CN114185368A - High-precision flow proportional control valve - Google Patents
High-precision flow proportional control valve Download PDFInfo
- Publication number
- CN114185368A CN114185368A CN202111458410.7A CN202111458410A CN114185368A CN 114185368 A CN114185368 A CN 114185368A CN 202111458410 A CN202111458410 A CN 202111458410A CN 114185368 A CN114185368 A CN 114185368A
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 49
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 8
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
Abstract
The invention discloses a high-precision flow proportional control valve which is suitable for occasions with high-precision control requirements on flow proportion when two storage tanks or storage tanks discharge liquid or exhaust gas simultaneously. The medium is regulated and limited in flow by the throttling rings at the inlets at the two ends of the valve shell, when the flow proportion changes due to the influence of external pressure fluctuation on the medium flowing into the two ends of the valve shell, the automatic feedback adjusting mechanism mainly comprising the piston assembly, the adjusting lever, the two-way adjusting valve core and the spring can restore and adjust the change of the flow state, so that the purpose of accurately controlling the flow size and proportion when the medium is discharged outwards is achieved, and the automatic feedback adjusting mechanism has the characteristics of adjustable sensitivity and strong applicability and maintainability.
Description
Technical Field
The invention relates to a high-precision flow proportional control valve which is mainly used for discharging and mixing control of gas or liquid according to a certain flow proportion in the fields of aerospace, chemical engineering and the like.
Background
In the field of aerospace, the control method has high requirements on the mass center and the working state of the aircraft in the working process. When the aircraft has a plurality of tanks or storage tanks, the operating state of the aircraft is easily affected by the change of the center of mass caused by the consumption of the working medium or the fluctuation of the mixing ratio of the working medium. The influence of the fluctuation of the flow proportion of the working medium caused by the change of the working state or the fluctuation of the external pressure is eliminated, the controllability of the working state of the aircraft can be further improved, and the potential safety hazard possibly caused by the change of the mass center and the working state is eliminated.
Disclosure of Invention
The invention aims to design a high-precision flow proportional control valve with an automatic feedback adjusting structure, which can perform high-precision flow proportional control on a working medium entering the valve, and further, the high-precision flow proportional control valve is applied to an aircraft to improve the working state controllability of the aircraft.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-precision flow proportional control valve comprises,
a valve housing having a first inlet, a second inlet and an outlet, a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber disposed therein, wherein,
one end of the first chamber is communicated with the first inlet;
one end of the second chamber is communicated with the second inlet;
the third chamber is respectively communicated with the fourth chamber, the fifth chamber and the outlet;
the fourth chamber is connected with the first chamber, and the fifth chamber is communicated with the second chamber;
the bidirectional regulating valve core is positioned in the third cavity, the left end and the right end of the bidirectional regulating valve core respectively extend into the fourth cavity and the fifth cavity, two valve core conical surfaces are arranged on the surface of the bidirectional regulating valve core, and the two valve core conical surfaces respectively form two throttling channels with the inner wall of the fourth cavity and the inner wall of the fifth cavity;
the adjusting screw comprises a first adjusting screw and a second adjusting screw, the first adjusting screw is in threaded connection with one end of the fourth chamber, the first adjusting screw is connected with one end of the bidirectional adjusting valve core, the second adjusting screw is in threaded connection with one end of the fifth chamber, and the second adjusting screw is connected with the other end of the bidirectional adjusting valve core;
the spring comprises a first spring and a second spring, the first spring is positioned in the fourth cavity and is sleeved on the bidirectional regulating valve core, the second spring is positioned in the fifth cavity and is sleeved on the bidirectional regulating valve core, the first spring is positioned between the first regulating screw and the conical surface of the valve core, and the second spring is positioned between the second regulating screw and the conical surface of the valve core at the other position;
the piston assembly spans the first chamber, the second chamber and the third chamber and comprises a first piston and a second piston, the first piston is connected with the inner wall of the first chamber in a sliding mode, and the second piston is connected with the inner wall of the second chamber in a sliding mode;
and two ends of the adjusting lever are respectively and rotatably connected with the bidirectional adjusting valve core and the piston assembly.
As an option, the high-precision flow proportional control valve further comprises two throttling rings, and the two throttling rings are detachably connected in the first cavity and the second cavity respectively.
Alternatively, the high-precision flow proportional control valve further comprises a valve core guide sleeve, the valve core guide sleeve is connected to the end face of the adjusting screw, the two valve core guide sleeves are in sliding fit with the inner walls of the fourth cavity and the fifth cavity respectively, the left end and the right end of the bidirectional adjusting valve core are connected to the two valve core guide sleeves respectively, and one end of the spring is tightly attached to the valve core guide sleeve.
As an option, the high-precision flow proportional control valve further comprises an O-shaped sealing ring, and the O-shaped sealing ring is sleeved on the outer surface of the adjusting screw and forms sealing with the inner wall of the fourth chamber and the inner wall of the fifth chamber.
Alternatively, two spring positioning surfaces are arranged on the surface of the bidirectional adjusting valve core, the two spring positioning surfaces are respectively positioned between the first spring and the conical surface of the valve core and between the second spring and the conical surface of the other valve core, and the two spring positioning surfaces are tightly attached to one end of the spring.
Alternatively, the high-precision flow proportional control valve further comprises a rotary connecting pin, the rotary connecting pin is respectively and rotatably connected to the bidirectional adjusting valve core and the piston assembly, a pin hole is formed in the rotary connecting pin, and two ends of the adjusting lever are connected with the pin hole.
Alternatively, the high-precision flow proportional control valve further comprises an adjusting lever rotating fulcrum, the adjusting lever rotating fulcrum is located in the third chamber and hinged to the adjusting lever, and the hinged point is located between the adjusting lever and the rotating connection point of the bidirectional adjusting valve core and the piston assembly.
Alternatively, the first and second chambers are symmetrical about a third chamber, and the fourth and fifth chambers are symmetrical about the third chamber.
Alternatively, the cross-sectional area of the first piston in contact with the medium is different from the cross-sectional area of the second piston in contact with the medium.
An aircraft having a plurality of tanks or reservoirs, any two of which are connected by a high precision flow proportional control valve as claimed in any preceding claim, wherein the tanks or reservoirs are gas or liquid.
Compared with the prior art, the valve core provided by the invention has an automatic feedback regulation structure, can be used for carrying out high-precision flow proportion regulation on the working medium entering the valve, and has the following advantages:
(1) two valve core conical surfaces on the bidirectional adjusting valve core respectively form two throttling channels with the inner wall of the fourth cavity and the inner wall of the fifth cavity, and the area size (annular area size) of the two throttling channels is changed through the left and right movement of the bidirectional adjusting valve core, so that the flow is changed;
(2) the piston assembly, the adjusting lever and the bidirectional adjusting valve core form an automatic feedback adjusting mechanism, and the automatic feedback adjusting mechanism automatically adjusts working media entering the first inlet and the second inlet by sensing pressure change;
(3) the use of the throttle ring and the adjusting screw can adjust the flow and the flow proportion control sensitivity according to the actual working condition;
(4) the whole high-precision flow proportional control valve is of a pure mechanical structure, has low failure rate and high reliability, is convenient to replace and maintain each component, and can recover normal work only by simply replacing the corresponding abrasion component when abrasion and other conditions occur;
(5) the rotating force arm can be adjusted by adjusting the change of the rotating fulcrum of the lever, so that the sensitivity of the high-precision flow proportional control valve is adjusted;
(6) the connecting device is suitable for connecting different storage tanks or storage tanks in the aircraft, and ensures that the mass center change influence of the aircraft is controllable.
Drawings
FIG. 1 is a schematic diagram of a high-precision flow proportional control valve according to the present invention;
FIG. 2 is a schematic view of the high precision flow proportional control valve in a state in which it performs flow regulation when it senses a pressure change;
in the drawings, 1-valve housing; 2-bidirectional regulating valve core; 3-a spring; 4-valve core guide sleeve; 5-O-shaped sealing rings; 6-adjusting the screw; 7-a throttle ring; 8-a piston assembly; 9-rotating the connecting pin; 10-an adjustment lever; 11-adjusting the lever rotation fulcrum; 12-valve core conical surface; 13-throttling the passage.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
As an embodiment of the present invention, as shown in fig. 1 to 2, the high-precision flow proportional control valve mainly comprises a valve housing 1, a bidirectional regulating valve core 2, a spring 3, a valve core guide sleeve 4, an O-ring 5, a regulating screw 6, a throttle ring 7, a piston assembly 8, a rotary connecting pin 9, a regulating lever 10, and the like. Wherein the piston assembly 8 and the spring 3 are automatic adjusting feedback devices; the bidirectional regulating valve core 2 is an automatic regulating executing device, and valve core conical surfaces 12 at two ends of the bidirectional regulating valve core 2 and corresponding channels form throttling channels 13 with adjustable areas, which correspond to A1 flow sections (annular) and A2 flow sections (annular) in the figures 1 and 2.
The valve shell 1 is provided with a first inlet, a second inlet and an outlet, a first cavity, a second cavity, a third cavity, a fourth cavity and a fifth cavity are arranged in the valve shell 1, wherein one end of the first cavity is communicated with the first inlet; one end of the second chamber is communicated with the second inlet; the third chamber is respectively communicated with the fourth chamber, the fifth chamber and the outlet; the fourth chamber is connected with the first chamber, the fifth chamber is communicated with the second chamber, the first chamber and the second chamber are symmetrical about the third chamber, and the fourth chamber and the fifth chamber are symmetrical about the third chamber.
The bidirectional regulating valve core 2 is a variable cross-section shaft, a valve core conical surface 12 and a spring positioning surface are arranged on the bidirectional regulating valve core 2, and the bidirectional regulating valve core 2 spans the fourth chamber, the third chamber and the fifth chamber.
The adjusting lever 10 is arranged in the third chamber, and two ends of the adjusting lever are respectively and rotatably connected with the bidirectional adjusting valve core 2 and the piston assembly 8 through a rotating connecting pin 9.
Two ends of the spring 3 are respectively clung to the spring positioning surface and the valve core guide sleeve 4.
The piston assembly 8 spans the first chamber, the third chamber and the second chamber, and the first piston and the second piston are respectively connected with the inner wall of the first chamber and the inner wall of the second chamber in a sliding manner.
Before the high-precision flow proportional control valve is installed and used, throttling rings 7 can be respectively installed at inlets at two ends of the valve and used for controlling flow values of working media at the two ends in a rated state; if throttling and pressure reduction are not needed, the throttle ring 7 can be eliminated. The pre-tightening force of the springs 3 at the two ends of the bidirectional adjusting valve core 2 is adjusted by screwing in or screwing out the corresponding adjusting screws 6; the compression amount and the pretightening force of the springs 3 at the two ends are equal in the initial state, and the axis of the adjusting lever 10 is ensured to coincide with the central axis of the valve body. The tightening torque of the adjusting screw 6 can be adjusted according to the actual working requirements. The larger the tightening torque of the adjusting screw 6 is, the lower the sensitivity is when the flow rate ratio is adjusted; conversely, the higher the sensitivity in controlling the flow ratio adjustment.
When the high-precision flow proportional control valve works, the pressures of the working medium entering the valve at the two ends of the piston assembly 8 are P1 and P2 respectively.
When the working media at the two ends are in a rated state, the acting force of the pressure P1 on the piston assembly 8 is equal to the acting force of the pressure P2 on the piston assembly 8, the piston assembly 8 does not move, and the flowing state of the working media at the two ends in the valve is maintained.
When the working media at the two ends are influenced by external pressure supply fluctuation and the inlet flow of the working media at the left end is increased, the P1 is increased; at this time, the acting force of the pressure P1 on the piston assembly 8 is greater than the acting force of the pressure P2 on the piston assembly 8, the piston assembly 8 slides to the right, and the adjusting lever 10 rotates counterclockwise around the adjusting lever rotation fulcrum 11 under the driving of the rotation connecting pin 9, so that the bidirectional adjusting valve core 2 slides to the left. At the moment, the flow area A1 of a throttling channel 13 formed by the left end valve core conical surface 12 of the bidirectional regulating valve core 2 and the valve body channel is reduced, so that the flow of the working medium passing through the left end channel is reduced; the flow area of A2 of a throttle channel 13 formed by the valve core conical surface 12 at the right end of the bidirectional adjusting valve core 2 and the channel of the valve body is increased, so that the flow of the working medium passing through the channel at the right end is increased, and the purpose of stabilizing the flow proportion of the working medium at the two ends of the valve body is achieved. If the external pressure interference disappears, the pressure P1 is restored to the rated state, the resultant rightward hydraulic force acting on the piston assembly 8 disappears, and the bidirectional adjusting valve core 2 is only influenced by the acting force of the springs 3 at the two ends. At the moment, the force generated by the left end spring 3 of the bidirectional adjusting valve core is greater than the force generated by the right end spring 3, and the bidirectional adjusting valve core 2 integrally slides rightwards to the original rated state; and under the driving action of the rotating connecting pin 9, the adjusting lever 10 rotates clockwise around the adjusting lever rotating fulcrum 11, so that the piston assembly 8 is restored to the original state, and the adjusting lever rotating fulcrum 11 is fixed in the third chamber and is hinged with a hinge hole in the adjusting lever 10 through a pin shaft.
On the contrary, if the acting force of the pressure P2 on the piston assembly 8 is larger than the acting force of the pressure P2 on the piston assembly 8 under the influence of the external pressure fluctuation, the corresponding feedback adjustment can be performed.
The high-precision flow proportional control valve is provided with an automatic feedback adjusting mechanism which mainly comprises a piston assembly 8, an adjusting lever 9, a bidirectional adjusting valve core 10 and a spring 3, and the working medium of the high-precision flow proportional control valve is liquid or gas.
The high-precision flow proportional control valve is provided with a structure of a throttling ring 7 and an adjusting screw 6, and the flow size and the flow proportional control sensitivity can be adjusted according to the actual working condition requirements.
The high-precision flow proportional control valve can be used for dismounting and replacing corresponding parts according to the actual working condition and the part abrasion condition, and has strong applicability and maintainability.
The bidirectional adjusting valve core 2 is assembled on the valve core guide sleeve 4, and two ends of the bidirectional adjusting valve core are provided with valve core conical surfaces 12 for adjusting the area of the throttling channel 13. The spring 3 is positioned between the valve core guide sleeve 4 and the step beside the valve core conical surface 12. The adjusting screw 6 is in threaded connection with the valve shell 1 and is sealed by an O-shaped sealing ring 5.
The stressed pistons at the two ends of the piston assembly 8 can be designed into pistons with equal area according to actual working requirements, and can also be designed into pistons with different stressed area sizes (i.e. the sizes D1 and D2 in fig. 1 and fig. 2 can be equal or different).
The proportion of the rotating force arm of the adjusting lever 10 between the piston assembly 8 and the bidirectional adjusting valve core 2 can be designed into different states according to actual working requirements and sensitivity requirements, in the embodiment, the distance from the rotating fulcrum 11 of the adjusting lever to the rotating connection point of the bidirectional adjusting valve core 2 and the adjusting lever 10 is smaller than the distance from the rotating fulcrum 11 of the adjusting lever to the rotating connection point of the adjusting lever 10 and the piston assembly 8, and the rotating fulcrum 11 of the adjusting lever and the two rotating connection points are on the same straight line.
The high-precision flow proportional control valve in the embodiment is used for synchronous discharge control between two storage tanks or storage tanks, and media at two ends can be the same liquid or different liquid mixtures or gas.
The above examples are illustrative of the inventive concept and do not limit the final scope of protection, and all embodiments based on the inventive concept should fall within the scope of protection of the present invention.
Claims (10)
1. A high accuracy flow proportional control valve which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a valve housing (1), wherein the valve housing (1) is provided with a first inlet, a second inlet and an outlet, the valve housing (1) is provided with a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber, wherein,
one end of the first chamber is communicated with the first inlet;
one end of the second chamber is communicated with the second inlet;
the third chamber is respectively communicated with the fourth chamber, the fifth chamber and the outlet;
the fourth chamber is connected with the first chamber, and the fifth chamber is communicated with the second chamber;
the bidirectional regulating valve core (2) is positioned in the third cavity, the left end and the right end of the bidirectional regulating valve core (2) respectively extend into the fourth cavity and the fifth cavity, two valve core conical surfaces (12) are arranged on the surface of the bidirectional regulating valve core (2), and the two valve core conical surfaces (12) respectively form two throttling channels (13) with the inner wall of the fourth cavity and the inner wall of the fifth cavity;
the adjusting screw (6) comprises a first adjusting screw and a second adjusting screw, the first adjusting screw is in threaded connection with one end of the fourth chamber and is connected with one end of the bidirectional adjusting valve core (2), the second adjusting screw is in threaded connection with one end of the fifth chamber and is connected with the other end of the bidirectional adjusting valve core (2);
the spring (3) comprises a first spring and a second spring, the first spring is positioned in the fourth cavity and sleeved on the bidirectional adjusting valve core (2), the second spring is positioned in the fifth cavity and sleeved on the bidirectional adjusting valve core (2), the first spring is positioned between the first adjusting screw and the valve core conical surface (12), and the second spring is positioned between the second adjusting screw and the other valve core conical surface (12);
a piston assembly (8), the piston assembly (8) spanning the first chamber, the second chamber and the third chamber, the piston assembly (8) including a first piston and a second piston, the first piston being slidably connected to an inner wall of the first chamber, the second piston being slidably connected to an inner wall of the second chamber;
and two ends of the adjusting lever (10) are respectively and rotatably connected with the bidirectional adjusting valve core (2) and the piston assembly (8).
2. A high accuracy flow proportional control valve as defined in claim 1, wherein: the device is characterized by further comprising two throttle rings (7), wherein the two throttle rings (7) are detachably connected in the first cavity and the second cavity respectively.
3. A high accuracy flow proportional control valve as defined in claim 1, wherein: the bidirectional adjusting valve core is characterized by further comprising valve core guide sleeves (4), the valve core guide sleeves (4) are connected to the end faces of the adjusting screws (6), the two valve core guide sleeves (4) are in sliding fit with the inner walls of the fourth cavity and the fifth cavity respectively, the left end and the right end of the bidirectional adjusting valve core (2) are connected to the two valve core guide sleeves (4) respectively, and one end of the spring (3) is tightly attached to the valve core guide sleeves (4).
4. A high accuracy flow proportional control valve as defined in claim 1, wherein: the device is characterized by further comprising an O-shaped sealing ring (5), wherein the O-shaped sealing ring (5) is sleeved on the outer surface of the adjusting screw (6) and forms sealing with the inner wall of the fourth cavity and the inner wall of the fifth cavity.
5. A high accuracy flow proportional control valve as defined in claim 1, wherein: the surface of the bidirectional adjusting valve core (2) is provided with two spring positioning surfaces, the two spring positioning surfaces are respectively positioned between the first spring and the valve core conical surface (12) and between the second spring and the other valve core conical surface (12), and the two spring positioning surfaces are tightly attached to one end of the spring (3).
6. A high accuracy flow proportional control valve as defined in claim 1, wherein: the bidirectional adjusting valve is characterized by further comprising a rotating connecting pin (9), the rotating connecting pin (9) is respectively connected to the bidirectional adjusting valve core (2) and the piston assembly (8) in a rotating mode, a pin hole is formed in the rotating connecting pin (9), and two ends of the adjusting lever (10) are connected with the pin hole.
7. A high accuracy flow proportional control valve as defined in claim 1, wherein: the bidirectional adjusting valve is characterized by further comprising an adjusting lever rotating fulcrum (11), wherein the adjusting lever rotating fulcrum (11) is located in the third cavity and hinged to the adjusting lever (10), and a hinged point is located between the adjusting lever (10) and rotating connection points of the bidirectional adjusting valve core (2) and the piston assembly (8).
8. A high accuracy flow proportional control valve as defined in claim 1, wherein: the first and second chambers are symmetrical about a third chamber, and the fourth and fifth chambers are symmetrical about the third chamber.
9. A high accuracy flow proportional control valve as defined in claim 1, wherein: the size of the contact sectional area of the first piston and the medium is different from the size of the contact sectional area of the second piston and the medium.
10. An aircraft having a plurality of tanks or reservoirs therein, characterized in that: any two of the tanks or storage tanks are connected through the high-precision flow proportional control valve in claim 1, and the tanks or storage tanks are gas or liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458410.7A CN114185368A (en) | 2021-12-01 | 2021-12-01 | High-precision flow proportional control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458410.7A CN114185368A (en) | 2021-12-01 | 2021-12-01 | High-precision flow proportional control valve |
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| Publication Number | Publication Date |
|---|---|
| CN114185368A true CN114185368A (en) | 2022-03-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111458410.7A Pending CN114185368A (en) | 2021-12-01 | 2021-12-01 | High-precision flow proportional control valve |
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| CN (1) | CN114185368A (en) |
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|---|---|---|---|---|
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| CN107120329A (en) * | 2016-02-24 | 2017-09-01 | Mac阀门有限公司 | Proportional pressure controller with isolation valve module |
| CN110925255A (en) * | 2019-11-19 | 2020-03-27 | 宜昌宜硕塑业有限公司 | Proportional flow valve |
| CN111005907A (en) * | 2020-01-07 | 2020-04-14 | 浙江大学城市学院 | Electro-hydraulic control valve capable of regulating flow gain |
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2021
- 2021-12-01 CN CN202111458410.7A patent/CN114185368A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB930138A (en) * | 1958-06-20 | 1963-07-03 | Rene Leduc | Improvements in apparatus for mixing hot and cold liquids |
| GB1410406A (en) * | 1972-11-09 | 1975-10-15 | Beringer Hydraulik Gmbh | Valves |
| SU892247A1 (en) * | 1980-04-16 | 1981-12-23 | Казанский Ордена Трудового Красного Знамени Авиационный Институт Им.А.И.Туполева | Pressure ratio pickup |
| JPH06101778A (en) * | 1992-09-21 | 1994-04-12 | Matsushita Electric Ind Co Ltd | Mixing valves for water combination faucet |
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