JP2000028029A - Ball tap device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the dimensional accuracy and the corrosion resistance of a ball tap component by providing a brass member in which the apparent content and the means grain size of Zn and Sn are respectively specified on a ball tap in a device which is provided with a water tank and a ball tap, and keeps the water level in the water tank to be contact. SOLUTION: A link rod 2 to be turned above and below an outer surface of a valve casing through a connection pipe 0 is supported by a water supply pipe for a water tank, and a ball 17 forming a float floating on a water surface in the water tank is fitted to a turning end part. A valve element 4 fitted to a valve stem 3 in the valve casing 1 is attached/detached to/from a valve seat 6 formed around a discharge port 5 by the movement of the ball 17 to be vertically moved according to the fluctuation of the water level, and the discharge port 5 is opened/closed thereby. Members 1, 2, 6, 17 to constitute this ball tap are formed of brass material in which the apparent content of Zn is 37-46 wt.%, the apparent content of Sn is 0.5-7%, and the means grain size is <=20 μm. The brass material is forged at the temperature of <=650 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a ball tap device,
Preferably, the present invention relates to a ball tap device provided with a hot water storage tank.

[0002]

2. Description of the Related Art Conventionally, a ball tap device shown in FIG. 1 has been known. A water supply pipe (not shown) for supplying water to the water tank is supported on an outer surface of the valve box 1 via a connection pipe 0 on a link rod 2 which rotates vertically, and a rotating end of the link rod 2 is provided inside the water tank. A ball 17 serving as a float floating on the liquid surface of the water attached to the water tank is attached, and the movement of the ball moving up and down due to the fluctuation of the water level in the water tank is expanded via the link rod 2 and transmitted to the valve box 1 side. By the movement of the expanded ball, the valve body 4 attached to the valve rod 3 in the valve box 1 is moved upward with respect to the valve seat 6 formed in an annular shape so as to surround the discharge port 5 provided in the valve box 1. When the water level in the water tank falls and the ball moves downward, the valve body 4 moves away from the valve seat 6 with the valve rod 3 descending, and the valve opening operation is performed so as to open the discharge port 5. When the water level rises and the ball moves upward, the valve body 4 rises and the valve element 4 moves the valve seat 6. Close the discharge port 5 in pressure contact are configured such closing operation is performed.

[0003] In order to reduce the burden of water pressure on the ball, a valve stem 1 is attached to a valve rod 3 so as to face a valve element 4.
A piston is mounted as a balance valve 7 on the upper surface side of. Reference numeral 8 denotes a cover body that covers the opening B formed on the upper surface of the valve box 1, and an airtight chamber S is provided immediately below the cover body 8.
The upper surface of the balance valve 7 is located via the.

When the pressure of the water flowing into the valve box 1 from the water supply pipe causes the pressure of the valve element 4 pressed against the valve seat 6 to be lowered, the balance valve 7 causes the valve element 4 to move downward.
The balance valve 7 presses the air in the airtight chamber S toward the cover body 8 so that the force that pushes the valve body 4 toward the valve closing side with the same force as the force that is exerted when the valve body 4 is pushed down is exerted by the water pressure.
Works so that the operation of is not affected by water pressure.

Reference numeral 9 denotes a valve body guide provided below the valve body 4, and reference numeral 10 denotes a cylindrical strainer for protecting the valve seat 6 from clogging of dust contained in water passing through the water supply pipe. The strainer 10 is formed with a net that captures dust in the water from the water supply pipe to the valve box 1 via the connection pipe 0.

Reference numeral 11 denotes a connector for connecting a first lever 12 connected to the link rod 2 and a second lever 14 which rotates vertically about a pivot 13 as a fulcrum.
Is configured to rotate up and down around the pivot 13 of the link mechanism including the first lever 12, the connector 11, and the second lever 14. Reference numeral 15 denotes a water level adjusting mechanism provided on the connector 11, reference numeral 16 denotes a fulcrum of the first lever 12, and reference numeral A denotes an axis of the valve rod 13.

[0007]

Among the members described above, the connecting pipe 0, the valve box 1, the valve seat 6, the balance valve 7, the cover body 8, the connector 11, the first lever 12, and the second lever 1
About No. 4, it was a bronze casting and could not respond to the demand for complicated shapes and dimensional accuracy.

A link rod 2, a valve rod 3, a water level adjusting mechanism 15,
The ball 17 was a portion that was susceptible to erosion corrosion, but could not be handled by conventional materials.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the dimensional accuracy of a ball tap component in a ball tap device and to satisfy corrosion resistance.

Another object of the present invention is to provide a ball tap device as a hot water storage tank, which satisfies the high temperature corrosion resistance of the ball tap constituent members.

Incidentally, in the present invention, dezincification corrosion resistance, stress corrosion cracking resistance (hereinafter referred to as SCC resistance), and erosion corrosion resistance of brass are treated as indices representing corrosion resistance.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a ball tap device having a water tank and a ball tap, wherein the ball tap has an apparent Zn content of 37. ~ 46wt%,
Sn content 0.5-7%, average grain size 20 μm
Hereinafter, by using a brass member having a crystal structure of preferably 15 μm or less, the high-temperature corrosion resistance of the brass member in the hot water storage tank is improved.

When a brass member is formed by cutting from a brass rod for cutting, the average crystal grain size can be further reduced without heating during forging, so that it is preferably 15 μm or less. Also, when forging a brass member,
According to the present invention, forgeability is improved and dimensional accuracy is improved.

Specifically, according to the above configuration, 480 to 6
At 50 ° C., the β phase ratio is 30 to 80%, and the average crystal grain size is 2
0 μm or less, preferably having a crystal structure of 15 μm or less,
No damage by applying 160% strain at a strain rate of 0.0008 / sec, no damage by applying 50% strain at a strain rate of 0.0083 / sec, 0.083
The present applicant has confirmed that a ductility that satisfies at least one of 30% strain at a strain rate of / sec and that there is no breakage can be realized.

Here, the term "apparent Zn content" means that A is Cu content [wt%], B is Zn content [wt%], and t is a third element (for example, Sn). Z
When n equivalents and Q are the content of the third element [wt%], “{(B + t · Q) / (A + B + t · Q)} × 10
0 ”is used.

The above brass member is preferably forged at a temperature of 650 ° C. or lower. As a result, dezincification and adhesion of an oxide film which occur during high-temperature forging at 700 ° C. or higher can be suppressed, and the polishing process after forging can be reduced.

More preferably, the content of Sn is 1.5 to
By setting it to 4.0%, at 450 to 550 ° C., α
Phase area ratio is 44 to 85%, β phase area ratio is 1 to 5
5%, γ phase area ratio is 1 to 25%, preferably α phase ratio is 44 to 65%, β phase ratio is 10 to 55%, γ phase ratio is 1 to 25%, average crystal grain size Having a crystal structure of 20 μm or less, preferably 15 μm or less;
No damage at 50% strain at a strain rate of / sec, no damage at 25% strain at a strain rate of 0.0083 / sec, 30% at a strain rate of 0.083 / sec. , And at least one of the following: no breakage.

Then, using such a crystal structure,
Even if forging is performed at a temperature of 550 ° C. or lower, high ductility can be obtained, and dezincification and adhesion of an oxide film can be further reduced.

According to another aspect of the present invention, cutting properties are improved by including a β phase in the crystal structure of a brass member, and dezincification corrosion resistance is improved by including Sn in the β phase. are doing. In addition, since it is made of brass, the strength is superior to that of bronze.

Here, what is conventionally known as a dezincification-resistant brass rod excellent in dezincification-corrosion resistance is inferior in machinability because it is a single phase of α-phase excellent in dezincification-corrosion resistance. However, the present invention is characterized in that the β phase, which has not been precipitated as much as possible because of its poor zinc-free corrosion resistance, is effectively used.

Specifically, in addition to the high-temperature corrosion resistance of the hot water storage tank, (1) a characteristic in which a cutting resistance index based on a free-cutting brass bar according to Japanese Industrial Standard JISC-3604 is 80 or more; Copper Association Technical Standard JBMA T-303
When the maximum zinc removal depth direction is parallel to the processing direction when the zinc removal corrosion test according to
When the direction of the maximum dezincification penetration depth is perpendicular to the processing direction, the characteristics satisfying the corrosion resistance of the maximum dezincification depth of 70 μm or less can be satisfied.

Incidentally, the Sn content in the β phase and the area ratio of the β phase can be controlled by controlling the cooling rate.

Further, the crystal structure contains α and γ phases, and the difference in crystal hardness at the grain boundaries of these phases improves the machinability, and the inclusion of Sn in the γ phase allows dezincification corrosion resistance. The brass member having improved properties is characterized by the effective use of the γ phase, which has been conventionally prevented from being precipitated because of its brittleness. This also satisfies the high-temperature corrosion resistance in the hot water storage tank and the above-mentioned characteristics (1) and (2).

In still another aspect of the present invention, the brass member has an α + β-phase two-phase and β-phase area ratio of 15% or more,
The average crystal grain size of the α and β phases is 20 μm or less, preferably 1 μm or less.
It has a crystal structure of 5 μm or less, and has excellent cutting properties and SCC resistance.

Here, the machinability is ensured by the β phase, and the SCC resistance has not been ascertained in detail. However, the SCC resistance is ensured based on the action of α + β due to the hetero-phase interface and the refinement of the average crystal grain size. Seems to be.

More specifically, in addition to the characteristic (1),
(3) When the cylindrical sample is exposed to an ammonia atmosphere on a 14% ammonia aqueous solution for 24 hours while applying a load, the maximum stress that does not crack the sample can be 180 N / mm 2 or more.

Further, when the Sn concentration in the β phase is 1.5 wt%
With the above, high-temperature corrosion resistance in the hot water storage tank and dezincification corrosion resistance described in (2) above can be obtained. And erosion corrosion resistance can also be satisfied.

The brass member has two phases, α + γ phase, γ
The area ratio of the phase is 3 to 30%, and the average crystal grain size of the α phase is 20.
μm or less, preferably 15 μm or less, the average crystal grain size (minor diameter) of the γ phase is 8 μm or less, and the α and γ phase has a crystal structure in which the γ phase is scattered at the α phase grain boundary. The SCC resistance of (3) above is ensured while the cutting properties of (1) above are ensured by the grain boundaries.

Further, by setting the Sn concentration in the γ phase to 8 wt% or more, high-temperature corrosion resistance in the hot water tank and dezincification corrosion resistance described in the above (2) can be obtained. And erosion corrosion resistance can also be satisfied.

The brass member has three phases of α + β + γ phases, the α phase area ratio is 44 to 85%, the β phase area ratio is 1 to 55%, the γ phase area ratio is 1 to 25%, Preferably, the area ratio of the α phase is 44 to 65%, and the area ratio of the β phase is 10%.
-55%, the area ratio of the γ phase is 1 to 25%, the average crystal grain size of the α, β, and γ phases is 20 μm or less, preferably 15 μm or less, and the α, β, and γ phases are dispersed and exist. By having a crystal structure, the SCC resistance of the above (3) is secured while the machinability of the above (1) is secured by the β phase and α, γ phase grain boundaries.

Further, by setting the Sn concentration in the γ phase to 8 wt% or more, the high-temperature corrosion resistance in the hot water storage tank and the dezincification corrosion resistance described in the above (2) can be obtained. And erosion corrosion resistance can also be satisfied.

[0032] The ball tap device according to the present invention also includes:
The brass member was changed to an apparent Zn content of 37 to 46 wt.
%, Sn content of 1.5 to 4%, and a crystal structure of two or more phases, resulting in excellent characteristics of high-temperature corrosion resistance, dezincification corrosion resistance, cutability, and erosion corrosion resistance in a hot water storage tank. Can be provided. Here, the reason why the apparent Zn content is set to 37 to 46 wt% is as follows.
Within this range, the above α + β phase, α + γ phase, α +
This is because the β + γ phase can be arbitrarily selected. In particular,
The crystal transformation temperature range in this range is β single phase in the high temperature range,
This is because the above-mentioned three types of crystal structures can be selected by controlling the cooling rate from the high-temperature region by utilizing the α + β phase in the lower temperature range and the α + γ phase in the lower temperature range.

As the brass member described above, various constituent members of a ball tap are suitable.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, the structure shown in FIG. 1 is diverted as it is.
Valve box 1, link rod 2, valve rod 3, valve seat 6, balance valve 7,
The cover body 8, the connector 11, the first lever 12, the second lever 14, the water level adjusting mechanism 15, and the ball 17 have any one of the following crystal structures (1) to (3) and are formed by forging. It is a point.

(1) Two phases α + β, the area ratio of the β phase is 15% or more, the average crystal grain size of the α and β phases is 20 μm or less, preferably 15 μm or less, and the Sn concentration in the β phase is 1.
5 wt% or more.

(2) Two phases of α + γ phase, the area ratio of the γ phase is 3 to 30%, the average crystal grain size of the α phase is 20 μm or less, preferably 15 μm or less, and the average crystal grain size of the γ phase (minor diameter) ) Is 8 μm or less, the γ phase is scattered at the grain boundaries of the α phase, and the Sn concentration in the γ phase is 8 wt% or more.

(3) In the three phases of α + β + γ phase, the area ratio of α phase is 44 to 85%, the area ratio of β phase is 1 to 55%, γ
The area ratio of the phase is 1 to 25%, preferably the area ratio of the α phase is 44 to 65%, the area ratio of the β phase is 10 to 55%, the area ratio of the γ phase is 1 to 25%, α, β, and γ. The average crystal grain size of the phase is 20 μm or less, preferably 15 μm or less;
β and γ phases are dispersed and the Sn concentration in the γ phase is 8 wt.
% Or more, and the γ phase surrounds the β phase.

The crystal structure as described above has an apparent Zn
The content is 37-46 wt%, and the content of Sn is 0.5-7.
It can be adjusted by controlling the cooling rate after forging under the composition of wt%, preferably 1.5 to 4 wt%. Also,
The Sn concentration in the β and γ phases can also be adjusted by controlling the cooling rate.

Here, the term "apparent Zn content" means that A is Cu content [wt%], B is Zn content [wt%], and t is a third element (for example, Sn). Z
When n equivalents and Q are the content of the third element [wt%], “{(B + t · Q) / (A + B + t · Q)} × 10
0 ”is used.

According to the crystal structures (1) to (3), the following characteristics (A) to (C) can be obtained.

(A) Japanese Industrial Standard JIS C-3604
A cutting resistance index of 80 or more based on a free-cutting brass bar according to

(B) Japan Copper and Brass Association Technical Standard JBMA T
When performing a dezincification corrosion test in accordance with -303, if the maximum dezincification depth direction is parallel to the processing direction, the maximum dezincification depth is 100 μm or less, or the maximum dezincification depth direction is perpendicular to the processing direction. In this case, the properties satisfy the corrosion resistance with a maximum dezincing depth of 70 μm or less. In the case of a forged product, when a dezincification corrosion test was conducted in accordance with the Japan Copper and Brass Association Technical Standard JBMA T-303, this corresponds to the case where the maximum dezincification penetration depth direction is perpendicular to the processing direction. It shall satisfy the characteristics satisfying the corrosion resistance of 70 μm or less.

(C) When the cylindrical sample was exposed to an ammonia atmosphere on a 14% aqueous ammonia solution for 24 hours while applying a load, the maximum stress at which the sample did not crack was 180 N / m.
Characteristics of m2 or more.

The cutting resistance index of (A) will be described in detail with reference to FIG. 2. In the cutting test, a round bar-shaped sample 51 was used on a lathe.
100 m / min and 400 m / min
The main component force Fv was measured while cutting at two different speeds. The cutting resistance index is a free-cutting brass bar (Japanese Industrial Standard JIS C-36) which is said to have the best machinability for the main component force.
04) is the percentage of the main component. (The cutting resistance index for each cutting speed was averaged.)

As shown in FIG. 3, in the SCC resistance test (B), the cylindrical sample 53 was exposed to an NH3 vapor atmosphere for 24 hours in a state where a load was applied vertically to the cylindrical sample 53 in the glass digitizer 52. Later, the occurrence of cracks was investigated.

According to the crystal structures (1) to (3),
Also shows good characteristics in erosion corrosion resistance. FIG.
The method of the erosion corrosion resistance test is shown. In the erosion corrosion resistance test, as shown in FIG. 4, a cylindrical sample 55 having an orifice 54 therein was used, and after flowing water through the orifice 54 at a flow rate of 40 m / sec for a predetermined time, 4.9 × 10 5 Pa ( Under a water pressure of 5 kg / cm <2>), the tightening torque to the resin stopper 56 required for sealing the orifice 54 was measured.

The results of the test shown in FIG. 4 are as shown in FIG. 5, and the brass material having the crystal structures (1) to (3) obtained better characteristics than the conventional example. In the conventional example, the Sn content was 0.5%.
Less than wt% was used.

According to the crystal structures (1) to (3), during forging, (4) at 480 to 650 ° C., the β phase ratio is 30 to 80%, and the average crystal grain size is 20 μm or less. Has a crystal structure of 15 μm or less, and 0.0008
No damage due to 160% strain at a strain rate of 3 / sec, no damage at 50% strain at a strain rate of 0.0083 / sec, 30 at a strain rate of 0.083 / sec. % Ductility satisfying at least one of the following:

As a result, sufficient elongation can be ensured even when forging is performed at a temperature of 650 ° C. or less, dezincification and adhesion of an oxide film generated during high-temperature forging at 700 ° C. or more are suppressed, and the polishing process after forging is reduced. it can.

Further, the content of Sn is set to 1.5 to 4.0%.
By limiting to (5) 450-550 ° C.,
The area ratio of the α phase is 44 to 85%, and the area ratio of the β phase is 1 to
55%, γ phase area ratio is 1 to 25%, preferably α phase ratio is 44 to 65%, β phase ratio is 10 to 55%, γ
It has a crystal structure having a phase ratio of 1 to 25% and an average crystal grain size of 20 μm or less, preferably 15 μm or less, and 0.0008.
No damage at 50% strain at 3 / sec strain rate, no damage at 25% strain at 0.0083 / sec strain rate, 30 at 0.083 / sec strain rate. % Ductility satisfying at least one of the following:

As a result, high ductility can be obtained even when forging is performed at a temperature of 550 ° C. or lower, so that dezincification and adhesion of an oxide film can be further reduced.

FIG. 6 shows the shape and dimensions (distance between gauges of 12 mm and outer diameter of φ2.5 mm) of the test pieces for these characteristics.
The test conditions are shown in FIG. The tensile tester used was a mechanical type, the heating was an electric heater, and the atmosphere was air.

FIG. 8 shows the relationship between temperature and elongation.
It can be seen that the crystal structure (5) shows a higher elongation at 50 ° C. than the conventional example. Here, in the conventional example, 4
At 50 ° C., those having a crystal structure of α + β, β <25%, average particle size> 20 μm or less, preferably 15 μm or less were used.

According to the above-mentioned crystal structures (1) to (3), the problem of high-temperature corrosion resistance peculiar to storing hot water in a ball tap device can be solved. This is shown in FIG.

In FIG. 9, Example 1 has a crystal structure (3), Example 2 has a crystal structure (2), Comparative Example 1 is a conventional brass for dezincification-resistant forging, and Comparative Example 2 is a free brass. It is a shaved brass bar, and Example 1 and Comparative Example 1 are samples after forging. As the value of the corrosion depth, the result of immersion in city water at 85 ° C. for 3 months was used.

As can be seen from FIG. 9, Comparative Example 2 is inferior in high-temperature corrosion resistance because it does not contain Sn. Comparative Example 1
Is inferior in high-temperature corrosion resistance despite containing Sn.

This is because the crystal structure of Comparative Example 1 has an average crystal grain size of 30 μm or more and the area ratio of each of the β and γ phases is less than 3%. It does not belong to this.

[Brief description of the drawings]

FIG. 1 shows a ball tap device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a cutting test of the embodiment.

FIG. 3 shows stress corrosion cracking resistance (SCC resistance) of the embodiment.
Illustration of test

FIG. 4 is an explanatory diagram of an erosion corrosion resistance test of the embodiment.

FIG. 5 is a result of an erosion corrosion resistance test of the same embodiment.

FIG. 6 shows the shape of a high-temperature tensile test piece of the embodiment.

FIG. 7 is a high-temperature tensile test condition of the embodiment.

FIG. 8 shows a result of a high temperature tensile test of the embodiment and a conventional example (relation between temperature and elongation).

FIG. 9 shows the results of a high-temperature corrosion resistance test of the embodiment and a conventional example.

[Explanation of symbols]

0 ... connecting pipe, 1 ... valve box, 2 ... link rod, 3 ... valve rod, 4 ...
Valve body, 5 ... discharge port, 6 ... valve seat, 6 ... valve seat, 7 ... balance valve, 8 ... cover body, 9 ... valve body guide, 10 ... strainer, 11 ... connector, 12 ... first lever, 13 pivot shaft, 14 second lever, 15 water level adjustment mechanism, 16 fulcrum of lever 12, 17 ball, S airtight chamber, A valve stem 1
3 axis, B ... opening

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // C22F 1/00 630 C22F 1/00 630J 640 640A 694 694B

Claims (15)

[Claims] 1. A ball tap device comprising a water tank and a ball tap, wherein a water level in the water tank is maintained at a predetermined water level, wherein the ball tap has an apparent Zn content of 37-4.
A ball tapping device comprising a brass member having 6 wt%, a Sn content of 0.5 to 7%, and an average crystal grain size of 20 μm or less. 2. A ball tap device comprising a water tank and a ball tap, wherein the water tap in the water tank is maintained at a predetermined water level, wherein the ball tap comprises a brass member formed by forging. 3. The ball tap device according to claim 2, wherein the brass member has an apparent Zn content of 37 to 46 wt% and an average crystal grain size of 20 μm or less. 4. The ball tap device according to claim 3, wherein the brass member is forged at a temperature of 650 ° C. or less. 5. The brass member having a Sn content of 1.
The ball tap device according to claim 1, wherein the content is 5 to 4.0%. 6. The ball tap device according to claim 5, wherein the brass member is forged at a temperature of 550 ° C. or less. 7. A ball tap device comprising a water tank and a ball tap, wherein a water level in the water tank is maintained at a predetermined water level, wherein the ball tap includes a β phase in a crystal structure to improve machinability. A ball tap device comprising a brass member having improved dezincification corrosion resistance by containing Sn therein. 8. A ball tap device comprising a water tank and a ball tap, wherein a water level in the water tank is maintained at a predetermined water level, wherein the ball tap contains α and γ phases in a crystal structure,
A ball tap device comprising a brass member that has improved machinability due to the difference in crystal hardness at the grain boundaries of these phases and that has improved anti-zinc corrosion resistance by containing Sn in the γ phase. 9. A ball tap device comprising a water tank and a ball tap, wherein the water tap in the water tank is maintained at a predetermined water level, wherein the ball tap has two phases of α + β phases, and the area ratio of the β phase is 15% or more, α, β A ball tap device comprising a brass member having a crystal structure having an average crystal grain size of a phase of 20 μm or less and having excellent machinability and SCC resistance. 10. The Sn concentration in the β phase is 1.5 wt%.
The ball tap device according to claim 9, wherein the brass member is excellent in machinability, dezincification corrosion resistance, and SCC resistance. 11. A ball tap device comprising a water tank and a ball tap, wherein a water level in the water tank is maintained at a predetermined water level, wherein the ball tap has two phases of α + γ phase, an area ratio of γ phase is 3 to 30%, and α phase is Average grain size of 20 μm or less,
the average crystal grain size (minor diameter) of the γ phase is 8 μm or less;
A ball tap device comprising a brass member having a crystal structure in which a γ phase is scattered in a phase grain boundary and having excellent machinability and SCC resistance. 12. The ball tap apparatus according to claim 11, wherein the Sn concentration in the γ phase is 8 wt% or more, and the brass member is excellent in machinability, dezincification corrosion resistance and SCC resistance. 13. A ball tap device comprising a water tank and a ball tap, wherein the water level in the water tank is maintained at a predetermined water level. The ball tap has three phases of α + β + γ phases, wherein the area ratio of the α phase is 44 to 85%, β Phase area ratio is 1 to 55
%, The area ratio of the γ phase is 1 to 25%, preferably the area ratio of the α phase is 44 to 65%, and the area ratio of the β phase is 10 to 55.
%, The area ratio of the γ phase is 1 to 25%, the average crystal grain size of the α, β, and γ phases is 20 μm or less, and the crystal structure in which the α, β, and γ phases are dispersed is present. Ball tap device comprising a brass member excellent in heat resistance and SCC resistance. 14. The Sn concentration in the γ-phase is 8 wt% or more, the γ-phase surrounds the β-phase, and the brass member is made to have machinability, dezincification corrosion resistance and 14. The ball tap device according to claim 13, wherein the ball tap device has excellent SCC resistance. 15. A ball tap device comprising a water tank and a ball tap, wherein a water level in the water tank is maintained at a predetermined water level, wherein the ball tap has an apparent Zn content of 37-4.
A ball tap device comprising a brass member having 6 wt% and a Sn content of 1.5 to 4% and having a crystal structure of two or more phases and having excellent dezincification corrosion resistance and excellent machinability.