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 PDFInfo
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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
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 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.
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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 |
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| 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 |
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| CN105675232A (en) * | 2016-03-26 | 2016-06-15 | 宣月罗 | Gas supply testing device |
| CN105841895B (en) * | 2016-03-26 | 2019-04-19 | 宣月罗 | Joint sealing equipment |
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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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