CN219434329U - Automatic testing device for initial and final pressure of direct-travel control valve - Google Patents
Automatic testing device for initial and final pressure of direct-travel control valve Download PDFInfo
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- CN219434329U CN219434329U CN202320167287.1U CN202320167287U CN219434329U CN 219434329 U CN219434329 U CN 219434329U CN 202320167287 U CN202320167287 U CN 202320167287U CN 219434329 U CN219434329 U CN 219434329U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model relates to an automatic testing device for the initial and final pressure of a straight travel control valve. The utility model comprises a feedback mechanism, wherein the feedback mechanism comprises a laser feedback plate connected with a push rod of a pneumatic executing mechanism; the measuring mechanism comprises a laser range finder, and the laser range finder obtains a valve position change value of the direct-travel control valve by measuring the distance between the laser range finder and the laser feedback plate; the pneumatic control system comprises an electric proportional valve and a digital display pressure gauge, wherein an air outlet of the electric proportional valve is connected to an air inlet of the pneumatic execution mechanism, and the digital display pressure gauge is connected between the air outlet of the electric proportional valve and the air inlet of the pneumatic execution mechanism; the electronic control system comprises a control module, wherein the control module is used for controlling the electric proportional valve according to the valve position change value and the air source pressure value so as to increase the air source pressure entering the actuating mechanism. The utility model improves the quality of the products of the straight-travel control valve by measuring the initial and final pressure of the straight-travel control valve.
Description
Technical Field
The utility model relates to the technical field of measurement, in particular to a direct-travel control valve start-end pressure automatic testing device.
Background
The control valve is widely applied to industries such as petrochemical industry, and the performance of the control valve influences the operation effect of the device, and in the performance of the control valve, the initial and final pressure of the valve is usually ignored, and the automatic detection means of the initial and final pressure of the control valve is less, so that the main reasons are as follows: 1. the traditional method for detecting the starting and ending pressure of the control valve is a manual method, a filtering pressure reducing valve is operated, the starting and ending pressure value of the control valve is measured by a method for controlling the input air source pressure of the pneumatic actuating mechanism, and a pointer type pressure gauge is arranged on the pressure reducing valve. During reading, visual errors can exist, so that errors occur in the observed pressure reading, and the measurement accuracy is affected; 2. an operator can observe the valve position change of the control valve by visual observation, so that the operator can not perceive the instantaneous tiny change of the valve position by visual observation and can not make accurate judgment instantaneously; 3. the stroke specification of the straight stroke control valve is more, and a general detection tool is lacked. The existing detection efficiency is low, the detection means is original, the error of the detection result is large, and the performance of the valve cannot be effectively ensured.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problem that the method for detecting the starting and ending pressure of the control valve by the traditional manual detection is improved, and the starting and ending pressure of the control valve can be automatically detected.
In order to solve the technical problems, the utility model provides a direct-travel control valve start and end pressure automatic testing device, which comprises a valve body, a valve rod and a pneumatic executing mechanism, wherein the valve rod is connected with the valve body, and the pneumatic executing mechanism comprises a pneumatic executing mechanism push rod which is connected with the valve rod and drives the valve rod to act; the automatic test equipment includes:
the feedback mechanism comprises a laser feedback plate connected with a pneumatic actuator push rod, and the pneumatic actuator push rod can drive the laser feedback plate to move together when pushing the valve rod of the valve;
the measuring mechanism comprises a laser range finder arranged at one side of the laser feedback plate, and the laser range finder obtains the valve position change value of the direct-travel control valve by measuring the distance between the laser range finder and the laser feedback plate;
the pneumatic control system comprises an electric proportional valve and a digital display pressure gauge, an air source flows into an air inlet of the electric proportional valve, an air outlet of the electric proportional valve is connected to an air inlet of the pneumatic execution mechanism, and the digital display pressure gauge is connected between the air outlet of the electric proportional valve and the air inlet of the pneumatic execution mechanism and is used for acquiring an air source pressure value output from the electric proportional valve to the pneumatic execution mechanism;
the electric control system comprises a control module which is respectively connected with the electric proportional valve and the laser range finder, and the control module is used for controlling the electric proportional valve according to the valve position change value and the air source pressure value so as to increase the air source pressure entering the actuating mechanism.
In one embodiment of the utility model, the pneumatic actuator push rod is coupled to the valve stem by a half.
In one embodiment of the utility model, the pneumatic actuator is further connected with a pneumatic actuator bracket, the measuring mechanism further comprises a magnetic gauge stand magnetically attracted to the actuator bracket, the laser range finder is connected to the magnetic gauge stand through a hand screw, and laser of the laser range finder is perpendicularly arranged on the laser feedback plate.
In one embodiment of the utility model, the pneumatic control system further comprises a filter pressure reducing valve arranged between the air source and the electric proportional valve.
In one embodiment of the utility model, the feedback mechanism further comprises a crab jaw and a connecting plate, wherein the crab jaw and the laser feedback plate are respectively connected to two ends which are oppositely arranged along the length direction of the connecting plate, the crab jaw is connected with a linear adjusting knob, and the crab jaw is arranged on the push rod of the pneumatic actuating mechanism and is fixed through the linear adjusting knob.
In one embodiment of the utility model, the connecting plate is provided with an adjusting groove in the length direction, and the crab clamp and the laser feedback plate are connected to the adjusting groove through adjusting bolts.
In one embodiment of the utility model, the laser range finder can convert a receiving value between the laser range finder and the laser feedback board into a 4-20 mA analog signal and transmit the signal to the control module; the digital display pressure gauge can convert the air source pressure value output to the pneumatic actuating mechanism into a 4-20 mA analog quantity signal and transmit the analog quantity signal to the control module.
In one embodiment of the utility model, the electronic control system further comprises a touch screen connected with the control module, wherein the touch screen is used for setting the rated stroke of the straight stroke control valve, and when the push rod of the pneumatic execution mechanism drives the valve rod of the valve to act, the control module records that the air source pressure value of the digital display pressure gauge is the initial pressure value of the straight stroke control valve; continuously increasing the air source pressure through the electric proportional valve, and recording the air source pressure value of the digital display pressure gauge at the moment through the control module when the direct travel control valve acts to the rated travel, wherein the air source pressure value is the end point pressure value of the direct travel control valve; the control module can transmit the initial pressure value and the final pressure value to the touch screen for display, and judge whether the touch screen is qualified or not.
In one embodiment of the utility model, the control module comprises a PLC module, the electric control system further comprises a safety grid and a power line which are respectively connected with the PLC module, the power line is provided with an air switch, a switching power supply is arranged between the power line and the safety grid, and the laser range finder and the digital display pressure gauge are respectively connected with the PLC module through the safety grid.
In one embodiment of the present utility model, the automatic test device further includes a control box, and the pneumatic control system and the electric control system are both disposed in the control box.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
according to the automatic testing device for the initial and final pressure of the direct travel control valve, the valve position change of the direct travel control valve is converted into the receiving change between the laser range finder and the laser feedback plate, the laser range finder has high measuring precision and strong anti-interference capability, the valve position change of the control valve can be effectively measured, and the measured value can be converted into a 4-20 mA analog quantity signal; the electric proportional valve controls the air source pressure output to the pneumatic actuating mechanism, and the electric proportional valve realizes stepless continuous control of the outlet pressure in an electric proportional mode, and has the advantages of high sensitivity, quick response, good stability and small influence of temperature change; the digital display pressure gauge measures the air source pressure output by the electric proportional valve in real time, has high measurement accuracy, and can convert the measured value into a 4-20 mA analog quantity signal. The utility model has compact integral structure, convenient operation and portability; the valve is suitable for straight-stroke control valves of various specifications; and the product quality of the straight-stroke control valve is improved by measuring the initial and final pressure of the straight-stroke control valve.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
Fig. 1 is a schematic view of the overall structure of the device of the present utility model.
Fig. 2 is a front view of the feedback mechanism of the device of the present utility model.
Fig. 3 is a front view of the measuring mechanism of the device of the present utility model.
Fig. 4 is a schematic diagram of a pneumatic control system of the apparatus of the present utility model.
Fig. 5 is a schematic diagram of the electrical control system of the device of the present utility model.
FIG. 6 is a schematic diagram of the installation of the measuring mechanism and feedback mechanism of the device of the present utility model.
Fig. 7 is a front view of the control box of the apparatus of the present utility model.
Description of the specification reference numerals: 1. a feedback mechanism; 11. crab clamp; 111. an in-line adjusting knob; 12. an adjusting bolt; 13. a connecting plate; 14. a laser feedback board; 2. a measuring mechanism; 21. a laser range finder; 22. a magnetic gauge stand; 23. screwing the screw by hand; 3. a pneumatic control system; 31. a filter pressure reducing valve; 32. an electrical proportional valve; 33. a digital display pressure gauge; 34. a pneumatic actuator; 4. an electric control system; 41. an air switch; 42. a control module; 43. a safety grating; 44. a switching power supply; 45. an air source input interface; 46. an air source output interface; 47. a touch screen; 48. a socket; 5. a straight travel control valve; 51. a pneumatic actuator bracket; 52. a pneumatic actuator push rod; 53. hafu; 54. a valve stem; 6. and a control box.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.
In the present utility model, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present utility model, and do not indicate or imply that the technical features must be in 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 present utility model, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present utility model, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present utility model, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 7, the automatic testing device for the start and end pressures of a straight travel control valve of the present utility model includes a valve body, a valve stem 54, and a pneumatic actuator 34, wherein the valve stem 54 is connected to the valve body, and the pneumatic actuator 34 includes a pneumatic actuator push rod 52 connected to the valve stem 54 and driving the valve stem 54 to act; the automatic test equipment includes:
a feedback mechanism 1, wherein the feedback mechanism 1 comprises a laser feedback plate 14 connected to a pneumatic actuator push rod 52, and the pneumatic actuator push rod 52 can drive the laser feedback plate 14 to move together when pushing a valve rod 54;
the measuring mechanism 2 comprises a laser distance meter 21 arranged on one side of the laser feedback plate 14, and the laser distance meter 21 obtains the valve position change value of the straight travel control valve 5 by measuring the distance between the laser distance meter 21 and the laser feedback plate 14;
the pneumatic control system 3 comprises an electric proportional valve 32 and a digital display pressure gauge 33, wherein an air source flows into an air inlet of the electric proportional valve 32, an air outlet of the electric proportional valve 32 is connected to an air inlet of the pneumatic actuator 34, and the digital display pressure gauge 33 is connected between the air outlet of the electric proportional valve 32 and the air inlet of the pneumatic actuator 34 and is used for acquiring the air source pressure value output from the electric proportional valve 32 to the pneumatic actuator 34;
the electronic control system 4, the electronic control system 4 comprises a control module 42 respectively connected with the electric proportional valve 32 and the laser range finder 21, and the control module 42 is used for controlling the electric proportional valve 32 according to the valve position change value and the air source pressure value so as to increase the air source pressure entering the actuating mechanism.
Specifically, the pneumatic actuator push rod 52 is connected to the valve stem 54 through a half 53.
Specifically, the pneumatic actuator 34 is further connected with a pneumatic actuator bracket 51, the measuring mechanism 2 further includes a magnetic gauge stand 22 magnetically attracted to the actuator bracket, the laser range finder 21 is connected to the magnetic gauge stand 22 through a hand screw 23, and laser of the laser range finder 21 is perpendicularly irradiated on the laser feedback board 14.
Specifically, the pneumatic control system 3 further comprises a filtering pressure reducing valve 31 arranged between the air source and the electric proportional valve 32. The air source pressure output to the pneumatic actuator 34 is controlled by the electric proportional valve 32 in the pneumatic control system 3, the electric proportional valve 32 realizes stepless continuous control of the outlet pressure in an electric proportional mode, the sensitivity is high, the response is quick, the stability is good, the influence by temperature change is small, the air source pressure output by the electric proportional valve 32 is measured in real time by the digital display pressure meter 33, and the measuring precision is high.
Specifically, the feedback mechanism 1 further includes a crab clamp 11 and a connecting plate 13, the crab clamp 11 and the laser feedback plate 14 are respectively connected to two ends that are oppositely disposed along the length direction of the connecting plate 13, the crab clamp 11 is connected with a word adjusting knob 111, and the crab clamp 11 is clamped on the pneumatic actuator push rod 52 and is fixed by the word adjusting knob 111.
Specifically, the connecting plate 13 is provided with an adjusting groove in the length direction, and the crab clamp 11 and the laser feedback plate 14 are both connected to the adjusting groove through an adjusting bolt 12. The crab clamp 11 and the position of the laser on the connecting plate 13 are convenient to adjust.
Specifically, the laser rangefinder 21 can convert the received value between the laser rangefinder 21 and the laser feedback board 14 into a 4-20 ma analog signal, and transmit the signal to the control module 42; the digital display pressure gauge 33 can convert the air source pressure value output to the pneumatic actuator 34 into a 4-20 mA analog signal, and transmit the analog signal to the control module 42.
Specifically, the electronic control system 4 further includes a touch screen 47 connected to the control module 42, where the touch screen 47 is used to set a rated stroke of the straight-stroke control valve 5, and when the pneumatic actuator push rod 52 drives the valve stem 54 to act, the control module 42 records that the air source pressure value of the digital display pressure gauge 33 is the initial pressure value of the straight-stroke control valve 5; continuously increasing the air source pressure through the electric proportional valve 32, and recording the air source pressure value of the digital display pressure gauge 33 at the moment through the control module 42 when the straight travel control valve 5 moves to the moment of the rated travel, wherein the air source pressure value is the end point pressure value of the straight travel control valve 5; the control module 42 can transmit the start pressure value, the end pressure value to the touch screen 47 and display, and determine whether it is acceptable. The touch screen 47 may be used to manipulate the control module 42, set parameters, and monitor data; the rated stroke of the control valve can be set on the touch screen 47 and is interacted with the control module 42, so that the control module 42 operates, automatic detection is realized, and the touch screen 47 is firm and durable, quick in response and visual in picture.
Specifically, the control module 42 includes a PLC module, the electric control system 4 further includes a safety grid 43 and a power line connected with the PLC module, the power line is provided with an air switch 41, a switching power supply 44 is provided between the power line and the safety grid 43, and the laser range finder 21 and the digital display pressure gauge 33 are connected with the PLC module through the safety grid 43 respectively. The electrical proportional valve 32 is controlled by the PLC module, signals of the laser range finder 21 and the digital display pressure gauge 33 are received, and the PLC module has stable signals, good reliability and easy programming.
Specifically, the automatic testing device further comprises a control box 6, the pneumatic control system 3 and the electric control system 4 are both arranged on the control box 6, and the control box 6 is used as a substrate to bear the electric control system 4 and the pneumatic control system 3. The control box 6 can be provided with an air source input interface 45, an air source output interface 46 and a socket 48 for connecting the laser range finder 21 according to the requirements.
The utility model controls the electric proportional valve 32 by the output signal of the PLC module, receives the 4-20 mA analog quantity signal of the digital display pressure gauge 33, receives the 4-20 mA analog quantity signal of the laser range finder 21, controls the electric proportional valve 32 by the PLC module, slowly increases the air source pressure entering the actuating mechanism, measures the air source pressure output to the pneumatic actuating mechanism 34 in real time by the digital display pressure gauge 33, converts the pressure value into the 4-20 mA analog quantity signal, and transmits the 4-20 mA analog quantity signal to the PLC module, meanwhile, the laser range finder 21 measures the valve position change value, converts the receiving value between the laser range finder 21 and the laser feedback plate 14 into the 4-20 mA analog quantity signal, and transmits the 4-20 mA analog quantity signal to the PLC module, sets the rated stroke of the control valve on the touch screen 47, controls the operation program of the PLC module, automatically starts detection, and records the pressure value of the digital display pressure gauge 33 transmitted at the moment as the valve rod 54 of the valve rod is the initial pressure value of the control valve; the electrical proportional valve 32 continues to slowly increase the air source pressure, when the control valve is operated to the moment of the rated stroke, the PLC module records that the pressure value of the digital display pressure gauge 33 is the end pressure value of the control valve, and the PLC module transmits the measured start/end pressure value to the touch screen 47 for display, and automatically judges whether the control valve is qualified or not.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.
Claims (10)
1. The automatic testing device for the initial and final pressure of the straight-line control valve comprises a valve body, a valve rod (54) and a pneumatic actuating mechanism (34), wherein the valve rod (54) is connected to the valve body, and the pneumatic actuating mechanism (34) comprises a pneumatic actuating mechanism push rod (52) which is connected with the valve rod (54) and drives the valve rod (54) to act; the automatic testing device is characterized by comprising:
the feedback mechanism (1), the feedback mechanism (1) comprises a laser feedback plate (14) connected to a pneumatic actuator push rod (52), and the pneumatic actuator push rod (52) can drive the laser feedback plate (14) to move together when pushing a valve rod (54);
the measuring mechanism (2), the measuring mechanism (2) comprises a laser range finder (21) arranged at one side of the laser feedback plate (14), and the laser range finder (21) obtains a valve position change value of the direct-drive control valve (5) by measuring the distance between the laser range finder and the laser feedback plate (14);
the pneumatic control system (3), the pneumatic control system (3) comprises an electric proportional valve (32) and a digital display pressure gauge (33), an air source flows into an air inlet of the electric proportional valve (32), an air outlet of the electric proportional valve (32) is connected to an air inlet of the pneumatic actuator (34), and the digital display pressure gauge (33) is connected between the air outlet of the electric proportional valve (32) and the air inlet of the pneumatic actuator (34) and is used for acquiring an air source pressure value output from the electric proportional valve (32) to the pneumatic actuator (34);
the electric control system (4), the electric control system (4) comprises a control module (42) which is respectively connected with the electric proportional valve (32) and the laser range finder (21), and the control module (42) is used for controlling the electric proportional valve (32) according to the valve position change value and the air source pressure value so as to increase the air source pressure entering the actuating mechanism.
2. The automatic testing device for the start-end pressure of a straight-line control valve according to claim 1, wherein the pneumatic actuator push rod (52) is connected with the valve rod (54) through a half (53).
3. The automatic testing device for the initial and final pressure of the straight travel control valve according to claim 1, wherein the pneumatic actuator (34) is further connected with a pneumatic actuator bracket (51), the measuring mechanism (2) further comprises a magnetic gauge stand (22) magnetically attracted to the actuator bracket, the laser range finder (21) is connected to the magnetic gauge stand (22) through a hand screw (23), and laser of the laser range finder (21) is perpendicularly irradiated on the laser feedback plate (14).
4. The automatic testing device for the start-end pressure of the straight-line control valve according to claim 1, wherein the pneumatic control system (3) further comprises a filtering pressure reducing valve (31) arranged between the air source and the electric proportional valve (32).
5. The automatic testing device for the initial and final pressure of the straight travel control valve according to claim 1, wherein the feedback mechanism (1) further comprises a crab clamp (11) and a connecting plate (13), the crab clamp (11) and the laser feedback plate (14) are respectively connected to two ends which are oppositely arranged along the length direction of the connecting plate (13), the crab clamp (11) is connected with a word adjusting knob (111), and the crab clamp (11) is clamped on the push rod (52) of the pneumatic actuating mechanism and is fixed through the word adjusting knob (111).
6. The automatic testing device for the initial and final pressure of the straight travel control valve according to claim 5, wherein the connecting plate (13) is provided with an adjusting groove in the length direction, and the crab clamp (11) and the laser feedback plate (14) are connected to the adjusting groove through adjusting bolts (12).
7. The automatic testing device for the start-end pressure of the direct-travel control valve according to claim 1, wherein the laser range finder (21) can convert a received value between the laser range finder and the laser feedback plate (14) into a 4-20 mA analog signal and transmit the signal to the control module (42); the digital display pressure gauge (33) can convert the air source pressure value output to the pneumatic actuating mechanism (34) into a 4-20 mA analog quantity signal and transmit the signal to the control module (42).
8. The automatic testing device for the start-end pressure of the straight travel control valve according to claim 1, wherein the electronic control system (4) further comprises a touch screen (47) connected with the control module (42), the touch screen (47) is used for setting the rated travel of the straight travel control valve (5), and when the pneumatic actuator push rod (52) drives the valve stem (54) to act, the gas source pressure value of the digital display pressure gauge (33) is recorded by the control module (42) to be the initial pressure value of the straight travel control valve (5); continuously increasing the air source pressure through the electric proportional valve (32), and recording the air source pressure value of the digital display pressure gauge (33) at the moment through the control module (42) when the direct-travel control valve (5) moves to the moment of the rated travel, wherein the air source pressure value is the end point pressure value of the direct-travel control valve (5); the control module (42) can transmit the initial pressure value and the final pressure value to the touch screen (47) for display, and judge whether the initial pressure value and the final pressure value are qualified or not.
9. The automatic testing device for the start-end pressure of the straight-line control valve according to claim 1, wherein the control module (42) comprises a PLC module, the electric control system (4) further comprises a safety grid (43) and a power line which are respectively connected with the PLC module, the power line is provided with an air switch (41), a switching power supply (44) is arranged between the power line and the safety grid (43), and the laser range finder (21) and the digital display pressure gauge (33) are respectively connected with the PLC module through the safety grid (43).
10. The automatic testing device for the start-end pressure of the straight-line control valve according to claim 1, further comprising a control box (6), wherein the pneumatic control system (3) and the electric control system (4) are both arranged in the control box (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320167287.1U CN219434329U (en) | 2023-02-03 | 2023-02-03 | Automatic testing device for initial and final pressure of direct-travel control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320167287.1U CN219434329U (en) | 2023-02-03 | 2023-02-03 | Automatic testing device for initial and final pressure of direct-travel control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219434329U true CN219434329U (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320167287.1U Active CN219434329U (en) | 2023-02-03 | 2023-02-03 | Automatic testing device for initial and final pressure of direct-travel control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219434329U (en) |
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2023
- 2023-02-03 CN CN202320167287.1U patent/CN219434329U/en active Active
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