CN101818816B - Cathodic protection corrosion-proof valve - Google Patents
Cathodic protection corrosion-proof valve Download PDFInfo
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- CN101818816B CN101818816B CN2010101360491A CN201010136049A CN101818816B CN 101818816 B CN101818816 B CN 101818816B CN 2010101360491 A CN2010101360491 A CN 2010101360491A CN 201010136049 A CN201010136049 A CN 201010136049A CN 101818816 B CN101818816 B CN 101818816B
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- anode sheet
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Abstract
The invention discloses a cathodic protection corrosion-proof valve. An inlet a and an outlet b which are communicated with a valve chamber are arranged on a valve body; a gland is arranged on one side of the inlet a on the valve body; a valve rod capable of rotating around an axis thereof is arranged in the valve body; a disc for opening/closing the inlet a is arranged on the valve rod; a filler gland and a filler are arranged between the top end of the valve rod and the valve body; and sacrificial anode plates are arranged on the two sides of the disc respectively. In the valve, because the sacrificial anode plates are arranged on the two sides of the disc respectively, when the valve is used, both the arranged sacrificial anode plates and components to be protected are positioned in liquid, the sacrificial anode plates change into ions to enter the liquid, and lost electrons are transmitted to components in the valve to protect the components. Under the action of the sacrificial anode plates, the components inside the valve are in a cathodic protection state so as to protect valve materials from the corrosion of fluid media, improve the erosion resistance and sealing performance of the valve and prolong 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 now can produce corrosion in various degree, 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 situation all can bring economic loss in various degree.
At present, in existing patented technology, anticorrosion valve commonly used has following three types mostly:
One type is through 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 through 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 rotary threaded 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 processed with stupalith, seal with graphite packing between valve seat and the valve body; And fix by gland, through 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 process, and valve seat adopts graphite to process, and realizes anti-corrosion.
Also have one type to be to add lining or the isolated corrupt liquid of coating at valve internal, the patent No. is 90201262.2 Chinese utility model patent, discloses the anticorrosion valve of a kind of cast stone lining, in valve, sets up the cast stone lining and realizes anti-corrosion; 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: on valve body, be manufactured with import a and outlet b with valve body cavity UNICOM; 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 said import a of switch, is provided with Gland and filler between valve stem tip and the valve body, is 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 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 all was in the liquid with the parts of intending protection, and the sacrificial anode sheet becomes ion and gets into liquid, and the component that the electronics that loses is passed in the valve body give it with protection.Through the effect of sacrificial anode, the parts of valve internal are in cathode protecting state, and the protection valve material does not receive 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 accompanying drawing and embodiment the present invention is explained in further detail, but the invention is not restricted to these embodiments.
Embodiment 1
In Fig. 1, the cathodic protection corrosion-proof valve of present embodiment is made up 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 outlet b of UNICOM in the cavity with valve body 5, valve body 5 upper inlet a one side is equipped with seal ring with the screw threads for fastening coupling gland 7 that has been fixedly connected between gland 7 and the valve body 5; Valve rod 6 radially is installed in the valve body 5; Valve rod 6 can be installed with butterfly plate 8 with two attachment pegs 9 around self axis rotation on valve rod 6, 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, and import a can 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, through 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 through scyewed joint, adjust positioning screwn 2, can butterfly plate 8 be fixed on the fixed position of import a.Valve body 5 upper ends are equipped with block 1 through 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 confirmed by the standard design with the area that requires to protect the material of component and contact with medium according to the medium of being carried.
In the present embodiment; In butterfly plate 8 both sides is the center of circle with the center; Be uniformly distributed with on the circumference of same radius and 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, and 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.
Embodiment 3
In the present embodiment; In butterfly plate 8 both sides is the center of circle with the center; Be uniformly distributed with on the circumference of different radii and be welded with 4 sacrificial anode sheets 10 respectively, be uniformly distributed with on another circumference of different radii and 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.
Embodiment 5
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 following:
Through 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 breaking off through 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 all is in the liquid with component, and 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 gets into 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, does not receive 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, do not receive the corrosion of flowing medium.Through the effect of sacrificial anode, make the component of valve internal be in cathode protecting state, do not receive 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 through cathode protection technology, do not receive 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 existing technology 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 following:
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, and epoxy sealing is used in this face and all the other corners; After dewatering with acetone wiping oil removing, anhydrous alcohol before the experiment; Place exsiccator for use, 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 for use.
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 following: 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 through 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 through negative pressure through the leakage of porous core.
Adopt electrokinetic potential scanning polarization curve experiment with measuring method to measure the polarization curve of No. 20 steel test pieces, energized made the instrument preheating 20 minutes before the experiment, and three-electrode system and corrosion test system are connected.Immerse 0.5-1cm under the reusing sewage circulating water liquid level to the test face of No. 20 steel test pieces of process polishing, 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 experiment with measuring method measurement 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; Can find out that from the polarization curve of No. 20 steel and magnesium alloy anode the intersection point of two polarization curves 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, and with acetone, anhydrous alcohol clean surface, removal greasy dirt and moisture place exsiccator for use.Lead is drawn in welding at the hanging hole place; Magnesium alloy anode bending back is connected with the test tube of handling well, makes 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, and remaining part and wiring tie point are used 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.To No. 20 steel test tubes before and after soaking and magnesium alloy anode sample removal 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.Can know that by Fig. 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, is prone to remove, and rusty scale do not occur.The weightless m of blank test tube ,=0.00136g weighs after the processing, and the corrosion rate that draws No. 20 steel test tubes is 0.0331mm/a, and experimental result is seen table 1.
Table 120 steel test tube weighing and recording table
| 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 |
Can know that by table 1 corrosion rate of No. 20 steel test tubes is less, obtained effective protection of magnesium alloy anode, but anode consumption be very fast, protection degree Z=75.11%.
3, conclusion
(1) measured and 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) can know by operating potential and weightless mensuration: 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 (3)
1. cathodic protection corrosion-proof valve; On valve body (5), be manufactured with and the import (a) of valve body (5) cavity UNICOM and outlet (b), valve body (5) upper inlet (a) side is provided with gland (7), is provided with the valve rod (6) that can rotate around self axis in the valve body (5); Valve rod (6) is provided with the butterfly plate (8) of the said import of switch (a); Butterfly plate (8) bi-side are respectively arranged with sacrificial anode sheet (10), are provided with Gland (3) and filler (4) between valve rod (6) top and the valve body (5), and valve rod (6) upper end is equipped with positioning screwn (2) through scyewed joint; Adjust positioning screwn (2), can butterfly plate (8) be fixed on the fixed position of import (a); Valve body (5) upper end; Through scyewed joint block (1) is installed; Between block (1) and the valve body (5) rubber ring is installed; It is characterized in that: be arranged on sacrificial anode sheet (10) on butterfly plate (8) one sides be installed in butterfly plate (8) center of circle be evenly distributed on same circumference or different circumference on; The number that is arranged on sacrificial anode sheet (10) on sacrificial anode sheet (10) and the side on butterfly plate (8) another side is identical, be arranged on butterfly plate (8) another side center of circle be evenly distributed on same circumference or different circumference on.
2. according to the described cathodic protection corrosion-proof valve of claim 1, it is characterized in that: said sacrificial anode sheet (10) be shaped as circle or rectangle.
3. according to the described cathodic protection corrosion-proof valve of claim 1, it is characterized in that: said sacrificial anode sheet (10) is magnesium alloy anode sheet or zinc alloy anode sheet or aluminum alloy anode sheet.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101818816A CN101818816A (en) | 2010-09-01 |
| CN101818816B true CN101818816B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101360491A Expired - Fee Related CN101818816B (en) | 2010-03-30 | 2010-03-30 | Cathodic protection corrosion-proof valve |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| US10330209B2 (en) * | 2017-01-26 | 2019-06-25 | Fresenius Medical Care Holdings, Inc. | Check valve and method of forming a check valve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3253695B2 (en) * | 1992-09-07 | 2002-02-04 | 株式会社東芝 | 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 |
| US5971007A (en) * | 1998-03-19 | 1999-10-26 | Snap-Tite Technologies, Inc. | Piston valve |
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