CN115199808B - Pressure flow automatic control valve with high liquid level control function - Google Patents
Pressure flow automatic control valve with high liquid level control function Download PDFInfo
- Publication number
- CN115199808B CN115199808B CN202210803931.XA CN202210803931A CN115199808B CN 115199808 B CN115199808 B CN 115199808B CN 202210803931 A CN202210803931 A CN 202210803931A CN 115199808 B CN115199808 B CN 115199808B
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- Prior art keywords
- pilot valve
- valve
- pressure
- liquid level
- taking channel
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- 239000007788 liquid Substances 0.000 title claims abstract description 64
- 230000009471 action Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 25
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 239000000945 filler Substances 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/365—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a diaphragm
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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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Float Valves (AREA)
Abstract
The invention discloses a pressure flow automatic control valve with high liquid level control function, which comprises a pressure flow automatic control valve and further comprises: the high liquid level control pilot valve is communicated with the pressure flow automatic control valve through a pressure taking channel I and a pressure taking channel II; the pressure taking channel I is communicated with the oil inlet, and the pressure taking channel II is communicated with a main valve middle cavity of the pressure flow automatic control valve; the high liquid level control pilot valve is connected with the float valve, the float valve feeds back a liquid level signal in the oil tank to the high liquid level control pilot valve, when the liquid level in the oil tank does not reach a set height yet, the pressure taking channel I and the pressure taking channel II are disconnected, and the main valve of the pressure flow automatic control valve is opened to start oiling; when the liquid level in the oil tank reaches the set height, the pressure taking channel I and the pressure taking channel II are communicated, and the main valve of the pressure flow automatic control valve is closed to stop oiling.
Description
Technical Field
The invention belongs to the field of valves, and particularly relates to a pressure flow automatic control valve with a high liquid level control function.
Background
The automatic pressure and flow control valve (patent application number 202022995058.8) is an existing patent product of our company, and is a device for controlling the upper limit of pressure, dynamically adjusting flow and controlling emergency opening and closing of the oil filling port of the fuel oil filling pipeline. The pressure and flow automatic control valve can adjust the upper limit value and the flow of the pipeline pressure in real time according to the flowing condition of the pipeline in the oiling process. In an emergency state, the pressure and flow automatic control valve can be controlled to be closed quickly and is often used together with the Dimman control in the control system. The liquid level control in the oil tank of the oil filler is mainly based on the fact that an electro-hydraulic sensor is matched with an electrical system to close the oil filler or a float valve is matched with a high liquid level control valve to be automatically closed. The introduction of these two approaches can complicate the composition and control of the fuel filler piping system and increase manufacturing and maintenance costs. If the pressure flow automatic control valve has the function of high liquid level control, the cost is reduced, the function integration of the oiling process can be realized, and the operation is more convenient. The invention is based on the automatic control valve of pressure and flow, adds a high liquid level control pilot valve, and realizes the high liquid level control function by being matched with a float valve arranged at the top of the oil tank.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. An automatic pressure and flow control valve with high liquid level control function is disclosed. The technical scheme of the invention is as follows:
The pressure flow automatic control valve with the high liquid level control function comprises a pressure flow automatic control valve (1), and further comprises: the high liquid level control pilot valve (2) and the float valve (3), wherein the high liquid level control pilot valve (2) is communicated with the pressure flow automatic control valve (1) through a pressure taking channel I (4) and a pressure taking channel II (5); the pressure taking channel I (4) is communicated with the oil inlet, and the pressure taking channel II (5) is communicated with a main valve middle cavity of the pressure flow automatic control valve (1); the high liquid level control pilot valve (2) is electrically connected with the float valve (3), the float valve (3) feeds back a liquid level signal in the oil tank to the high liquid level control pilot valve (2), when the liquid level in the oil tank does not reach a set height yet, the pressure taking channel I (4) and the pressure taking channel II (5) are disconnected, and the main valve of the pressure flow automatic control valve (1) is opened to start oiling; when the liquid level in the oil tank reaches the set height, the pressure taking channel I (4) and the pressure taking channel II (5) are communicated, and the main valve of the pressure flow automatic control valve (1) is closed to stop oiling.
Further, the high liquid level control pilot valve (2) comprises a pilot valve body (6), a pilot valve core (7), a piston (8), a pilot valve inlet (9), an orifice (10), a pilot valve spring (11), a pilot valve outlet (12), a groove (13) and a balance air hole (14) which are arranged in the pilot valve body (6), wherein the pilot valve core (7) is arranged in the middle position in the pilot valve body (6), the pilot valve core (7) is connected with the piston (8), and the piston (8) is connected with the pilot valve inlet (9); the throttle hole (10) is communicated with the pilot valve inlet (9), the pilot valve spring (11) is connected with the pilot valve core (7), and the pilot valve outlet (12) is connected with the pilot valve core (7).
Further, when the medium pressure of the pilot valve inlet (9) is higher, the medium passes through the throttle hole (10) to form a pressure difference before and after the piston (8), so that the pilot valve core (7) is pushed to move leftwards against the elastic force of the pilot valve spring (11), a groove (13) between the pressure taking channel I (4) and the pressure taking channel II (5) is closed, and the two channels are disconnected; when the liquid level in the oil tank reaches a set height and the float valve (3) is closed, the pressure difference between the pilot valve outlet (12) and the pilot valve inlet (9) is quickly balanced through the throttle hole (10), the pilot valve core (7) returns to the right to the initial position under the action of the pilot valve spring (11), and the groove (13) is opened to enable the pressure taking channel I (4) and the pressure taking channel II (5) to be communicated; the pilot valve inlet (9) is connected with an oil inlet, and the pilot valve outlet (12) is connected with the inlet of the float valve (3); the balance air hole (14) is communicated with the atmosphere and used for balancing the air pressure.
Furthermore, the high liquid level control pilot valve (2) is adjacently installed and positioned with other control pilot valves or is independently installed, and when the high liquid level control pilot valve is independently installed, the pressure taking channel I (4) and the pressure taking channel II (5) are connected and fixed with a pressure taking pipeline by adopting a clamping sleeve type pipe joint.
Furthermore, the functions of the high liquid level control pilot valve (2) and other control pilot valves are not interfered with each other, and each functional module can be freely combined or independently operated.
The invention has the advantages and beneficial effects as follows:
the innovation of the invention is mainly that described in claims 2, 3. The pressure flow automatic control valve has the advantages that the function of high liquid level control is added on the basis of the functions of original upper limit control of the pressure of the oil filling port, dynamic adjustment of the flow, emergency start-stop control and the like, so that the cost is reduced, the function integration of the oil filling process can be realized, and the operation is more convenient. The high liquid level function and other functions are not interfered with each other, can be freely combined, can also work independently, can be disassembled and assembled according to actual use needs as a modularized function, and has high flexibility.
Drawings
FIG. 1 is a schematic view of the overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic illustration of the structure of a high level pilot valve;
FIG. 3 is a schematic structural view of a float valve;
In the figure: 1. a pressure flow automatic control valve; 2. a high level control pilot valve; 3. a float valve; 4. a pressure taking channel I; 5. a pressure taking channel II; 6. a pilot valve body; 7. a pilot valve core; 8. a piston; 9. a pilot valve inlet; 10. an orifice; 11. a pilot valve spring; 12. a pilot valve outlet; 13. groove; 14. balance the air holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and specifically described below with reference to the drawings in the embodiments of the present invention. The described embodiments are only a few embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
As shown in fig. 1, the pressure flow automatic control valve with the high liquid level control function mainly comprises a pressure flow automatic control valve 1, a high liquid level control pilot valve 2 and a float valve 3, wherein the high liquid level control pilot valve 2 is communicated with the pressure flow automatic control valve 1 through a pressure taking channel I4 and a pressure taking channel II 5; the pressure taking channel I4 is communicated with an oil inlet, and the pressure taking channel II 5 is communicated with a main valve middle cavity of the pressure flow automatic control valve 1; the float valve 3 feeds back a liquid level signal in the oil tank to the high liquid level control pilot valve 2, when the liquid level in the oil tank does not reach a set height yet, the pressure taking channel I4 and the pressure taking channel II 5 are disconnected, and the main valve of the pressure flow automatic control valve 1 is opened to start oiling; when the liquid level in the oil tank reaches the set height, the pressure taking channel I4 and the pressure taking channel II 5 are communicated, and the main valve of the pressure flow automatic control valve 1 is closed to stop oiling.
Preferably, the high liquid level control pilot valve 2 mainly comprises a pilot valve body 6, a pilot valve core 7, a piston 8, a pilot valve inlet 9, an orifice 10, a pilot valve spring 11 and a pilot valve outlet 12. The method is characterized in that: when the medium pressure of the pilot valve inlet 9 is higher, the medium passes through the throttle hole 10 to form pressure difference in front and back of the piston 8, so that the pilot valve core 7 is pushed to move leftwards against the elastic force of the pilot valve spring 11, a groove 13 between the pressure taking channel I4 and the pressure taking channel II 5 is closed, and the two channels are disconnected; when the liquid level in the oil tank reaches the set height and the float valve 3 is closed, the pressure difference between the pilot valve outlet 12 and the pilot valve inlet 9 is quickly balanced through the throttle orifice 10, the pilot valve core 7 returns to the right to the initial position under the action of the pilot valve spring 11, and the groove 13 is opened to connect the pressure taking channel I4 and the pressure taking channel II 5; the pilot valve inlet 9 is connected with an oil inlet, and the pilot valve outlet 12 is connected with the inlet of the float valve 3; the balance air hole 14 is connected to the atmosphere for balancing the air pressure.
Preferably, the high level pilot valve 2 has no special requirement on the installation position, and can be installed and positioned adjacent to other pilot valves or independently. When the pressure taking channel I4 and the pressure taking channel II 5 are independently installed, the clamping sleeve type pipe joint can be adopted to connect and fix the pressure taking pipeline.
Preferably, the high liquid level control pilot valve 2 and other control pilot valves have no interference with each other, and each functional module can be freely combined or independently operated.
Preferably, the seal of the present invention may be made of a rubber material or other material suitable for use as a seal ring.
Preferably, the mode that the screw plug is perforated and then fixed on the pilot valve core can be adopted, so that the direct processing of the throttle hole on the pilot valve core is avoided, the processing difficulty of the pilot valve core is reduced, and the economy in the process of post maintenance and replacement is improved.
The working principle of the invention is as follows:
The pressure flow automatic control valve (with high liquid level control function) mainly comprises a pressure flow automatic control valve, a high liquid level control pilot valve and a float valve. The high liquid level control pilot valve is communicated with the pressure flow automatic control valve through a pressure taking channel I and a pressure taking channel II; the pressure taking channel I is communicated with the oil inlet, and the pressure taking channel II is communicated with a main valve middle cavity of the pressure flow automatic control valve; the float valve feeds back a liquid level signal in the oil tank to the high liquid level control pilot valve, and when the liquid level in the oil tank does not reach a set height, the pressure taking channel I and the pressure taking channel II are disconnected, and the main valve of the pressure flow automatic control valve is opened to start oiling; when the liquid level in the oil tank reaches the set height, the pressure taking channel I and the pressure taking channel II are communicated, and the main valve of the pressure flow automatic control valve is closed to stop oiling. The high liquid level control pilot valve mainly comprises a pilot valve body, a pilot valve core, a piston, a pilot valve inlet, an orifice, a pilot valve spring and a pilot valve outlet. When the pressure of medium at the inlet of the pilot valve is higher, the medium passes through the throttling hole to form pressure difference in front and back of the piston, so that the pilot valve core is pushed to move leftwards against the elastic force of the pilot valve spring, a groove between the pressure taking channel I and the pressure taking channel II is closed, and the two channels are disconnected; when the liquid level in the oil tank reaches a set height and the float valve is closed, the pressure difference between the pilot valve outlet and the pilot valve inlet is quickly balanced through the throttle hole, the pilot valve core returns to the right to the initial position under the action of the pilot valve spring, and the groove is opened, so that the pressure taking channel I and the pressure taking channel II are communicated; the inlet of the pilot valve is connected with the oil inlet, and the outlet of the pilot valve is connected with the inlet of the float valve; the balance hole is communicated with the atmosphere and used for balancing the air pressure.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The above examples should be understood as illustrative only and not limiting the scope of the invention. Various changes and modifications to the present invention may be made by one skilled in the art after reading the teachings herein, and such equivalent changes and modifications are intended to fall within the scope of the invention as defined in the appended claims.
Claims (3)
1. The utility model provides a take high liquid level control function's pressure flow automatic control valve, includes pressure flow automatic control valve (1), its characterized in that still includes: the high liquid level control pilot valve (2) and the float valve (3), wherein the high liquid level control pilot valve (2) is communicated with the pressure flow automatic control valve (1) through a pressure taking channel I (4) and a pressure taking channel II (5); the pressure taking channel I (4) is communicated with the oil inlet, and the pressure taking channel II (5) is communicated with a main valve middle cavity of the pressure flow automatic control valve (1); the high liquid level control pilot valve (2) is connected with the float valve (3), the float valve (3) feeds back a liquid level signal in the oil tank to the high liquid level control pilot valve (2), when the liquid level in the oil tank does not reach a set height yet, the pressure taking channel I (4) and the pressure taking channel II (5) are disconnected, and the main valve of the pressure flow automatic control valve (1) is opened to start oiling; when the liquid level in the oil tank reaches the set height, the pressure taking channel I (4) and the pressure taking channel II (5) are communicated, and the main valve of the pressure flow automatic control valve (1) is closed to stop oiling;
the high liquid level control pilot valve (2) comprises a pilot valve body (6), a pilot valve core (7), a piston (8), a pilot valve inlet (9), an orifice (10), a pilot valve spring (11), a pilot valve outlet (12), a bevel (13) and a balance air hole (14), wherein the pilot valve core (7) is arranged in the middle position in the pilot valve body (6), the pilot valve core (7) is connected with the piston (8), and the piston (8) is connected with the pilot valve inlet (9); the throttle hole (10) is communicated with the pilot valve inlet (9), the pilot valve spring (11) is connected with the pilot valve core (7), and the pilot valve outlet (12) is connected with the pilot valve core (7);
When the medium pressure of the pilot valve inlet (9) is higher, the medium passes through the throttle hole (10) to form a pressure difference before and after the piston (8), so that the pilot valve core (7) is pushed to move leftwards against the elasticity of the pilot valve spring (11), a groove (13) between the pressure taking channel I (4) and the pressure taking channel II (5) is closed, and the two channels are disconnected; when the liquid level in the oil tank reaches a set height and the float valve (3) is closed, the pressure difference between the pilot valve outlet (12) and the pilot valve inlet (9) is quickly balanced through the throttle hole (10), the pilot valve core (7) returns to the right to the initial position under the action of the pilot valve spring (11), and the groove (13) is opened to enable the pressure taking channel I (4) and the pressure taking channel II (5) to be communicated; the pilot valve inlet (9) is connected with an oil inlet, and the pilot valve outlet (12) is connected with the inlet of the float valve (3); the balance air hole (14) is communicated with the atmosphere and used for balancing the air pressure.
2. The automatic pressure flow control valve with the high liquid level control function according to claim 1, wherein the high liquid level control pilot valve (2) is adjacently installed and positioned with other control pilot valves or is independently installed, and when the automatic pressure flow control valve is independently installed, the pressure taking channel I (4) and the pressure taking channel II (5) are connected and fixed with a pressure taking pipeline by adopting a clamping sleeve type pipe joint.
3. The automatic pressure flow control valve with high liquid level control function according to claim 1, wherein the high liquid level control pilot valve (2) and other pilot valve functions are not interfered with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210803931.XA CN115199808B (en) | 2022-07-07 | 2022-07-07 | Pressure flow automatic control valve with high liquid level control function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210803931.XA CN115199808B (en) | 2022-07-07 | 2022-07-07 | Pressure flow automatic control valve with high liquid level control function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115199808A CN115199808A (en) | 2022-10-18 |
| CN115199808B true CN115199808B (en) | 2024-06-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210803931.XA Active CN115199808B (en) | 2022-07-07 | 2022-07-07 | Pressure flow automatic control valve with high liquid level control function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115199808B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03125088A (en) * | 1989-10-09 | 1991-05-28 | Maezawa Ind Inc | Two-stage changeover liquid level adjusting valve |
| JPH11325305A (en) * | 1998-05-20 | 1999-11-26 | Yokota Seisakusho:Kk | Liquid level control valve gear |
| CN102644778A (en) * | 2012-02-07 | 2012-08-22 | 中国人民解放军总后勤部油料研究所 | Automatic control valve for liquid level |
| CN104406045A (en) * | 2014-11-14 | 2015-03-11 | 重庆川庆科技发展有限公司 | High-liquid-level valve for bidirectional flowing of oil tank |
| CN204459339U (en) * | 2015-02-04 | 2015-07-08 | 重庆川庆科技发展有限公司 | High liquid level (HLL) Emergeny Cutoff Valves |
| CN110406832A (en) * | 2019-08-01 | 2019-11-05 | 中国人民解放军陆军勤务学院 | A kind of filling anti-overflow control device of the built-in bottom section canned for oil tank |
| CN112112977A (en) * | 2020-10-13 | 2020-12-22 | 北京航空工程技术研究中心 | Pilot-operated type flow control valve in pipe |
| CN214331651U (en) * | 2020-12-14 | 2021-10-01 | 重庆川庆科技发展有限公司 | Built-in high liquid level valve for oil tank truck |
-
2022
- 2022-07-07 CN CN202210803931.XA patent/CN115199808B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03125088A (en) * | 1989-10-09 | 1991-05-28 | Maezawa Ind Inc | Two-stage changeover liquid level adjusting valve |
| JPH11325305A (en) * | 1998-05-20 | 1999-11-26 | Yokota Seisakusho:Kk | Liquid level control valve gear |
| CN102644778A (en) * | 2012-02-07 | 2012-08-22 | 中国人民解放军总后勤部油料研究所 | Automatic control valve for liquid level |
| CN104406045A (en) * | 2014-11-14 | 2015-03-11 | 重庆川庆科技发展有限公司 | High-liquid-level valve for bidirectional flowing of oil tank |
| CN204459339U (en) * | 2015-02-04 | 2015-07-08 | 重庆川庆科技发展有限公司 | High liquid level (HLL) Emergeny Cutoff Valves |
| CN110406832A (en) * | 2019-08-01 | 2019-11-05 | 中国人民解放军陆军勤务学院 | A kind of filling anti-overflow control device of the built-in bottom section canned for oil tank |
| CN112112977A (en) * | 2020-10-13 | 2020-12-22 | 北京航空工程技术研究中心 | Pilot-operated type flow control valve in pipe |
| CN214331651U (en) * | 2020-12-14 | 2021-10-01 | 重庆川庆科技发展有限公司 | Built-in high liquid level valve for oil tank truck |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115199808A (en) | 2022-10-18 |
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