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Valve rod sealing structure

A sealing structure and valve stem technology, applied in shaft seals, valve details, valve devices, etc., can solve problems such as leakage, achieve good compatibility, avoid medium leakage, and improve safety and reliability.

Pending Publication Date: 2021-11-12
DHV VALVE & FOUNDRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some special working conditions, it is necessary to use V-shaped packing to seal the valve stem and bonnet. V-shaped packing is a self-sealing packing that relies on medium force to achieve self-sealing. The greater the pressure, the better the sealing effect, but for low-pressure valves , often presents leakage problems

Method used

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  • Valve rod sealing structure
  • Valve rod sealing structure
  • Valve rod sealing structure

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Embodiment Construction

[0020] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0021] Conventionally, the valve that uses V-shaped packing 3 as the stem seal is suitable for use under high-pressure conditions. V-shaped packing 3 is affected by the medium force. The greater the medium force, the better the sealing effect. If the medium force in the valve is lower than the normal level, then It will cause the seal to fail, and then there will be media leakage problems. The invention improves the sealing in the stuffing box hole, and provides sealing remedial measures while satisfying the high and low pressure sealing, so as to enhance the reliability and safety of the valve stem sealing. The specific structure is as follows:

[0022] This...

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Abstract

The invention relates to a valve rod sealing structure. The valve rod sealing structure comprises a valve cover and a valve rod; the valve rod is arranged in a stuffing box hole of the valve cover in a partially penetrating mode; an elasticity assembly, V-shaped stuffing and a pressing sleeve are sequentially arranged between the valve rod and the stuffing box hole from bottom to top; the extension direction of the elasticity assembly is consistent with the axis direction of the valve rod; a leak detection and blocking assembly is arranged at the bottom of the pressing sleeve; and a pre-tightening assembly connected with the valve cover is arranged at the top of the pressing sleeve. The valve rod sealing structure can meet the sealing requirements under high-pressure and low-pressure working conditions and is good in compatibility; and whether sealing of the valve rod fails or not can be detected, blocking measures are provided for temporary sealing, medium leakage is avoided, and the using safety and reliability of a valve are improved.

Description

technical field [0001] The invention relates to the field of gate valves, in particular to a valve stem sealing structure. Background technique [0002] As a valve for controlling the on-off of pipelines, gate valves are widely used in various fields due to their advantages such as small flow resistance and good sealing performance. For some special working conditions, it is necessary to use V-shaped packing to seal the valve stem and bonnet. V-shaped packing is a self-sealing packing that relies on medium force to achieve self-sealing. The greater the pressure, the better the sealing effect, but for low-pressure valves , tends to have leakage problems. Contents of the invention [0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, provide a valve stem sealing structure, so that the V-shaped packing can also effectively seal under low pressure. [0004] In order to achieve the above-mentioned tech...

Claims

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Application Information

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IPC IPC(8): F16K41/06F16K41/02F16K37/00
CPCF16K41/06F16K41/02F16K37/00
Inventor 韩泽海
Owner DHV VALVE & FOUNDRY
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