CN113503377B - High-efficiency sealing valve of heat storage combustion device - Google Patents
High-efficiency sealing valve of heat storage combustion device Download PDFInfo
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- CN113503377B CN113503377B CN202111058652.7A CN202111058652A CN113503377B CN 113503377 B CN113503377 B CN 113503377B CN 202111058652 A CN202111058652 A CN 202111058652A CN 113503377 B CN113503377 B CN 113503377B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/205—Sealing effected by the flowing medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0647—Spindles or actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0689—Packings between housing and plug
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses a high-efficiency sealing valve of a heat storage combustion device, which comprises a valve body, wherein a valve core is connected in a matching manner at the center position in the valve body, primary pressing sealing devices are arranged in the valve body and are respectively positioned at a flow inlet and a flow outlet, a fluid through hole is formed in the center position in the valve core, connecting flanges are arranged at two ends of the valve body and are respectively positioned at the flow inlet and the flow outlet, a valve rod is arranged at the center position of the top of the valve core, the surface of the valve rod is connected with the top of the valve body in a matching manner, and a secondary pressing sealing device is arranged in the valve rod and corresponds to the position in the valve core. The efficient sealing valve of the heat storage combustion device achieves an efficient sealing effect, can efficiently seal fluid, reduces the leakage condition caused by pressure, is not easy to loosen, has a good sealing effect, prolongs the service life of the valve, and improves the service performance.
Description
Technical Field
The invention relates to the technical field of sealing valves, in particular to a high-efficiency sealing valve of a heat storage combustion device.
Background
The heat accumulating type combustion technology can realize the ultimate recovery of the waste heat of the flue gas, has the advantages of high efficiency, energy conservation, low pollution emission and the like, can solve the contradiction between low yield and high consumption in the heat processing process, and is the most widely used energy-saving and environment-friendly combustion technology in the industrial furnace at the present stage. The heat accumulating type burner is the most energy-saving burner at present and has very important effects on energy conservation and consumption reduction. In the non-ferrous metal industry, non-ferrous metal smelting furnaces, holding furnaces and the like, most of the non-ferrous metal smelting furnaces and holding furnaces use heat accumulating type burners. In the forging heating, a heat accumulating type burner has also been used for most of the forging heating. The regenerative combustion technology is widely applied to continuous industrial furnaces which take a stable state as a leading factor, such as a push steel type continuous steel rolling heating furnace, a stepping type continuous heating furnace and the like.
At present, the sealing valve of the conventional regenerative combustion device has poor sealing effect, so that the fluid is easy to overflow, the fluid leaks, and when the valve is closed, the valve is easy to be influenced by the pressure of the fluid, so that the fluid leaks from the connecting gap of the internal structure, the service life of the valve is also influenced by the pressure leakage, and the service performance is reduced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an efficient sealing valve of a heat storage combustion device, which solves the problems that the sealing valve of the traditional heat storage combustion device has poor sealing effect, so that fluid is easy to overflow, the fluid leaks, and when the valve is closed, the valve is easy to be influenced by the pressure of the fluid, so that the fluid leaks from a connecting gap of an internal structure, the service life of the valve is influenced by the pressure leakage, and the service performance is reduced.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a high-efficiency sealing valve of a heat storage combustion device comprises a valve body, wherein a flow inlet and a flow outlet are respectively arranged at two ends of the valve body, a valve core is connected at the center position inside the valve body in a matched manner, primary pressing sealing devices are respectively arranged inside the valve body and at the positions of the flow inlet and the flow outlet, a fluid through hole is formed in the center position inside the valve core, connecting flanges are respectively arranged at the two ends of the valve body and at the positions of the flow inlet and the flow outlet, a valve rod is arranged at the center position of the top of the valve core, the surface of the valve rod is connected with the top of the valve body in a matched manner, a secondary pressing sealing device is arranged in the valve rod and at the position corresponding to the inside of the valve core, and a handle is arranged at the top end of the valve rod;
the secondary pressing sealing device is provided with a pressure plate device, a rectangular elastic bag and a plurality of sealing devices, the rectangular elastic bag is arranged inside the valve rod and is positioned at the position of the pressure plate device, and the plurality of sealing devices are arranged at the top of the surface of the valve core;
the pressing plate device is provided with a T-shaped pressing piece, a friction convex point and a ball, the friction convex point is arranged on the surface of the T-shaped pressing piece, and the ball is arranged at the edge position of the surface of the T-shaped pressing piece.
Preferably, the primary pressing and sealing device is provided with a slide rod pressing piece, an elastic bag ring, a ring-shaped air groove and a first elastic sealing ring, the slide rod pressing piece is connected to the end portion of the valve body in a sliding mode and located at the position of the connecting flange, the elastic bag ring is arranged inside the valve body and close to the end portion of the slide rod pressing piece, the ring-shaped air groove is formed in the bottom of the inner wall of the valve body and close to the valve core, and the first elastic sealing ring is arranged on the inner wall of the valve body and located at the position of the ring-shaped air groove.
Preferably, the elastic bag ring is communicated with the ring-shaped air groove, and a sliding groove matched with the sliding rod pressing piece is formed in the valve body and in the position of the connecting flange.
Preferably, the pressure plate device is arranged inside the valve rod, and the plurality of sealing devices are connected with the rectangular elastic bag in a matching mode.
Preferably, the T-shaped pressing piece is connected with the valve rod in a sliding mode, and a sliding groove matched with the T-shaped pressing piece is formed in the valve rod and located on the surface of the valve rod.
Preferably, the multi-sealing device is provided with a peak-valley type air groove and a second elastic sealing ring, the peak-valley type air groove is formed in the top of the surface of the valve core, the peak-valley type air groove is connected with the rectangular elastic bag, and the second elastic sealing ring is arranged on the top of the surface of the valve core and is located at the peak-valley type air groove.
(III) advantageous effects
The invention provides a high-efficiency sealing valve of a heat accumulation combustion device. The method has the following beneficial effects:
the efficient sealing valve of the heat storage combustion device can efficiently seal fluid through the valve body, the flow inlet, the flow outlet, the valve core, the primary pressing sealing device, the fluid through hole, the connecting flange, the valve rod, the secondary pressing sealing device and the handle, reduces the leakage condition caused by pressure, is not easy to loosen, has good sealing effect, prolongs the service life of the valve and improves the use performance.
(II), this hot combustion device's high-efficient seal valve, through the slide bar pressing member, elasticity bag circle, the annular gas pocket, first elasticity sealing washer, when the valve body is connected through flange and heat accumulation combustion apparatus, receive the pressure effect when connecting this moment, make the slide bar pressing member press the elasticity bag circle, extrude inside the annular gas pocket with its inside air, along with the continuous increase of gas pressure, utilize atmospheric pressure to make first elasticity sealing washer inflation, and then closely laminate with the surface of case, and then reach sealed effect, make full use of when the installation is fixed produced pressure, when fixed firm, can improve holistic sealed effect.
(III), the high-efficiency sealing valve of the hot combustion device comprises a pressure plate device, a rectangular elastic bag, a plurality of sealing devices, a peak valley type gas groove and a second elastic sealing ring, when the valve needs to be closed, the valve core is rotated ninety degrees by a handle to achieve the closing effect, meanwhile, the pressure plate device can rotate along with the valve rod, and under the pressing effect of the top of the inner wall of the valve body, the pressure plate device can press the rectangular elastic bag to enable the gas inside the rectangular elastic bag to enter the peak valley type gas groove, the second elastic sealing ring is expanded by air pressure and tightly attached to the inner wall of the valve body to perform sealing again, so that the multi-sealing effect is achieved, the influence of fluid pressure is reduced, the leakage situation is not easy to occur, the structure can be skillfully connected together, the whole device can perform sealing again when the valve is closed, and the high-safety and reliability are achieved, the service performance is improved.
(IV), this high-efficient seal valve of hot combustion apparatus, through T shape pressing member, the friction bump, the ball, when the valve is opened, fluid through-hole and influent stream mouth, the outflowing port intercommunication, the friction bump can increase frictional force simultaneously, T shape pressing member has been increased to valve rod wrench movement power, make its stability good, the difficult condition that rocks that appears, when the valve rod is when rotating, T shape pressing member also most rotates, and it is spacing along with the inner wall of valve body, make T shape pressing member receive and press, to the inside slow movement of valve rod, apply the pressing force on the rectangle elasticity bag, and the ball can roll, frictional resistance when reducing the drive, utilize the interrelation between the structure, interact, realize multiple functions, usability has been improved.
Drawings
Fig. 1 is a schematic view of the overall structure in a high-efficiency sealing valve of a regenerative combustion apparatus according to the present invention;
fig. 2 is a schematic view of the internal structure in the high-efficiency sealing valve of the regenerative combustion apparatus of the present invention;
fig. 3 is a schematic structural view of a primary pressing sealing device in the high-efficiency sealing valve of the regenerative combustion device according to the present invention;
fig. 4 is a schematic structural view of a secondary pressing sealing device in the high-efficiency sealing valve of the regenerative combustion device according to the present invention;
fig. 5 is a schematic view of the structure of a platen device in the high-efficiency sealing valve of the regenerative combustion apparatus according to the present invention;
FIG. 6 is a schematic structural diagram of a multi-seal device in the high-efficiency seal valve of the regenerative combustion device according to the present invention;
fig. 7 is a sectional view a-a in fig. 2 of the high-efficiency sealing valve of the regenerative combustion apparatus of the present invention.
In the figure: the valve comprises a valve body 1, a flow inlet 2, a flow outlet 3, a valve core 4, a primary pressing sealing device 5, a fluid through hole 6, a connecting flange 7, a valve rod 8, a secondary pressing sealing device 9, a handle 10, a sliding rod pressing piece 51, an elastic bag ring 52, an annular air groove 53, a first elastic sealing ring 54, a pressure plate 91, a rectangular elastic bag 92, a multi-channel sealing device 93, a 911T-shaped pressing piece 912, friction bumps 913, balls, a 931 peak-valley air groove and a 932 second elastic sealing ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-7, the present invention provides a technical solution: a high-efficiency sealing valve of a heat storage combustion device comprises a valve body 1, wherein a flow inlet 2 and a flow outlet 3 are respectively arranged at two corresponding ends of the valve body 1, a valve core 4 is connected at the center position in the valve body 1 in a matching way, a primary pressing sealing device 5 is respectively arranged in the valve body 1 and at the positions of the flow inlet 2 and the flow outlet 3, a fluid through hole 6 is arranged at the center position in the valve core 4, a connecting flange 7 is respectively arranged at the two ends of the valve body 1 and at the positions of the flow inlet 2 and the flow outlet 3, a valve rod 8 is arranged at the center position of the top of the valve core 4, the surface of the valve rod 8 is connected with the top of the valve body 1 in a matching way, a secondary pressing sealing device 9 is arranged in the valve rod 8 and at the position corresponding to the inside of the valve core 4, a handle 10 is arranged at the top end of the valve rod 8, the fluid can be efficiently sealed, the leakage caused by pressure is reduced, and the phenomenon of looseness is not easy to occur, the sealing effect is good, the service life of the valve is prolonged, and the service performance is improved.
The second embodiment:
the primary pressing and sealing device 5 is provided with a slide rod pressing piece 51, an elastic bag ring 52, a ring-shaped air groove 53 and a first elastic sealing ring 54, the slide rod pressing piece 51 is connected to the end part of the valve body 1 in a sliding manner and is positioned at the position of the connecting flange 7, the elastic bag ring 52 is arranged inside the valve body 1 and is close to the end part of the slide rod pressing piece 51, the ring-shaped air groove 53 is arranged at the bottom of the inner wall of the valve body 1 and is close to the valve core 4, the first elastic sealing ring 54 is arranged on the inner wall of the valve body 1 and is positioned at the position of the ring-shaped air groove 53, when the valve body 1 is connected with a heat storage combustion device through the connecting flange 7, the pressure effect during connection is received, so that the slide rod pressing piece 51 presses the elastic bag ring 52, the air inside the elastic bag ring is extruded into the ring-shaped air groove 53, and the first elastic sealing ring 54 is expanded by air pressure along with the continuous increase of the air pressure and is tightly jointed with the surface of the valve core 4, thereby achieving the sealing effect.
The third embodiment is as follows:
the secondary pressing and sealing device 9 is provided with a pressure plate device 91, a rectangular elastic bag 92 and a plurality of sealing devices 93, the pressure plate device 91 is arranged inside the valve rod 8, the rectangular elastic bag 92 is arranged inside the valve rod 8 and located at the position of the pressure plate device 91, the plurality of sealing devices 93 are arranged at the top of the surface of the valve core 4, and the plurality of sealing devices 93 are connected with the rectangular elastic bag 92 in a matched mode.
The multi-sealing device 93 is provided with a peak-valley type air groove 931 and a second elastic sealing ring 932, the peak-valley type air groove 931 is arranged at the top of the surface of the valve core 4, the peak-valley type air groove 931 is connected with the rectangular elastic bag 92, the second elastic sealing ring 932 is arranged at the top of the surface of the valve core 4 and is located at the position of the peak-valley type air groove 931, when the valve needs to be closed, the valve core 4 is rotated ninety degrees by the handle 10 to the valve rod 8, so as to achieve the closing effect, meanwhile, the pressure plate device 91 can rotate along with the valve rod 8, under the pressing effect of the top of the inner wall of the valve body 1, the pressure plate device 91 can press the rectangular elastic bag 92, so that the air inside the rectangular elastic bag 92 enters the peak-valley type air groove 931, the second elastic sealing ring 932 is expanded by air pressure and is tightly attached to the inner wall of the valve body 1, so as to perform sealing once again, thereby achieving the multi-sealing effect and reducing the influence of fluid pressure, the leakage is not easy to occur.
The fourth embodiment is as follows:
the pressure plate device 91 is provided with a T-shaped pressing piece 911, a friction convex point 912 and a ball 913, the T-shaped pressing piece 911 is connected with the valve rod 8 in a sliding mode, the friction convex point 912 is arranged on the surface of the T-shaped pressing piece 911, the ball 913 is arranged at the edge position of the surface of the T-shaped pressing piece 911, when the valve is opened, the fluid through hole 6 is communicated with the fluid inlet 2 and the fluid outlet 3, meanwhile, the friction convex point 912 can increase friction force, the twisting force of the T-shaped pressing piece 911 on the valve rod 8 is increased, the stability of the valve rod 8 is good, the shaking situation is not prone to occurring, when the valve rod 8 rotates, the T-shaped pressing piece 911 also rotates at the maximum value, the T-shaped pressing piece 911 is limited along with the inner wall of the valve body 1, the T-shaped pressing piece 911 is pressed, the T-shaped pressing piece moves slowly towards the inside of the valve rod 8, the pressing force is applied to the rectangular elastic bag 92, and the ball 913 can roll and reduce the friction resistance during driving.
When the valve is required to be closed, the valve rod 8 is rotated ninety degrees by the handle 10 to realize the closing effect, meanwhile, the pressure plate device 91 rotates along with the valve rod 8, and under the pressing action of the top of the inner wall of the valve body 1, the pressure plate device 91 presses the rectangular elastic bag 92 to enable the gas inside the rectangular elastic bag to enter the peak-valley type gas groove 931, the second elastic sealing ring 932 is expanded by air pressure and is tightly attached to the inner wall of the valve body 1 for sealing again, so that the multi-sealing effect is realized, the influence of fluid pressure is reduced, the leakage situation is not easy to occur, when the valve is opened, the fluid through hole 6 is communicated with the fluid inlet 2 and the fluid outlet 3, meanwhile, the friction bump 912 can increase the friction force, the twisting force of the T-shaped pressing piece 911 on the valve rod 8 is increased, the stability is good, the shaking situation is not easy to occur, when the valve rod 8 rotates, the T-shaped pressing piece 911 also rotates at the maximum value and is limited along with the inner wall of the valve body 1, the T-shaped pressing piece 911 is pressed, the T-shaped pressing piece moves slowly towards the inside of the valve rod 8, the pressing force is applied to the rectangular elastic bag 92, the ball 913 can roll, the friction resistance during driving is reduced, and the mutual connection and interaction between the structures are utilized to realize multiple functions, the service performance is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A high-efficient seal valve of heat accumulation burner, includes valve body (1), its characterized in that: the two ends of the valve body (1) are respectively provided with a fluid inlet (2) and a fluid outlet (3), a valve core (4) is matched and connected at the center position in the valve body (1), a primary pressing sealing device (5) is arranged in the valve body (1) and is respectively positioned at the position of the inflow opening (2) and the outflow opening (3), a fluid through hole (6) is arranged at the central position inside the valve core (4), connecting flanges (7) are respectively arranged at the positions of the inlet (2) and the outlet (3) at the two ends of the valve body (1), a valve rod (8) is arranged at the center of the top of the valve core (4), the surface of the valve rod (8) is connected with the top of the valve body (1) in a matching way, a secondary pressing sealing device (9) is arranged in the valve rod (8) at a position corresponding to the inner part of the valve core (4), and a handle (10) is arranged at the top end of the valve rod (8);
the secondary pressing sealing device (9) is provided with a pressure plate device (91), a rectangular elastic bag (92) and a plurality of sealing devices (93), the rectangular elastic bag (92) is arranged inside the valve rod (8) and located at the position of the pressure plate device (91), and the plurality of sealing devices (93) are arranged at the top of the surface of the valve core (4);
the pressing plate device (91) is provided with a T-shaped pressing piece (911), friction convex points (912) and balls (913), the friction convex points (912) are arranged on the surface of the T-shaped pressing piece (911), and the balls (913) are arranged at the edge position of the surface of the T-shaped pressing piece (911);
the pressure plate device (91) is arranged in the valve rod (8), and the multi-channel sealing device (93) is connected with the rectangular elastic bag (92) in a matched mode.
2. The high-efficiency sealing valve for a regenerative combustion device according to claim 1, wherein: the primary pressing sealing device (5) is provided with a sliding rod pressing piece (51), an elastic bag ring (52), a ring-shaped air groove (53) and a first elastic sealing ring (54), the sliding rod pressing piece (51) is connected to the end portion of the valve body (1) in a sliding mode and located at the position of the connecting flange (7), the elastic bag ring (52) is arranged inside the valve body (1) and close to the end portion of the sliding rod pressing piece (51), the ring-shaped air groove (53) is formed in the bottom of the inner wall of the valve body (1) and close to the valve core (4), and the first elastic sealing ring (54) is arranged on the inner wall of the valve body (1) and located at the position of the ring-shaped air groove (53).
3. The high-efficiency sealing valve for a regenerative combustion device according to claim 2, wherein: the elastic bag ring (52) is communicated with the ring-shaped air groove (53), and a sliding groove matched with the sliding rod pressing piece (51) is formed in the valve body (1) and positioned at the connecting flange (7).
4. The high-efficiency sealing valve for a regenerative combustion device according to claim 1, wherein: the T-shaped pressing piece (911) is connected with the valve rod (8) in a sliding mode, and a sliding groove matched with the T-shaped pressing piece (911) is formed in the valve rod (8) and located on the surface.
5. The high-efficiency sealing valve for a regenerative combustion device according to claim 1, wherein: multichannel sealing device (93) are equipped with peak valley type air groove (931), second elastic sealing ring (932), the surperficial top position at case (4) is seted up in peak valley type air groove (931), be connected between peak valley type air groove (931) and rectangle elasticity bag (92), second elastic sealing ring (932) set up the position at the surperficial top of case (4) and be located peak valley type air groove (931).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111058652.7A CN113503377B (en) | 2021-09-10 | 2021-09-10 | High-efficiency sealing valve of heat storage combustion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111058652.7A CN113503377B (en) | 2021-09-10 | 2021-09-10 | High-efficiency sealing valve of heat storage combustion device |
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| CN113503377A CN113503377A (en) | 2021-10-15 |
| CN113503377B true CN113503377B (en) | 2021-11-23 |
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| CN202111058652.7A Active CN113503377B (en) | 2021-09-10 | 2021-09-10 | High-efficiency sealing valve of heat storage combustion device |
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| CN114352720A (en) * | 2022-02-18 | 2022-04-15 | 江苏多乐热能设备有限公司 | Pressure container and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1824980A (en) * | 2005-02-21 | 2006-08-30 | 江苏神通阀门有限公司 | Air bag valve |
| KR101006834B1 (en) * | 2008-06-16 | 2011-01-12 | (주)삼진제이엠씨 | Valve having spheric opening/closing means with improved seal performance |
| CN106609859A (en) * | 2015-10-26 | 2017-05-03 | 德阳九鼎智远知识产权运营有限公司 | An air-tight seal ball valve |
| CN109404557A (en) * | 2018-12-20 | 2019-03-01 | 启东市冶金机械有限公司 | Flexible sealing pulverized coal spraying ball valve |
| CN210290847U (en) * | 2019-08-16 | 2020-04-10 | 随州市力拓汽车配件有限公司 | Novel four-position T-shaped three-way ball valve |
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