CN207621345U - A kind of sealing device on polyethylene valve tightness detection device - Google Patents
A kind of sealing device on polyethylene valve tightness detection device Download PDFInfo
- Publication number
- CN207621345U CN207621345U CN201721853493.9U CN201721853493U CN207621345U CN 207621345 U CN207621345 U CN 207621345U CN 201721853493 U CN201721853493 U CN 201721853493U CN 207621345 U CN207621345 U CN 207621345U
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- CN
- China
- Prior art keywords
- valve
- gas
- flow closure
- closure circle
- fixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model is related to a kind of sealing devices on polyethylene valve tightness detection device.Concrete composition includes fixture, gas-flow closure circle, valve cock, gas circuit, solenoid directional control valve, air source.Gas-flow closure circle is mounted on the seal groove of fixture inner wall, and there are one the valve cocks that can carry out inflation/deflation, the valve cock to be connected to air source through gas circuit and solenoid directional control valve for dress on gas-flow closure circle.Gas-flow closure circle is filled with compressed air, and sealing ring holds the sealing realized to valve end tightly with valve outer wall.The utility model solves the problems, such as the left and right both ends fixture of valve, and frictional force is excessive between valve outer wall and sealing ring during plugging valve, valve is also avoided simultaneously and bears the problem that axial force causes valve weld seam impaired, improves the reliability of polyethylene valve tightness detection.
Description
Technical field
The utility model is related to a kind of polyethylene valve tightness detection devices, and in particular to one kind being used in polyethylene valve
Sealing device on leak-testing apparatus.
Background technology
According to standard GB/T 15558.3-2008《Combustion gas buried polyethylene (PE) pipe-line system --- third portion：
Valve》Defined mandatory inspection project, needed before the manufacture of polyethylene valve one by one the detection of being sealed property, when detection require valve
Both ends sealed reliable.In existing domestic market, when being detected to being sealed property of polyethylene valve, mostly with reference to metal valve
Pinch seal mode uses end to compress, carry out sealed valve by applying prodigious axial force.This sealing means lead to valve
Axially loaded deformation, especially welded junction part are generated because larger axial force may make intact weld seam by pressure break or defective
Weld seam temporarily pressed, to can not accurately detect the leakage of valve.
In order to reduce harmful effect of the axial force to valve weld seam, O-ring seal is loaded onto in the fixture at valve both ends,
Utilize sealing ring sealed valve both ends.Due to generating friction between sealing ring and valve in relative motion, both aggravated so close
Seal is worn, while sealing ring may be released out of seal groove and can not be sealed by the frictional force generated, finally be influenced close
The detection of envelope property.
Invention content
In order to overcome in the prior art polyethylene valve bear axial force and cause to deposit between weld seam impaired, valve and sealing ring
The frictional force the defects of, the utility model provides a kind of gas-flow closure technology, and air inflation sealing device is utilized to realize valve both ends
Reliable sealing, and then complete the accurate detection of valve tightness.
Technical solution adopted by the utility model to solve its technical problems is：A kind of air inflation sealing device, concrete composition
Including fixture, gas-flow closure circle, valve cock, gas circuit, solenoid directional control valve, air source.There are one can carry out inflation/deflation with dress on sealing ring
Valve cock, which is connected to air source through gas circuit and solenoid directional control valve.
Above-mentioned air inflation sealing device, the gas-flow closure circle are made of natural rubber material, can bear experiment institute
The pressure needed is mounted in the seal groove of fixture inner wall.
The air source of above-mentioned air inflation sealing device, described device is air compressor.
The solenoid directional control valve of above-mentioned air inflation sealing device, described device is three-position four-way electromagnetic directional valve.
The utility model has the beneficial effects that the utility model sealing device by the way of gas-flow closure to valve both ends
It is sealed, has effectively eliminated destruction and conventional seals circle of the both ends axial direction pinch seal mode to valve weld seam
Frictional resistance between sealing means valve and sealing ring.Using gas-flow closure mode, when both ends fixture is with respect to valve motion, card
It is contactless between tool and valve, it is also contactless between gas-flow closure circle and valve, axial force and frictional resistance is not present.
Description of the drawings
Fig. 1 is air inflation sealing device schematic diagram, 1 fixture in figure, 2 gas-flow closure circles, 3 polyethylene valves.
Specific implementation mode
Gas-flow closure circle 2 is placed in (gas-flow closure on the fixture 1 of polyethylene valve tightness detection device by the utility model
Schematic diagram of device only depicts valve left side structure, and right side is symmetrical with left side, without other differences.), when fixture 1 is to poly- second
When alkene valve 3 moves, gas-flow closure circle 2 is non-aerating, and section is in concave state.At this point, polyethylene valve 3 and fixture 1, filling
Airtight seal 2 does not contact.Stop movement after fixture 1 is moved to polyethylene 3 suitable position of valve, at this time to gas-flow closure circle
2 inflations, when air pressure reaches setting value, gas-flow closure circle 2 is in the shape of a " convex ", holds tightly and seals with the outer wall of polyethylene valve 3.
It needs to detach fixture 1 with polyethylene valve 3 after having carried out sealing propertytest, need gas-flow closure circle at this time first
2 exhausts make it restore concave state, finally remove fixture 1.
It is known technology about how three-position four-way electromagnetic directional valve connects valve cock and air compressor machine, the utility model is only
It is to fill exhaust using this three-position four-way electromagnetic directional valve realization gas-flow closure circle.
Claims (1)
1. a kind of sealing device on polyethylene valve tightness detection device, including fixture, gas-flow closure circle, valve
Mouth, gas circuit, solenoid directional control valve, air source fixture inner walls have the seal groove for placing gas-flow closure circle, and valve is installed on gas-flow closure circle
Mouth, valve cock are connected to air source through gas circuit and solenoid directional control valve, and it is in concave that ring cross-section is sealed when non-aerating, is trapped in seal groove
It is interior, it can be freely moved between fixture and valve, section is in the shape of a " convex " after sealing ring inflation, and it is close to hold realization tightly with valve outer wall
Envelope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721853493.9U CN207621345U (en) | 2017-12-13 | 2017-12-13 | A kind of sealing device on polyethylene valve tightness detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721853493.9U CN207621345U (en) | 2017-12-13 | 2017-12-13 | A kind of sealing device on polyethylene valve tightness detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207621345U true CN207621345U (en) | 2018-07-17 |
Family
ID=62830046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721853493.9U Expired - Fee Related CN207621345U (en) | 2017-12-13 | 2017-12-13 | A kind of sealing device on polyethylene valve tightness detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207621345U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836848A (en) * | 2019-11-15 | 2020-02-25 | 眉山中车制动科技股份有限公司 | Method and device for detecting friction force of O-shaped sealing ring |
-
2017
- 2017-12-13 CN CN201721853493.9U patent/CN207621345U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836848A (en) * | 2019-11-15 | 2020-02-25 | 眉山中车制动科技股份有限公司 | Method and device for detecting friction force of O-shaped sealing ring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180717 Termination date: 20201213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |