JP2004353759A - Allophone dissolution method of disc valve and cock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the adhesion of metallic ion or salt to a sliding surface of valve bodies and to prevent abnormal noise from occurring in sliding. <P>SOLUTION: In a disk valve, one valve element 20 of valve elements 20, 30 sliding with each other forms a sliding surface 21 by coating diamond-like hard carbon film at the surface. The other valve element 30 consists of alumina (Al<SB>2</SB>O<SB>3</SB>) as a principal constituent and ceramics containing Ti. The other valve element 30 is within the range of 10<SP>4</SP>to 10<SP>11</SP>Ω/square in surface resistance of sliding surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００４４】
この結果、本発明の固定弁体３０を用いた試料Ｎｏ．３〜７では、１０万回以上摺動させても異音やトルク上昇がなく、長期間にわたって滑らかな摺動特性を得ることができたが、試料Ｎｏ．１，２では１万回目で異音が発生し、固定弁体の表面抵抗が高い試料Ｎｏ．８では１０万回目で異音が発生した。
【００４５】
また、上記試料Ｎｏ．５について、可動弁体２０（アルミナ＋ＤＬＣ）の表面の算術平均粗さ（Ｒａ）は０．１２μｍと固定した。また、固定弁体３０の体積固有抵抗の表面抵抗は１０^４〜１０^５Ω／□の間に固定した。そして、固定弁体の算術平均粗さ（Ｒａ）を種々変えたときの水のリークの有無を測定した。その結果を表２に示す。ここで、水のリークとは、１０万回摺動後に、水栓内のディスクバルブを組み込むカートリッジの隙間から水がしみ出て、水栓の外側まで水が伝って染み出ることをいう。
【表２】

表２から、固定弁体の算術平均粗さ（Ｒａ）が０．２μｍ以下であると、シール性が高まり、水漏れがなくなるのがわかる。
【００４６】
【発明の効果】
以上のように、本発明によれば、互いに摺動する２枚の弁体のうち少なくと一方の弁体の表面に中間層を介してダイヤモンド状硬質炭素膜を被着して摺接面を形成し、且つ他方の弁体を形成するセラミックスの主成分がアルミナ（Ａｌ_２Ｏ_３）からなり且つ他方の弁体における摺接面の表面抵抗を１０^４〜１０^１１Ω／□の範囲とすることにより、水中における金属イオンまたは塩類の付着を低減させ、摺動時における異音の発生をなくすことができるという効果がある。
また、本発明のディスクバルブは、上記他方の弁体における摺接面の算術平均粗さ（Ｒａ）を０．２μｍ以下とすることにより、シール性を高めても漏れや異音のないディスクバルブを得ることが可能となる。
さらに本発明のディスクバルブは、上記一方の弁体に被着したダイヤモンド硬質炭素膜の摺接面の表面抵抗が１０^２〜１０^１２Ω／□の範囲としたことにより、両者に導電性があることから、摺接界面から静電気を容易に除去することが可能となる為、金属イオンまたは塩類の付着を低減させ、摺動時における異音の発生をなくすことがより可能となる。
【図面の簡単な説明】
【図１】本発明のディスクバルブの一実施形態を示す斜視図である。
【図２】図１において弁体を分離した状態を示す分解斜視図である。
【図３】可動弁体の構造を示す拡大断面図である。
【符号の説明】
２０ 可動弁体
２１ 摺接面
３０ 固定弁体
３１ 摺接面
２２ 流体通路
３２ 流体通路
２３ 中間層
２４ ダイヤモンド状硬質炭素膜[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disc valve comprising a movable valve body and a fixed valve body which constitute a faucet (such as a hot / cold water faucet) including a single lever mixer tap and a thermostatic mixer tap, and a lever of the faucet is operated using the disc valve. The present invention relates to a method for eliminating abnormal noise of a faucet generated at the time.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a disc valve used for a faucet such as a hot and cold water mixing faucet is formed by sliding two disc-shaped valve bodies (a movable valve body and a fixed valve body) in sliding contact with each other. A fluid passage formed in each valve body is opened and closed. Further, since this type of disc valve is used in a state of being constantly rubbed with each other, a valve body constituting the disc valve has been formed of ceramics having excellent wear resistance and corrosion resistance.
Further, the disk valve has been used with a lubricant such as grease interposed on a sliding surface in order to reduce the operating force between the valve bodies.
[0003]
However, in the case of a disc valve using a lubricant, the lubricant on the sliding surfaces flows out in a relatively short period of time due to sliding of the valve bodies and becomes non-lubricated. As a result, there has been a problem that the operating force of the lever gradually increases, and finally, linking (adhesion) occurs in which the valve bodies stick to each other and do not move. In addition, depending on the type of the lubricant, the lubricant may deteriorate during long-term use or adhere to dirt, thereby deteriorating the sliding characteristics. Was.
[0004]
Therefore, in recent years, a disk valve having a self-lubricating property on a sliding surface of at least one of the valve bodies that slide with each other and a diamond-like hard carbon film having excellent wear resistance is applied. It has been proposed (see Patent Documents 1 and 2).
Due to the excellent self-lubricating action of the diamond-like hard carbon film, stable sliding characteristics can be maintained for a long period of time without linking despite the non-lubricated state.
[0005]
[Patent Document 1] JP-A-3-223190 [Patent Document 2] JP-A-9-292039
[Problems to be solved by the invention]
In particular, in recent years, faucets have been required to have high sealing properties, and the number of valve bodies having mirror surfaces each having, for example, an arithmetic average roughness (Ra) of 0.2 μm or less is increasing. In particular, the situation in which a diamond-like hard carbon film must be applied to a mirror-like base material as disclosed in Patent Document 2 is increasing.
[0007]
However, in the case of a disc valve composed of a valve element having a diamond-like hard carbon film attached thereto and a valve element not having the element attached, a general tap water which contains a large amount of metal ions such as Ca and Fe in discharged water. When water is inserted, metal components and calcium carbonate adhere to the valve body surface where the diamond-like hard carbon film is not adhered, and when the valve bodies slide with each other, It becomes a sliding contact surface that originally impaired the low friction property of the diamond-like hard carbon film, and furthermore, the frictional resistance increases due to the addition of sliding on the attached matter, which causes micro vibration between the valve bodies, There is a problem that abnormal noise is generated.
[0008]
In particular, when the fixed valve body has a larger area than the movable valve body and a diamond-like hard carbon film is applied to the surface of the movable valve body, these phenomena are likely to occur on the surface of the fixed valve body. The edge portion of the movable valve body moves on the fixed valve body like a wiper of a car, and metal components, calcium carbonate, and the like easily adhere and accumulate at the end of the movable range of the movable valve body.
That is, according to a mapping result obtained by performing plane analysis of Ca and C (carbon) by X-ray micro-analysis (EPMA) of an energy dispersive scanning electron microscope (SEM), according to the mapping results, It was found that the substance was an adhering substance, from which it is presumed that calcium carbonate was deposited.
[0009]
The reason for this is that the higher the sealing performance of the sliding surfaces between the valve bodies, the smaller the proportion of water present at the sliding contact interface, and only the valve bodies gradually exist. When the valve bodies slide in such a state, static electricity is generated at the sliding interface because the valve bodies are made of an insulating material. In general, water acts as a conductor to release static electricity, albeit weak, but since there is almost no water at the sliding interface, it induces adhesion of metallic components and impurities such as calcium carbonate on the valve body surface. It is thought that it was done.
[0010]
Therefore, the present invention reduces the adhesion of metal components, calcium carbonate, and the like to the sliding contact surface, eliminates the generation of abnormal noise, and can maintain smooth sliding even after long-term use. An object of the present invention is to provide a valve and a method for eliminating abnormal noise of a faucet using the same.
[0011]
[Means for Solving the Problems]
A disk valve according to the present invention for solving the above-mentioned problems comprises a pair of valve bodies that slide with respect to each other, one of which has a diamond-like hard carbon film formed on its surface to form a sliding contact surface. The other valve body is made of ceramics containing alumina (Al ₂ O ₃ ) as a main component, and has a surface resistance of a sliding contact surface in a range of 10 ⁴ to 10 ¹¹ Ω / □. .
[0012]
Further, the disc valve of the present invention is characterized in that the arithmetic mean roughness (Ra) of the sliding surface of the other valve body is 0.2 μm or less.
Further, the disc valve of the present invention is characterized in that the surface resistance of the sliding surface of the diamond hard carbon film adhered to the one valve body is in the range of 10 ² to 10 ¹² Ω / □.
[0013]
By making the sliding contact surface of the other valve body conductive or semi-conductive with a surface resistance in the range of 10 ² to 10 ¹⁰ Ω / □, adhesion of metal ions or salts in water is reduced, and sliding is performed. It has become possible to eliminate the occurrence of abnormal noise at the time. In addition, by combining with a diamond-like hard carbon film, smooth sliding can be maintained even when used for a long time. In particular, when a conductive diamond-like hard carbon film is used, since both are conductive, static electricity can be more easily removed.
[0014]
Therefore, the present invention also provides a method for eliminating abnormal noise of a faucet, characterized by using the above-mentioned disc valve to reduce abnormal noise generated when the valve bodies slide.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing an embodiment of the disc valve of the present invention, and FIG. 2 is an exploded perspective view thereof.
[0016]
The movable valve body 20 has a disk shape having a fluid passage 22 penetrating through the upper and lower surfaces, and is formed of an alumina-based sintered body. As shown in FIG. The sliding surface 21 is formed by applying a diamond-like hard carbon film 24.
[0017]
The fixed valve body 30 includes a fluid passage 32 penetrating the upper and lower surfaces and two fluid discharge ports 33a and 33b (for example, a hot water discharge port and a water discharge port), and is formed in a disk shape larger than the movable valve body 20. , The surface resistance of the sliding contact surface 31 is in the range of 10 ⁴ to 10 ¹¹ Ω / □.
[0018]
The sliding surfaces 21, 31 of the respective valve elements 20, 30 have a flatness of 1 μm or less to prevent water leakage, and a surface roughness of 0.2 μm or less in arithmetic average roughness (Ra). is there.
[0019]
The movable valve body 20 and the fixed valve body 30 are brought into close contact with each other in a non-lubricated state with their sliding contact surfaces 21 and 31, and a lever (not shown) is moved to move the movable valve body 20 with an arrow in FIG. By opening and closing the fluid passages 22 and 32 provided in the valve bodies 20 and 30 by sliding in the directions indicated by, the flow rate of the supply fluid is adjusted, and the opening degrees of the fluid discharge ports 33a and 33b are adjusted. It has become.
[0020]
At this time, since the diamond-like hard carbon film 24 having excellent self-lubricating properties and high hardness is applied to the sliding contact surface 21 of the movable valve body 20, the fixed valve body 30 is provided despite the non-lubricated state. Can be smoothly slid by reducing the lever operation force without causing abrasion of the lever.
[0021]
Further, it is preferable that both of the sliding contact surfaces 21 and 31 are smooth surfaces having an arithmetic average roughness (Ra) of 0.2 μm or less. When the arithmetic average roughness (Ra) is 0.2 μm or less, the sealing property can be improved, and the friction coefficient can be reduced by the diamond-like hard carbon film 24. Generation can be effectively prevented, and sliding can be performed smoothly over a long period of time. Here, the arithmetic average roughness (Ra) may be measured according to JIS B0601, using a surface roughness measuring device such as Surfcoder SE-2300 manufactured by Kosaka Laboratory Co., Ltd.
[0022]
Particularly preferably, the sliding contact surfaces 21 and 31 of the two valve elements 20 and 30 have an arithmetic average roughness (Ra) of 0.12 μm or less, more preferably 0.1 μm or less, and have a flatness of 1 μm or less. Good. If the surface condition of the sliding surfaces 21 and 31 of the two valve bodies 20 and 30 becomes rough beyond the above-described range, a large water pressure is applied between the valve bodies 20 and 30 particularly in the case where a water purifier is assembled. This is because water leakage may occur. Here, the flatness may be measured according to JIS B0621 using an optical flat inspection and measurement device manufactured by Nikon Corporation.
[0023]
Further, the surface resistance of the sliding contact surface 31 of the fixed valve body 30 is preferably in the range of 10 ⁴ to 10 ¹¹ Ω / □, and more preferably in the range of 10 ⁵ to 10 ⁸ Ω / □. It is possible to reduce the adhesion of the noise and eliminate the occurrence of abnormal noise during sliding. Further, the sealing property between the sliding contact surfaces 21 and 31 is enhanced, and water does not intervene at the sliding contact interface. That is, even if static electricity is generated at the sliding contact interface due to sliding between the valve bodies 20 and 30, the static electricity can be released from a portion other than the sliding contact interface of the valve bodies 20 and 30 that comes into contact with water. It is possible to reduce the adhesion of impurities such as metal components and calcium carbonate to the surface of the substrate 30. Here, the surface resistance can be measured by a super insulation resistance meter specified in JIS-C2141.
[0024]
The ceramics forming the fixed valve body 30 need to contain alumina (Al ₂ O ₃ ) as a main component and contain at least one selected from Ti, Fe, V, Nb, and Ta.
[0025]
In order to produce such ceramics, alumina (Al ₂ O ₃ ) purity of 96% or more and alumina particles having an average particle diameter of 1 to 2 μm are prepared as starting materials, and SiO ₂ , MgO, CaO, and A sintering aid of one or more oxides selected from Ti, Fe, V, Nb, and Ta and an organic additive are added, mixed and pulverized in a wet state, and then dried and formed by a spray drier. Granulation is performed to produce a secondary material. The obtained secondary material is filled in a mold and formed into a predetermined shape at a pressure in the range of 80 to 200 MPa. Next, firing is performed so that the maximum temperature is in the range of 1500 to 1700 ° C. Next, thickness grinding is performed using a double-headed grinding machine to finish the surface in a predetermined state. Then, it is baked at 900 to 1400 ° C. in a reducing furnace in a nitrogen atmosphere, and after performing a reduction treatment, it is finished to a final product surface state.
[0026]
At this time, the total amount of any one or more oxides selected from Ti, Fe, V, Nb, and Ta is preferably in the range of 1 to 5% by weight based on the total weight of the sintered body. If the amount is less than 1% by weight, a predetermined conductivity cannot be obtained. On the other hand, if the total amount of the above oxides is more than 5% by weight, the strength of the porcelain is impaired, and the heat shock property is reduced. In particular, when used in a hot and cold water mixing tap, a disk valve having a complicated shape is easily damaged and becomes a problem as a product. Therefore, the total amount of the above oxides is preferably in the range of 1 to 5% by weight, and more preferably in the range of 3 to 4% by weight.
[0027]
Alternatively, in addition to the method of once firing and then refiring in a reducing atmosphere, a method of reducing and firing in a nitrogen atmosphere at 1500 to 1700 ° C. from the beginning may be used. In that case, a sufficient degreasing step is required before firing.
[0028]
The ceramic of the fixed valve body 30 according to the present invention is baked in a reducing atmosphere, whereby oxygen of one or more oxides selected from Ti, Fe, V, Nb, and Ta in the ceramic is deficient, and metal By being a component, conductivity can be imparted. In addition, since the effect of conductivity can be obtained even if the content of the metal oxide is not too large, ceramics can be manufactured without deteriorating material characteristics. That is, since the fixed valve body 30 does not impair the material properties such as the strength surface, the hardness surface, and the rigidity, it is possible to obtain an excellent disk valve having good heat shock properties and good wear resistance.
[0029]
On the other hand, the diamond-like hard carbon film 24 formed on the movable valve body 20 is substantially made of carbon and may have some crystallinity, but basically has an amorphous structure. It has a different composition from diamond, cubic boron nitride (cBN), and hexagonal boron nitride (hBN) having a crystal structure.
[0030]
When this diamond-like hard carbon film 24 is examined using a Raman spectrometer that is often used for identifying graphite and diamond, the diamond-like hard carbon film 24 is located near the diamond peak position of 1333 cm ⁻¹ and the graphite peak position of 1550 cm ⁻¹ . Each has a peak. The peak of the diamond-like hard carbon film 24 used in the disk valve of the present invention may be biased toward either diamond or graphite, and is preferably biased toward the diamond peak position.
Such a diamond-like hard carbon film 24 has a Vickers hardness (Hv 1.0) of 20 to 50 GPa, which is very hard, so that it hardly wears even when sliding with the fixed valve body 30. .
[0031]
Further, the diamond-like hard carbon film 24 may contain silicon and at least one metal selected from zirconium, tungsten and titanium. As described above, by containing at least one metal among zirconium, tungsten, and titanium and silicon, the residual stress inside the film can be reduced and the bonding force can be increased. Therefore, it is possible to make the adhesive force with the movable valve body 20 stronger, and to form a film having a high Vickers hardness (Hv 1.0) of 55 GPa or more. In addition, the diamond-like hard carbon film 24 containing at least one metal of zirconium, tungsten, and titanium and silicon is different from the diamond-like hard carbon film 24 that does not contain these components and is measured by a Raman spectrometer. Has one peak near 1480 cm ^-1 .
[0032]
The intermediate layer 23 used to increase the adhesion between the movable valve body 20 and the diamond-like hard carbon film 24 is not particularly limited as long as it can increase the adhesion between the two. An intermediate layer 23 in which a Ti film and a Si film are stacked in this order from the movable valve body 20 side, an SiC film, a SiO ₂ film, or the like may be used.
[0033]
In particular, if a conductive material is used for the intermediate layer 23, the surface resistance of the sliding contact surface 21 of the diamond-like hard carbon film 24 can be in the range of 10 ² to 10 ¹² Ω / □, and more preferably, As the layer, an intermediate layer 23 in which a conductive Ti film and a Si film are laminated in this order, or an SiC film is used, and the surface resistance of the surface layer is set to be in a range of 10 ² to 10 ⁶ Ω / □. Since the valve bodies 20 and 30 do not become insulators, even if static electricity is generated when sliding, static electricity can be released from the sliding contact interface.
[0034]
As a means for applying the diamond-like hard carbon film 24 and the intermediate layer 23 to the movable valve body 20, a thin film forming means such as a sputtering method, an ion plating method, a PVD method, and a CVD method can be used. In order to deposit by a plasma CVD method which can form a film at a low temperature, first, a source gas and a carrier gas for depositing each film are supplied into a chamber, and a cathode (anode) on which a movable valve body 20 is disposed. By applying a voltage between the electrode and the anode (cathode) electrode, electrons extracted from the cathode (anode) electrode collide with the source gas and the carrier gas to generate plasma, and the source gas component in the plasma is movable. What is necessary is just to deposit on the surface of the valve body 20. Then, by replacing the source gas and the carrier gas supplied to the chamber chamber, the film can be formed by applying the Ti film, the Si film, and the diamond-like hard carbon film 24 in this order from the surface side of the movable valve body 20.
[0035]
Further, it is preferable that the movable valve body 20 for covering the diamond-like hard carbon film 24 and the intermediate layer 23 is formed of a ceramic sintered body. That is, when the movable valve body 20 is formed of resin, the diamond-like hard carbon film 24 cannot be applied, and when the movable valve body 20 is formed of metal, the hardness is smaller than that of the ceramic sintered body. This is because the diamond-like hard carbon film 24 that is deformed by the pressing force against the body 30 and adheres to the surface may be damaged.
[0036]
On the other hand, since the ceramic sintered body has high hardness, it is not deformed by the pressing force with the fixed valve body 30, so that the diamond-like hard carbon film 24 adhered to the surface thereof is not damaged, In addition, since high processing accuracy is obtained, the surface of the movable valve body 20 is finished to a smooth surface, and the surface of the diamond-like hard carbon film 24 adhered to the surface is smooth and flat following the surface of the movable valve body 20. Surface.
[0037]
The ceramic sintered body forming the movable valve body 20 is preferably made of a ceramic sintered body containing alumina as a main component. Since the alumina sintered body has a Young's modulus of 250 to 400 GPa and a Vickers hardness (Hv 1.0) of more than 12 GPa, the sliding contact surface 21 can be formed even when the pressing force with the fixed valve body 30 is increased. It is possible to provide a disk valve that can be used for a long period of time because it is not deformed and has excellent chemical resistance.
[0038]
In the above embodiment of the present invention, the main component of the ceramic forming the fixed valve body 30 is made of alumina (Al ₂ O ₃ ), and the surface resistance of the sliding contact surface is in the range of 10 ⁴ to 10 ¹¹ Ω / □. Although the disk valve in which the diamond-like hard carbon film 24 is applied to the movable valve body 20 has been described, the same applies to the case where the material of the fixed valve body 30 and the movable valve body 20 are reversed. Needless to say, the effect can be obtained.
[0039]
【Example】
Hereinafter, examples of the present invention will be described.
[0040]
The disk valve shown in FIG. 1 was manufactured by changing the surface resistance of the fixed valve body 30, and the sliding characteristics of the disk valve were examined.
The movable valve body 20 is made of an alumina sintered body having an Al ₂ O ₃ purity of 96%. The one to which the carbon film 24 (DLC) was applied was used (samples Nos. 3 to 8 shown in Table 1). Further, as shown in Table 1, the sample No. The alumina-based sintered body was used as it was for the movable valve bodies 1 and 2. In addition, the movable valve body 20 was a substantially disk-shaped body having an outer diameter of 25 mm and a thickness of 5 mm.
[0041]
The fixed valve body 30 was made of an alumina sintered body and had a surface resistance changed as shown in Table 1. The surface resistance was adjusted by changing the amount of TiO ₂ added to Al ₂ O ₃ and / or the conditions (temperature and time) for the reduction treatment in a nitrogen atmosphere. The fixed valve body 30 was a substantially disk-shaped body having an outer diameter of 32 mm and a thickness of 5 mm. The surface resistance was measured in accordance with JIS K-6911 for a high resistance region of 10 ⁶ Ω or more, and was measured in accordance with JIS K-7194 for a low resistance region of 10 ⁶ Ω or less. Things.
The sliding surfaces 21 and 31 of both valve bodies 20 and 30 were polished to have a flatness of 1 μm or less and a surface roughness of 0.2 μm or less in terms of arithmetic average roughness (Ra).
[0042]
The two valve bodies 20 and 30 formed in this manner are set on a water tap while being pressed by a casing with an axial force of 294 N so that the sliding surfaces 21 and 31 are in contact with each other. Under a state of injection at a pressure of 098 MPa, a lever pressing force (torque) required for operating the operation lever was measured with a push-pull gauge, and the number of sliding operations at which the torque increased was measured. Here, the increase in torque means that the load when the lever of the faucet is moved up and down exceeds 10 N.
[0043]
In addition, the occurrence of abnormal noise when sliding 100,000 times was examined. Here, the abnormal sound is a sound that a person with normal hearing heard at a position 30 cm away from the running faucet and that confirmed an unpleasant sound such as squeaking.
Table 1 shows the evaluation results.
[Table 1]

[0044]
As a result, the sample No. using the fixed valve body 30 of the present invention. In Nos. 3 to 7, no abnormal noise and no increase in torque were obtained even after sliding 100,000 times or more, and smooth sliding characteristics could be obtained over a long period. In Nos. 1 and 2, abnormal noise was generated at the 10,000th time, and Sample No. 1 had a high surface resistance of the fixed valve body. In No. 8, abnormal noise occurred at the 100,000th time.
[0045]
The sample No. With respect to 5, the arithmetic mean roughness (Ra) of the surface of the movable valve body 20 (alumina + DLC) was fixed at 0.12 μm. In addition, the surface resistance of the volume specific resistance of the fixed valve body 30 was fixed at 10 ⁴ to 10 ⁵ Ω / □. Then, the presence or absence of water leakage when the arithmetic mean roughness (Ra) of the fixed valve body was changed variously was measured. Table 2 shows the results. Here, the water leak means that after sliding 100,000 times, water seeps out of the gap of the cartridge in which the disc valve is incorporated in the faucet, and penetrates to the outside of the faucet.
[Table 2]

From Table 2, it can be seen that when the arithmetic mean roughness (Ra) of the fixed valve body is 0.2 μm or less, the sealing property is enhanced and water leakage is eliminated.
[0046]
【The invention's effect】
As described above, according to the present invention, a diamond-like hard carbon film is applied to the surface of at least one of the two valve bodies that slide with respect to each other via the intermediate layer to form a sliding contact surface. The main component of the ceramics that forms and forms the other valve body is alumina (Al ₂ O ₃ ), and the surface resistance of the sliding contact surface of the other valve body is in the range of 10 ⁴ to 10 ¹¹ Ω / □. Thereby, there is an effect that adhesion of metal ions or salts in water can be reduced and generation of abnormal noise during sliding can be eliminated.
Further, the disc valve of the present invention has an arithmetic mean roughness (Ra) of the sliding surface of the other valve body of not more than 0.2 μm, so that even if the sealing property is enhanced, there is no leakage or noise. Can be obtained.
Further, in the disk valve of the present invention, since the surface resistance of the sliding surface of the diamond hard carbon film adhered to the one valve body is in the range of 10 ² to 10 ¹² Ω / □, both are conductive. Therefore, since it is possible to easily remove static electricity from the sliding contact interface, it is possible to reduce adhesion of metal ions or salts and to eliminate generation of abnormal noise during sliding.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of a disc valve of the present invention.
FIG. 2 is an exploded perspective view showing a state where a valve body is separated in FIG.
FIG. 3 is an enlarged sectional view showing a structure of a movable valve body.
[Explanation of symbols]
Reference Signs List 20 movable valve body 21 sliding contact surface 30 fixed valve body 31 sliding contact surface 22 fluid passage 32 fluid passage 23 intermediate layer 24 diamond-like hard carbon film

Claims (4)

It is composed of a pair of valve bodies that slide with each other, one of which has a diamond-like hard carbon film formed on its surface to form a sliding contact surface, and the other of which is alumina (Al ₂ O ₃ ). A disk valve comprising a ceramic mainly composed of: and having a surface resistance of a sliding contact surface in a range of 10 ⁴ Ω / □ to 10 ¹¹ Ω / □. 2. The disk valve according to claim 1, wherein the arithmetic mean roughness (Ra) of the sliding surface of the other valve body is 0.2 μm or less. The disk valve according to claim 1, wherein a surface resistance of a sliding surface of the diamond hard carbon film adhered to the one valve body is in a range of 10 ² to 10 ¹² Ω / □. A method for eliminating abnormal noise of a faucet, comprising using the disk valve according to any one of claims 1 to 3 to reduce abnormal noise generated when the valve bodies slide.

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