CN203571129U - Bypass check valve for containment isolating system - Google Patents
Bypass check valve for containment isolating system Download PDFInfo
- Publication number
- CN203571129U CN203571129U CN201320661011.5U CN201320661011U CN203571129U CN 203571129 U CN203571129 U CN 203571129U CN 201320661011 U CN201320661011 U CN 201320661011U CN 203571129 U CN203571129 U CN 203571129U
- Authority
- CN
- China
- Prior art keywords
- valve
- valve body
- flap
- spool
- isolation system
- 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 - Lifetime
Links
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract 3
- 238000007906 compression Methods 0.000 abstract 3
- 230000006837 decompression Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 230000035900 sweating Effects 0.000 description 1
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- Check Valves (AREA)
Abstract
The utility model belongs to the technical field of check valves for nuclear power units, and particularly relates to a bypass check valve for a containment isolating system. The bypass check valve comprises a valve body (1), a valve cover (11), a spool (5), a valve clack (2) and a compression spring (6). The valve cover (11) is connected to the upper portion of the valve body (1), the spool (5), a valve cavity input channel and a valve cavity output channel are arranged in the valve body (1), the valve clack (2) is arranged at the lower end of the spool (5) sleeved with the compression spring (6), and the valve clack (2) and the valve body (1) form a cross section capable of being closed. Opening and closing of the check valve is effectively controlled by arranging the compression spring, and not only can the decompression requirement in the overpressure state be met, but also the seal requirement under the static condition can be met. Besides, the check valve can be arranged on a pipeline at a horizontal angle, a vertical angle or an inclined angle respectively, so that the requirement for variable field pipelines is met.
Description
Technical field
The utility model belongs to nuclear power plant check valve technical field, is specifically related to a kind of Containment Isolation System bypass non-return valve.
Background technique
At present, nuclear power plant is all provided with safe isolated system both at home and abroad, to guarantee that nuclear reaction device occurs radioactivity to be controlled to certain area under accident conditions.Consider that nuclear power plant great majority operate under the state of High Temperature High Pressure; the system being connected with major loop must realize as early as possible isolation under accident conditions; therefore must overpressure protection facility be set to isolated system; to guarantee that in serious accident situation, isolated system is not damaged, thus the diffusion path of control radioactive material.The most frequently used overpressure protection facility of nuclear power station arranges bypass non-return valve to safe isolated system bypass exactly at present, and bore is between 10～25mm.
According to the service condition in each power station, it is very general to there is serious interior situation of leaking in check valve, and often causing cannot be by the regular seal tightness test of safe isolated system.In leak-down rate, exceed after a threshold value, must overhaul check valve.Prior art adopts more small-bore check valve mostly to be Lift check valve, mostly can only level install by the restriction of itself structural feature, cannot meet the changeable requirement of factory building pipeline.In addition, check valve of the prior art cannot carry out on-bne repair, each maintenance all must be after cutting processed offline, not only overhaul efficiency is low, and in cutting maintenance process, relating to the fire operations such as control zone polishing, welding, protective measures are numerous and diverse, and are subject to foreign matter impact.
Model utility content
The utility model technical issues that need to address are: nuclear power plant check valve sealing of the prior art is poor.
The technical solution of the utility model is as described below:
A kind of Containment Isolation System bypass non-return valve, comprises valve body and flap, and valve inner is provided with valve pocket input channel and valve pocket output channel, and flap and valve body form cross section that can be closed; Containment Isolation System bypass non-return valve also comprises valve gap, spool and holddown spring: valve gap is threaded connection on valve body top; Valve inner is provided with spool, and cover has the spool lower end of holddown spring to be provided with flap; When check valve is during in superpressure state, the medium of valve pocket input channel promotes flap, spool and holddown spring and moves, and flap departs from valve body, and media flow arrives valve pocket output channel; When check valve is during in static state, flap and valve body form closing face, stop the media flow of valve pocket input channel to valve pocket output channel.
As preferred version: adopt band pure nickel packing ring to be threaded between described valve gap and valve body.
As preferred version: described spool and valve body adopt the sealing of plane graphite overlay cladding, preferably adopt face sealing means.
As preferred version: described spool, holddown spring and flap are fixed on valve gap by adjusting bolt.The beneficial effects of the utility model are:
(1) Containment Isolation System bypass non-return valve of the present utility model, by being set, holddown spring effectively controls the unlatching closure of check valve, the release demand that can either meet under superpressure state meets again the seal request under quiescent conditions, avoided the movement of flap in small pressure reduction or system vibration situation, the frequent movement that has reduced conventional safety check causes sealing surface wear and small medium to rest on the possibility that sealing surface causes seal failure.
(2) Containment Isolation System bypass non-return valve of the present utility model all can be installed on the pipeline at level, vertical, angle of inclination, has met the changeable requirement of place pipeline;
(3) Containment Isolation System bypass non-return valve of the present utility model, valve gap and valve body are threaded connection, and are convenient to on-bne repair.
Accompanying drawing explanation
Fig. 1 is Containment Isolation System bypass non-return valve sectional drawing of the present utility model.
In figure, 1-valve body; 2-flap; 3-cushion block; 4-guide sleeve; 5-spool; 6-holddown spring; 7-pendant collet; 8-pad; 9-holddown spring seat; 10-spacer; 11-valve gap.
Embodiment
Below in conjunction with drawings and Examples, Containment Isolation System bypass non-return valve sectional drawing of the present utility model is elaborated.
As shown in Figure 1, Containment Isolation System bypass non-return valve of the present utility model, comprises valve body 1, valve gap 11, spool 5, flap 2 and holddown spring 6.Valve gap 11 is threaded connection on valve body 1 top; Valve body 1 inside is provided with spool 5, valve pocket input channel and valve pocket output channel; Cover has spool 5 lower ends of holddown spring 6 to be provided with flap 2, and flap 2 and valve body 1 form cross section that can be closed.When the pressure medium of valve pocket input channel is enough large, check valve is when superpressure state, and medium promotes flap 2, spool 5 and holddown spring 6 and moves along the guide sleeve 4 arranging in valve body, and flap 2 departs from valve body 1, and media flow is to valve pocket output channel; When the pressure medium of valve pocket input channel is not enough to promote flap 2, spool 5 and holddown spring 6, move, check valve is when static state, and flap 2 forms closing face with valve body 1, stops media flow to valve pocket output channel.
Between described valve gap 11 and valve body 1, adopt band pure nickel packing ring to be threaded, to realize sealing and on-bne repair.As preferred implementation, before check valve dispatches from the factory, then spot welding seal is carried out in valve gap 11, valve body 1 junction, further avoided the possibility leaking outside.
Described spool 5 adopts the sealing of plane graphite overlay cladding with valve body 1, and preferably sealing means is face sealing.
Described spool 5, holddown spring 6 and flap 2 are fixed on valve gap 11 by adjusting bolt, are convenient to on-bne repair and installation.
The coefficient of stiffiness of described holddown spring 6 and decrement arrange according to pipeline pressure medium concrete condition.When the pressure medium of valve pocket input channel raises, the thrust of generation can overcome in the impacting force of holddown spring 6 and the situation of spool 5 gravity, and flap 2 moves up, and medium upwards flow to valve pocket output channel, reduces the pressure of medium to flap 2, thereby realizes release; Flap 2 auto back seat under the effect of holddown spring 6 after check valve front and back pressure reduction reduces, realizes sealing again.Holddown spring 6 is set, can avoid the movement of flap 2 in small pressure reduction or system vibration situation, avoid excessive wear, therefore, in system, normally work in (main isolating valve is opened, by-pass line micro-pressure-difference) situation, the effect of check valve is equivalent to the stop valve of a bypass, can realize good sealing, avoid the frequent movement of conventional check valve to cause sealing surface wear and small medium to rest on the possibility that sealing surface causes seal failure.
Containment Isolation System bypass non-return valve of the present utility model is core secondary Containment Isolation System bypass functionality check valve, can be applicable to the safe isolated system of most of nuclear facility, and its design parameter is as follows.
| Design pressure (MPa) | 20 | 11 | 2.5 |
| Test pressure (MPa) | 30±0.9 | 18±0.54 | 4.5±0.14 |
A kind of Containment Isolation System bypass non-return valve leak check method, comprises the following steps:
A kind of Containment Isolation System bypass non-return valve quality determining method, comprises the following steps:
(1) before assembling, with A level water, clean all parts;
(2) after assembling, with 30 ± 0.9MPa pressure, carry out water pressure test for strength, test(ing) medium is A level water, and temperature is room temperature, be no more than 38 ℃, dwell time is not less than 10min, and criterion of acceptability is: during test check valve without leaking outside, seepage or the phenomenon of sweating, valve body 1 is without residual deformation;
(3) carry out gas seal test, after the valve assembling is dried to 15 minutes in 150～200 ℃ of environment, close valve pocket output channel, from valve pocket input channel, being full of temperature is 20MPa for being no more than 38 ℃, pressure, purity is more than 99.9% nitrogen, dwell time is not less than 3min, check valve is immersed in the water or is filled foam, and criterion of acceptability is: do not have bubble or bubbling phenomenon to occur;
(4) carry out high-pressure seal experiment, be full of the hydraulic pressure of 16MPa from valve pocket output channel, the dwell time is not less than 10min, and criterion of acceptability is: valve body 1 and flap 2 sealing surface junction points are without any leakage;
(5) carry out low pressure seal test, the A level water and the purity that from valve pocket output channel, are full of 0.39～0.44MPa are respectively more than 99.9 nitrogen, dwell time is not less than 10min, and criterion of acceptability is: the leak-down rate of valve body 1 and flap 2 sealing surface junction point water is less than or equal to 1cm
3the leak-down rate of/h, gas is less than or equal to 100cm
3/ h; Other position of valve has not allowed any leakage;
(6) carry out cold conditions function test, serviceability temperature is room temperature and is no more than 38 ℃, pressure is that A level water or the purity of 15.7 ± 0.3MPa is more than 99.9% nitrogen, check valve is carried out to three times and open test, criterion of acceptability is: starting differential pressure is 0.2 ± 0.05MPa, operation, without jam, can normally be returned seat after earth pressure release;
(7) carry out hot function test, 350～358 ℃ of serviceability temperatures, pressure is the water of 19 ± 0.3MPa, check valve is carried out to three times and open test, first increase test loop pressure to 1 ± 0.3MPa, then from valve inlet, sentence and be no more than 0.01MPa/s pressing speed and slowly increase test pressure, until valve opening, criterion of acceptability is: starting differential pressure is 0.2 ± 0.05MPa, and operation, without jam, can normally be returned seat after earth pressure release;
(8) carry out the test of cold conditions operating life, according to cold conditions function test method switch motion 2700 times, criterion of acceptability: pressure boundary is complete, not damaged, action are normal, and the leak-down rate obtaining according to low pressure seal test method is no more than 2cm
3/ h(water), or test in through once grind after leak-down rate be no more than 1cm
3/ h(water);
(9) carry out hot operating life test, according to cold conditions function test method switch motion 50 times, criterion of acceptability: pressure boundary is complete, not damaged, action are normal, and the leak-down rate obtaining according to low pressure seal test method is no more than 2cm
3/ h(water), or test in through once grind after leak-down rate be no more than 1cm
3/ h(water);
(10), to up-to-standard check valve, apply that clean hot blast is dried, drying and processing.
Claims (5)
1. a Containment Isolation System bypass non-return valve, comprises valve body (1) and flap (2), and valve body (1) inside is provided with valve pocket input channel and valve pocket output channel, and flap (2) and valve body (1) form cross section that can be closed; It is characterized in that: Containment Isolation System bypass non-return valve also comprises valve gap (11), spool (5) and holddown spring (6): valve gap (11) is threaded connection on valve body (1) top; Valve body (1) inside is provided with spool (5), and cover has spool (5) lower end of holddown spring (6) to be provided with flap (2); When check valve is during in superpressure state, it is mobile that the medium of valve pocket input channel promotes flap (2), spool (5) and holddown spring (6), and flap (2) departs from valve body (1), and media flow arrives valve pocket output channel; When check valve is during in static state, flap (2) forms closing face with valve body (1), stops the media flow of valve pocket input channel to valve pocket output channel.
2. Containment Isolation System bypass non-return valve according to claim 1, is characterized in that: between described valve gap (11) and valve body (1), adopt band pure nickel packing ring to be threaded.
3. Containment Isolation System bypass non-return valve according to claim 1 and 2, is characterized in that: described spool (5) adopts the sealing of plane graphite overlay cladding with valve body (1).
4. Containment Isolation System bypass non-return valve according to claim 3, is characterized in that: described plane graphite overlay cladding sealing employing face sealing means.
5. Containment Isolation System bypass non-return valve according to claim 1 and 2, is characterized in that: described spool (5), holddown spring (6) and flap (2) are fixed on valve gap (11) by adjusting bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320661011.5U CN203571129U (en) | 2013-10-24 | 2013-10-24 | Bypass check valve for containment isolating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320661011.5U CN203571129U (en) | 2013-10-24 | 2013-10-24 | Bypass check valve for containment isolating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203571129U true CN203571129U (en) | 2014-04-30 |
Family
ID=50538861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320661011.5U Expired - Lifetime CN203571129U (en) | 2013-10-24 | 2013-10-24 | Bypass check valve for containment isolating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203571129U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574110A (en) * | 2013-10-24 | 2014-02-12 | 江苏核电有限公司 | Bypass check valve for containment isolation system |
-
2013
- 2013-10-24 CN CN201320661011.5U patent/CN203571129U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574110A (en) * | 2013-10-24 | 2014-02-12 | 江苏核电有限公司 | Bypass check valve for containment isolation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
|
| CX01 | Expiry of patent term |