CN207894564U - A kind of swing check valve package seal checker - Google Patents
A kind of swing check valve package seal checker Download PDFInfo
- Publication number
- CN207894564U CN207894564U CN201820401531.5U CN201820401531U CN207894564U CN 207894564 U CN207894564 U CN 207894564U CN 201820401531 U CN201820401531 U CN 201820401531U CN 207894564 U CN207894564 U CN 207894564U
- Authority
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- China
- Prior art keywords
- disk
- compression plate
- intermediate supports
- strength support
- interconnecting piece
- 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
Links
- 230000006835 compression Effects 0.000 claims abstract description 46
- 238000007906 compression Methods 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 abstract description 20
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 23
- 238000002788 crimping Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model provides a kind of swing check valve package seal checker, which includes：Strength support disk, intermediate supports disk, compression plate and rod assembly；Strength support disk is provided with interconnecting piece, intermediate supports disk and compression plate are sleeved on interconnecting piece successively, strength support disk, intermediate supports disk and compression plate are provided with O-ring seal between any two, and spiral is connected with the clamp nut for compressing intermediate supports disk, compression plate and strength support disk on interconnecting piece, and when intermediate supports disk, compression plate and strength support disk are compacted, O-ring seal is deformed upon for the gap between sealing intensity support plate and the channel side wall of check-valves；It is threadedly coupled between rod assembly and interconnecting piece and for being installed in check-valves.The utility model has the beneficial effects that：A kind of detection device simple in structure facilitating sealing check-valves is provided, to facilitate the sealing detection of check-valves, improves the efficiency that check valve seal detects.
Description
Technical field
The utility model is related to the technical fields more particularly to a kind of swing check valve sealing detection dress to automobile
It sets.
Background technology
It is general to use during major overhaul after swing check valve breakdown maintenance according to the current common practice of nuclear power plant
Whether the cooperation that blue oil test is detected between flap and valve seat is intact, so that it is guaranteed that the sealing performance of valve.That is, completing sealing surface
After grinding, uniformly smearing blue oil in flap and sealing surface of seat, (a kind of blue material of grease-like will appear corresponding after being squeezed
Trace), then so that flap and valve seat is contacted by external force pressure, judges sealing surface by checking sealing surface contact trace situation
In conjunction with situation.If crimping trace is continuous and uniform, it is all right to be considered as sealing.But blue oil test is to the technical ability of operator
It is more demanding with service experience, if blue oil smearing is blocked up or excessively thin, and during forcing to make flap, valve seat contact
Misoperation is difficult then to reflect true sealing situation.If blue oil smearing is blocked up, even if some position sealing situation is bad
It is good, the trace of continuous uniform can be also obtained on crimping trace；If blue oil smearing is excessively thin, can not be seen during blue oil test
To clearly crimping trace, to judge to seal situation by crimping trace；If forcing that flap and valve seat is made to connect
In tactile process, flap bounces repeated collision or the sliding of flap opposite valve seat, then crimping trace can not also reflect true close
Seal situation.
During opening machine after major overhaul, primary Ioops pressure rises under two pressure platforms of 2.5MPa.g and 7MPa.g,
It respectively will be to RCP120/122/220/222/320/322VP and RCP121/221/321VP being sealed property experiments online, online
It is loose that the slip of leakage test requires the leakage test of relative monomer valve to require.If seal tightness test is unqualified, machine
Group state cannot continue uplink, and the case that recession state repeats repair happens occasionally.For the nuclear power generating sets of gigawatt,
Often it is delayed 1 hour to generate electricity, direct economic loss is probably in hundreds of thousands RMB.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of swing check valve sealing inspection
Survey device.
The utility model is achieved through the following technical solutions：
The utility model provides a kind of swing check valve package seal checker, swing check valve sealing detection dress
Set including：Block the plugging device and experiment valve deck of non-return valve outlet；Wherein, the plugging device includes：Strength support disk,
Intermediate supports disk, compression plate and rod assembly；
The strength support disk is provided with interconnecting piece, and the intermediate supports disk and the compression plate are sleeved on the company successively
In socket part, the strength support disk, intermediate supports disk and the compression plate are provided with O-ring seal, and the company between any two
Spiral is connected with the clamp nut for compressing the intermediate supports disk, compression plate and the strength support disk in socket part, and
When intermediate supports disk, compression plate and the strength support disk are compacted, the O-ring seal deforms upon described for sealing
Gap between strength support disk and the channel side wall of check-valves；It is threadedly coupled simultaneously between the rod assembly and the interconnecting piece
For being installed in the check-valves.
Preferably, the side of the strength support disk towards the intermediate supports disk is provided with the first groove, the centre
Support plate is provided with the first protrusion being inserted into first groove, and the intermediate supports disk is towards the side of the compression plate
It is provided with the second groove, the compression plate is provided with the second protrusion being inserted into second groove.
Preferably, formed between the strength support disk and first protrusion accommodate the strength support disk with it is described in
Between O-ring seal between support plate gap, formed between the intermediate supports disk and second protrusion accommodate it is described in
Between O-ring seal between support plate and the compression plate gap.
Preferably, the rod assembly includes：Pull rod, the crisscross fixer being sleeved on the pull rod, with the pull rod
The lock nut of spiral connection, the lock nut are used to be limited to the crisscross fixer with interconnecting piece cooperation described
On pull rod；Wherein, the interconnecting piece is provided with threaded hole, and the pull rod is provided with the external screw thread coordinated with the threaded hole.
Preferably, the crisscross fixer is provided with and the matched chamfering of the side wall of the check-valves.
Preferably, it is provided with O-ring seal between the interconnecting piece and the compression plate.
Preferably, it is provided with adjust pad between the clamp nut and the compression plate.
The utility model has the beneficial effects that：A kind of detection device simple in structure facilitating sealing check-valves is provided, from
And the sealing detection of check-valves is facilitated, improve the efficiency of check valve seal detection.
Description of the drawings
Fig. 1 is the structural schematic diagram for the swing check valve package seal checker that the utility model embodiment provides；
Fig. 2 is the use state reference chart for the swing check valve package seal checker that the utility model embodiment provides.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
It please refers to Fig.1 and Fig. 2, Fig. 1 is that the structure of swing check valve package seal checker provided by the utility model is shown
It is intended to, Fig. 2 is the use state reference chart of detection device.
The utility model embodiment provides a kind of swing check valve package seal checker, swing check valve sealing
Detection device includes：Block the plugging device 10 and experiment valve deck of non-return valve outlet；Wherein, the plugging device 10 includes：
Strength support disk 11, intermediate supports disk 12, compression plate 13 and rod assembly 17；
The strength support disk 11 is provided with interconnecting piece 112, and the intermediate supports disk 12 and the compression plate 13 cover successively
On the interconnecting piece 112, the strength support disk 11, intermediate supports disk 12 and the compression plate 13 are provided between any two
O-ring seal 14, and spiral is connected with for by the intermediate supports disk 12, compression plate 13 and described on the interconnecting piece 112
The clamp nut 16 that strength support disk 11 compresses, and pressed in intermediate supports disk 12, compression plate 13 and the strength support disk 11
When tight, the O-ring seal 14 is deformed upon for sealing between the strength support disk 11 and the channel side wall of check-valves
Gap；It is threadedly coupled between the rod assembly 17 and the interconnecting piece 112 and for being installed in the check-valves.
In the above-described embodiments, a kind of detection device simple in structure facilitating sealing check-valves is provided, to facilitate
The sealing detection of check-valves improves the efficiency of check valve seal detection.
In order to facilitate detection device provided in this embodiment is understood, detailed retouch is carried out to it with reference to specific attached drawing
It states.
Ripe survey leakage tool is possessed currently on the market, pressure decline method and constant-voltage method can be used to carry out slip survey
Amount, but a closed chamber is established in general requirement, and the slip of the closed chamber is measured using survey leakage tool.Such as lock
Valve, flashboard is contacted with upstream and downstream valve seat after valve is closed, and entire valve chamber becomes closed chamber, and possible leak source is exactly flap and valve
The slip that leakage tool measures the chamber, the as slip of valve are surveyed in the contact site of seat.For screw-lift type check-valves,
Due to the limitation of its design feature, technological difficulties are how to establish closed chamber.
Detection device provided in this embodiment is using principles such as mechanical structure, 14 seal forms of O-ring seal, in check-valves
Effective closure is established in outlet, and valve deck is changed to the experimental rig with test interface, with current npp safety shell C
The parts class test instrument JLY-IV leak detector matches, the interface of the tool and the required fast interface phase of local leak detector
Together.
Plugging device 10 can be divided into two kinds of situations to blocking effective closure of non-return valve outlet, and a kind of situation is real
Existing zero leakage, in the present embodiment, O-ring seal 14 is made of fluorubber material, because the static seal of fluorubber can realize zero
Leakage so kind situation there is a possibility that, but needs experimentally to verify whether to realize zero leakage；Another situation is envelope
For block apparatus 10 there are certain slip, which does not generate substantial effect to measuring the slip at flap, and blocks
The slip of device 10 can be measured by the method for experiment, and such gross leak rate subtracts the slip of plugging device 10
Slip as at flap.
Detection device provided in this embodiment is matched with the parts JLY-IV leak detector, that is, uses the compression of nuclear power plant empty
Gas (M310 heap-type is SAT systems air source) is used as test(ing) medium, test pressure to be not higher than 0.8MPa.g, and reason is as follows：
Compressed air gas source is arranged with quick coupling in each workshop of nuclear power plant, can be used for testing, and test(ing) medium uses
It is convenient；
It is 10 material PU pipes of outer diameter Ф to test pipeline, and experiment connection connects soon；
Using low-pressure compressed air as test(ing) medium, the sealing performance of valve is may insure after leakage test qualification, because
For for swing check valve, if low pressure seal pass the test, the leakage test under other pressure differences centainly merges
Lattice；If qualified using the leakage test that compressed air carries out, the close of other media (such as demineralized water, boric acid solution) is used
Testing sealing is centainly qualified.
Detection device provided in this embodiment includes to block the portions such as plugging device 10 and the experiment valve deck of non-return valve outlet
Part.Outlet is effectively blocked using plugging device 10, it is ensured that realize reliable sealing；It is (real that valve deck is substituted using experiment valve deck
Test and be provided with test hole on valve deck), coordinate plugging device 10 and flap to constitute closed space, uses the parts JLY-IV leak detector
Slip measurement, the difference of 10 slip of the slip measured and plugging device, as at flap are carried out to the closed space
Slip.
The critical component of detection device provided in this embodiment is plugging device 10, it is desirable that 10 install convenient of plugging device,
Sealed reliable, i.e. the tool quality are small as possible, and processing is easy as possible, and intensity wants high to ensure experiment process not because of tool variations
And it causes to leak uncontrollable.
By the structure of the swing check valve of high pressure grade it is found that the valve body of the check-valves is all made of forging form, valve
Body outlet conduit 20 is processed using regular shape, and the precision of finished surface is higher, therefore, can utilize the envelope of regular shape
Block apparatus 10 is sealed.In valve chamber pressurising during leakage test, thus the stress of plugging device 10 be it is unidirectional, can basis
20 shape processing of valve export pipeline is used for the pull rod 171 of 10 axially position of plugging device.
In specific setting, the structure for closure includes：Strength support disk 11, intermediate supports disk 12, compression plate 13 with
And rod assembly 17；
The strength support disk 11 is provided with interconnecting piece 112, and the intermediate supports disk 12 and the compression plate 13 cover successively
On the interconnecting piece 112, the strength support disk 11, intermediate supports disk 12 and the compression plate 13 are provided between any two
O-ring seal 14, and spiral is connected with for by the intermediate supports disk 12, compression plate 13 and described on the interconnecting piece 112
The clamp nut 16 that strength support disk 11 compresses, and pressed in intermediate supports disk 12, compression plate 13 and the strength support disk 11
When tight, the O-ring seal 14 is deformed upon for sealing between the strength support disk 11 and the channel side wall of check-valves
Gap；It is threadedly coupled between the rod assembly 17 and the interconnecting piece 112 and for being installed in the check-valves.Pass through
Clamp nut 16 compresses three support plates so that O-ring seal 14 is deformed upon the outlet of plugging device 10 and check-valves
Road 20 seals.
In specific setting, the side of the strength support disk 11 towards the intermediate supports disk 12 is provided with the first groove
111, the intermediate supports disk 12 is provided with the first protrusion 121 being inserted into first groove 111, the intermediate supports disk
12 are provided with the second groove 122 towards the side of the compression plate 13, and the compression plate 13 is provided with that be inserted into described second recessed
The second protrusion 131 in slot 122.That is protrusion and groove structure, and strength support have been correspondingly arranged between three disks respectively
It is formed between disk 11 and first protrusion 121 O-shaped between the receiving strength support disk 11 and the intermediate supports disk 12
The gap of sealing ring 14 forms between the intermediate supports disk 12 and second protrusion 131 and accommodates the intermediate supports disk 12
The gap of O-ring seal 14 between the compression plate 13.By the first protrusion 121 of setting and the second protrusion 131 so that O
Type sealing ring 14 deformation can only occur when deforming upon along the direction of sealing is realized.
In addition, in order to further improve sealing effect, O is provided between the interconnecting piece 112 and the compression plate 13
Type sealing ring 14.Gap between disk is prevented liquid entry into, sealing effect is further improved.More preferably, in order to avoid
When compression, the case where dislocation between O-ring seal 14 and compression plate 13.In specific setting, clamp nut 16 with it is described
Adjust pad 15 is provided between compression plate 13.To ensure when clamp nut 16 adjusts, O-ring seal 14 and compression plate 13
Between be always maintained at contact.
Therein, the rod assembly 17 is used to provide unidirectional fixed force to plugging device 10, and non-return is entered in liquid
When in valve, plugging device 10 is anchored by rod assembly 17, avoids being rushed out outlet conduit 20, specifically, the rod assembly 17
Including：Pull rod 171, the crisscross fixer 172 being sleeved on the pull rod 171, the locking spiral shell being connect with 171 spiral of the pull rod
Mother 173, the lock nut 173 is used to coordinate with the interconnecting piece 112 is limited to the pull rod by the crisscross fixer 172
On 171；Wherein, the interconnecting piece 112 is provided with threaded hole, and the pull rod 171 is provided with the outer spiral shell coordinated with the threaded hole
Line.And in specific setting, as seen from Figure 2, it is provided with chamfering on outlet conduit 20, in order to improve anchoring effect, ten
Word fixed frame 172 is provided with and the matched chamfering of the side wall of the check-valves.So that crisscross fixer 172 can be stablized
Be anchored in check-valves.
In order to facilitate understanding, below by taking the swing check valve of the NJXSSA0150 models of VELAN companies production as an example, only
It is φ 132 to return 20 internal diameter of valve outlet pipeline.The plugging device 10 is divided into cross pull rod 171, strength support disk 11, intermediate branch
The major parts such as support plate 12, compression plate 13, the shape of the shape and 20 reducing of check-valves outlet conduit at 172 top of crisscross fixer
It is identical, for entire plugging device 10 non-return valve outlet axially position；The function of three disks is easy for O-ring seal 14
Dismounting, and the effect of the spline structure between adjacent disk be eliminate three disks relative rotation, in outermost disk
There is the pin for being separated by 180 ° in outside, is held with a firm grip the pin using specific purpose tool, and nut fastening tool is used to fasten clamp nut 16, uses
To adjust the overall thickness of three disks.The maximum gauge of three disks is φ 130, and O-shaped sealing is equipped between each two disk
Circle 14,14 size of O-ring seal are internal diameter φ 112, diameter of section 10mm.The installation groove depth of the big O-ring seal of twice 14 is
Fixed, width can adjust, and maximum adjustment amount can be compressed to 7mm.Plugging device 10 install it is in place after spiral shell compressed by fastening
Mother 16 adjusts the width of 14 mounting groove of O-ring seal, and the extension deformation of O-ring seal 14, outer diameter is made to increase, final to realize closure dress
Set the sealing between 10 and pipeline.
Plugging device 10 there are three types of the O-ring seal 14 of specification (three kinds of specification sums five), passes through O-ring seal 14 altogether
And the cooperation of check-valves outlet conduit 20, plugging device 10 itself form closed space, have on intermediate disc and lead to twice
The pilot passageway of big O-ring seal 14, which has individual test interface, for measuring the leakage of plugging device 10
Rate, and collect during measuring overall leakage rate the slip at first big O-ring seal 14.
20 uniform duct length of NJXSSA0150 check-valves outlet conduit is about 120mm, and 10 overall thickness of plugging device exists
Between 53-59mm, therefore the length of non-return valve outlet uniform tube installs plugging device 10 enough, can ensure O-ring seal 14
Avoid the irregular region such as weld seam.After plugging device 10 is installed in place, which is measured by local leak detector
Slip Q1.O-ring seal 14 is sealed using fluorubber material, for static seal, fluorubber can realize zero leakage.
So when measuring 10 slip of plugging device using local leak detector, if it find that leakage rate score is larger, then illustrate to block
Device 10 is installed improper, and possible cause is as follows：
Clamp nut 16 does not compress completely, leads to the big 14 not compression completely of O-ring seal of twice, i.e., outer diameter does not extend into foot
Enough sealings realized to pipeline；
Plugging device 10 is mounted on position while welding, because position while welding internal diameter of the pipeline is there are the irregular region such as overlap,
Therefore it cannot achieve good sealing.
Plugging device 10 is ressembled according to actual conditions, until the slip Q1 of plugging device 10 is sufficiently small.
Then the components such as installation experiment valve deck, measure check-valves overall leakage rate Q2.At this point, for measuring 10 slip of plugging device
Pilot passageway no longer pressurising, but for collecting the slip Q3 of first big O-ring seal 14, then the slip Q at flap
=Q2-Q3.
It can be seen from the above description that present embodiments providing a kind of detection dress simple in structure facilitating sealing check-valves
It sets, to facilitate the sealing detection of check-valves, improves the efficiency of check valve seal detection.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle
Within the scope of shield.
Claims (7)
1. a kind of swing check valve package seal checker, which is characterized in that including：Block non-return valve outlet plugging device with
And experiment valve deck；Wherein, the plugging device includes：Strength support disk, intermediate supports disk, compression plate and rod assembly；
The strength support disk is provided with interconnecting piece, and the intermediate supports disk and the compression plate are sleeved on the interconnecting piece successively
On, the strength support disk, intermediate supports disk and the compression plate are provided with O-ring seal, and the interconnecting piece between any two
Upper spiral is connected with the clamp nut for compressing the intermediate supports disk, compression plate and the strength support disk, and in
Between support plate, compression plate and the strength support disk when being compacted, the O-ring seal is deformed upon for sealing the intensity
Gap between support plate and the channel side wall of check-valves；It is threadedly coupled and is used between the rod assembly and the interconnecting piece
It is installed in the check-valves.
2. swing check valve package seal checker according to claim 1, which is characterized in that strength support disk court
The side of the intermediate supports disk is provided with the first groove, the intermediate supports disk, which is provided with, to be inserted into first groove
The first protrusion, the side of intermediate supports disk towards the compression plate is provided with the second groove, and the compression plate is provided with
The second protrusion being inserted into second groove.
3. swing check valve package seal checker according to claim 2, which is characterized in that the strength support disk with
The gap for accommodating the O-ring seal between the strength support disk and the intermediate supports disk is formed between first protrusion,
It is formed between the intermediate supports disk and second protrusion O-shaped close between the receiving intermediate supports disk and the compression plate
The gap of seal.
4. swing check valve package seal checker according to claim 2, which is characterized in that the rod assembly packet
It includes：Pull rod, the crisscross fixer being sleeved on the pull rod, the lock nut being connect with the pull rod spiral, the locking spiral shell
The crisscross fixer is limited to the pull rod by mother for coordinating with the interconnecting piece；Wherein, the interconnecting piece is provided with
Threaded hole, the pull rod are provided with the external screw thread coordinated with the threaded hole.
5. swing check valve package seal checker according to claim 4, which is characterized in that the crisscross fixer is set
It is equipped with and the matched chamfering of the side wall of the check-valves.
6. according to Claims 1 to 5 any one of them swing check valve package seal checker, which is characterized in that the company
It is provided with O-ring seal between socket part and the compression plate.
7. swing check valve package seal checker according to claim 6, which is characterized in that the clamp nut and institute
It states and is provided with adjust pad between compression plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820401531.5U CN207894564U (en) | 2018-03-23 | 2018-03-23 | A kind of swing check valve package seal checker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820401531.5U CN207894564U (en) | 2018-03-23 | 2018-03-23 | A kind of swing check valve package seal checker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207894564U true CN207894564U (en) | 2018-09-21 |
Family
ID=63539973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820401531.5U Expired - Fee Related CN207894564U (en) | 2018-03-23 | 2018-03-23 | A kind of swing check valve package seal checker |
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| Country | Link |
|---|---|
| CN (1) | CN207894564U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779918A (en) * | 2020-07-10 | 2020-10-16 | 浙江汇之秋科技发展有限公司 | Pipeline plugging device and method for detecting sealing performance of STD series check valves by using same |
| CN114526877A (en) * | 2022-02-22 | 2022-05-24 | 三门核电有限公司 | Check valve low-pressure-difference sealing performance detection system and detection method |
-
2018
- 2018-03-23 CN CN201820401531.5U patent/CN207894564U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779918A (en) * | 2020-07-10 | 2020-10-16 | 浙江汇之秋科技发展有限公司 | Pipeline plugging device and method for detecting sealing performance of STD series check valves by using same |
| CN114526877A (en) * | 2022-02-22 | 2022-05-24 | 三门核电有限公司 | Check valve low-pressure-difference sealing performance detection system and detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |