock is easily stuck, the sealing slide is easy to wear, the maintenance is inconvenient, and the service life is short. Moreover, the safety of this valve is not high. When the seal at one end is damaged, the pressure of the leaked medium is difficult to release.

Method used

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  • Double block and bleed pressure balance type inverted plug valve
  • Double block and bleed pressure balance type inverted plug valve
  • Double block and bleed pressure balance type inverted plug valve

Examples

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Embodiment

[0046] Embodiment: please refer to the accompanying drawings, and the present invention will be further elaborated.

[0047] Such as figure 1 , figure 2 and image 3 As shown, the present invention provides a double-close and double-break pressure-balanced inverted plug valve with reliable sealing and preventing the plug from being stuck. It includes valve body 1, valve stem 2, butterfly spring 3, cross connector 4, cock 5, oil filling valve 6, second check valve 7, packing 8, valve cover 9, ball 10, sealing diaphragm 11, adjustment Shaft 12, adjusting shaft gland 13, second check valve 14 and other important parts. According to the form of the cock flow hole, it can be divided into conventional straight type or Venturi type. There are many types of materials for the valve body and internal parts, a wide range of applications, and suitable for various media. The cock of the present invention is an inverted tapered valve plug whose one end connected to the valve stem is sma...

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PUM

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Abstract

The invention discloses a double block and bleed pressure balance type inverted plug valve which comprises a valve body, plug cocks, valve rods and filler. The plug cocks are arranged in the inner cavity of the valve body, the valve rods drive the plug cocks to rotate, the sealing faces of the plug cocks are conical surfaces, one valve body is arranged, the two plug cocks are connected in series, a safety relief valve is arranged in a valve body middle cavity between the two plug cocks, the plug cocks are inverted conical valve plugs, the ends, connected with the valve rods, of the conical valve plugs are smaller than the other ends of the conical valve plugs, the valve rods are connected with the plug cocks through cross connectors, cylindrical springs or belleville springs are arranged between the valve rods and the plug cocks, valve covers are fixed to the lower end of the valve body, an adjusting shaft is arranged on each valve cover, the lower ends of the adjusting shafts stretch out of the valve covers, and the upper ends of the adjusting shafts abut against the plug cocks. The double block and bleed pressure balance type inverted plug valve has the DBB function, can be used at high temperature and high pressure and under severe working conditions, and has the advantages of being reliable in sealing, small in operating torque, long in service life and the like.

Description

technical field [0001] The invention belongs to the technical field of valve manufacturing, and in particular relates to a double-close and double-break pressure-balanced inverted plug valve, which is used for the control of gas and liquid delivery pipelines. Background technique [0002] At present, the plug valves used in China are mainly soft-sealed, small-caliber, and low-pressure, which cannot solve the application of plug valves under high temperature, high pressure, and severe working conditions. High-end plug valve products mainly rely on imports. Because the plug valve is very easy to cause wear on the sealing surface during the opening and closing process, so that serious problems such as valve leakage and plug jamming are caused. Therefore, the machining accuracy and matching accuracy required for the plug and valve body sealing surface of the plug valve are very high. In addition, API (American Petroleum Institute, American Petroleum Institute) requires pipeline...

Claims

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Application Information

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IPC IPC(8): F16K13/00
CPCF16K13/00F16K5/025F16K5/0278
Inventor 张秀坤
Owner WOTAI VALVE KUSN
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