CN101818816A - Cathodic protection corrosion-proof valve - Google Patents
Cathodic protection corrosion-proof valve Download PDFInfo
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- CN101818816A CN101818816A CN 201010136049 CN201010136049A CN101818816A CN 101818816 A CN101818816 A CN 101818816A CN 201010136049 CN201010136049 CN 201010136049 CN 201010136049 A CN201010136049 A CN 201010136049A CN 101818816 A CN101818816 A CN 101818816A
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- 238000004210 cathodic protection Methods 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims abstract description 41
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- 229910000861 Mg alloy Inorganic materials 0.000 claims description 20
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Abstract
一种阴极保护防腐蚀阀门，在阀体上制作有与阀体腔体联通的进口a和出口b，阀体上进口a一侧设有压盖，阀体内设有可绕自身轴线旋转的阀杆，阀杆上设有打开/关闭所述进口a的蝶板，阀杆顶端与阀体之间设有填料压盖和填料，在蝶板两侧面分别设有牺牲阳极片。本发明在蝶板两侧分别设牺牲阳极片，阀门使用时，设置的牺牲阳极片和拟保护的部件都处于液体中，牺牲阳极片变成离子进入液体，失去的电子传给阀体内的零部件给其以保护。通过牺牲阳极的作用，阀门内部的部件处于阴极保护状态，保护阀门材料不受流体介质的腐蚀，增加了阀门的抗冲蚀能力，提高了阀门的密封性能，延长了阀门的使用寿命。
A cathodic protection anti-corrosion valve, the valve body is made with an inlet a and an outlet b communicating with the cavity of the valve body, a gland is arranged on the side of the inlet a on the valve body, and a valve stem that can rotate around its own axis is arranged in the valve body , the valve stem is provided with a butterfly plate for opening/closing the inlet a, a packing gland and packing are arranged between the top of the valve stem and the valve body, and sacrificial anode pieces are respectively arranged on both sides of the butterfly plate. In the present invention, sacrificial anodes are respectively arranged on both sides of the butterfly plate. When the valve is in use, the set sacrificial anodes and the parts to be protected are all in the liquid, the sacrificial anodes become ions and enter the liquid, and the lost electrons are transferred to zero in the valve body. parts to protect it. Through the function of the sacrificial anode, the internal parts of the valve are in a state of cathodic protection, which protects the valve material from the corrosion of the fluid medium, increases the erosion resistance of the valve, improves the sealing performance of the valve, and prolongs the service life of the valve.
Description
Technical field
The present invention relates to a kind of valve that is applied in the fluid pipeline, relate in particular to a kind of anticorrosion valve.
Background technique
Valve is as one of main core parts of pressure piping, it is the important component part of pressure piping, be widely used in essential industry facility and urban lifeline engineerings such as petrochemical industry, combustion gas, metallurgy, electric power, in the development of the national economy and people's activity in production, brought into play important function.But the fluid pipeline control valve of the various models of using can produce corrosion in various degree now, has influence on sealability, and the valve corrosion causes the material waste, increase energy consumption, cause valve leak, befouling environment, cause taking place casualty accident, threaten safety in production.More than these situations all can bring in various degree economic loss.
At present, in existing patented technology, anticorrosion valve commonly used has following three classes mostly:
One class is by the improvement valve mechanism, and minimizing contacts with corrupt liquid.The patent No. is 95117085.6 Chinese invention patent, discloses a kind of leakage-less corrosion-resistant controllable valve, move by magnetic force control clack valve, thereby the closure or openness of control valve is not easy to wear; The patent No. is 90206833.4 Chinese utility model patent, a kind of corrosion-resistant improvement valve is disclosed, change whole valve rod into upper valve rod and lower valve rod two-part, and will be in seal ring and change with the rotation screw thread of upper/lower positions and be put on the upper valve rod, upper valve rod is in the above position of seal ring, improves the valve anti-corrosion capability.
Another kind of is to adopt new corrosion resistant material to improve the anti-corrosion capability of valve.The patent No. is 01141067.1 Chinese invention patent, disclose a kind of new structure ceramic valve, its valve seat and flap are all made with stupalith, seal with graphite packing between valve seat and the valve body, and fix by gland, by changing structure and adopting corrosion resistant material to improve the valve anti-corrosion capability; Number of patent application is 200710000292.9 Chinese invention patent, discloses a kind of high temperature resistant corrosion resistant high-strength graphite-carbon composite valve, and valve rod and spool adopt carbon carbon composite to make, and valve seat adopts graphite to make, and realizes anti-corrosion.
Also having a class is to add lining or the isolated corrupt liquid of coating at valve internal, and the patent No. is 90201262.2 Chinese utility model patent, discloses the anticorrosion valve of a kind of cast stone lining, sets up the cast stone lining and realize anti-corrosion in valve; The patent No. is 97233920.5 Chinese utility model patent, disclose a kind ofly high temperature resistantly, anti-wash away, anticorrosion valve, be transition layer to be set earlier, stupalith and plasticizer or self-melting alloy work lining are set on transition layer at valve gap, body cavity, closure member, valve base surface.
Though above-mentioned patent is in the anti-corrosion capability that has improved valve in varying degrees, all there is narrow limitation in each, and applicability is narrow, versatility is not strong, and the valve antiseptic effect that has is bad.
Summary of the invention
Technical problem to be solved by this invention is to overcome the shortcoming of above-mentioned valve, provide a kind of simple in structure, corrosion resistant performance good, applicability is strong, versatility is good, the cathodic protection corrosion-proof valve of long service life.
Solving the problems of the technologies described above the technical solution that is adopted is: be manufactured with import a and outlet b with valve body cavity UNICOM on valve body, valve body upper inlet a one side is provided with gland, being provided with in the valve body can be around the valve rod of self axis rotation, valve rod is provided with the butterfly plate of the described import a of opening/closing, be provided with Gland and filler between valve stem tip and the valve body, be respectively arranged with the sacrificial anode sheet in the butterfly plate bi-side.
The sacrificial anode sheet that is arranged on butterfly plate one side of the present invention have at least 1 be installed in the butterfly plate center of circle be evenly distributed on same circumference or different circumference on, the number that is arranged on sacrificial anode sheet on sacrificial anode sheet and the side on the butterfly plate another side is identical, be arranged on the butterfly plate another side center of circle be evenly distributed on same circumference or different circumference on.
Sacrificial anode sheet of the present invention be shaped as circle or rectangle.
Sacrificial anode sheet of the present invention is magnesium alloy anode sheet or zinc alloy anode sheet or aluminum alloy anode sheet.
The present invention is provided with the sacrificial anode sheet respectively in the butterfly plate both sides, and when valve used, the sacrificial anode sheet of setting and the parts of intending protecting all were in the liquid, and the sacrificial anode sheet becomes ion and enters liquid, and the component that the electronics that loses is passed in the valve body give it with protection.By the effect of sacrificial anode, the parts of valve internal are in cathode protecting state, and the protection valve material is not subjected to the corrosion of flowing medium, have increased the anti-impact erosion ability of valve, have improved the sealability of valve, have prolonged the working life of valve.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the arrangement schematic representation of sacrificial anode sheet 10 on the butterfly plate 8 among Fig. 1.
Fig. 3 is the arrangement schematic representation of sacrificial anode sheet 10 on the butterfly plate 8 of the embodiment of the invention 2.
Fig. 4 is the arrangement schematic representation of sacrificial anode sheet 10 on the butterfly plate 8 of the embodiment of the invention 3.
Fig. 5 is the polarization curve after 40 ℃ of following No. 20 steel and the match of magnesium alloy anode in reusing sewage circulating water.
Fig. 6 is No. 20 steel test tube electrode potentials change curve in time.
Embodiment
Below in conjunction with drawings and Examples the present invention is illustrated in further detail, but the invention is not restricted to these embodiments.
In Fig. 1, the cathodic protection corrosion-proof valve of present embodiment is made of block 1, positioning screwn 2, Gland 3, filler 4, valve body 5, valve rod 6, gland 7, butterfly plate 8, attachment pegs 9,10 connections of sacrificial anode sheet.
On valve body 5, be manufactured with the import a and the outlet b of UNICOM in the cavity with valve body 5, valve body 5 upper inlet a one side is with the screw threads for fastening coupling gland 7 that has been fixedly connected, between gland 7 and the valve body 5 seal ring is installed, valve rod 6 radially is installed in the valve body 5, valve rod 6 can be around self axis rotation, on valve rod 6, be installed with butterfly plate 8 with two attachment pegs 9, butterfly plate 8 is the round sheet structure, butterfly plate 8 is positioned at the cavity of valve body 5, butterfly plate 8 is used for import a is opened or closed, rotary valve rod 6, import a can be closed or open to butterfly plate 8 along with rotating.Stretch out outside the valve body 5 upper end of valve rod 6,3 O type rubber rings are installed between valve rod 6 and the valve body 5, between valve rod 6 tops and the valve body 5 filler 4 is housed, is set with Gland 3 outside the valve rod 6, by scyewed joint filler 4 is fixed between valve body 5 and the valve rod 6 between Gland 3 and the valve body 5.Valve rod 6 upper ends are equipped with positioning screwn 2 by scyewed joint, adjust positioning screwn 2, butterfly plate 8 can be fixed on the fixed position of import a.Valve body 5 upper ends are equipped with block 1 by scyewed joint, between block 1 and the valve body 5 rubber ring are installed.
Central position in the both sides of butterfly plate 8 is welded with 1 sacrificial anode sheet 10 respectively, and also available screw threads for fastening coupling is fixedly connected on sacrificial anode sheet 10 central position of butterfly plate 8 both sides.The sacrificial anode sheet 10 of present embodiment is the magnesium alloy anode sheet; sacrificial anode sheet 10 be shaped as circle; the concrete number of sacrificial anode sheet 10, the size of sacrificial anode sheet 10 can be determined by the standard design according to the material of medium of being carried and claimed component and the area that contacts with medium.
In the present embodiment, in butterfly plate 8 both sides is the center of circle with the center, uniformly on the circumference of same radius be welded with 4 sacrificial anode sheets 10 respectively, also available screw threads for fastening coupling is fixedly connected on sacrificial anode sheet 10 on the circumference of same radius of butterfly plate 8 both sides, the sacrificial anode sheet 10 of butterfly plate 8 one sides can overlap on the circumference of same radius with the sacrificial anode sheet 10 of opposite side, also can not overlap.The sacrificial anode sheet 10 of present embodiment is the magnesium alloy anode sheet, sacrificial anode sheet 10 be shaped as rectangle.The connecting relation of other component and component is identical with embodiment 1.It is identical to execute example 1.
In the present embodiment, in butterfly plate 8 both sides is the center of circle with the center, uniformly on the circumference of different radii be welded with 4 sacrificial anode sheets 10 respectively, uniformly on another circumference of different radii be welded with 8 sacrificial anode sheets 10 respectively, also available screw threads for fastening coupling is fixedly connected on sacrificial anode sheet 10 on the circumference of same radius of butterfly plate 8 both sides, the sacrificial anode sheet 10 of butterfly plate 8 one sides can overlap on the circumference of same radius with the sacrificial anode sheet 10 of opposite side, also can not overlap.The sacrificial anode sheet 10 of present embodiment is the magnesium alloy anode sheet, sacrificial anode sheet 10 be shaped as rectangle.The connecting relation of other component and component is identical with embodiment 1.
In above embodiment 1～3, the sacrificial anode sheet 10 that butterfly plate 8 both sides are provided with is the zinc alloy anode sheet.The connecting relation of other component and component is identical with embodiment 1.
In above embodiment 1～3, the sacrificial anode sheet 10 that butterfly plate 8 both sides are provided with is the aluminum alloy anode sheet.The connecting relation of other component and component is identical with embodiment 1.
Working principle of the present invention is as follows:
By rotary valve rod 6, open/close valve thereby make butterfly plate 8 open or close import a.As shown in Figure 1, valve is in closed condition, and butterfly plate 8 seals import a.The flowing medium of import a is realized disconnecting by butterfly plate 8 with the flowing medium of outlet b.The sacrificial anode sheet 10 of present embodiment is arranged on the central position of the left and right sides of butterfly plate 8, in import a side, sacrificial anode sheet 10 and component all are in the liquid, the current potential of sacrificial anode sheet 10 is lower than the valve parts gland 7 of this side and the current potential of butterfly plate 8, sacrificial anode becomes ion and enters liquid, the electronics that loses is passed to gland 7 and butterfly plate 8, makes gland 7 and butterfly plate 8 be in cathode protecting state, is not subjected to the corrosion of flowing medium; In like manner, in the valve components that exports the b side: valve body 5, valve rod 6, butterfly plate 8, attachment pegs 9 also are in cathode protecting state under the protection of sacrificial anode sheet 10, be not subjected to the corrosion of flowing medium.By the effect of sacrificial anode, make the component of valve internal be in cathode protecting state, be not subjected to the corrosion of flowing medium, increase the anti-impact erosion ability of valve, improve the sealability of valve, thereby prolong the working life of valve.
Make the valve internal component be in cathode protecting state by cathode protection technology, be not subjected to the corrosion of flowing medium, increased the anti-impact erosion ability of valve, thereby prolong the working life of valve.The mounting type of remaining parts of the present invention and the mounting type of prior art are just the same, and applicability is strong, and versatility is good.
In order to verify beneficial effect of the present invention, the inventor has carried out a large amount of laboratory research experiments, and various experiments are as follows:
1, corrosion potential and protection potential are measured
Experimental drug: commercially available acetone and anhydrous alcohol (be and analyze alcohol, chemical reagent factory in Xi'an produces), reusing sewage circulating water.
Laboratory apparatus: HH-4 digital display thermostat water bath (Changzhou state China instrument company), Corrtest electro-chemical test system (Central China University of Science and Technology), electrolytic cell is the three-electrode electro Chemical test system, and reference electrode and auxiliary electrode are saturated calomel electrode, platinum electrode (being Shanghai Russell Science and Technology Ltd. produces).
Prepare No. 20 steel test pieces: use 400# successively, the 800# liquid honing, the another side bonding wire is drawn lead, with this face and all the other corner epoxy sealings, after dewatering with acetone wiping oil removing, anhydrous alcohol before the experiment, place exsiccator stand-by, its specification is Φ 16 * 3mm, and test area is 2.01cm
2
Preparation magnesium alloy anode sample: the magnesium alloy sheet of intercepting certain-length is got 2cm as the electrode pilot region as sacrificial anode material from a looking somebody up and down, and exposed area is 1.5532cm
2, up more than the test solution liquid level, prevent to produce water-line corrosion when testing with epoxy sealing, influence test result, pilot region is polished behind the scale removal, with acetone, anhydrous alcohol clean surface, remove greasy dirt and moisture, place exsiccator stand-by.
Experimental technique: No. 20 steel test pieces, auxiliary electrode are inserted in the electrolytic cell, and reference electrode is put into the shell type salt bridge.The handshaking procedures of salt bridge is as follows: earlier solution to be measured is drawn into the outer sleeve of salt bridge and is full of it from the latex mouth of pipe by ear-cleaning ball; Getting the saturated KCl solution of 3mL is injected in the inner sleeve of salt bridge; Reference electrode is inserted with earlier in the latex mouth of pipe, fills in the inner sleeve of salt bridge then together and make it tight; Make interior hole solution unlikely by negative pressure by the leakage of porous core.
Adopt electrokinetic potential scanning polarization curve to measure the polarization curve of No. 20 steel test pieces of test method measuring, connect power supply before the experiment and made the instrument preheating 20 minutes, and three-electrode system and corrosion test system are connected.The test face of No. 20 steel test pieces of process polishing is immersed 0.5-1cm under the reusing sewage circulating water liquid level, place water-bath to keep 40 ℃ of temperature.Place after 10 minutes, treat to begin to carry out zeta potential scanning after No. 20 steel test pieces reach stable corrosion potential.Open analogue low pass filtering and the digital filtering of potentiostat in being provided with, be set at 20 seconds retard time.No. 20 steel test pieces are provided with initial potential, and the termination current potential is 800mV (homogeneous phase is to OCP), and scanning speed is 3mV/s.
Adopt the polarization curve of electrokinetic potential scanning polarization curve measurement test method measuring magnesium alloy anode sample identical with No. 20 steel test pieces, the magnesium alloy anode sample is provided with initial potential, the termination current potential is 100mV (homogeneous phase is to OCP), and scanning speed is 3mV/s.
With the matched curve of the Corrtest electro-chemical test Cview of system software, draw protection potential and protective current density.
Experimental result: experimental result is seen Fig. 5; Fig. 5 is the polarization curve after 40 ℃ of following No. 20 steel and the match of magnesium alloy anode in reusing sewage circulating water; from the polarization curve of No. 20 steel and magnesium alloy anode as can be seen; article two, the intersection point of polarization curve is minimum protective potential and minimum protective current; wherein; minimum protective potential is-1.412V (with respect to saturated calomel electrode) that minimum protective current density is 2564.2 μ A/cm
2
2, measure operating potential and weightlessness
Experimental drug: commercially available acetone and anhydrous alcohol (be and analyze alcohol, chemical reagent factory in Xi'an produces), reusing sewage circulating water.
Laboratory apparatus: the saturated CuSO of portable Cu/
4Reference electrode (special antiseptic project Co., Ltd of Shandong Dongying section), TG328A type analysis balance (Shanghai balance equipment factory), HHS-4B electric-heated thermostatic water bath (mayor of Beijing bearing instruments and meters company), novel palm digital multimeter UT33D (the permanent Kodak detecting instrument in Shenzhen Co., Ltd).
The preparation sample: No. 20 steel that will process partly cut open the pipe sample, and (specification is that Φ 19mm * 2mm * 50mm) adopts that chemical method eliminates rust, Ex-all, use distilled water flushing, with acetone, anhydrous alcohol clean surface, remove greasy dirt and moisture, place exsiccator stand-by.Lead is drawn in welding at the hanging hole place, magnesium alloy anode bending back will be connected with the test tube of handling well, will make it and away from an end conducting of hanging hole, with hanging hole end insulation processing, the work area of 2cm length is reserved in the centre, remaining part and wiring tie point epoxy sealing.
(1) test method: get 4 in No. 20 steel test tubes having prepared, be numbered 1,2, No. 3 No. 20 steel test tubes and soak, another No. 20 steel test tubes are the blank sample.Be numbered 1,2, No. 3 No. 20 steel test tubes respectively with the saturated CuSO of Cu/
4The lead that reference electrode is drawn links to each other with digital multimeter, and constant temperature soaked 15 days down for 40 ℃, write down potential value every day.No. 20 steel test tubes before and after soaking and magnesium alloy anode sample are removed corrosion products, weigh after the drying process, be calculated as follows out corrosion rate.
In the formula for υ is a corrosion rate, g/ (m
2H) (if be converted into mm/a, need multiply by 8.76/ ρ, ρ is the density of material, and the density of iron is got 7.85g/cm
3, W
0Be initial weight (g), W
1For having cleaned the weight behind the corrosion products (g), S is the exposed area (m of sample
2), the time that t carries out for corrosion (hour).
The blank sample does not carry out immersion test.
(2) experimental result
Operating potential: No. 20 steel test tubes current potential in effluent cycle water separately are-0.730V.No. 20 steel test tubes and the saturated CuSO of Cu/ with gained
4The data of reference electrode be depicted as electrode potential in time change curve see shown in Fig. 6 a, Fig. 6 b, Fig. 6 c, Fig. 6 a is numbered 1 No. 20 steel test tube electrode potentials change curve in time, Fig. 6 b is numbered 2 No. 20 steel test tube electrode potentials change curve in time, and Fig. 6 c is numbered 3 No. 20 steel test tube electrode potentials change curve in time.As shown in Figure 6, the current potential of No. 20 steel test tubes tends towards stability ,-1.200～-1.350V between fluctuation (with respect to saturated CuSO
4Electrode).Operating potential is in the normal scope, can carry out anti-corrosion protection effectively to protected No. 20 steel test tubes, and No. 20 steel test tubes have obtained the protection of magnesium alloy anode.
Weightless mensuration: No. 20 there is one deck grey black look rete on steel test tube surface, more easily removes, and rusty scale do not occur.Weightless the m '=0.00136g of blank test tube weighs after the processing, and the corrosion rate that draws No. 20 steel test tubes is 0.0331mm/a, and experimental result sees Table 1.
No. 20 steel test tubes of table 1 record chart of weighing
| Sequence number | Quality m before soaking 0(g) | Soak back quality m 1(g) | Weightless Δ m=m 0-m 1-m’ | Corrosion rate (mm/a) |
| ??1 | ??20.02406 | ??20.00522 | ??0.01748 | ??0.0325 |
| ??2 | ??20.37845 | ??20.34729 | ??0.01116 | ??0.0311 |
| ??3 | ??20.53760 | ??20.50270 | ??0.01490 | ??0.0356 |
As shown in Table 1, the corrosion rate of No. 20 steel test tubes is less, obtained effective protection of magnesium alloy anode, but anode consumption is very fast, protection degree Z=75.11%.
3, conclusion
(1) measured as can be known by corrosion potential and protection potential: the minimum protective potential when No. 20 steel adopts the magnesium alloy anode protection is-1.412V that minimum protective current density is 2564.2 μ A/cm
2(with respect to saturated calomel electrode).
(2) by operating potential and weightless mensuration as can be known: with magnesium alloy as No. 20 steel test tubes of anode loss protection, its operating potential-1.200～-1.350V between (with respect to saturated CuSO
4Electrode);
The corrosion rate of (3) No. 20 steel is 0.0331mm/a, and the protection degree is 75.11%, and magnesium alloy anode has played protective action.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101360491A CN101818816B (en) | 2010-03-30 | 2010-03-30 | Cathodic protection corrosion-proof valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101360491A CN101818816B (en) | 2010-03-30 | 2010-03-30 | Cathodic protection corrosion-proof valve |
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| Publication Number | Publication Date |
|---|---|
| CN101818816A true CN101818816A (en) | 2010-09-01 |
| CN101818816B CN101818816B (en) | 2012-07-04 |
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|---|---|---|---|
| CN2010101360491A Expired - Fee Related CN101818816B (en) | 2010-03-30 | 2010-03-30 | Cathodic protection corrosion-proof valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2536306C2 (en) * | 2012-11-28 | 2014-12-20 | Закрытое акционерное общество "Научно-производственная фирма "Центральное конструкторское бюро арматуростроения" | Device and method for electrochemical production of pipeline valves against internal corrosion |
| CN110226062A (en) * | 2017-01-26 | 2019-09-10 | 费森尤斯医疗保健控股公司 | Check-valves and the method for forming check-valves |
| CN112746597A (en) * | 2020-12-30 | 2021-05-04 | 贵阳市水利水电勘测设计研究院有限公司 | Dam system of high water level |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2148229Y (en) * | 1993-02-26 | 1993-12-01 | 湖北省沙市市阀门总厂 | Metal hard seal butterfly valve |
| JPH0681974A (en) * | 1992-09-07 | 1994-03-22 | Toshiba Corp | Stainless steel seawater valve |
| JPH08128536A (en) * | 1994-11-02 | 1996-05-21 | Kubota Corp | Butterfly valve |
| WO1999047838A1 (en) * | 1998-03-19 | 1999-09-23 | Snap-Tite Technologies, Inc. | Piston valve |
-
2010
- 2010-03-30 CN CN2010101360491A patent/CN101818816B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681974A (en) * | 1992-09-07 | 1994-03-22 | Toshiba Corp | Stainless steel seawater valve |
| CN2148229Y (en) * | 1993-02-26 | 1993-12-01 | 湖北省沙市市阀门总厂 | Metal hard seal butterfly valve |
| JPH08128536A (en) * | 1994-11-02 | 1996-05-21 | Kubota Corp | Butterfly valve |
| WO1999047838A1 (en) * | 1998-03-19 | 1999-09-23 | Snap-Tite Technologies, Inc. | Piston valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2536306C2 (en) * | 2012-11-28 | 2014-12-20 | Закрытое акционерное общество "Научно-производственная фирма "Центральное конструкторское бюро арматуростроения" | Device and method for electrochemical production of pipeline valves against internal corrosion |
| CN110226062A (en) * | 2017-01-26 | 2019-09-10 | 费森尤斯医疗保健控股公司 | Check-valves and the method for forming check-valves |
| CN110226062B (en) * | 2017-01-26 | 2021-09-21 | 费森尤斯医疗保健控股公司 | Check valve and method of forming a check valve |
| CN112746597A (en) * | 2020-12-30 | 2021-05-04 | 贵阳市水利水电勘测设计研究院有限公司 | Dam system of high water level |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101818816B (en) | 2012-07-04 |
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