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Valve rod ultrahigh-pressure sealing mechanism of valve

A sealing mechanism and ultra-high pressure technology, applied in shaft seals, valve details, valve devices, etc., can solve problems such as external leakage and unstable sealing effect, and achieve the effects of prolonging the use time, strengthening the sealing effect, and protecting cleanliness

Pending Publication Date: 2022-03-25
SUZHOU DAWSON DRILLING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the working conditions of the fracturing gate valve are relatively complicated. At present, the maximum sealing pressure of the valve stem seal is 20,000 psi, and the temperature level is PU (-29-121°C). Under the complex working conditions of fracturing, the sealing effect is extremely unstable. After many times, there will be a leaking site

Method used

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  • Valve rod ultrahigh-pressure sealing mechanism of valve
  • Valve rod ultrahigh-pressure sealing mechanism of valve
  • Valve rod ultrahigh-pressure sealing mechanism of valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to Figure 1-4 , a valve stem ultra-high pressure sealing mechanism, including a T-shaped cover 1, two built-in first V-shaped springs 2 and second V-shaped springs 4, a first spring energy storage seal ring housing 3, a second spring Energy storage seal ring housing 5, V-shaped piece 6, V-shaped support ring 7;

[0029] Two first V-shaped springs 2 are arranged between the T-shaped cover 1 and the first spring energy storage sealing ring housing 3, and two second V-shaped springs 4 are arranged between the first spring energy storage sealing ring housing 3 and the second spring energy storage sealing ring housing 3. Between the two spring energy sealing ring housings 5 ​​, the V-shaped piece 6 is arranged between the second spring energy storing sealing ring housing 5 and the V-shaped supporting ring 7 .

[0030] The first spring energy storage seal ring housing 3 is set as the first-level main seal, the second spring energy storage seal ring housing 5 is set as...

Embodiment 2

[0032] The T-shaped cover 1 is circular, and the cross-sectional shape of the T-shaped cover 1 is T-shaped. The T-shaped cover 1 is made of high-rigidity polyethylene terephthalate plastic, polyphenylsulfone or polyetheretherketone.

[0033] The set T-shaped cover 1 ensures that the gap of the valve stem is small, thereby effectively preventing the sediment in crude oil or natural gas from entering the main seal, effectively protecting the cleanliness of the friction surface of the main seal, and extending the ultra-high pressure sealing mechanism of the valve stem. usage time.

[0034] The cross-sectional shape of the first V-shaped spring 2 is V-shaped. The first V-shaped spring 2 is made of Elgiloy alloy. The two first V-shaped springs 2 are symmetrically arranged on one side of the T-shaped cover 1. The first V-shaped spring 2 fits with T-shaped cover 1.

[0035] The first spring energy storage sealing ring housing 3 is made of high rigidity material, the inner and outer ...

Embodiment 3

[0039] The cross-section of the V-shaped piece 6 is V-shaped, and the side of the second spring energy-storage sealing ring housing 5 close to the V-shaped piece 6 fits with the V-shaped piece 6 .

[0040] The second spring energy storage sealing ring housing 5 is made of carbon fiber, and the carbon fiber is filled with tetrafluoroethylene.

[0041] A side of the V-shaped support ring 7 close to the V-shaped piece 6 is provided with a V-shaped groove matching the V-shaped piece 6 for matching the V-shaped piece 6 .

[0042] The pressure of the first spring energy storage sealing ring housing 3 and the second spring energy storage sealing ring housing 5 can be transmitted to the V-shaped piece 6, so that the V-shaped piece 6 is further in contact with the groove and the valve stem, ensuring the ultra-high pressure of the valve stem The sealing effect of the sealing mechanism is further enhanced.

[0043] The V-shaped support ring 7 is made of highly rigid polyethylene terepht...

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Abstract

The ultrahigh-pressure sealing mechanism comprises a T-shaped cover, a first V-shaped spring, a second V-shaped spring, a first spring energy storage sealing ring shell, a second spring energy storage sealing ring shell, a V-shaped piece and a V-shaped supporting ring, wherein the first V-shaped spring and the second V-shaped spring are arranged in the T-shaped cover; the two first V-shaped springs are arranged between the T-shaped cover and the first spring energy storage sealing ring shell, and the two second V-shaped springs are arranged between the first spring energy storage sealing ring shell and the second spring energy storage sealing ring shell. The valve sealing device is suitable for the technical field of valve sealing, the arranged first spring energy storage sealing ring shell serves as a first-stage main seal, the arranged second spring energy storage sealing ring shell serves as a second-stage main seal, the arranged V-shaped piece serves as a third-stage main seal, and the first V-shaped spring and the second V-shaped spring can provide initial elastic force; sealing lips on the inner diameter and the outer diameter of the first-stage main seal and the second-stage main seal can be in tight contact, strong pressure stress is formed, and the sealing effect is enhanced.

Description

technical field [0001] The invention belongs to the technical field of valve sealing, in particular to a valve stem ultra-high pressure sealing mechanism of a valve. Background technique [0002] Fracturing valves are widely used in petroleum and fracturing industries, and are a critical part of fracturing and industry. Therefore, the stem seal of fracturing gate valves is very critical. The traditional seal structure consists of a filled PTFE Vinyl housing, spring as force element and backing ring made of high extrusion resistance material; [0003] At present, the working conditions of the fracturing gate valve are relatively complicated. At present, the maximum sealing pressure of the valve stem seal is 20,000 psi, and the temperature level is PU (-29-121°C). Under the complex working conditions of fracturing, the sealing effect is extremely unstable. After many times, there will be a scene of leakage. Contents of the invention [0004] The purpose of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K41/04
CPCF16K41/04
Inventor 詹良斌张飞董胜袁辉马辉唐慧彭亮
Owner SUZHOU DAWSON DRILLING EQUIP CO LTD