CN211059452U - Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof - Google Patents
Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof Download PDFInfo
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- CN211059452U CN211059452U CN201922197826.2U CN201922197826U CN211059452U CN 211059452 U CN211059452 U CN 211059452U CN 201922197826 U CN201922197826 U CN 201922197826U CN 211059452 U CN211059452 U CN 211059452U
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Abstract
The utility model discloses a safety interruption device of a butterfly valve actuating mechanism and the butterfly valve actuating mechanism thereof, the safety interruption device of the butterfly valve actuating mechanism comprises one or two groups of a first electromagnetic valve, a third electromagnetic valve, a second electromagnetic valve and a fourth electromagnetic valve, an oil port A of the first electromagnetic valve is communicated with an oil port P of the second electromagnetic valve through a series pipe, and the oil port A of the second electromagnetic valve is communicated with a return pipe; an oil port A of the third electromagnetic valve is communicated with an oil port P of the fourth electromagnetic valve through another series pipe, and the oil port A of the fourth electromagnetic valve is communicated with a return pipe; oil ports A of the second electromagnetic valve and the fourth electromagnetic valve are communicated with a fourth pressure relief pipe, and the fourth pressure relief pipe is communicated with an oil way oil return port T; the oil ports P of the first electromagnetic valve and the third electromagnetic valve are respectively communicated with a second pressure relief pipe, and the second pressure relief pipe is communicated with a first pressure gauge through a pressure measuring pipe. The utility model discloses a design of a plurality of series-parallel solenoid valves, arbitrary solenoid valve maloperation, refusing to move can not influence the normal action of safety interruption function.
Description
Technical Field
The utility model relates to a valve technology especially relates to a butterfly valve actuating mechanism safety interruption device and a butterfly valve actuating mechanism thereof.
Background
The actuating mechanism is a single-acting piston hydraulic cylinder which is used for realizing the opening and closing of a valve. In extreme cases, if serious system or valve failure occurs, the valve needs to be closed quickly in time, and the valve is quickly returned and closed by means of a relevant electromagnetic valve switch at present. The prior art mainly adopts the design of fig. 1:
in fig. 1, 1.1 stop valve, 2 filters, 3.1, 3.2, 3.3 check valves, 4 first pressure gauge stop valves, 5 first pressure gauges, 6.1, 6.2 orifices, 7.1, 7.2 solenoid valves, 8 butterfly valve actuators, and 9 two-way valves (one-way conduction, which can only be conducted from butterfly valve actuators to oil path T).
An oil inlet of a butterfly valve actuator 8 is communicated with an outlet B of an electromagnetic valve 7.1, an outlet A of the electromagnetic valve 7.1 is sealed, an oil inlet P of the electromagnetic valve 7.1 is communicated with an oil inlet P of hydraulic oil after being connected in series with a one-way valve 3.1, a filter 2 and a stop valve 1.1, and an oil return port T of the electromagnetic valve 7.1 is communicated with an oil way T through a first pressure relief pipe;
the first pressure gauge is used for detecting hydraulic pressure between the check valve 3.1 and the throttling hole 6.1, and a pipeline between the check valve 3.1 and the throttling hole 6.1 is connected with the check valve 3.2 in series and then is connected to an oil inlet P of the electromagnetic valve 7.2;
an oil outlet of the butterfly valve actuator 8 is communicated with an oil inlet of the two-way valve 9, a first outlet of the two-way valve 9 is communicated with an oil path T, a second outlet of the two-way valve 9 is communicated with an oil inlet B of the electromagnetic valve 7.2, an oil return port T of the electromagnetic valve 7.2 is communicated with the oil path T after being connected with the one-way valve 3.3 in series, and an oil outlet A of the electromagnetic valve 7.2 is closed.
In a normal state, an oil inlet P of the electromagnetic valve 7.1 is communicated with an outlet B, and an oil return port T of the electromagnetic valve 7.1 is communicated with an outlet A; an oil inlet P of the electromagnetic valve 7.2 is communicated with an oil inlet B, and an oil outlet A of the electromagnetic valve 7.2 is communicated with an oil return port T. And the hydraulic oil supplies oil to the butterfly valve actuator 8 through the electromagnetic valve 7.1, and the butterfly valve actuator 8 directly returns oil to the oil path T through the two-way valve 9, so that circulation is formed.
In an emergency situation (the electromagnetic valve 7.1 cannot work normally, the pressure of an oil inlet P of the electromagnetic valve 7.1 is abnormal, and the like), a butterfly valve actuator (8 is required to be closed quickly, at the moment, the electromagnetic valve 7.2 is powered off, the pressure of the upper cavity of the two-way valve 9 is communicated with the oil channel T and is depressurized, the two-way valve 9 is opened, the pressure of an oil cavity on the right side of a piston of the butterfly valve actuator 8 is released quickly, and the piston of the butterfly valve actuator 8 moves right.
Problems with the technique of fig. 1: only one electromagnetic valve 7.2 is used for safety oil interruption quick closing, the reliability is not high, and the safety operation of the steam extraction butterfly valve can be influenced by the jamming, the faults, the refusal to move, the misoperation and the like of the electromagnetic valve.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide a safety shut-off device for a butterfly valve actuator, which is connected in parallel through a plurality of solenoid valves to improve the stability of the whole actuator.
In order to achieve the purpose, the utility model provides a safety shutoff device for a butterfly valve actuating mechanism, which comprises one or two groups of a first electromagnetic valve, a third electromagnetic valve, a second electromagnetic valve and a fourth electromagnetic valve, wherein an oil port A of the first electromagnetic valve is communicated with an oil port P of the second electromagnetic valve through a series pipe, and the oil port A of the second electromagnetic valve is communicated with a return pipe;
an oil port A of the third electromagnetic valve is communicated with an oil port P of the fourth electromagnetic valve through another series pipe, and an oil port A of the fourth electromagnetic valve is communicated with a return pipe;
oil ports A of the second electromagnetic valve and the fourth electromagnetic valve are communicated with a fourth pressure relief pipe, and the fourth pressure relief pipe is communicated with an oil way oil return port T;
the oil ports P of the first electromagnetic valve and the third electromagnetic valve are respectively communicated with a second pressure relief pipe, and the second pressure relief pipe is communicated with a first pressure gauge through a pressure measuring pipe.
Preferably, the two serial pipes are communicated with each other through a parallel pipe, the parallel pipe is communicated with an inlet of a pressure measuring joint, and the pressure measuring joint is connected with a second pressure gauge.
Preferably, the control ends of the first solenoid valve and the third solenoid valve, the second solenoid valve and the fourth solenoid valve, the first pressure gauge and the second pressure gauge are respectively in communication connection with the controller.
Preferably, the pressure measuring pipe is connected with a third stop valve in series, and the third stop valve is in an open state in a normal state.
The utility model also discloses a butterfly valve actuating mechanism, it is used for controlling the quick closing of butterfly valve executor, and uses there is above-mentioned butterfly valve actuating mechanism safety interruption device.
Preferably, the fuel injection valve further comprises a servo valve, a butterfly valve actuator and a two-way valve, wherein an oil port A of the servo valve is connected with the first stop valve in series and then communicated with an oil inlet interface A of a third oil inlet pipe, and the third oil inlet pipe is used for supplying oil to the butterfly valve actuator;
an oil port P of the servo valve is communicated through a first oil inlet pipe, and the first oil inlet pipe is connected with a throttling hole through a second oil inlet pipe in series and then is respectively communicated with oil ports P of a first electromagnetic valve and a third electromagnetic valve; an oil port T of the servo valve is communicated with one end of a fourth pressure relief pipe through a return pipe;
and a first outlet of the two-way valve is communicated with an oil way oil return port T through a first pressure relief pipe, a second outlet of the two-way valve is communicated with one end of a second pressure relief pipe, and the second pressure relief pipe is communicated with oil ports P of the first electromagnetic valve and the third electromagnetic valve respectively after being connected with a fourth stop valve in series.
Preferably, an oil port P of the servo valve is communicated with an outlet of the filter through a first oil inlet pipe, and an inlet of the filter is communicated with the oil path inlet P after being connected with the second stop valve in series.
Preferably, the part of the second pressure relief pipe between the fourth stop valve and the port X is communicated with one end of a third pressure relief pipe, the third pressure relief pipe is connected with a third stop valve in series, the other end of the third pressure relief pipe is communicated with the part of the fourth pressure relief pipe between the fifth stop valve and the port T, and in a normal state, the third stop valve is closed, and the fourth stop valve and the fifth stop valve are communicated.
Preferably, the control ends of the servo valve and the two-way valve are respectively in communication connection with the signal end of the controller, so that the servo valve and the two-way valve can be controlled to be switched and switched on and off through the controller.
Preferably, the controller is one of P L C, MCU and CPU, and is used for receiving, transmitting and analyzing control instructions and simultaneously performing parameter calculation;
after the first pressure gauge detects that the pressure exceeds the standard, the controller opens at least one of the first electromagnetic valve and the third electromagnetic valve, and the pressure enters the parallel pipe;
if the detected pressure of the second pressure gauge does not exceed the threshold value, the second electromagnetic valve and the fourth electromagnetic valve are not opened; and once the second pressure gauge is found to exceed the threshold value, at least one of the second solenoid valve and the fourth solenoid valve is opened, so that the second pressure relief pipe and the fourth pressure relief pipe form a loop.
The utility model has the advantages that: the utility model discloses.
1. The utility model discloses a design of a plurality of series-parallel solenoid valves, arbitrary solenoid valve maloperation, refusal move the normal action that can not influence the safety interruption function, greatly improved the reliability of system like this.
2. The utility model discloses under the extreme fault situation (four series-parallel solenoid valve trouble simultaneously), can open X, parallelly connected stop valve between the T mouth, the valve is turn-offed to the manual work.
3. The utility model is suitable for an emergency trip system of steam extraction butterfly valve actuating mechanism, or other similar valve actuating mechanism need the high security emergency trip to control the occasion of function, and its stability is high, simple structure, cost can not have great rising.
Drawings
Fig. 1 is a schematic view of a prior art structure.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a symbol diagram of a servo valve.
Fig. 4 is a servo valve symbol diagram of the solenoid valve.
In fig. 2: 210 butterfly valve actuator, 220 servo valve, 231 and 234 first to fourth solenoid valves (collectively referred to as solenoid valves), 241 and 245 first to fifth stop valves, 310 orifice, 320 filter, 250 two-way valve (unidirectional conduction), 410 first pressure gauge, 420 pressure tap.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
referring to fig. 2, a butterfly valve actuator for controlling quick closing of a butterfly valve actuator includes a servo valve 220, a first solenoid valve 231, a second solenoid valve 232, a third solenoid valve 233, and a fourth solenoid valve 234, an oil port a of the servo valve 220 is connected in series with a first stop valve 241 and then communicated with an oil inlet interface a of a third oil inlet pipe 113, and the third oil inlet pipe 113 is used for supplying oil to the butterfly valve actuator;
the first solenoid valve 231, the second solenoid valve 232, the third solenoid valve 233, and the fourth solenoid valve 234 are the same solenoid valves.
An oil port P of the servo valve 220 is communicated with an outlet of the filter 320 through the first oil inlet pipe 111, an inlet of the filter 320 is communicated with the oil path inlet P after being connected with the second stop valve 242 in series, and when the butterfly valve actuator 210 is used, hydraulic oil for driving the butterfly valve actuator 210 is input from the oil path inlet P;
the first oil inlet pipe 111 is connected in series with the throttle hole 310 through the second oil inlet pipe 112 and then is respectively communicated with the oil ports P of the first solenoid valve 231 and the third solenoid valve 233;
an oil port T of the servo valve 220 is communicated with one end of a fourth pressure relief pipe 124 through a return pipe 131, the fourth pressure relief pipe 124 is communicated with an oil return port T, and the fourth pressure relief pipe 124 is communicated with oil ports a of a second electromagnetic valve 233 and a fourth electromagnetic valve 234. When the butterfly valve actuator 210 is used, hydraulic oil output by the butterfly valve actuator 210 is output through the oil return port T. Preferably, the fourth pressure relief pipe 124 is connected in series with the fifth stop valve 245 and then communicated with the oil ports a of the second solenoid valve 233 and the fourth solenoid valve 234.
The servo valve 220 is switched and opened and closed by adopting electromagnetic control, the two-way valve 250 can only be conducted in one direction, and the flow direction of the two-way valve 250 is from the butterfly valve actuator 210; a first outlet of the two-way valve 250 is communicated with the oil return port T through a first pressure relief pipe 121. During normal use, the hydraulic oil that butterfly valve executor 210 decompressed all flows back to oil circuit oil return opening T through two-way valve 250, first pressure release pipe 121 to circulate with external equipment, like the booster pump.
A second outlet of the two-way valve 250 is communicated with one end of a second pressure relief pipe 122, the second pressure relief pipe 122 is communicated with oil ports P of the first electromagnetic valve 231 and the third electromagnetic valve 233 after being connected in series with the fourth stop valve 244, the second pressure relief pipe 122 is also communicated with one end of the pressure measuring pipe 142, the pressure measuring pipe 142 is communicated with a pressure measuring inlet of the first pressure gauge 410 after being connected in series with the third stop valve 243, and a signal end of the first pressure gauge 410 is communicated with a signal end of a controller; the second outlet of the two-way valve 250 is controlled to be opened and closed by the controller, and is closed in a normal state and opened when rapid pressure relief is needed.
The controller of the embodiment adopts one of P L C, MCU and CPU, and is mainly used for receiving, transmitting and analyzing control instructions and simultaneously carrying out parameter calculation.
The oil port A of the first solenoid valve 231 is communicated with the oil port P of the second solenoid valve 232 through a series pipe 141, and the oil port A of the second solenoid valve 232 is communicated with the return pipe 131;
the oil port a of the third solenoid valve 233 is communicated with the oil port P of the fourth solenoid valve 234 through another series pipe 141, and the oil port a of the fourth solenoid valve 234 is communicated with the return pipe 131;
the two serial pipes 141 are communicated with each other through a parallel pipe 132, and the parallel pipe 132 is communicated with an inlet of the pressure measuring joint 420. In actual use, another first pressure gauge may be installed at the outlet of the pressure measuring joint 420.
The part of the second pressure relief pipe 122 between the fourth stop valve 244 and the X port 611 is communicated with one end of the third pressure relief pipe 123, the third stop valve 243 is connected in series on the third pressure relief pipe 123, and the other end of the third pressure relief pipe 123 is communicated with the part of the fourth pressure relief pipe 124 between the fifth stop valve 245 and the T port 612.
In this embodiment, the return pipe 131 and the fourth pressure relief pipe 124 are the same pipe, and the second oil inlet pipe 112 and the second pressure relief pipe are the same pipe.
The control ends of the servo valve 220, the first electromagnetic valve 231, the second electromagnetic valve 232, the third electromagnetic valve 233 and the fourth electromagnetic valve 234 are respectively in communication connection with the signal end of the controller, so that the servo valve 220, the first electromagnetic valve 231, the second electromagnetic valve 232, the third electromagnetic valve 233 and the fourth electromagnetic valve 234 can be controlled to be switched and switched on and off through the controller.
In the initial state, the first stop valve 241, the second stop valve 242, the fourth stop valve 244, and the fifth stop valve 245 are all in the open state, and the third stop valve 243 is in the closed state. The hydraulic oil entering the oil path inlet P enters the second pressure relief pipe through the second oil inlet pipe 112, but the oil in the second pressure relief pipe cannot enter the first outlet of the butterfly valve actuator or the two-way valve, i.e., in a one-way closed state, and the first pressure gauge detects the pressure at the oil path inlet P.
During the use, first manometer 410 detects the pressure of second pressure release pipe 122 and conveys to the controller and compares with the predetermined threshold value, in case find pressure exceed predetermined threshold value, that is that oil circuit import P pressure is unusual, at this moment, needs butterfly valve executor 210 to close fast, that is to turn right the removal.
At this time, the controller controls at least one oil port P of the first electromagnetic valve and the third electromagnetic valve to be communicated with the oil port a, at least one oil port P of the second electromagnetic valve and the fourth electromagnetic valve to be communicated with the oil port a, namely, the second pressure relief pipe 122 is communicated with the fourth pressure relief pipe 124; the two-way valve 250 is opened, the pressure in the right oil chamber of the piston of the butterfly valve actuator 210 is rapidly released through the first and second pressure release pipes 121 and 122, and the piston of the butterfly valve actuator 210 is moved rightward and closed.
Of course, when the pressure of the oil inlet P is too high, the controller controls the servo valve 220 to communicate the oil port P of the servo valve with the oil port B, thereby discharging a part of the pressure from the return pipe 131. And the servo valve 220 may control the communication section of the ports P and B, thereby controlling the pressure relief amount. The servo valve of this embodiment chooses for use two potential control, mainly judges the size of hydraulic fluid port P and hydraulic fluid port B's intercommunication cross-section with the coil position of both sides respectively through detecting the iron core that drives hydraulic fluid port P and hydraulic fluid port B switching. This is partly prior art and the servo valve of this embodiment is also purchased directly.
In this embodiment, a second pressure gauge (of the same type as the first pressure gauge 410) is connected to the pressure tap 420, and the second pressure gauge transmits a pressure signal to the controller. In actual use, after the first pressure gauge 410 detects that the pressure exceeds the standard, the controller opens at least one of the first solenoid valve and the third solenoid valve, the pressure enters the parallel pipe 132, and the second pressure gauge does not open the second solenoid valve and the fourth solenoid valve if the detected pressure does not exceed the threshold. Once the second pressure gauge is found to exceed the threshold value, at least one of the second solenoid valve and the fourth solenoid valve is opened, so that the second pressure relief pipe 122 and the fourth pressure relief pipe 124 form a loop, and rapid pressure relief is performed.
The electromagnetic valve can be prevented from being mistakenly operated and refused to be operated through the structural design of connecting the four electromagnetic valves in series and in parallel, so that the safety of the emergency interruption function is improved. For example, even if one group of the first solenoid valve, the third solenoid valve, the fourth solenoid valve and the second solenoid valve is opened by mistake, the other group is not opened along with the first solenoid valve and the third solenoid valve, so that the condition of misoperation can be counteracted. When one of the first electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the second electromagnetic valve needs to be opened, if one of the first electromagnetic valve and the third electromagnetic valve is refused, the other electromagnetic valve still can be opened, and if the other electromagnetic valve is refused, the other electromagnetic valve still can be opened, a loop can be formed between the second pressure relief pipe and the fourth pressure relief pipe, so that the pressure can be quickly relieved, and the stability and the effectiveness of the pressure relief pipe on the pressure relief are guaranteed.
In addition, when the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve need to be maintained, the whole system does not need to be closed, the fourth stop valve 244 and the fifth stop valve 245 are closed, and the third stop valve 243 is opened, so that the X port 611 and the T port 612 are directly communicated through the third pressure relief pipe 123, normal operation of the system is guaranteed, maintenance of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve is not influenced, and online operation is achieved.
The details of the present invention are well known to those skilled in the art.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A safety interruption device of a butterfly valve actuating mechanism is characterized by comprising one or two groups of a first electromagnetic valve, a third electromagnetic valve, a second electromagnetic valve and a fourth electromagnetic valve, wherein an oil port A of the first electromagnetic valve is communicated with an oil port P of the second electromagnetic valve through a series pipe, and the oil port A of the second electromagnetic valve is communicated with a return pipe;
an oil port A of the third electromagnetic valve is communicated with an oil port P of the fourth electromagnetic valve through another series pipe, and an oil port A of the fourth electromagnetic valve is communicated with a return pipe;
oil ports A of the second electromagnetic valve and the fourth electromagnetic valve are communicated with a fourth pressure relief pipe, and the fourth pressure relief pipe is communicated with an oil way oil return port T;
the oil ports P of the first electromagnetic valve and the third electromagnetic valve are respectively communicated with a second pressure relief pipe, and the second pressure relief pipe is communicated with a first pressure gauge through a pressure measuring pipe.
2. The butterfly valve actuator safety interrupter device of claim 1 wherein two of the series pipes are in communication with each other via a parallel pipe, the parallel pipe being in communication with an inlet of a pressure tap, the pressure tap being connected to a second pressure gauge.
3. The butterfly valve actuator safety interrupter device of claim 1, wherein the control terminals of the first and third solenoids, the second and fourth solenoids, the first pressure gauge, and the second pressure gauge are each communicatively coupled to the controller.
4. The safety shut-off device of a butterfly valve actuator according to claim 1, wherein a third shut-off valve is connected in series to the pressure measuring pipe, and the third shut-off valve is opened in a normal state.
5. A butterfly valve actuator for controlling the rapid closing of a butterfly valve actuator, characterized in that a safety shut-off device according to any of claims 1-4 is applied.
6. The butterfly valve actuator of claim 5, further comprising a servo valve, a butterfly valve actuator, and a two-way valve, wherein an oil port A of the servo valve is connected in series with the first stop valve and then communicated with an oil inlet interface A of a third oil inlet pipe, and the third oil inlet pipe is used for supplying oil to the butterfly valve actuator;
an oil port P of the servo valve is communicated through a first oil inlet pipe, and the first oil inlet pipe is connected with a throttling hole through a second oil inlet pipe in series and then is respectively communicated with oil ports P of a first electromagnetic valve and a third electromagnetic valve; an oil port T of the servo valve is communicated with one end of a fourth pressure relief pipe through a return pipe;
and a first outlet of the two-way valve is communicated with an oil way oil return port T through a first pressure relief pipe, a second outlet of the two-way valve is communicated with one end of a second pressure relief pipe, and the second pressure relief pipe is communicated with oil ports P of the first electromagnetic valve and the third electromagnetic valve respectively after being connected with a fourth stop valve in series.
7. The butterfly valve actuator according to claim 6, wherein the oil port P of the servo valve is connected to an outlet of a filter through a first oil inlet pipe, and an inlet of the filter is connected to the oil inlet P after being connected in series with the second cut-off valve.
8. The butterfly valve actuator according to claim 7, wherein a portion of the second pressure relief pipe between the fourth stop valve and the X port communicates with one end of a third pressure relief pipe, a third stop valve is connected in series to the third pressure relief pipe, and the other end of the third pressure relief pipe communicates with a portion of the fourth pressure relief pipe between the fifth stop valve and the T port, and in a normal state, the third stop valve is closed, and the fourth stop valve and the fifth stop valve communicate with each other.
9. The butterfly valve actuator of claim 6, wherein the control ends of the servo valve and the two-way valve are respectively in communication connection with a signal end of the controller, so that the servo valve and the two-way valve can be switched and switched on and off by the controller.
10. The butterfly valve actuator of claim 9, wherein the controller is one of a P L C, an MCU, and a CPU, and is configured to receive, transmit, analyze, and perform parameter calculation;
after the first pressure gauge detects that the pressure exceeds the standard, the controller opens at least one of the first electromagnetic valve and the third electromagnetic valve, and the pressure enters the parallel pipe;
if the detected pressure of the second pressure gauge does not exceed the threshold value, the second electromagnetic valve and the fourth electromagnetic valve are not opened; and once the second pressure gauge is found to exceed the threshold value, at least one of the second solenoid valve and the fourth solenoid valve is opened, so that the second pressure relief pipe and the fourth pressure relief pipe form a loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922197826.2U CN211059452U (en) | 2019-12-10 | 2019-12-10 | Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922197826.2U CN211059452U (en) | 2019-12-10 | 2019-12-10 | Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof |
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| CN211059452U true CN211059452U (en) | 2020-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922197826.2U Active CN211059452U (en) | 2019-12-10 | 2019-12-10 | Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
-
2019
- 2019-12-10 CN CN201922197826.2U patent/CN211059452U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
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