CN101858817A - Equal-pressure virtual isolation check valve sealing test method and equipment - Google Patents

Equal-pressure virtual isolation check valve sealing test method and equipment Download PDF

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Publication number
CN101858817A
CN101858817A CN 201010196514 CN201010196514A CN101858817A CN 101858817 A CN101858817 A CN 101858817A CN 201010196514 CN201010196514 CN 201010196514 CN 201010196514 A CN201010196514 A CN 201010196514A CN 101858817 A CN101858817 A CN 101858817A
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pressure
valve
test
equal
tested
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CN 201010196514
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Chinese (zh)
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CN101858817B (en
Inventor
蒋坚毅
王煊
郭红晓
李安明
秦传豪
孙颢
房厦
周文权
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北京冶核技术发展有限责任公司
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Abstract

The invention relates to equal-pressure virtual isolation check valve sealing test method and equipment, which are realized through an equal-pressure virtual isolation sealing plug and a leak detector by the following steps of: firstly arranging the equal-pressure virtual isolation sealing plug in an outlet pipe of a tested check valve; filling pressure in the sealing ring and the annular space of the sealing plug through the test fluid of the leak detector, and carrying out virtual isolation on the outlet pipe of the tested check valve through a formed equal-pressure ring; then carrying out fluid filling on a cavity between the equal-pressure virtual isolation sealing plug and a valve plate in the tested check valve through the leak detector, and keeping the pressure in the cavity of the tested check valve to be constant; and subsequently detecting the supplemented flow value of the fluid, i.e. the leakage ratio of the valve, wherein the test fluid not only can be gas, but also can be a liquid. The invention has the characteristics of accurate and reliable testing result, short working time of testing personnel in a high-dose region, low acceptable dose and less time for installing an equal-pressure isolation plug body 1. A low-pressure sealing test is adopted for test pressure, and the test pressure is generally consistent with the test pressure of a nuclear power plant containment.

Description

Equal-pressure virtual isolation check valve sealing test method and equipment

Technical field

The invention belongs to detection technique, relate to a kind of equal-pressure virtual isolation check valve sealing test method and realize the experimental facilities of this method, be applicable to the valve seal test, be particularly suitable for being installed in the impermeability test of the non-return valve in nuclear power plant's process system with welding manner.

Background technology

On stand, carry out the existing proven technique of impermeability test of non-return valve, but the check valve sealing test that is installed in the process system there are certain difficulty and defective:

1, the ice berg shutoff is isolated: carry out impermeability test after the non-return valve outlet conduit is with the ice berg shutoff, its shortcoming is the process more complicated, and work efficiency is low, also may damage tested valve body.

2, the interim shutoff of mechanical seal plug is isolated: will test sealing-plug is fixed on non-return valve outlet conduit and body cavity with support and pull bar adjacent.In order to improve sealing, useful fashion of extrusion is installed double density seal or inflatable list O-ring seal at the outer peripheral face of test sealing-plug, and this test sealing-plug all is by the overlapping combination of double-deck cock body, and interconnects with screw and to form.Its shortcoming is: the structure more complicated, and, difficulty is installed because the interior space of valve body is little, it is more to take time, and should not use in the higher occasion of radioactive dosage.

Because the test sealing is plugged with constant weight, its underpart and inner-walls of duct sealing are better, and top then slit is big, leaks easily, very causes and causes O-ring seal top to break; Valve export pipe and process pipe inwall often have rough phenomenon owing to many reasons such as processing, welding, fluid scouring, corrosion cause rough surface, out-of-flatness, smooth.Therefore, be difficult to isolate completely, the non-return valve outlet conduit isolated the sealing that could accurately test out valve completely and have only with conventional methods such as machinery or soft seals.So the test method that the interim shutoff of this mechanical seal plug is isolated can not draw the seal parameters of valve exactly.

3, with water be test(ing) medium, the shortcoming of carrying out the impermeability test of valve with the pressure descent method is can not be quantitative.

Summary of the invention

The purpose of this invention is to provide a kind of convenience and fast, accurately measure test method and the equipment that is installed in the non-return valve on the process system, solve the above-mentioned variety of issue that prior art exists.

Technical scheme of the present invention is:

A kind of equal-pressure virtual isolation check valve sealing test method is characterized in that: equal-pressure virtual isolating seal plug at first is installed in the outlet of tested non-return valve, is promptly isolated between two gas-flow closure circles of outer peripheral face of cock body forming an annular space one; Use the test fluid of leak locator to pressurising in the cavity of annular space, gas-flow closure circle and the tested non-return valve of sealing plug then, pressure in the cavity of pressure and tested non-return valve in this annular space is kept equated, the outlet of tested non-return valve is carried out virtual isolation with the constant wall pressure ring of annular space formation; Detect pressure and the isobaric required additional fluid flow value of constant wall pressure ring kept in this tested non-return valve cavity at last, be the slip of valve; Described test fluid is the also available liquid of available gas both.

A kind of testing equipment of realizing the described method of claim 1 is characterized in that: comprise equal-pressure virtual barrier assembly (S) and leak locator (D):

The virtual isolation group of this equipressure (S) part comprises: the annular space (2) between cock body (1), two O-ring seals (9), pull bar (3), carriage (4), nut (5), location jackscrew (8), two gas-flow closure circles (9), O-ring seal admission piece (A1) and annular space admission piece (B1), in two parallel annular grooves of the outer peripheral face of cock body (1), an O-ring seal (9) is housed respectively, cock body (1) periphery several with location jackscrews (8) and tested valve outlet inwall location; The inboard center of cock body (1) is connected with an end of axial pull bar (3), and the other end of this pull bar (3) is connected with the central authorities of carriage (4) by nut (5), and the edge of this carriage (4) rests on the reducer between tested valve outlet and the body cavity;

This leak locator (D) has following three tunnel inputs, shared same source of the gas:

The first via is made up of the variable valve (K1), multirange flowmeter (Q1), tensimeter (P1) and the stop valve (K2) that connect successively, the output terminal of (K2) even connects the And pressurising with the valve pocket of pipeline and tested valve during test, measure the slip of this tested valve with the flow replenishment, test pressure is identical with the containment test pressure; When test fluid is used liquid, between variable valve (K1) and multirange flowmeter (Q1), add packaging container (V1);

The variable valve that secondary route connects successively (K3), flowmeter (Q2), tensimeter (P2) and stop valve (K4) are formed, during test, the output terminal of stop valve (K4) even connects the And pressurising with the annular space between the double density seal of pipeline and sealing-plug periphery, when the pressure in this compression ring when test pressure in the valve pocket equates, then constitute equal-pressure virtual isolating seal ring; When test fluid is used liquid, between variable valve (K3) and flowmeter (Q2), add packaging container (V2);

Third Road is made up of the variable valve (K5), tensimeter (P3) and the stop valve (K6) that connect successively, and with pipeline and the Lian And pressurising Xiang of described O-ring seal, this pressure is greater than the valve seal test pressure during test.

Described cock body (1) is made of with goblet along two of outer peripheral face parallel grooves uniform 8 positioning screw holes radially of outer peripheral face, the individual inflated rubber formula O-ring seal (9) of putting in this groove, constituted described annular space (2) between the tube wall of two O-ring seals (9) and cock body (1) and described outlet, when the pressure in this annular space (2) when being equated by the pressure in the test valve body chamber, the endoceliac fluid of valve is can not leak by isobaric isolating seal plug, thereby has constituted the effect that equal-pressure virtual is isolated.

When described cock body (1) was installed, the height according to 8 nail silks of outlet internal diameter adjustment made close cock body (1) and outlet concentric, to evenly expanding, were convenient to isolating seal all around during the O-ring seal inflation.

Take technique scheme, utilization forms an isobaric shading ring to the annular space inflation of isobaric barrier assembly for the cavity of testing valve, because the cavity air pressure equipressure of annular space and valve, make the interior gas of cavity of valve can not leak from virtual batching pig, realize virtual thorough isolation, and the interior air-flow that air pressure charged into of cavity of keeping the test valve is the slip of test valve, and measurement result accurately and reliably; Because it is simple in structure, volume is little, the location jackscrew of isobaric barrier assembly can be regulated outdoors at tested valve, so the installation in tested valve is very convenient, the fast aeration joint that only needs to connect test ring shape space and two gas-flow closure circles can be finished, it is short in the time of high dose area work to test personnel, and acceptable dose is low.Test(ing) medium adopts gas, and test pressure adopts the low pressure seal test, and is consistent with the test pressure of npp safety shell usually.Because test pressure is low, the instrument and equipment of test in light weight, volume is little, be easy to carry to carry out execute-in-place and use.

Description of drawings

Fig. 1 is a structural representation of realizing the test unit of equal-pressure virtual isolation check valve leakage test method.

Description of reference numerals: 1, cock body, 2, annular space, 3, pull bar, 4, carriage, 5, nut, 6, valve body, 7, valve plate, 8, the location jackscrew, 9, O-ring seal, 10, valve gap, 11, valve (advancing) outlet, D, leak locator, G, tested non-return valve, S, isobaric barrier assembly.

Embodiment

Among Fig. 1, left-half is leak locator D, and right half part is and the isobaric barrier assembly S that realizes that equal-pressure virtual is isolated.

The shared same source of the gas of leak locator D has three tunnel inputs:

The first via is made up of variable valve K1, container V1, multirange flowmeter Q1, tensimeter P1 and stop valve K2.Use for pressurising in the valve cavity and survey slip;

Secondary route variable valve K3, container V2, flowmeter Q2, tensimeter P2 and stop valve K4 form.Use for space 2 pressurisings between the double density seal 9 and mensuration slip;

Third Road is made up of variable valve K5, tensimeter P3 and stop valve K6.Be used for to the O-ring seal pressurising.

Underproof check valve G: by valve body 6, valve plate 7, valve gap 10, valve import and export pipe 11, and three tests that are located on the valve gap 10 connect mouth A (the O-ring seal inflation connects mouth), B (annular space 2 inflations connect mouth), C (tested valve cavity inflation connects mouth) formation.

Isobaric barrier assembly S comprises: the annular space 2 between cock body 1, two O-ring seals 9, pull bar 3, carriage 4, nut 5, location jackscrew 8, two gas-flow closure circles 9, O-ring seal admission piece A1 and annular space admission piece B1.O-ring seal admission piece A1 and annular space admission piece B1 all adopt existing quick plug.

The embodiment design parameter is as follows:

The measurement range error

Q1 0-0.5/20?L/min 3%mv(1-100%)

0.03%FS(<1%FS)

Q2 0-0.5?L/min 3%mv(2.5-100%)

0.075%FS(<2.5%FS)

P1 0-600 kpa?min 0.2%FS

P2 0-600 kpa 0.2%FS

P3 0-1000 kpa 0.2%FS

Isobaric cock body 1 diameter 165mm, the thickness 70mm of isolating.

It is as follows that the present invention specifically measures process:

Open valve gap 10, cleaning valve G imports and exports pipe 11 inwalls and valve plate 7 and sealing surface, measures this outlet 11 internal diameters, adjusts the location jackscrew 8 on the cock body 1, connect flexible pipe connecing on mouth A1 and the B1, cock body 1 is put into outlet 11, make cock body 1 and outlet 11 concentrics, load onto pull bar 3 and carriage 4, last jack panel 5, the flexible pipe that connects on the mouth A1 is connected to A, and the flexible pipe that connects on the mouth B1 is connected to B, installs the valve gap 10 that meets mouth A, B, C is housed.Connect leak locator D to the flexible pipe between the valve G: K2 to C, K4 to B, K6 to A.

Open K6, K5 is pressurized to 400kpa to O-ring seal by variable valve.

Open K4,, regulate K3, make pressure P 2 stable remaining on about 230kpa by annular space 2 pressurisings of variable valve K3 between two O-ring seals.

Open K2,, regulate K2, make the pressure P 1 stable 230kpa that remains on by variable valve K1 pressurising in the cavity of valve G.

Adjust K3, make P2 follow the tracks of P1, treat P1, P2, Q1 all stablize constant after, Q1 is the slip of valve.

The formation of constant wall pressure ring is by cup-shaped cup-shaped cock body 1 circumferential arrangement two grooves to be arranged, and respectively puts into an inflatable rubber seal 9 in the groove, and thickening projection in cup-shaped cock body 1 bottom center and screw rod (pull bar 3) junction increases tensile strength.Inflation to O-ring seal 9 is to realize by the stop valve K6 that meets mouth A1, A and flexible pipe and leak locator D.Open stop valve K6 and inflate pressurization simultaneously to two O-ring seals 9, its pressure is shown that by tensimeter P3 the pressure size is by variable valve K5 control, and this pressure should be greater than the test pressure of valve.Pressurising to annular space 2 is to finish by the stop valve K4 that connects mouth B1, B and flexible pipe and leak locator.Adjust variable valve K3, when making tensimeter P3 stablize to test pressure, flowmeter Q2 displayed value is the leakage rate of annular space 2, and so value is zero, and the good sealing effect of O-ring seal is described; But this value of most cases is non-vanishing, this flow value might flow in valve cavity, if the interior pressure of pressure and valve pocket in the annular space 2 is equated, then there is not fluid to flow between annular space 2 and the valve pocket, the pressurising fluid of annular space has become invisible sealing ring, the principle of equal-pressure virtual isolation of the present invention that Here it is.Isolation of the present invention is not the direct shutoff of object by ice berg, sealing-plug and so on, isolates but use the isobaric fluid ring that is processed into cup-shaped cock body and O-ring seal formation.Though all be buffer action, essential distinction is arranged from the principle of isolating.

Be installed in the pipeline for solving cock body 1, because of cock body has weight, lower seal is good, and the slit, top is big, the problem that causes leakage and O-ring seal to break easily, outer peripheral face at cock body 1 respectively is evenly equipped with 4 location jackscrews 8 radially near the place, two ends, adjust the height of jackscrew 8, can make cock body 1 identical, so just equated with the spacing of tube wall around the cock body 1 with the axle center of valve export pipe 11, therefore, O-ring seal 9 upper gap cause the problem of leaking consequently breakage also just to be readily solved greatly.Therefore valve export pipe 11 and internal diameter of the pipeline and nominal diameter all have certain tolerance, must measure bore before adjusting location jackscrew 8 height of cock body 1.

Test(ing) medium adopts gas usually, and also available liquid is according to the test condition confirmed test medium at scene, so this law has stronger adaptability.If when doing leakage test, be decorated with pack into the liquid of this test(ing) medium of the container V1 of dotted line and V2 planted agent among the figure, Q1 and Q2 liquid flowmeter with liquid; When using gas test, then without container V1, V2, Q1, Q2 are gas meters.

Claims (4)

1. equal-pressure virtual isolation check valve sealing test method is characterized in that: equal-pressure virtual isolating seal plug at first is installed in the outlet of tested non-return valve, is promptly isolated between two gas-flow closure circles of outer peripheral face of cock body forming an annular space one; Use the test fluid of leak locator to pressurising in the cavity of annular space, gas-flow closure circle and the tested non-return valve of sealing plug then, pressure in the cavity of pressure and tested non-return valve in this annular space is kept equated, the outlet of tested non-return valve is carried out virtual isolation with the constant wall pressure ring of annular space formation; Detect pressure and the isobaric required additional fluid flow value of constant wall pressure ring kept in this tested non-return valve cavity at last, be the slip of valve; Described test fluid is the also available liquid of available gas both.
2. testing equipment of realizing the described method of claim 1 is characterized in that: comprise equal-pressure virtual barrier assembly (S) and leak locator (D):
The virtual isolation group of this equipressure (S) part comprises: the annular space (2) between cock body (1), two O-ring seals (9), pull bar (3), carriage (4), nut (5), location jackscrew (8), two gas-flow closure circles (9), O-ring seal admission piece (A1) and annular space admission piece (B1), in two parallel annular grooves of the outer peripheral face of cock body (1), an O-ring seal (9) is housed respectively, cock body (1) periphery several with location jackscrews (8) and tested valve outlet inwall location; The inboard center of cock body (1) is connected with an end of axial pull bar (3), and the other end of this pull bar (3) is connected with the central authorities of carriage (4) by nut (5), and the edge of this carriage (4) rests on the reducer between tested valve outlet and the body cavity;
This leak locator (D) has following three tunnel inputs, shared same source of the gas:
The first via is made up of the variable valve (K1), multirange flowmeter (Q1), tensimeter (P1) and the stop valve (K2) that connect successively, the output terminal of (K2) even connects the And pressurising with the valve pocket of pipeline and tested valve during test, measure the slip of this tested valve with the flow replenishment, test pressure is identical with the containment test pressure; When test fluid is used liquid, between variable valve (K1) and multirange flowmeter (Q1), add packaging container (V1);
The variable valve that secondary route connects successively (K3), flowmeter (Q2), tensimeter (P2) and stop valve (K4) are formed, during test, the output terminal of stop valve (K4) even connects the And pressurising with the annular space between the double density seal of pipeline and sealing-plug periphery, when the pressure in this compression ring when test pressure in the valve pocket equates, then constitute equal-pressure virtual isolating seal ring; When test fluid is used liquid, between variable valve (K3) and flowmeter (Q2), add packaging container (V2);
Third Road is made up of the variable valve (K5), tensimeter (P3) and the stop valve (K6) that connect successively, and with pipeline and the Lian And pressurising Xiang of described O-ring seal, this pressure is greater than the valve seal test pressure during test.
3. testing equipment according to claim 2, it is characterized in that: described cock body (1) is made of with goblet along two of outer peripheral face parallel grooves uniform 8 positioning screw holes radially of outer peripheral face, in this groove, put into inflated rubber formula O-ring seal (9), constituted described annular space (2) between the tube wall of two O-ring seals (9) and cock body (1) and described outlet, when the pressure in this annular space (2) when being equated by the pressure in the test valve body chamber, the endoceliac fluid of valve is can not leak by isobaric isolating seal plug, thereby has constituted the effect that equal-pressure virtual is isolated.
4. testing equipment according to claim 3, it is characterized in that: when described cock body (1) is installed, adjust 8 height of following closely silk, make close cock body (1) and outlet concentric according to the outlet internal diameter, to evenly expanding, be convenient to isolating seal all around during the O-ring seal inflation.
CN2010101965140A 2010-06-10 2010-06-10 Equal-pressure virtual isolation check valve sealing test method and equipment CN101858817B (en)

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Application Number Priority Date Filing Date Title
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CN101858817B CN101858817B (en) 2012-06-27

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CN104142258A (en) * 2013-05-09 2014-11-12 中国石油化工股份有限公司 Core segmented sealing device and application method
CN104266805A (en) * 2014-10-28 2015-01-07 中国核工业华兴建设有限公司 Detection device and detection method for detecting air tightness of air-tight door of nuclear power plant by using constant pressure method
CN104634524A (en) * 2013-11-11 2015-05-20 富鼎电子科技(嘉善)有限公司 Air tightness detection device
CN105675232A (en) * 2016-03-26 2016-06-15 宣月罗 Gas supply testing device
CN105699024A (en) * 2016-03-26 2016-06-22 宣月罗 Internal pressurizing testing machine
CN105784296A (en) * 2016-03-26 2016-07-20 宣月罗 Internal pressurizing air detector
CN105823610A (en) * 2016-03-26 2016-08-03 宣月罗 Pressurization detection device
CN105823611A (en) * 2016-03-26 2016-08-03 宣月罗 High-pressure gas detector
CN105823609A (en) * 2016-03-26 2016-08-03 宣月罗 Gas tightness quality detection device
CN105841897A (en) * 2016-03-26 2016-08-10 宣月罗 Sealing tester
CN105841895A (en) * 2016-03-26 2016-08-10 宣月罗 Joint sealing test device
CN105865727A (en) * 2016-03-26 2016-08-17 宣月罗 Pressure-keeping detection device
CN107179169A (en) * 2017-06-14 2017-09-19 中广核工程有限公司 A kind of nuclear power station check valve action test set and test method

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CN201083591Y (en) * 2007-07-20 2008-07-09 比亚迪股份有限公司 Silencer air tightness detection device
CN201327434Y (en) * 2008-11-27 2009-10-14 秦山核电有限公司 On-line experimental unit for portable welding check valve
CN101726396A (en) * 2009-12-17 2010-06-09 中国航天科技集团公司第五研究院第五一○研究所 Device and method for detecting leak rate of O type rubber sealing ring used for spaceflight

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CN1607348A (en) * 2003-10-15 2005-04-20 高砂工程株式会社 Check valve for detecting water leakage and water leakage alarm system using the same
CN1782683A (en) * 2004-12-03 2006-06-07 大亚湾核电运营管理有限责任公司 Lifting check-valve leakage detecting device and detecting method
CN201083591Y (en) * 2007-07-20 2008-07-09 比亚迪股份有限公司 Silencer air tightness detection device
CN201327434Y (en) * 2008-11-27 2009-10-14 秦山核电有限公司 On-line experimental unit for portable welding check valve
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CN104142258A (en) * 2013-05-09 2014-11-12 中国石油化工股份有限公司 Core segmented sealing device and application method
CN104634524A (en) * 2013-11-11 2015-05-20 富鼎电子科技(嘉善)有限公司 Air tightness detection device
CN104266805A (en) * 2014-10-28 2015-01-07 中国核工业华兴建设有限公司 Detection device and detection method for detecting air tightness of air-tight door of nuclear power plant by using constant pressure method
CN104266805B (en) * 2014-10-28 2016-12-07 中国核工业华兴建设有限公司 Constant-voltage method detection nuclear power station gas-tight door bubble-tight detection device and detection method thereof
CN105841895B (en) * 2016-03-26 2019-04-19 宣月罗 A kind of connector envelope measurement equipment
CN105823610A (en) * 2016-03-26 2016-08-03 宣月罗 Pressurization detection device
CN105823611A (en) * 2016-03-26 2016-08-03 宣月罗 High-pressure gas detector
CN105823609A (en) * 2016-03-26 2016-08-03 宣月罗 Gas tightness quality detection device
CN105841897A (en) * 2016-03-26 2016-08-10 宣月罗 Sealing tester
CN105841895A (en) * 2016-03-26 2016-08-10 宣月罗 Joint sealing test device
CN105865727A (en) * 2016-03-26 2016-08-17 宣月罗 Pressure-keeping detection device
CN105699024A (en) * 2016-03-26 2016-06-22 宣月罗 Internal pressurizing testing machine
CN105675232A (en) * 2016-03-26 2016-06-15 宣月罗 Gas supply testing device
CN105784296A (en) * 2016-03-26 2016-07-20 宣月罗 Internal pressurizing air detector
CN105823611B (en) * 2016-03-26 2018-10-02 德庆雅昌不锈钢管业有限公司 A kind of high pressure gas inspection machine
CN105784296B (en) * 2016-03-26 2018-10-30 辛集市邑阔天然气有限公司 Gas check is pressurized in a kind of
CN105823609B (en) * 2016-03-26 2019-01-04 深圳市万福达精密设备股份有限公司 A kind of air-tightness quality inspection equipment
CN105675232B (en) * 2016-03-26 2019-01-15 东阳市燃气有限公司 A kind of gas supply test device
CN105865727B (en) * 2016-03-26 2019-01-22 大连海密梯克泵业有限公司 A kind of pressure maintaining detection device
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CN105841897B (en) * 2016-03-26 2019-02-05 大连海密梯克泵业有限公司 A kind of performing leak test machine
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CN107179169A (en) * 2017-06-14 2017-09-19 中广核工程有限公司 A kind of nuclear power station check valve action test set and test method

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