JPH10169803A - Valve body and valve seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve body and a valve seat of a valve system which show no anisotropy in a contraction ratio at the time of molding, sufficient self-lubricancy, excellent abrasion resistance on sliding surfaces, hard-to damage even if the foreign materials infiltrate between their sliding contact surface, and excellent water tightness for long-time continuous use. SOLUTION: A valve body 7 is superposed on a valve seat 5 having a valve hole 6. The valve body 7 is slid against the valve seat 5 for opening and closing the valve hole 6. In such a valve system, at least one of the valve seat 5 and the valve body 7 is made of underwater slidable resin component which is prepared by adding glass carbon with means grain diameter 3 to 30 micrometers by 40 to 165 parts by weight, preferably fluorine contained resin powder such as tetrafluoroethylene resin by 1 to 30 parts by weight, to polycyano aryl ether resin 100 parts by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body used for a slide type valve device such as a mixing faucet for hot / cold water, a flow switching plug for a hot water washer for a toilet bowl, and a switching plug for an ion water conditioner. In particular, the present invention relates to a valve element and a valve seat made of an underwater slidable resin composition.

[0002]

2. Description of the Related Art As sliding parts in water, there are known sliding-type valve devices such as a mixing faucet for hot / cold water, a flow switching faucet for a hot water washer for toilet bowls, and a switching faucet for an ion water conditioner. Have been.

For example, as a slide type valve device for mixing hot water and water, a valve device having a structure shown in FIGS.
This is a slide type valve device for mixing hot and cold water, wherein two annular packings 3 are attached to a bottom plate 2 attached to a lower portion of a valve box 1, and the inside of each is a hot water or water inflow port 4. Two valve holes 6 communicating with the respective inlets 4 are formed in a valve seat 5 provided above, and a lever holder 8 is rotatably mounted on a valve body 7, and slides through a pin 9 to this. The lower end of the freely supported lever shaft 10 is connected to a state in which the lower end is fitted into a rectangular recess 11 on the upper surface of the valve body 7, and the valve body 7 is swung up and down and right and left so that the valve body 7 is seated on the seat surface of the valve seat 5. 13 so as to slide the two valve holes 6 respectively or both valve holes 6, 6
Are opened and closed at the same time.

When the valve hole 7 is opened by operating the valve body 7,
Hot water and water supplied to the two inflow ports 4 respectively are supplied to the valve holes 6.
Flow into the mixing chamber 15 from the bottom of the valve element 7 and flow into the mixing chamber 15, and further discharged from the outlet 16 of the mixed water formed on the side wall of the valve box 1 toward the faucet tip. become.

As a resin composition for molding a valve body or a valve seat of such a valve device, a polyphenylene sulfide resin (hereinafter abbreviated as PPS resin) 25 to 80 having excellent creep resistance and lubricating properties is used. JP-A-2-190677 discloses a resin composition comprising 20% to 75% by weight of carbon fibers having an average fiber diameter of 8 μm or less and further containing an inorganic powder filler such as natural mica.

Japanese Patent Application Laid-Open No. 6-213341 discloses a technique for improving the abrasion resistance of the sliding contact surface and preventing the sliding contact surface from being damaged to reduce the water stopping performance. It is disclosed that at least one of the bodies is formed of a resin composition formed by mixing carbon fibers with a polycyano aryl ether resin.

[0007]

However, an underwater slidable resin composition employing a valve body in which a carbon fiber is blended with a polycyanoaryl ether resin has anisotropy in shrinkage during molding and has dimensional accuracy. And the self-lubricating property is not sufficient.

In particular, the conventional valve device described above requires anisotropy of shrinkage during molding, requires high dimensional accuracy, and requires sufficient self-lubricating properties.

Further, such a valve device is required to have abrasion resistance, and does not increase the surface roughness even when foreign matter enters, and suffers from swelling due to water absorption, water pressure, mechanical or thermal shock. It is also necessary to have a property that the flatness is not deviated even if it is present and the water stopping performance is not reduced.

[0010] Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a valve element or a valve seat of a valve device that has no anisotropy in the shrinkage ratio during molding and has good dimensional accuracy. And to have sufficient self-lubricating properties.

During use of such a valve device, the sliding contact surfaces of the valve element and the valve seat have good abrasion resistance, and are hardly damaged even when foreign matter enters the sliding contact surface (scratch resistance). An object of the present invention is to provide an excellent valve device that sufficiently exhibits water-stopping even during continuous use over time.

[0012]

In order to solve the above-mentioned problems, in the present invention, a valve element is superimposed on a valve seat,
In a valve body or a valve seat for a valve device for sliding a valve body with respect to a valve seat, at least one of the valve seat or the valve body is
Glassy carbon having an average particle diameter of 3 to 30 μm is used for 100 parts by weight of the polycyano aryl ether resin.
A valve body or a valve seat characterized by being a molded body of a resin composition containing 165 parts by weight.

In order to solve the same problem as described above, according to the present invention, a valve element or a valve seat for a valve device in which a valve element is overlapped on a valve seat and the valve element is slid with respect to the valve seat, At least one of the valve seat and the valve body is composed of 40 to 165 parts by weight of glassy carbon having an average particle diameter of 3 to 30 μm and 1 to 30 parts by weight of a fluorine-based resin powder based on 100 parts by weight of the polycyanoaryl ether resin. And a valve body or valve seat characterized in that it is a molded product of the resin composition blended in the ratio of

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the polycyano aryl ether resin (hereinafter abbreviated as PEN) in the present invention.
Is a compound comprising a repeating unit represented by the following formula:
Alternatively, it is a polymer in which the repeating unit together with another repeating unit represented by the following formula (2) coexists at a ratio of about 20 mol% or less within a range that does not lose the original properties of PEN.

PEN is a crystalline resin having a melting point of 340.degree. C. and a glass transition temperature of 145.degree.
It is maximum at 40 ° C. Compressive strength is about 2100kgf
/ Cm ² and has good creep resistance. Also,
Since it has excellent hot water resistance in addition to friction and wear characteristics, it is suitable for use as a valve body.

[0016]

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[0017]

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Such a PEN has, for example, a reduced viscosity (ηsp / C) at 60 ° C. of a solution having a concentration of 0.2 g / dl using p-chlorophenol as a solvent of 0.3 dl / C.
g or more are preferable. These are commercially available, for example, from Idemitsu Kosan as polyether nitrile (ID300). The method of manufacturing PEN is disclosed in
As disclosed in Examples of JP-3059, dihalogenobenzonitrile (preferably 2,4-dihalogenobenzonitrile or 2,6-dihalogenobenzonitrile, and halogen is preferably fluorine or chlorine). And an alkali metal salt of resorcinol (preferably sodium or potassium) in a neutral polar solvent to easily prepare it.

The glassy carbon used in the present invention is a glassy carbon (amorphous, ie, amorphous) having no specific crystal structure obtained by carbonizing and firing a phenol resin or a furan resin which is a thermosetting synthetic resin. And having the same degree of hardness (viscosity) as solid carbon), and is usually in powder form.

Commercially available vitreous carbon made from phenol resin powder is a phenol resin having a methylol group in the molecule and having a weight average molecular weight of 3000 or more.
There is a product obtained by firing (heat treatment) at 00 ° C. or 2000 ° C. (manufactured by Kanebo: Bellpearl C-800, manufactured by the company: Bellpearl C-2000), and these have an average particle size of 3 to 3.
Fine particles having a particle size of 0 μm can be used. In addition, as the glassy carbon, the higher the heat treatment temperature, the closer to the graphite structure is obtained.

The average particle size of the glassy carbon used in the present invention is 3 to 30 μm. The reason is that if the particle diameter is less than the above-mentioned predetermined particle size range, the particles tend to agglomerate and it is difficult to uniformly disperse in the matrix, and the desired sliding characteristics cannot be obtained. This is because the aggressiveness increases.

The mixing ratio (parts by weight) of glassy carbon to PEN is 40 to 165 parts by weight of glassy carbon with respect to 100 parts by weight of PEN. Because, when the glassy carbon is less than the above-mentioned predetermined range, the elastic modulus is too small to sufficiently stop the water of the valve body, and when the amount exceeds the predetermined range, the formability is poor and the impact strength is remarkably reduced. Because.

Further, 40 to 165 parts by weight of glassy carbon may be added to 100 parts by weight of PEN, and a fluorine resin powder may be further added. By adding the fluororesin powder, the slidability of the composition is improved, and the operability (handle torque) is reduced when adopted for a valve body or a valve seat of a valve device, and is likely to occur during operation. This is because sliding noise (abnormal noise) can be eliminated.

Typical examples of the above-mentioned fluorine-based resins include the resins listed below. In addition, [] shows the thermal decomposition temperature. Polytetrafluoroethylene (PTFE), [about 5
08 to 538 ° C] tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), [about 464 ° C or more] tetrafluoroethylene-hexafluoropropylene copolymer (FEP), [about 419 ° C or more] polychlorotrifluoro Ethylene (PCTFE)
[About 347 to 418 ° C] Tetrafluoroethylene-ethylene copolymer (ET
FE), [about 347 ° C. or more] chlorotrifluoroethylene-ethylene copolymer (ECTFE), [about 330 ° C. or more] polyvinylidene fluoride (PVDF), [about 4
00 to 475 ° C.] polyvinyl fluoride (PVF), [about 372 to
480 ° C.] tetrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymer (E
PE).

The fluororesin is, for example, a fluorinated polyolefin such as two or more copolymers or terpolymers of the above-mentioned fluororesin monomers in a polymerization amount of about 1:10 to 10: 1. Which exhibit properties as a solid lubricant. Among them, PTFE is
It has excellent properties such as heat resistance, chemical resistance, non-adhesion, and low friction coefficient, and can be said to be preferable.

These fluororesins are also preferred because of their relatively high differential pyrolysis onset temperatures. For example, PTFE, P
The decomposition points of VDF are about 490 ° C. and about 350 ° C., respectively.
It also shows 5 ° C. and about 460 ° C., and among fluororesins, perfluoro-based PTFE, PFA, FEP and the like are preferable because of their excellent high-temperature properties. Therefore, it can relatively withstand the various thermal histories as described above in the process of producing a valve body made of a polycyanoaryl ether resin by melting or the like. In particular, the decomposition point of PTFE is preferable because it is about 100 ° C. higher than the melting point of the polycyanoaryl ether resin (around 340 ° C.). By adding 3 to 30 parts by weight, preferably 5 to 15 parts by weight of these fluororesins, the mechanical properties are excellent, and the compression strength of a standard product or the like is about 2100 kgf / cm.
^In addition to the properties of the polycyanoaryl ether resin having excellent creep resistance and heat insulation properties, hot water resistance and the like at around ² , it is also possible to improve impact resistance, fatigue resistance, wear resistance and the like.

If the addition amount is less than 3 parts by weight, these effects cannot be expected. If the addition amount is more than 30 parts by weight, depending on their melt viscosity or the like, a melt molding machine or the like may be used during granulation or injection molding as described below. The load on the cylinder is large,
In some cases, stable granulation properties, injection moldability, and dimensional accuracy cannot be expected.

Incidentally, the melt viscosities of PFA and FEP are about 10 ⁴ to 10 ⁵ poise and about 4 × at 380 ° C., respectively.
10 ⁴ to 10 ⁵ poise, especially about 34 in PTFE.
It is about 10 ¹¹ to 10 ¹² poise at 0 to 380 ° C., and even at such a high temperature, a fluororesin having a viscosity property of about 10 ⁴ to 10 ¹² poise has a high viscosity property, Excellent heat resistance is preferable.

When PTFE is blended, PEN10
The ratio is 1 to 30 parts by weight with respect to 0 parts by weight. This is because if it exceeds 30 parts by weight, the mechanical properties of PEN are remarkably impaired, and the valve seat or valve body is easily damaged. If the amount is less than 1 part by weight, the effect of improving slidability by adding PTFE cannot be obtained.

The PTFE powder can be used without any particular limitation on its shape and size. However, a PTFE powder having a particle size of 70 μm or less is preferable in order to make the resin composition uniform.

It is preferable to use a recycled PTFE powder instead of the virgin PTFE powder because the mechanical properties of PEN are hardly hindered. Recycled PTFE powder is a powder obtained by baking a virgin material once and then crushing it.
This is an excellent additive that has the property of not easily forming into a fibrous state and maintains the blended resin composition at a favorable melt viscosity, thereby improving moldability.

When the valve body is formed of a ceramic material, it is preferable to form the valve body using a ceramic material such as a new ceramic shown in Table 1 below, which has appropriate strength and hardness. A valve body made of a ceramic material within these numerical ranges may be used. Also,
To improve the strength, thermal properties, etc. of these materials, about 1
SiO ₂ about 10 _{wt%, Y 2 O 3, Al} 2 O 7,
One or more harmless substances such as AlN, TaN, TiC, Co and other rare earth elements may be added.

[0033]

[Table 1]

The above-mentioned ceramic materials are super heat-resistant, and although the heat insulating property of the resin material is relatively better,
Since the coefficient of linear expansion is about 1/10 smaller than that of the resin material, it is easy to make the gap between the valve elements relatively small, and it is possible to provide a valve device with high clearance accuracy.

As described above, the coefficient of linear expansion is relatively small, the material has thermal insulation properties, and for example, has a thermal shock resistance of at least about 1
When safety is considered, the accuracy of the gap between the valve element and the valve element can be increased by applying the material of about 200 ° C. or more to the valve element in consideration of safety. Even if the present invention is applied to a valve device having a large difference in operating temperature, it is possible to provide a valve device with little backlash, low torque and long life.

Alumina (aluminum oxide, aluminum oxide) which is a representative fine ceramic among ceramic materials
Al ₂ O ₃ ), depending on the crystal form, the use of additives, etc., may have the above-mentioned properties and the properties shown in Table 2 below, such as mechanical strength, heat resistance, dimensional stability, etc. , It can be used as a valve device without excessive specifications and is relatively average in terms of price.
Excellent overall.

[0037]

[Table 2]

If the valve body is made of a ceramic material having a range of the above-described compressive strength, bending strength, hardness, linear expansion coefficient, thermal conductivity, thermal shock resistance, etc., for example, about 17.5 kgf
Even when a water pressure of about / cm ² is applied to the valve body, the valve body has sufficient bending strength and hardness, so that the valve body does not deform, and since it has excellent heat insulating properties and thermal shock resistance, heat Is difficult to escape, can maintain a stable hot water temperature, about 100
A valve device having sufficient thermal shock resistance as a valve body and corrosion resistance even when simultaneously exposed to boiling water at about ° C and low-temperature water can be provided.

The underwater lubricating resin composition of the present invention is obtained by mixing the above-mentioned PEN, glassy carbon, and PTFE powder and melt-molding the mixture, and the mixing and molding method is not particularly limited.

For example, these raw materials are dry-mixed separately or two or more of them at the same time using a mixer such as a Henschel mixer, a ball mill, a tumbler mixer, etc., followed by a hot roll, kneader, Banbury mixer, melt extruder. What is necessary is just to melt-mix and to melt-mold into a predetermined shape. The melt molding temperature is equal to or higher than the temperature at which PEN is melted, and is 330 to 440 ° C., preferably 340 to 340 ° C.
80 ° C. The melt molding method is preferable because injection molding has good mass productivity and can reduce cost.

After molding, it is preferable to carry out post-processing in order to obtain an excellent flatness of the sliding surface. For example, after adjusting the parallelism and flatness of the molded material with a surface grinder or the like, the lapping machine is used. Polish the surface to about 50 μm. In this case, the lap abrasive grains used may be those containing alumina, silicon carbide, or the like as a main component, and those having very fine particle sizes are suitable.

When wrapping a resin softer than a metal with hard abrasive grains, it was expected that the abrasive grains would sink into the resin.
The abrasive grains hardly penetrated into the resin, and small and good flatness and surface roughness could be obtained. Although the reason is not clear, it is speculated that the harder the abrasive grains, the less the heat generation of the material to be wrapped, and consequently the lower the surface hardness or the yield point stress.

In any case, the flatness is also finished simultaneously with the above-mentioned flat polishing. The equipment used for grinding and lapping is easy to process many pieces at once, and the material is a resin that can be processed in a very short time compared to materials such as ceramics and metal, so low cost Can be manufactured.

Although the mechanism of action of the underwater lubricating resin composition of the present invention has not been clearly elucidated, good sliding characteristics are exhibited even when water is present on the sliding surface. Moreover, the abrasion resistance is improved in combination with the characteristics of the polycyano aryl ether, and the material is well resistant to mechanical and thermal shocks.

In the invention relating to the valve device, the properties of the polycyanoaryl ether resin and the vitreous carbon are synergistically exhibited, whereby the lubrication and wear resistance of the valve seat or the valve body are improved, and the mechanical properties are improved. Resistant to thermal and thermal shocks. Further, since the glassy carbon has no anisotropy, the flatness and dimensional accuracy of the sliding surface of the valve seat or the valve element are extremely high.

Therefore, the valve device of the present invention can maintain good water stopping performance and operability over a long period of time, even when used continuously for a long period of time.

Further, by adopting a resin composition obtained by adding PTFE powder to the resin composition for the valve body or valve seat of such a valve device, the slidability is further improved,
The handle torque of the valve device is reduced, and sliding noise (unusual noise) during operation is also eliminated.

[0048]

【Example】

Examples 1 to 8 and Comparative Examples 1 to 8 Raw materials used in Examples 1 to 8 and Comparative Examples 1 to 8 are collectively shown as follows. Note that the abbreviations used in the table are shown in parentheses, and all the mixing ratios are shown by weight%. (1) Polycyano aryl ether resin (PEN) Idemitsu Kosan: ID300 (2) Glassy carbon (GC) Kanebo: Bellpearl C-2000 (3) Regenerated tetrafluoroethylene resin (PTFE) Kitamura: TFE-KT400H (4) Ultra high molecular weight polyethylene (PE) Mitsui Petrochemical: Lubmar, injection molding grade (5) Polyphenylene sulfide resin (PPS) Topren: T-4 (6) Polyetherimide resin (PEI) Made by General Electronics, USA: Ultem 1000 (7) Polyethersulfone resin (PES) Made by ICI: Victrex 4800P (8) Carbon fiber (CF) Made by Toray: Vesfight HTA, fiber diameter 7 0.2 μm, tensile elongation 1.52% (9) Mica (mica) Canada mica Ltd.: Mica S-200, average particle size 60μ
m.

The raw materials were blended in the proportions shown in Table 3 or Table 4, were dry-mixed in advance, and then supplied to a twin-screw extruder (PCM-30, manufactured by Ikegai Iron Works Co., Ltd.) to perform extrusion granulation. The obtained pellets were injection molded into test pieces shown in the following tests A and B using a predetermined mold.

[Friction / Wear Test A] A cylindrical test piece (inner diameter 17 mm, outer diameter 21 mm, length 10 mm) was mounted on a thrust type friction / wear tester, and a slip speed of 4 m / min and a load of 4 were applied.
kgf / cm ² , partner ceramics (Hitachi Chemical Alumina H555, surface roughness 0.01 μmRa), hot water (7
(0 ° C.) The friction coefficient of the test piece under the condition of lubrication was determined 1 hour after the start of the test and 100 hours after the test.
In addition, the wear coefficient (×) was determined from the weight change of the test piece after and 100 hours after the test machine was operated and the specific gravity of the material.
10 ⁻¹⁰ cm ³ / kgfm).

Further, a valve element (outer diameter 27 mm, height 9 mm) that can be mounted on the valve device having the structure shown in FIGS. 1 and 2 was obtained by the same manufacturing method as that of the above-described test piece.

The valve device having the structure shown in FIGS. 1 and 2 is a slide type valve device for mixing hot water and water, that is, a valve element is superimposed on a valve seat having a valve hole, and the valve element is placed on the valve seat with respect to the valve seat. A valve device which slides the valve hole to open and close the valve hole.
The valve seat 5 provided on the bottom plate 2 is formed with two valve holes 6 communicating with each of the inflow ports 4, and a lever holder 8 is rotatably mounted on a valve body 7, and a pin 9 is mounted on the lever holder 8. The lower end of a lever shaft 10 slidably supported through the valve body 7 is connected to a state in which the lower end of the lever shaft 10 is fitted into a square recess 11 on the upper surface of the valve body 7,
The valve body 7 is slidably contacted with the seat surface 13 of the valve seat 5 by the operation of swinging up and down and right and left, so that the two valve holes 6 or both the valve holes 6 and 6 are simultaneously opened and closed.

When the valve body 7 is operated to open the valve hole 6,
Hot water and water supplied to the two inflow ports 4 respectively are supplied to the valve holes 6.
Flow into the mixing chamber 15 from the bottom of the valve element 7 and flow into the mixing chamber 15, and further discharged from the outlet 16 of the mixed water formed on the side wall of the valve box 1 toward the faucet tip. become.

In the valve device described above, a ring-shaped seal member 17 is attached to the lower surface of the lever holder 8 to prevent water from leaking into the shaft insertion hole 18, and a ring-shaped seal member 19 is used to prevent the water from leaking from both members. Prevents water leakage.

In the valve element 7 obtained as described above, the sliding contact surface (seat surface) is ground by a surface grinder to increase the flatness, and the surface roughness is sufficiently reduced by a lapping machine (Ra0. 1-0.
2 μm), and this is made into a valve seat 5 made of alumina (Hitachi Kasei: Alumina H555, surface roughness 0.01 μm Ra).
And mounted on the valve device, and the following functional test B was performed, and the water stoppage, operability, scratching property, and shape deformability due to water absorption were observed, and the results are shown in Table 3 or Table 4. Was.

[Functional test B] (1) Water stoppage and operability The valve body of the valve device (the internal structure is the same as that shown in FIGS. 1 and 2) is replaced with a single lever type mixed water as shown in FIG. It was incorporated into a stopper and examined for water stoppage and operability.

For the water stoppage, set the lever at the lower center (water stop state).
Then, the water pressure was maintained at 17.5 kgf / cm ² by a pump for 30 seconds, and the pressure drop (kgf / cm ² ) due to water leakage after 30 seconds was measured. If the amount of pressure drop at this time was 0.3 kgf / cm ² or less, it was determined to be good.

The operability was measured by measuring the torque of the lever up and down (water stoppage, water discharge, flow rate adjustment) and left and right (adjustment of hot water temperature) using a torque meter (DFG-2K, manufactured by Symbo Kogyo KK). The measured torque value (operating force) at this time is 300 to 10
If it was 00 gf, it was determined to be good. Torque is 300gf
If the torque is smaller than 1000 gf, smooth operation is not obtained if the torque exceeds 1000 gf. Therefore, a more preferable range is 400 to 800 gf.

The water stoppage and operability were confirmed by the following initial tests, durability tests and water absorption tests. Initial test: The initial water stoppage and operability were measured before the durability test. Endurance test: Using the valve body used in the initial test, the lever was connected to an endurance tester (manufactured by NTN Seimitsu Plastics Co., Ltd.), and as shown in FIG. Rd (cold water) → lower left lower Ld (hot water 90 ° C) → upper left upper Lu (water stop) → lower left lower Ld (hot water 90 ° C) → lower center Cd (hot water 45 ° C) → upper center Cu (water stop) → lower center One cycle of Cd (hot water 45 ° C) → lower right end Rd (cold water) → upper right end Ru (water stoppage) (time required: about 25 seconds)
The water stoppage and operability after 200,000 cycles were confirmed. In addition, about the thing with which the water stopping property fell, the further durability test was not performed. Water absorption test: After immersing the valve body in hot water (90 ° C.) for 200 hours, the water stoppage and operability were measured.

(2) Scratchability 1 g of a piece of metal (plane metal) having an average particle size of 3 μm was flowed together with 8 liters of water per minute from the inflow path, and the lever was operated for 10 cycles in the same operation as in the endurance test. Thereafter, the sliding surface of the valve element was examined using a surface roughness meter (Dektak II, manufactured by Nihon Vacuum Co., Ltd.), and the results were evaluated as follows: ○ without any flaw, Δ with flaw less than 1 μm, When the depth of the flaw was 1 μm or more, the evaluation was made in three stages of x.

(3) Deformability due to Water Absorption The surface shape of the sliding surface of the valve body is changed between initial and hot water (90 ° C.).
After the valve body was immersed for 200 hours in the container, it was measured using a surface roughness meter, and the shape change of the sliding contact surface was less than 3 μm.
When the shape change was 3 μm or more and less than 5 μm, the evaluation was made in three grades: Δ, and when the shape change was 5 μm or more, ×.

[0062]

[Table 3]

[0063]

[Table 4]

As is clear from the results of Table 3 or Table 4, Examples 1 to 8 all showed good values in both the water stoppage property and the operability in the initial tests in the functional tests.
The endurance test results after 100,000 cycles also showed that the water stoppage was a pressure drop of 0.3 kgf / cm ² or less, and the operability was good with a torque measured in the range of 300 to 1000 gf. In addition, no influence due to water absorption was observed in the water stopping property, operability and shape deformability.

In Examples 5 to 8 to which PTFE powder was added,
The operability was slightly lighter as compared with the case where no additive was added.

In terms of scratch resistance, 40 parts by weight of glassy carbon and PTFE powder 3
Although slight damage was observed in Example 6 in which 0 parts by weight was added, the performance was not so much as to cause any problem.

On the other hand, in Comparative Example 1 comprising 30 parts by weight of glassy carbon per 100 parts by weight of PEN, the water-stopping pressure drop exceeded 0.3 kgf / cm ² . Further, in Comparative Examples 2 and 3 in which glassy carbon was blended in an amount of 40 parts by weight or 165 parts by weight, water-stopping was poor, and a large number of deep scratches were observed despite the addition of PTFE.

In Comparative Example 4 in which mica was added to PEN, Comparative Example 7 in which carbon fiber was added to PEI, and Comparative Example 8 in which carbon fiber was added to PES, the operability was extremely large and not suitable for use. Comparative Example 5 in which carbon fibers were added to PE was significantly inferior in water stopping properties, and Comparative Example 6 in which carbon fibers and mica were added to PPS was also insufficient in water stopping properties.

The surface roughness of the sliding surface of at least one of the valve element and its mating member is about 3 to 25 μm according to an evaluation method defined by JIS such as Rmax, Ra, Rz.
Or less, preferably about 8 μm or less, more preferably about 3 μm or less. Because, when the surface roughness exceeds the above-mentioned predetermined range, a lot of scratches are given to the sliding surface,
This is because it is considered to cause wear.

It takes a long time to finish the surface of the valve element or its mating member, and it takes a long time. Therefore, it is inefficient and may be affected by the formation of a transfer film of the resin material. It is estimated that if the specifications and conditions are not satisfied, the range may be about 3 to 8 μm or less.

[0071]

As described above, the invention of the valve element and the valve seat comprising the polycyano aryl ether resin and the predetermined amount of the glassy carbon having the predetermined particle size has no anisotropy in the shrinkage ratio at the time of molding and has a small size. It has high precision, and the addition of a fluorine resin has the advantage that the self-lubricating property can be sufficiently obtained.

In the invention in which at least one of the valve seat or the valve body is a molded body of a resin composition comprising a polycyanoaryl ether resin and a predetermined amount of glassy carbon having a predetermined particle diameter, the valve seat or the valve body has a dimension. Molded precisely without errors,
Further, they are excellent in abrasion resistance, and have the advantage that the surface roughness of the sliding contact surface increases during use, and that they are less likely to be damaged by invasion of foreign matter.

Further, such a valve body and a valve seat have excellent mechanical strength such as creep resistance and self-lubricating properties, and sufficiently improve the water stopping performance even when used continuously for a long time. In addition to this, there is an advantage that the handleability for adjusting the amount of water is excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment.

FIG. 2 is an exploded perspective view of parts of the embodiment.

FIG. 3 is a perspective view showing an external appearance of a mixing tap and an operation state of a lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Bottom plate 3 Annular packing 4 Inflow port 5 Valve seat 6 Valve hole 7 Valve 8 Lever holder 9 Pin 10 Lever shaft 11 Depression 12 Lever 13 Seat surface 14 Flow path 15 Mixing chamber 16 Exit 17, 19 Seal member 18 Shaft Insertion hole

Claims (16)

[Claims] 1. A valve body for a valve device in which a valve body is overlapped on a valve seat and the valve body is slid with respect to the valve seat, wherein the valve body is based on 100 parts by weight of a polycyano aryl ether resin. A valve body which is a molded body of a resin composition containing 40 to 165 parts by weight of glassy carbon having an average particle diameter of 3 to 30 µm. 2. A valve body for a valve device in which a valve body is overlapped on a valve seat and the valve body is slid with respect to the valve seat, wherein the valve body is based on 100 parts by weight of a polycyano aryl ether resin. 40 to 165 parts by weight of glassy carbon having an average particle size of 3 to 30 μm, and 1 to 30 parts of a fluororesin powder.
A valve body characterized in that it is a molded body of a resin composition blended in parts by weight. 3. The valve body according to claim 2, wherein the fluororesin powder is ethylene tetrafluoride resin powder. 4. The valve element according to claim 3, wherein the tetrafluoroethylene resin powder is a recycled tetrafluoroethylene resin powder. 5. The valve body according to claim 1, wherein the glassy carbon is a glassy carbon obtained by carbonizing and firing a phenol resin or a furan resin. 6. The glassy carbon according to claim 6, wherein the glassy carbon is 800 to 20.
The valve body according to claim 1, which is a glassy carbon obtained by firing at 00 ° C. 7. The sliding surface of the valve element has a surface roughness of 25 μm.
The valve body according to claim 1, wherein m is equal to or less than m. 8. The sliding surface of the valve body has a surface roughness of JIS.
3. The valve body according to claim 1, wherein the value is 25 μm or less according to Ra of the evaluation method defined in (3). 9. A valve seat for a valve device in which a valve body is superimposed on a valve seat and the valve body is slid with respect to the valve seat, wherein the valve seat is 100 parts by weight of a polycyano aryl ether resin. A valve seat characterized in that it is a molded product of a resin composition containing 40 to 165 parts by weight of glassy carbon having an average particle size of 3 to 30 µm. 10. A valve seat for a valve device in which a valve body is overlapped on a valve seat and the valve body is slid with respect to the valve seat, wherein the valve seat is 100 parts by weight of a polycyano aryl ether resin. 40 to 165 parts by weight of glassy carbon having an average particle size of 3 to 30 μm, and 1 to 30 parts of a fluororesin powder.
A valve seat characterized in that it is a molded product of a resin composition blended in parts by weight. 11. The valve seat according to claim 10, wherein the fluororesin powder is an ethylene tetrafluoride resin powder. 12. The valve seat according to claim 11, wherein the tetrafluoroethylene resin powder is a regenerated tetrafluoroethylene resin powder. 13. The valve seat according to claim 9, wherein the glassy carbon is glassy carbon obtained by carbonizing and firing a phenol resin or a furan resin. 14. The glassy carbon according to claim 1, wherein the glassy carbon is 800-2.
The valve seat according to claim 9, 10 or 13, which is glassy carbon obtained by firing at 000 ° C. 15. The sliding surface of the valve seat has a surface roughness of 25.
The valve seat according to claim 9, wherein the valve seat is not more than μm. 16. The sliding surface of the valve seat has a surface roughness of JI.
The valve seat according to claim 9, wherein the value is 25 μm or less according to Ra of the evaluation method defined in S. 11.