CN219914789U - Pilot valve leakage testing device - Google Patents
Pilot valve leakage testing device Download PDFInfo
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- CN219914789U CN219914789U CN202321254438.3U CN202321254438U CN219914789U CN 219914789 U CN219914789 U CN 219914789U CN 202321254438 U CN202321254438 U CN 202321254438U CN 219914789 U CN219914789 U CN 219914789U
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000007789 sealing Methods 0.000 claims description 25
- 238000003825 pressing Methods 0.000 claims description 16
- 239000003292 glue Substances 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Examining Or Testing Airtightness (AREA)
Abstract
The utility model relates to the technical field of pilot valve testing, in particular to a pilot valve leakage testing device, which comprises a base, a testing plate, an air cylinder, an electric box and an air path component, wherein the testing plate is vertically arranged on the base, and one side of the testing plate is provided with a tested workpiece; the cylinder is used for compacting the tested workpiece; the electrical box is used for switching on and off the electric quantity of the tested workpiece; the gas circuit component is respectively connected with each channel of the tested workpiece and the second working channel, the leakage amount of the pilot valve is judged by using the flowmeter, and if the leakage occurs, the specific position of the leakage of the pilot valve can be judged by coating soapy water on the surface of the pilot valve; when the leakage is eliminated, the specific position of the internal leakage is required to be judged, when the power is not on, if the working port or the exhaust port has gas output, the gas leakage of the first glue blocking part is indicated, when the power is on, the working port has gas output, and when the exhaust port has gas output, the gas leakage of the second glue blocking part is indicated, the leakage position can be quickly found, the operation is simple, the use is convenient, and the detection efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of pilot valve testing, in particular to a pilot valve leakage testing device.
Background
Solenoid valves may be used to control the flow of fluids, such as gases, liquids, vapors, and the like. In industrial automation control systems, solenoid valves are typically used with sensors, actuators and controllers to effect control of an automated production line. In view of the above application areas, solenoid valves must have certain sealing properties to prevent fluid leakage or penetration. The common electromagnetic valve is divided into a main valve and an auxiliary valve, wherein the auxiliary valve refers to a pilot valve, and one main valve corresponds to one pilot valve or one main valve corresponds to two pilot valves.
At present, no device for testing the leakage of the pilot part of the electromagnetic valve exists, and the leakage can be generally judged by a method of coating soapy water on the surface of the electromagnetic valve, so that the specific leakage point and the internal leakage amount are difficult to judge and quantify.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The utility model provides a pilot valve leakage testing device, so that the problems in the background technology are effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a pilot valve leak testing apparatus, comprising:
the base is horizontally arranged on the workbench;
the test board is vertically arranged on the base, and one side of the test board is provided with a tested workpiece;
the air cylinder is arranged at one side far away from the test plate and is used for compacting the tested workpiece;
the electric appliance box is provided with the bottom of the tested workpiece and is used for switching on and off the electric quantity of the tested workpiece;
the gas circuit assembly comprises a gas inlet, a gas outlet, a first working port and a second working port, the gas circuit assembly is respectively connected with a gas inlet channel, a gas outlet channel, a first working channel and a second working channel of a tested workpiece, and the gas inlet is provided with a flowmeter.
Further, the base plate is vertically arranged on the base, one side of the base plate is provided with the air cylinder, the other side of the base plate is provided with a first hand-rotating valve and a second hand-rotating valve, the first hand-rotating valve is used for controlling telescopic movement of the air cylinder, and the second hand-rotating valve is used for controlling gas to enter the on-off state of the test plate.
Further, the first hand-operated valve and the second hand-operated valve are connected with an external air path.
Further, a first pipeline is arranged between the second rotary valve and the air inlet.
Further, a waterproof gasket or a waterproof plug is arranged between the electrical box and the tested workpiece.
Further, a positioning rod is arranged between the test board and the tested workpiece and used for compacting and positioning the tested workpiece.
Further, a push plate is arranged in the extending channel of the air cylinder, a first pressure plate is arranged on the side face of the push rod of the air cylinder, a second pressure plate is arranged on the side face of the first pressure plate, and the second pressure plate is arranged on the opposite side of the sealing ring of the tested workpiece.
Further, an avoidance groove is formed in one side, close to the tested workpiece, of the test plate and is used for avoiding the bulge on the tested product.
Further, the electrical box is provided with a jack, the tested workpiece is provided with a socket, and the socket is arranged in the jack.
Further, the side face of the test board is provided with a special-shaped sealing ring of the tested workpiece, the special-shaped sealing ring is used for sealing gas between all channels, and the side face of the test board needs to be leveled.
The beneficial effects of the utility model are as follows: the utility model is provided with a base, a test board, an air cylinder, an electric box and an air path component; the test board is vertically arranged on the base, and one side of the test board is provided with a tested workpiece; the cylinder is used for compacting the tested workpiece; the electric box is provided with the bottom of the tested workpiece and is used for switching on and off the electric quantity of the tested workpiece; the gas circuit assembly comprises a gas inlet, a gas outlet, a first working port and a second working port, which are respectively connected with a gas inlet channel, a gas outlet channel, a first working channel and a second working channel of a tested workpiece, wherein the gas inlet is provided with a flowmeter; when the leakage is eliminated, the specific position of the internal leakage is required to be judged, when the power is not applied, if the first working port, the second working port or the exhaust port has gas output, the first glue blocking position is indicated to leak gas, when the power is applied, the first working port and the second working port have gas output, when the exhaust port has gas output, the second glue blocking position is indicated to leak gas, the leakage position can be found rapidly, the operation is simple, the use is convenient, and the detection efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of a pilot leakage test apparatus in embodiment 1;
FIG. 2 is a schematic view of the pilot leakage test apparatus of embodiment 1 at another angle (with the piping removed);
FIG. 3 is a front view of the pilot leakage test apparatus of example 1;
FIG. 4 is a schematic structural view of the workpiece to be tested in example 1;
fig. 5 is a sectional view of the workpiece to be measured along the iron core in embodiment 1;
fig. 6 is a schematic structural view of the electrical box and the test board in embodiment 1;
FIG. 7 is a cross-sectional view of the test piece of example 1 mounted on the test plate along the center of the locating lever;
FIG. 8 is a front view of the air circuit assembly;
FIG. 9 is a schematic structural view of the air circuit assembly;
FIG. 10 is a schematic diagram of the pilot leakage test apparatus (with piping removed) in example 2;
fig. 11 is a schematic structural view of the electrical box mounting and testing board in embodiment 2.
Reference numerals: 1. a base; 11. a base plate; 12. a first rotary valve; 13. a second rotary valve; 2. a test board; 21. an avoidance groove; 3. the air circuit component; 31. an air inlet; 32. an exhaust port; 33. a first work port; 34. a second work port; 35. a plug; 36. a first pipe; 37. a positioning rod; 4. a cylinder; 41. a push plate; 42. a first platen; 43. a second pressing plate; 5. an electrical box; 51. a waterproof gasket; 52. a waterproof plug; 53. a jack; 54. a socket; 6. a workpiece to be tested; 61. a first pilot valve; 62. a second pilot valve; 63. an air intake passage; 64. an exhaust passage; 65. a first working channel; 66. a second working channel; 67. a seal ring; 68. a protrusion; 69. positioning holes; 71. a first glue plug; 72. a second glue plug; 73. an iron core; 74. and an upper cavity.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated as being "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1:
as shown in fig. 1 to 9: a pilot valve leak testing apparatus, comprising:
the base 1 is horizontally arranged on the workbench;
the test board 2 is vertically arranged on the base 1, and one side of the test board 2 is provided with a tested workpiece 6;
the air cylinder 4 is arranged on one side far away from the test board 2 and is used for compacting the tested workpiece 6;
the electric box 5 is arranged at the bottom of the tested workpiece 6 and is used for switching on and off the electric quantity of the tested workpiece 6;
the air path assembly 3, the air path assembly 3 includes an air inlet 31, an air outlet 32, a first working port 33 and a second working port 34, which are respectively connected with an air inlet channel 63, an air outlet channel 64, a first working channel 65 and a second working channel 66 of the workpiece 6 to be tested, and the air inlet 31 is provided with a flowmeter.
The device comprises a base 1, a test board 2, an air cylinder 4, an electric box 5 and an air path component 3; the test board 2 is vertically arranged on the base 1, and one side of the test board 2 is provided with a tested workpiece 6; the cylinder 4 is used for compacting the tested workpiece 6; the electrical box 5 is provided with the bottom of the tested workpiece 6 and is used for switching on and off the electric quantity of the tested workpiece 6; the air path assembly 3 comprises an air inlet 31, an air outlet 32, a first working port 33 and a second working port 34, which are respectively connected with an air inlet channel 63, an air outlet channel 64, a first working channel 65 and a second working channel 66 of the tested workpiece 6, the air inlet 31 is provided with a flowmeter (not shown in the figure), the leakage amount of the pilot valve is judged by the flowmeter, and if the leakage occurs, the surface of the pilot valve can be coated with soapy water to judge the specific position of the leakage of the pilot valve; when the external leakage is eliminated, the specific position of the internal leakage needs to be judged, when the power is not applied, if the first working port 33, the second working port 34 or the exhaust port 32 has gas output, the first working port 33 and the second working port 34 are indicated to have gas output, when the power is applied, the first working port 33 and the second working port 34 have gas output, and when the exhaust port 32 has gas output, the second working port 72 is indicated to have gas leakage, so that the leakage position can be found quickly, the operation is simple, the use is convenient, and the detection efficiency is improved.
As a preference of the above embodiment, the base plate 11 is vertically arranged on the base 1, one side of the base plate 11 is provided with the air cylinder 4, the other side is provided with the first hand-rotating valve 12 and the second hand-rotating valve 13, the first hand-rotating valve 12 is used for controlling the telescopic movement of the air cylinder 4, and the second hand-rotating valve 13 is used for controlling the on-off of the air entering the test board 2.
Specifically, the first hand-rotating valve 12 is a two-position five-way hand-rotating valve for controlling the cylinder 4 to press the tested workpiece 6, and the second hand-rotating valve 13 is a two-position three-way hand-rotating valve for enabling gas to flow into the tested workpiece 6 through the test plate 2, so that control of movement of the cylinder 4 and control of the gas through the test plate 2 are facilitated.
In this embodiment, the first rotary valve 12 and the second rotary valve 13 are connected to an external air passage, thereby ensuring normal operation of the cylinder 4 and testing the amount of air used.
Wherein, be equipped with first pipeline 36 between second hand-operated valve 13 and the air inlet 31, make things convenient for gas to flow into air inlet 31 through first pipeline 36 through second hand-operated valve 13 to the measurement of measuring work piece 6 is carried out.
As a preferable example of the above embodiment, a waterproof gasket 51 is provided between the electrical box 5 and the workpiece 6 to be measured.
When the leakage position is detected, soapy water is smeared on the surface of the pilot valve to be detected, in order to prevent the soapy water from flowing into the electric box 5 from the jack 53, a waterproof gasket 51 is arranged between the electric box 5 and the workpiece 6 to be detected, and the soapy water is prevented from flowing into the electric box 5, so that the occurrence of safety accidents is avoided.
In this embodiment, a positioning rod 37 is disposed between the test board 2 and the tested workpiece 6, and is used for compressing and positioning the tested workpiece 6.
The pilot valve to be tested is arranged above the test box, one side of the pilot valve to be tested with the special-shaped sealing ring 67 is arranged on the side face of the test board 2, the positioning rod 37 passes through the test board 2 and passes through the positioning hole 69 of the pilot valve to be tested by utilizing the positioning hole 69 of the pilot valve to be tested, and the positioning of the pilot valve to be tested is used for ensuring that the air inlet 31, the air outlet 32, the first working port 33 and the second working port 34 of the air circuit assembly 3 are positioned more accurately with the positions of the air inlet channel 63, the air outlet channel 64, the first working channel 65 and the second working port of the workpiece 6 to be tested respectively, so that the special-shaped sealing ring 67 of the pilot valve to be tested is positioned accurately, and the accuracy of the communication between the air circuit inside the air circuit assembly 3 and the pilot valve to be tested is ensured.
The extending channel of the air cylinder 4 is provided with a push plate 41, a first pressing plate 42 is arranged on the side face of the push rod of the air cylinder 4, a second pressing plate 43 is arranged on the side face of the first pressing plate 42, and the second pressing plate 43 is arranged on the opposite side of the sealing ring 67 of the tested workpiece 6.
The push plate 41 of the air cylinder 4 is a plate with the air cylinder 4, the second pressing plate 43 is a middle conversion plate, the third pressing plate is fixed on the second pressing plate 43 through screws, the position of the second pressing plate 43 is arranged on the opposite side of the special-shaped sealing ring 67 of the pilot valve to be tested, and when the air cylinder 4 drives the push plate 41, the second pressing plate 43 and the third pressing plate to press the opposite side of the special-shaped sealing ring 67 of the pilot valve to be tested, the extrusion force received by the special-shaped sealing ring 67 is uniform, and a better sealing effect is achieved.
Preferably, in the above embodiment, the side of the test board 2 near the tested workpiece 6 is provided with a avoiding groove 21 for avoiding the protrusion 68 on the tested product.
In order to prevent the deformation of the sealing ring 67 from being influenced by the bulge 68 on the side with the special-shaped sealing ring 67 of the pilot valve to be tested, leakage is caused between the pilot valve to be tested and the test board 2, and the test result is inaccurate, the avoidance groove 21 is formed, and the sealing effect is better.
In the embodiment, the electrical box 5 is provided with a jack 53, the tested workpiece 6 is provided with a jack 54, and the jack 54 is arranged in the jack 53, so that the tested pilot valve is conveniently connected with electricity, and the tightness of the pilot valve in the working state is tested.
The side of the test board 2 is provided with a special-shaped sealing ring 67 of the tested workpiece 6, the special-shaped sealing ring 67 is used for sealing gas between all channels, and the side of the test board 2 needs to be leveled.
The side surface of the test board 2 is sealed with the tested pilot valve through the special-shaped sealing ring 67 of the tested pilot valve, and the gas is independently circulated between all channels through the pressed deformation of the sealing ring 67, so that the flatness of the side surface of the test board 2 close to the sealing ring 67 is important.
Example 2:
as shown in fig. 10 and 11, unlike in embodiment 1, only one pilot valve is tested, and at this time, one insertion hole 53 of the electrical box 5, which does not receive the workpiece 6 to be tested, needs to be provided with a waterproof plug 52, and when the leak position is detected, soapy water is prevented from flowing into the electrical box 5, and the electrical box 5 is prevented from being damaged.
One pilot valve can be tested alone or two pilot valves can be tested together, and if leakage exists, the problem of which pilot valve can be positioned quickly.
The testing method is simple, and the tested workpiece 6 can be tested only by pushing the workpiece tightly by the air cylinder 4 after being positioned;
as shown in fig. 5, in the cross-sectional view of the pilot valve to be tested, air flows in from the port, when the spring applies upward pressure to the movable iron core 73, the air flow is blocked by the first glue plug 71, the pilot valve should not have any leakage, and whether the glue plug is leaked or not can be known by observing whether the two working ports of the test board 2 and the air outlet 32 are leaked or not. When the pilot valve is electrified, the movable iron core 73 is sucked downwards, at the moment, air flows into the upper cavity 74, both working ports are air, at the moment, the second glue plug 72 is pressed downwards to plug the air outlet 32, and whether leakage exists at the second glue plug 72 can be known by observing the air outlet 32.
The test method comprises the following steps of firstly placing the tested workpiece 6 at the position shown in fig. 7, positioning the tested workpiece by a positioning rod 37, opening a first rotary valve 12 to enable a cylinder 4 to compress the tested workpiece 6, then opening a second rotary valve 13 to enable air to flow into the tested workpiece 6 through a test board 2, at the moment, arranging a flowmeter at an air inlet 31 to judge the leakage amount of the pilot valve, and if the leakage occurs, coating soapy water on the surface of the pilot valve to judge the specific position of the leakage of the pilot valve; if no obvious bubble exists on the surface, the leakage of the internal seal of the pilot valve can be judged, when the leakage is eliminated, the specific position of the internal leakage is needed to be judged, when the power is not applied, if the first working port 33, the second working port 34 or the exhaust port 32 has gas output, the leakage of the first glue plug 71 is indicated, when the power is applied, the gas output of the first working port 33 and the second working port 34 is indicated, when the gas output of the exhaust port 32 is indicated, the leakage of the second glue plug 72 is indicated, the leakage position can be quickly found, the operation is simple, the use is convenient, and the detection efficiency is improved.
It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. A pilot valve leak testing apparatus, comprising:
the base (1) is horizontally arranged on the workbench;
the test board (2), the said test board (2) is set up vertically on the said base (1), one side of the said test board (2) has measured the work piece (6);
the air cylinder (4) is arranged on one side far away from the test plate (2) and is used for compressing the tested workpiece (6);
the electric appliance box (5), the bottom of the detected workpiece (6) is arranged at the electric appliance box (5), and the electric appliance box is used for switching on and off the electric quantity of the detected workpiece (6);
the gas circuit assembly (3), gas circuit assembly (3) are including air inlet (31), gas vent (32), first work mouth (33) and second work mouth (34), link to each other with inlet channel (63), exhaust passage (64), first work channel (65) and second work channel (66) of measured work piece (6) respectively, air inlet (31) are equipped with the flowmeter.
2. The pilot valve leakage testing device according to claim 1, wherein a base plate (11) is vertically arranged on the base (1), the cylinder (4) is arranged on one side of the base plate (11), a first rotary valve (12) and a second rotary valve (13) are arranged on the other side of the base plate, the first rotary valve (12) is used for controlling telescopic movement of the cylinder (4), and the second rotary valve (13) is used for controlling on-off of gas entering the testing plate (2).
3. A pilot valve leakage testing device according to claim 2, characterized in that the first (12) and the second (13) rotary valves are connected to an external gas circuit.
4. A pilot valve leakage testing device according to claim 2, characterized in that a first conduit (36) is arranged between the second rotary valve (13) and the air inlet (31).
5. The pilot valve leakage testing device according to claim 1, characterized in that a waterproof gasket (51) or a waterproof plug (52) is arranged between the electrical box (5) and the tested workpiece (6).
6. A pilot valve leakage testing device according to claim 1, characterized in that a positioning rod (37) is arranged between the testing plate (2) and the tested workpiece (6) for pressing and positioning the tested workpiece (6).
7. The pilot valve leakage testing device according to claim 1, wherein the extending channel of the air cylinder (4) is provided with a push plate (41), a first pressing plate (42) is arranged on the side surface of the push rod of the air cylinder (4), a second pressing plate (43) is arranged on the side surface of the first pressing plate (42), and the second pressing plate (43) is arranged on the opposite side of a sealing ring (67) of the tested workpiece (6).
8. The pilot valve leakage testing device according to claim 1, wherein the side of the testing plate (2) close to the tested workpiece (6) is provided with a avoiding groove (21) for avoiding a protrusion (68) on the tested product.
9. The pilot valve leakage testing device according to claim 1, characterized in that the electrical box (5) is provided with a jack (53), the tested workpiece (6) is provided with a socket (54), and the socket (54) is arranged in the jack (53).
10. Pilot valve leakage testing device according to any of claims 1-9, characterized in that the side of the testing plate (2) is provided with a profiled sealing ring (67) of the tested workpiece (6), the profiled sealing ring (67) is used for gas sealing between the channels, and the side of the testing plate (2) needs to be leveled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321254438.3U CN219914789U (en) | 2023-05-23 | 2023-05-23 | Pilot valve leakage testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321254438.3U CN219914789U (en) | 2023-05-23 | 2023-05-23 | Pilot valve leakage testing device |
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| Publication Number | Publication Date |
|---|---|
| CN219914789U true CN219914789U (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321254438.3U Active CN219914789U (en) | 2023-05-23 | 2023-05-23 | Pilot valve leakage testing device |
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| Country | Link |
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| CN (1) | CN219914789U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347041A (en) * | 2023-12-04 | 2024-01-05 | 济宁落陵春辉机械制造有限公司 | Pilot valve four-channel testing device for gas-liquid pressurization |
-
2023
- 2023-05-23 CN CN202321254438.3U patent/CN219914789U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347041A (en) * | 2023-12-04 | 2024-01-05 | 济宁落陵春辉机械制造有限公司 | Pilot valve four-channel testing device for gas-liquid pressurization |
| CN117347041B (en) * | 2023-12-04 | 2024-02-02 | 济宁落陵春辉机械制造有限公司 | Pilot valve four-channel testing device for gas-liquid pressurization |
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