CN1171838A - Valve driving device - Google Patents
Valve driving device Download PDFInfo
- Publication number
- CN1171838A CN1171838A CN 95197194 CN95197194A CN1171838A CN 1171838 A CN1171838 A CN 1171838A CN 95197194 CN95197194 CN 95197194 CN 95197194 A CN95197194 A CN 95197194A CN 1171838 A CN1171838 A CN 1171838A
- Authority
- CN
- China
- Prior art keywords
- gas
- valve
- pressure
- pressurized machine
- mentioned
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The present invention relates to a valve driving device for operating a shut-off valve or a discharge valve provided on a pipe line for gas or liquid in which a gas/oil type booster and hydraulic pump are provided between a gas piping branched from a primary side of said gas pipe line and a cylinderof an actuator, and in which said booster and said hydraulic pump are connected to each other via piping so that said actuator is driven by virtue of hydraulic pressure increased by means of said booster with a pressure on the primary side of said gas pipe line used as a power source to thereby close said shut-off valve or open said discharge valve, while restoring said booster so that gas inside said booster to return to said gas pipe line.
Description
A kind of be used for the driving shutoff valve that provides in the pipeline of carrying gaseous state or liquid or the valve actuator of cut-off valve are provided.
Such as in gas pipe line, pipeline shutoff valve all is housed on a plurality of positions on road along the line.Utilize actuator to drive shutoff valve, and this actuator be with the gas pressure that extracts near the pipeline the shutoff valve position as power, this driving mode is well known.Yet in this case, device proper is very unsafe, because from will being placed into the atmosphere with gas that actuator radiates, the coal gas of discharging into the atmosphere like this may work the mischief to people and animals, and ducted gas pressure can not use as power.Therefore usually additionally provide the cylinder of independent air, nitrogen or a carbon dioxide in the reality, with the power source of this cylinder as actuator.
When using above-mentioned this pressure cylinder, the pressure of cylinder is driving shutoff valve greater than the gas pressure in the gas pipe line, so the pressure height that it must be more required than actuator.Because the finite capacity of cylinder, shutoff valve may be owing to underpressure stops action in handoff procedure.Therefore cylinder needs bigger ability and replenishes self capacity or carry out self displacement, to satisfy new demand.If above-mentioned cylinder replenish or displacement not exclusively, then may cause pressure cylinder under the situation of needs, to drive shutoff valve, and therefore break down, perhaps even the operation that jeopardizes gas pipe line.
One of purpose of the present invention provides a kind of valve actuator, it can be safely with the gas pressure of gas piping power as actuator, come shutoff valve or cut-off valve in the pilot line, and the danger that does not have gases used pressure to leak into atmosphere, people and animals are worked the mischief, and eliminated fully must be with the dependence of air, nitrogen or carbon dioxide cylinder as power source.
Aforesaid to use in the situation of gas in the pipeline as the drive unit of the power source of actuator, include the gas line of a sealing, so that gas turns back in the pipeline, if the pressure of pipeline reduces, then shutoff valve may normal running.
The gas tank of a pressurized gas that is full of non-combustible gas and a pressurized machine of placing separately are provided is not hard to imagine to drive unit for this reason.If the two is to be connected with each other by a pipe for gas tank and pressurized machine, device may underproof operation occur owing to the leakage of tie point so.And because pressurized machine and gas tank all are independent entities, the space that they are installed is very big, so that increased a lot of troubles for the compactedness of drive unit itself.
Another object of the present invention provides a kind of valve actuator, and it reasonably improves the compactedness of device by pressurized machine being placed the mode of gas tank inside.This valve actuator is in the operating process of pressurized machine, when the gas pressure in the gas tank is lower than prescribed level, fluid is filled gas tank automatically by pipeline, make the interior gas pressure of gas tank be held constant at the level of regulation, thereby eliminated fully additional gas tank or the displacement cylinder necessity, the problem that several leakage points only occurred, and in safety with all have superiority greatly economically.
For achieving the above object, the invention provides the shutoff valve in a kind of propellant pipeline or the valve actuator of cut-off valve, its characteristic is, between gas tube that comes out from the basic end branch of gas piping and actuator cylinder, a gas/oil type pressurized machine and an oil hydraulic pump are set, and they are coupled together with a pipe, pressurized machine with the pressure of the basic end of gas piping as power source, fluid pressure is increased, drive actuator whereby, and then close shutoff valve or open cut-off valve, simultaneously, place the oil hydraulic pump between pressurized machine and the actuator to reset pressurized machine, so that the gas in the pressurized machine turns back in the gas piping through above-mentioned gas tube.
In this case, fuel tank is connected with oil hydraulic pump, and a stroke of the above-mentioned pressurized machine oil mass of discharging should be no less than two oil masses that stroke is discharged of above-mentioned cylinder.
Another aspect of the present invention is about opening or closing the shutoff valve in the gas piping or the valve actuator of cut-off valve, its structure be with the gas tube that comes out from the basic end branch of gas piping gentle/air chamber of oil type pressurized machine couples together by the intermediary of a reduction valve, reduction valve gentle/check valve is set between the oil type pressurized machine, the gas tube that will communicate with air chamber is by intermediary's check valve simultaneously, be connected with the other end of above-mentioned gas pipeline, the gas pressure relation between gas tube and the pressurized machine that makes satisfies representation: the pressure in the air chamber of the pressure＞pressurized machine of the other end of the pressure＞gas piping of the basic end of gas piping, between the cylinder of the grease chamber of above-mentioned pressurized machine and actuator, be provided with an oil pipe, pressurized machine with gas pressure as power source, gas pressure acts on the air chamber of pressurized machine, fluid pressure in the oil pipe is raise, fluid pressure after pressure raises makes actuator action, close or open shutoff valve or cut-off valve, and make the oil hydraulic pump that places in the oil pipe reset pressurized machine with higher fluid pressure, make the interior gas of pressurized machine be fed to the other end of gas piping 1 through above-mentioned gas tube.
In the case, gas also can enter another pipeline that stream has same gas, and does not enter the other end of above-mentioned gas pipeline 1.
The invention still further relates to a kind of valve actuator, its structure is included in the gas piping that contains shutoff valve or cut-off valve, be provided with a cylinder type actuator, with adopting when the pressure of the other end of pipeline is lower than the pressure of basic end, open or close shutoff valve or cut-off valve, and the oil pipe that will be positioned at the two ends of actuator cylinders is connected with the grease chamber of gas/oil type pressurized machine respectively, the air chamber that makes a pressurized machine joins with the gas tube that comes out from the other end branch of gas piping, and the air chamber of another pressurized machine joins with the gas tube that comes out from the basic end branch of gas piping.
In this case, between an end of above-mentioned cylinder or the other end and pressurized machine oil pipe is set, so that connect with fuel tank selectively, and then the oil in the fuel tank can turn back in cylinder or the pressurized machine via the effect of oil hydraulic pump.
Another aspect of the present invention relates to a kind of driving and is arranged in the shutoff valve of pipeline of conveyance fluid or the valve actuator of cut-off valve, its structure is for being provided with a pressurized machine a gas tank inside, link to each other with a valve driving actuator, make whereby between gas tank and the pressurized machine and be connected in inside, simultaneously, by a supplying pipe, intermediary by the normal pressure supplier, gas tank and pipeline are coupled together, thereby make the pressure-driven valve drive actuator after the pressure with above-mentioned gas tank is the pressurized machine pressurization of power source, and then drive shutoff valve or cut-off valve.
In this case, be connected with the entry end of check valve by the other end a backpressure valve, basic end with above-mentioned backpressure valve links to each other with the outlet end of check valve simultaneously, form the normal pressure supplier, be connected with the supplying pipe of pipeline one end by the other end backpressure valve, the mode that the basic end of backpressure valve is linked to each other with the supplying pipe of gas tank one end simultaneously, the fluid of filling gas tank with authorized pressure can be an air, nitrogen, a kind of in carbon dioxide or the inert gas, it can mix with the fluid in the pipeline, and any problem can not appear, when the gas pressure in the gas tank is lower than prescribed level, the fluid of above-mentioned pipeline of flowing through will be filled gas tank, so just can make the gas pressure of gas tank remain on constant level.
As mentioned above, because valve actuator of the present invention utilizes the gas pressure of gas piping as power source, drive shutoff valve or cut-off valve, it neither needs the such power source of pressure cylinder, do not need additional or the required power of displacement cylinder, therefore owing to the possibility that the preparation deficiency causes device to go wrong or problem increases the weight of of replenishing or replacing has not existed yet.And, because device, can not work the mischief to environment so it neither can waste gas not with the gases used atmosphere of putting into yet, can use safely.Employed a kind of Y branching type pipeline enough is used for extracting gases from pipeline in this device, and gas is returned in the pipeline, and equipment such as pipeline are oversimplified.
Further, owing to supply with actuator as the pressure of power source by pressurized machine, and the selection of pressurized machine and actuator can be optimized, the therefore valve actuator compact structure that is provided, reasonable price.When gas pressure does not exist or power supply when stopping, oil hydraulic pump that resetting pressurized machine can be used as power source, makes gas turn back to gas piping.This pump can manually-operable, also can move automatically.
Because valve actuator pressurized machine of the present invention is arranged in the gas tank, so device proper can be made compactness.And gas tank needs to carry out gas make-up or cylinder displacement anything but, because it can provide pipeline gas with authorized pressure by the intermediary of normal pressure supplier.Gas in the gas tank may leak in the atmosphere in no instance, does not therefore pollute the environment.In sum, the present invention can provide a kind of Maintenance free and at the valve actuator that has great advantage aspect Security, Economy and the reliability.
Fig. 1 is first embodiment's of valve actuator of the present invention pipe-line system figure, Fig. 2 is the part pipe-line system figure of device shown in Fig. 1 under the valve closing state, Fig. 3 is the contrast figure of the output torque of valve actuator, Fig. 4 is the aid illustration figure of the output torque of an actuator, Fig. 5 is second embodiment's of valve actuator of the present invention pipe-line system figure, Fig. 6 is the 3rd embodiment's of valve actuator of the present invention pipe-line system figure, Fig. 7 is the 4th embodiment's of valve actuator of the present invention pipe-line system figure, Fig. 8 is the part pipe-line system figure of an example of the air supply method of the normal pressure supplier among Fig. 7, Fig. 9 is the part pipe-line system figure of underground transition status under the shutoff valve closed condition, Figure 10 is the cross sectional view of an example under the situation of pressurized machine configuration in gas tank, and Figure 11 is the comparison diagram of air box pressure and actuator output torque.
Fig. 1 is first embodiment's of valve actuator of the present invention pipe-line system figure.
The direction conveying gas that gas piping 1 is represented along arrow among the figure.Shutoff valve 2 is arranged in gas piping 1, and hydraulic cylinder type valve actuator 3 is connected with shutoff valve 2, is applicable to open or close shutoff valve 2.Opening or closing of shutoff valve 2 is that the fluid power of piston 3b in cylinder 3a by this actuator 3 moves and realizes.Figure 1 shows that the situation that shutoff valve 2 is shown in an open position.A gas/oil type pressurized machine 6 is between gas piping 4 and oil pipe 5, and wherein gas piping 4 is to come out from the basic end branch of gas piping 1, and oil pipe 5 links to each other with cylinder 3a.Actuator 3 produces action by means of the fluid pressures in the oil pipe 5, drives shutoff valve 2, and the hydraulic pressure in the oil pipe 5 utilize pressurized machine 6 to be able to adherence pressure, pressurized machine 6 with the pressure of the basic end of gas piping 1 as power source.
Can produce the situation of multiple (for example, two or three) motion for shutoff valve 2, pressurized machine 6 produces these necessary oil masses of moving with regard to having the ability.
Supercharging ratio about pressurized machine 6, valve is not got in touch with the pressure condition of circuit when normal operation, as long as for the variation of gas pressure scope that extracts as the circuit of power source, supercharging ratio by means of pressurized machine, be maintained at above valve necessary torque level in circuit variation of gas pressure scope, as shown in Figure 3 by suitably increasing the resulting moment of torsion of valve actuator (diameter of cylinder and the length of arm).
With reference to Fig. 4 this situation is described below.To use one must moment of torsion be that the spherical valve of 2200 kilogram-meters and the actuator of a piston type dog link system are example.By the pressurized machine supercharging, the output torque T of operation is calculated as follows the power source pressure of needs in service before entering actuator:
Efficient μ is set at 1.
T=π/4 * d
2* L * P * M * 2 (2 are limited to the dog link system)
＝π/4×9
2×10×70×2.58×2
=229,785 kilograms centimetres
=2,297 kilogram-meters＞2,200 kilogram-meters
When the power source pressure P be 70 kilogram forces/centimetre
2During gauge pressure, it is greater than essential moment of torsion, as shown in Figure 4.Be used for critical this actuator of closing and keep valve, and produce three kinds of actions in normally open, i.e. switch switch, even at power source between disconnected changing over.
Among Fig. 1,9 the expression be a spacing solenoid valve of switch, 10 the representative be one the conversion spacing solenoid valve. Solenoid valve 9 and 10 can select to use four way solenoid valve, also can use a pair of two-way electromagnetic valve.11 and 12 represent a speed control device respectively, and 13 represent a reduction valve, and 14 is check valves, and 15 represent a stop valve, 16 expressions be a flow control valve, 17 is pressure switches, 18 also is a check valve, and 19 and 20 represent a stop valve respectively, and 21 represent power source.Dotted line is represented the control circuit line.
Even the structure of the spacing solenoid valve 9 of above-mentioned switch preferably will guarantee also can keep the work of pressurized machine 6 under the situation that the spacing solenoid valve 10 of conversion leaks.Particularly adopt the position that to keep pressurized machine 6 for a long time when do not have leaking (good seal) formula structure when it.
The runnability of the foregoing description once will be described below.
As shown in Figure 1, oil pipe 5 is set between the two ends of pressurized machine 6 and cylinder 3a, and the spacing solenoid valve 9 of switch, the spacing solenoid valve 10 of conversion, oil hydraulic pump 7, speed controller 11 and 12, check valve 14 and reduction valve 13 are arranged on it.Spacing solenoid valve of switch 9 and the spacing solenoid valve 10 of conversion all are separately installed with manual joystick, and they drive and produce action by emergency signal or from the operation signal in control room.About emergency signal, special explanation will be carried out below.
Among Fig. 1, shutoff valve 2 remains on open mode, and the direction that allows normal state gas to represent along arrow flows in pipeline 1.
The gas piping 4 that branches out from the basic end of gas piping 1 applies gas pressure to the air chamber 6b of gas/oil type pressurized machine 6 exhausting air to it.The 6a of grease chamber of pressurized machine 6 links to each other with the valve open pressure end 3c of cylinder 3a by oil pipe 5, and pressurized machine 6 as power source, with the fluid pressure lifting, and is applied to the valve open pressure end 3c of piston 3b with gas pressure.The another side of cylinder 3a is that valve closing pressure end 3 links to each other with fuel tank 8 by the spacing solenoid valve 10 of conversion.Because the spacing solenoid valve 9 of switch is maintained in its closed position, shutoff valve 2 also just stays open state, defines the position of pressurized machine simultaneously.
If the downstream of gas piping 1 breaks down, a large amount of gases have been leaked, cause the pressure of the downstream of flow control valve 16 to reduce, perhaps the pressure of downstream raises for some reason, pressure switch 17 these faults of reflection, and send critical cut-out or disconnect the signal of shutoff valve 2, perhaps the signal that drives shutoff valve 2 is sent in the control room.In this case, change spacing solenoid valve 10 and change the qualification position, the spacing solenoid valve 9 of switch is opened simultaneously, and the valve open pressure end 3c of cylinder 3a and fuel tank 8 are connected, and makes the interior oil of valve open pressure end 3c of cylinder 3a be drained into fuel tank 8.Like this, the fluid pressure that pressurizes through pressurized machine 6 is applied on the valve closing pressure end 3e of cylinder 3a, promotes piston 3d to the right, as shown in Figure 1, closes shutoff valve 2.
In ensuing situation, oil hydraulic pump 7 moves, and the oil in the fuel tank 8 is opened check valve 14, and move forward into the 6a of grease chamber of pressurized machine 6, fluid pressure is greater than the gas pressure in the air chamber 6b of pressurized machine 6, and the gas in the air chamber 6b is back to pipeline 1, resets pressurized machine 6.
In addition, when shutoff valve 2 is opened from the operation signal in control room or manually-operable owing to response, change spacing solenoid valve 10 and change the qualification position, make the hydraulic pressure of automatic pressure intensifier 6 to be applied on the valve open pressure end 3c of cylinder 3a, and the spacing solenoid valve 9 of switch is opened, and makes oil be drained into fuel tank 8 in the valve closing pressure end 3e of cylinder 3a.Such result is that the hydraulic pressure of the above-mentioned 6a of grease chamber that comes automatic pressure intensifier 6 makes cylinder 3a action, opens shutoff valve 2.Open after the shutoff valve 2, though the spacing solenoid valve 9 of switch returns to position shown in Figure 1, the hydraulic pressure of pressurized machine 6 still continues to be applied on the valve open pressure end 3c of cylinder 3a, still keeps motionless state because change spacing solenoid valve 10.Close shutoff valve 2, need qualification position, and open the spacing solenoid valve 9 of switch simultaneously by the spacing solenoid valve 10 of change conversion.By using the manual rod of these two solenoid valves 9 and 10, can realize opening and closing shutoff valve 2 equally.
In the normal variation scope of the gas pressure of gas piping 1, need pressurized machine 6 to have a constant supercharging ratio, make excursion with respect to the control shutoff valve 2 necessary moments of torsion that cause by gas pressure change, enough be used for drive cylinder 3a, make shutoff valve 2 produce action.Stop valve 15,19 and 20 is used for operations such as maintenance, inspection, and reduction valve 13 guarantees that pipeline comprises the safety of oil pipe 5.This valve actuator in can be applicable to gas piping, also can be used in the pipeline of carrying liquid substance, with the supporting use of shutoff valve.
Above-mentioned first embodiment has described the situation that valve actuator is used to close shutoff valve, and it can also be used for the cut-off valve of propellant pipeline.In more detail, as shown in Figure 2, the structure of this valve actuator is that gas/oil type pressurized machine 6 and oil hydraulic pump 7 are placed between the cylinder 3a of the gas tube 4 that branches out from the basic end of gas piping 1 and actuator 3, and they are linked to each other with oil pipe 5, thereby pressurized machine 6 is a power source with the pressure of the basic end of gas piping, and hydraulic pressure is improved as shown in Figure 1,, drive actuator 3 whereby, open cut-off valve 2.Simultaneously oil hydraulic pump 7 is placed between pressurized machine 6 and the actuator 3, thereby utilize oil hydraulic pump 7 to reset pressurized machine 6, and make the gas in the pressurized machine 6 return gas piping by gas tube 4.The effect of cut-off valve has replaced the effect of the shutoff valve among aforementioned first embodiment in this example, and the structure of present embodiment, operation and function are all identical with first embodiment substantially.
Fig. 5 is second embodiment's of valve actuator of the present invention pipe-line system figure.Among this figure, all use identical reference number to represent with part identical among first embodiment of Fig. 1, and they are the same with appropriate section among first embodiment, represent same operation, serve the same role, therefore will omit description in the following description these parts.
As shown in Figure 5, oil pipe 5 is arranged between the cylinder 3a of the 6a of grease chamber of pressurized machine 6 and actuator 3, so that pressurized machine 6 increases the fluid pressures in the oil pipe 5 to be added in gas pressure on the air chamber 6b as power source, make actuator 3 produce action, and then open or close shutoff valve 2.
Be provided with oil hydraulic pump 7 in the oil pipe 5, and link to each other with fuel tank 8, being pressurized to the fluid pressure that is higher than the pressure in the oil pipe 5 through oil hydraulic pump 7 like this can promote oil in the hydraulic tube 5 forward and comprise oil in the fuel tank 8, make in its 6a of grease chamber that enters pressurized machine 6, and then reset pressurized machine 6, and by gas tube 24, make gas in the air chamber 6b of pressurized machine 6 push ahead the other end of pipeline 1.
Above-mentioned second embodiment's operating process will be described below.
Pressure dependence satisfies representation: the pressure of the air chamber 6b of the pressure＞pressurized machine 6 of pressure＞pipeline 1 the other end of pipeline 1 basic end, and the establishment of this representation is the position that is connected with pipeline 1 because of with respect to gas tube 4, flow control valve 16 is positioned at upstream extremity.
The air chamber 6b of pressurized machine 6 accepts the pressure of the gas tube 4 that comes out since the basic end branch of gas piping 1.The 6a of grease chamber of pressurized machine 6 joins by the valve open pressure end 3c of oil pipe 5 with cylinder 3a, and pressurized machine as power source, increases fluid pressure with gas pressure like this, and the hydraulic pressure after the increased pressure is applied on the valve open pressure end 3c of piston 3b.On the other hand, promptly the valve closing pressure end 3e of cylinder 3a joins with fuel tank by the spacing solenoid valve 10 of conversion, and shutoff valve 2 keeps its open mode, and the position that keeps pressurized machine 6 simultaneously is because the spacing solenoid valve 9 of switch remains on closed condition.
When the downstream of gas piping 1 breaks down, a large amount of gases have been leaked, when causing the pressure of the downstream of flow control valve 16 to reduce, when perhaps the pressure of downstream raises for a certain reason, pressure switch 17 these faults of reflection, and send critical cut-out or disconnect the signal of shutoff valve 2, perhaps the signal that drives shutoff valve 2 is sent in the control room.In this case, change spacing solenoid valve 10 transpositions, the spacing solenoid valve 9 of switch is opened simultaneously, and the valve open pressure end 3c of cylinder 3a and fuel tank 8 are connected, and makes the interior oil of valve open pressure end 3c of cylinder 3a be drained in the fuel tank 8.The result is like this, and the fluid pressure that pressurizes through pressurized machine 6 is applied on the valve closing pressure end 3e of cylinder 3a, promotes piston 3d to the right, as shown in Figure 5, closes shutoff valve 2.
Next, oil hydraulic pump 7 moves, oil in the fuel tank 8 is opened check valve 14, and move forward into the 6a of grease chamber of pressurized machine 6, when the fluid pressure that is produced greater than the gas pressure on the air chamber 6b that is added in pressurized machine 6, and during greater than the pressure of the other end of pipeline, gas can move forward into the other end of pipeline, and pressurized machine 6 is reset by the action that is arranged on the check valve 25 in the gas tube 24.
For illustrating in greater detail above-mentioned enforcement, the pressure of supposing the basic end of gas piping 1 is 70 kg/cm
2, the pressure of the other end of gas piping 1 is 40 kg/cm
2, the pressure that under the different pressures situation, produces the air chamber 6b of the required pressurized machine 6 of essential valve torque be 30 kilogram forces/centimetre
2Check valve 25 is housed on the circuit of the other end of gas piping 1.In service at pressurized machine 6, the reverse flow that flows to reduction valve is stoped by check valve 23, and pressurized machine is reset by oil hydraulic pump 7.When gas pressure during greater than the pressure of the other end of gas piping 1, gas flows to the other end of gas piping 1 by check valve 25.
Such result is that gas required in the running of pressurized machine both was not consumed, and was not placed in the atmosphere yet.
The waste gas of pressurized machine 6 also can be supplied to stream to be had in another root pipeline 26 of same gas, shown in dot and dash line among Fig. 5, and does not enter the other end of above-mentioned gas piping.
Fig. 6 is the 3rd embodiment's of valve actuator of the present invention pipe-line system figure.Among this figure, all use identical reference number to represent with part identical among first and second embodiment among Fig. 1 and Fig. 5, and they are the same with appropriate section among first embodiment, represent same operation, serve the same role, therefore will omit description in the following description these parts.
The 3rd embodiment's shown in Figure 6 operating process will be described below.
As the switching valve 28 present states of four way solenoid valve is the gas tube 4 that branches out of the basic end from gas piping 1 and the air chamber 6b of pressurized machine 6 connects, and the air chamber 6b of pressurized machine 6 itself links to each other with the valve open pressure end 3c of cylinder 3a, and the air chamber 27b of the pressurized machine 27 that links to each other with the valve closing pressure end 3e of cylinder 3a connects with the gas tube 25 that the other end from gas piping 1 branches out again.The shutoff valve 2 that is arranged in pipeline 1 is open modes.Owing to be located immediately at the effect of the control valve 16 after the shutoff valve 2, the pressure of the other end of pipeline 1 (for example, 3～40 kilogram forces/centimetre
2), even be positioned under the open mode at shutoff valve 2, also than the pressure of the basic end of pipeline 1 (for example, 20～70 kilogram forces/centimetre
2) low.
Next, the air chamber 27b that switching valve 28 transforms to the gas tube 4 that makes to come out from the basic end branch of pipeline 1 and pressurized machine 27 joins, and the air chamber 27b of pressurized machine 27 is connected with the valve closing pressure end 3e of cylinder 3a; The conversion of switching valve 28 makes the air chamber 6b of pressurized machine 6 and the gas tube 25 that comes out from the other end branch of pipeline 1 join simultaneously, and the air chamber 6b of pressurized machine 6 is connected with the valve open pressure end 3c of cylinder 3a, gas pressure by the basic end of pipeline 1 makes the fluid pressure of its supercharging promote the piston 3d of cylinder 3a towards the direction of valve closing pressure end 3e, the oil of the valve open pressure end 3e side of cylinder 3a is advanced into pressurized machine 6, the other end of pipeline 1 is gone in gas propulsive in the air chamber 6b of pressurized machine 6, thereby close shutoff valve 2.
In the case, the pressurized machine 6 that is connected on the valve open pressure end 3c also will be applied on the valve open pressure end 3c fluid pressure of its supercharging by the pressure of the other end of pipeline 1.For reaching the aforesaid cylinder 3a action that makes, thereby open the purpose of shutoff valve 2, must to can being produced, cylinder 3a open shutoff valve 2 necessary operations power greatly enough greatly by the difference that the gas pressure of the gas pressure of the basic end of gas piping 1 and the other end acts on respectively between the fluid pressure that is produced on pressurized machine 6 and the pressurized machine 27.When the pressure of holding substantially when the pressure ratio of the other end of pipeline 1 is low, just possessed this condition.
Further, provide independent pressurized machine 6 and pressurized machine 27 respectively, so pressurized machine 6 and pressurized machine 27 can allow the optimum state ability separately because the structure of actuator 3 in the present embodiment is pressure tube 5a and 5b for the two ends that are positioned at cylinder 3a.
Fig. 7 is the pipe-line system figure with the 4th embodiment of the valve actuator that is applied to the shutoff valve in the pipeline of the present invention.Among this figure, with identical part among first to the 3rd embodiment's the related system figure, all represent with identical reference number, and they are the same with appropriate section among first embodiment, represent same operation, serve the same role, therefore will omit description in the following description these parts.
The actuator 3 that mentions is above driven by the fluid pressure that gas pressure produced that promotes gas tank 32 by pressurized machine 6, and actuator 3 couples together by oil pipe 5 with pressurized machine 6.In this case, be sealed with inert gas such as nitrogen or air in the gas tank 32.Be provided with gas/oil type pressurized machine 6 in gas tank 32 inside,, also will illustrate in greater detail below for pressurized machine 6.
The valve open pressure end 3c of cylinder 3a links to each other with oil pipe 5d with oil pipe 5c respectively with valve closing pressure end 3e, receives respectively on the fuel tank 8.The oil pipe 5e that is connected with fuel tank 8 is provided with oil hydraulic pump 34, and oil hydraulic pump 34 is according to the testing signal of the displacement that obtains pressurized machine 6 from sensor 33 theres and action voluntarily.
Pressure is pressurized to the stress level that is higher than in the oil pipe 5c through oil hydraulic pump 34, by means of this pressure, oil in the oil pipe 5 comprises that the oil in the fuel tank 8 moves forward among the 6a of grease chamber of pressurized machine 6, cause pressurized machine 6 to be reset, and the oil mass in the 6a of grease chamber of pressurized machine 6 also will be replenished automatically.The replenishing also can manual switching valve 35 be set by the neutral position at oil pipe 5c and hand pump 7 is set on oil pipe 5e of oil in the 6a of grease chamber of pressurized machine 6 realized.
In this embodiment, gas tank 32 and pipeline 1 couple together by a supplying pipe 101, and are provided with normal pressure supplier 100 in the intermediate portion of this supplying pipe 101.Normal pressure supplier 100 is to be combined by a backpressure valve 103 and check valve 104 parallel connections.In more detail, when device constituted, the entry end of the other end of backpressure valve 103 and check valve 104 linked together, and simultaneously, the basic end of backpressure valve 103 and the outlet end of check valve 104 link together.The other end of backpressure valve 103 links to each other with the supplying pipe 101 of pipeline 1 one ends, and the basic end of backpressure valve 103 links to each other with the supplying pipe 101 of gas tank 32 1 ends.The supplying pipe 101 of pipeline 1 one ends is provided with stop valve 102.
Suppose in this situation that backpressure valve 103 and check valve 104 move under the gas pressure of stipulating separately that can be set to any size.Should be noted that the normal pressure supplier 100 that the front is mentioned in describing only is an example, do not constitute any restriction to its concrete structure, therefore, this device can be other structure arbitrarily guaranteeing to produce under the situation of the motion identical with said structure.Can not link to each other with the supplying pipe 101 that normal pressure supplier 100 provides in the lump with pipeline 1, and with Fig. 7 in the pipeline 1 ' be connected represented with dot and dash line.
By the way, the efficient of finishing that gas is filled gas tank 32 improves along with the increase of stuffing pressure, therefore, preferably links to each other with the part of the pipeline 1 with elevated pressures with the supplying pipe 101 that gas tank 32 joins.In the present embodiment, can provide a secondary circuit as shown in Figure 8 in addition.
In the secondary circuit, the entry end of shutoff valve 2 joins in the end of supplying pipe 101a and the pipeline 1, and the end of supplying pipe 101b and the outlet end of shutoff valve 2 join, and then remaining that two of two supplying pipe 101a and 101b terminates on the reciprocable valve 107.Supplying pipe 101 is connected on the output terminal of reciprocable valve 107, is connected with gas tank 32 by normal pressure supplier 100 again.Reference number 105 and 106 is respectively represented an injection valve.Such structure has been arranged, and gas tank 32 just can effectively be filled under the situation of needs, because that end that reciprocable valve 107 can select pipeline 1 to have elevated pressures automatically, and itself and supplying pipe 101 is connected.
For exemplify a gas tank 32 gentle/example that oil type pressurized machine 6 combines, a gas/oil type pressurized machine 6 that places gas tank 32 inside has been described in Figure 10.Utilize the mode of welding or using 0 type packing ring, with the two ends of spherical cap 37b and 37c sealing cylinder 37a.The use of connecting rod 37d makes the binding between them tightr, has strengthened air-proof condition.Oil cylinder 38a and the coaxial setting of cylinder 37a.Center on the air chamber 37e of the space of oil cylinder 38a as gas tank 32.Piston 38b and piston rod 38c are arranged on the inside of pressurized machine 6.Use as air chamber 38d in space between oil cylinder 38a and the piston rod 38c.With the through hole 37g that pore 37h together provides air chamber 37e and air chamber 37i are communicated.At the front end of the 38e of the grease chamber of the front end that places piston rod 38c, an oilhole 38f is arranged.It is connected with the cylinder 3a of actuator 3.In order to detect the mobile position of piston rod 38c, be provided with a device that utilizes air hole 38g (such as, a sensor 33).
To discuss below and use Fig. 7 and shown in Figure 10: gas tank 32 as the situation of power source.Represent initial pressure and volume with following formula.The actuator 3 that is used for critical cut-out, valve remains on open mode usually, and can produce three kinds of actions, promptly opens to close to open and closes, even during power failure occurring.In the case, second kind of action: close to open and have bigger moment of torsion, need reach aforesaid essential moment of torsion.
The motion oil mass of actuator 3 is as follows:
π/4×9
2×10×2＝1,272.3cm
3
The amount of exercise of the bar of pressurized machine 6 is as follows:
1,272.3/π/4×11.2
2×1
1 1
1＝12.91cm
The volume W of power source end, an action of the bar of pressurized machine 6 is needed
W＝π/4×18
2×12.91
＝3,285cm
3
≈3.31
The volume of supposing gas tank 32 is 20 liters, initial pressure be 80 kilogram forces/centimetre
2Gauge pressure, the pressure P of the gas tank 32 of (second action before) after an action is finished
1To be shown below:
P
1＝(80+1033)×20/20+3.3
=69.556 kilogram forces/centimetre
2
=68.523 kilogram forces/centimetre
2(gauge pressure)
The pressure P of the gas tank 32 of (the 3rd action before) after two actions
2As follows:
P
2＝(68.523+1.033)×(20+3.3)/20+3.3+3.3
=60.927 kilogram forces/centimetre
2
=59.894 kilogram forces/centimetre
2(gauge pressure)
The pressure P of the gas tank 32 after three actions are finished
3As follows:
P
3＝(59.894+1.033)×(20+3.3+3.3)/20+3.3+3.3+3.3
=54.203 kilogram forces/centimetre
2
=53.170 kilogram forces/centimetre
2(gauge pressure)
Output torque T during two actions
2For:
T
2＝π/4×9
2×10×68.523×2.58×2
=224,937 kilograms centimetres
=2,249 kilogram-meters
Output torque T in three course of action
3For
T3＝π/4×9
2×10×59.894×2.58×2
=196,611 kilograms centimetres
=1,966 kilogram-meters
Three action output torque T afterwards
3For
T
3＝π/4×9
2×10×53.170×2.58×2
=174,538 kilograms centimetres
=1,745 kilogram-meters
These results all show in Figure 11.
To the shutoff valve 2 of present embodiment, open moment of torsion required in the closing motion process and be approximately 450 kilogram-meters.From the above data that provide as can be seen, 20 liters volume of finding from above calculating and 80 kilogram forces/centimetre
2The initial pressure of gauge pressure is enough to gas tank 32, and this point is conclusive.
One of just selecting from previous embodiment of example discussed above is certainly without any the qualification effect on the meaning.
The 4th above-mentioned embodiment operating process will be described below.
As shown in Figure 7, between the two ends of the cylinder 3a of pressurized machine 6 and actuator 3, be provided with oil pipe 5c, 5d and 5e, also be provided with solenoid valve 10, oil hydraulic pump 34, hand pump 7a, speed controller 11 and 12, check valve 14 and the 14a and the reduction valve 13 that are used for switching oil pipe 5 simultaneously.Though solenoid valve 10 is equipped with manual operating handle, it is applicable to that still the operation signal that send in the emergency signal that sent by pressure switch 17 or control room makes it produce action.
In this structure, the gas pressure in the gas tank 32 makes its pressurization by pressurized machine 6, and this moment, the fluid pressure that produced was used for drive actuator 3, thereby opens and closes the shutoff valve 2 in the pipeline 1.
The gas pressure that inert gas such as nitrogen produced of sealing, acts on the air chamber 6b of gas/oil type pressurized machine 6 in the excursion of regulation forward through a through hole 6c in the gas tank 32.In the 6a of the grease chamber of pressurized machine 6, the valve open pressure end 3c of the cylinder 3a of hydraulic fluid port and actuator 3 couples together by oil pipe 5c.Pressurized machine 6, raises the pressure of liquid as power with gas pressure, and the hydraulic pressure after pressure raises is on the piston 3b of valve open pressure end 3c.The another side of cylinder 3a is valve closing pressure end 3b by solenoid valve 10, and is that intermediary links to each other with fuel tank 8 with oil pipe 5d.
When the downstream of gas piping 1 breaks down, when causing leaking, the pressure in the pipeline 1 can descend, pressure switch 17 these faults of reflection, and send critical shutoff signal, or disconnect shutoff valve 2, perhaps the signal that drives shutoff valve 2 is sent in the control room.In the case, solenoid valve 10 is connected oil pipe 5, as shown in Figure 9.
Then, the valve open pressure end 3c of cylinder 3a communicates with fuel tank 8, and the valve closing pressure end 3e of cylinder 3a and the 6a of grease chamber of pressurized machine 6 communicate simultaneously.Like this, act on the valve closing pressure end 3e of cylinder 3a through the fluid pressure of pressurized machine 6 superchargings, promote piston 3d to the right, and then close shutoff valve 2, simultaneously, the piston 3b that is connected with piston 3d makes the oil in the valve open pressure end of cylinder 3a enter fuel tank 8.
When sensor 33 or position detecting device are measured the change in displacement of piston 6d of pressurized machine 6, oil hydraulic pump 34 actions, oil in the fuel tank 8 is opened check valve 14, move forward into the 6a of grease chamber of pressurized machine 6, the fluid pressure that produces is reset the piston 6d of pressurized machine 6, forces gas in the air chamber 6b of pressurized machine 6 to turn back in the gas tank 32 that forms around the periphery of pressurized machine 6.
Gas pressure regulation in the gas tank 32 is to be formed in gas tank 32 by a kind of inert gas such as nitrogen-sealed, and it, acts on the air chamber 6b of gas/oil type pressurized machine 6 in the excursion of regulation through through hole 6c.In the 6a of the grease chamber of pressurized machine 6, the valve open pressure end 3c of the cylinder 3a of hydraulic fluid port and actuator 3 joins by oil pipe 5c.Pressurized machine 6 is a power with the gas pressure, and with the fluid pressure supercharging, the fluid pressure after the supercharging acts on the piston 3b of valve open pressure end 3c.The another side of cylinder 3a is that valve closing pressure end 3b passes through solenoid valve 10, is intermediary with oil pipe 5d, is connected with fuel tank 8.
When the downstream of gas piping 1 breaks down, when causing leaking, the pressure in the pipeline 1 can descend; Pressure switch 17 these faults of reflection, and send critical shutoff signal or disconnect shutoff valve 2, perhaps the signal that drives shutoff valve 2 is sent in the control room.In the case, solenoid valve 10 is connected oil pipe 5, as shown in Figure 9.
The valve open pressure end 3c of cylinder 3a communicates with fuel tank 8, and the valve closing pressure end 3e of cylinder 3a and the 6a of grease chamber of pressurized machine 6 communicate simultaneously.Like this, act on the valve closing pressure end 3e of cylinder 3a through the fluid pressure of pressurized machine 6 superchargings, promote piston 3d to the right, and then close shutoff valve 2, simultaneously, the piston 3b that is connected with piston 3d makes the oil in the valve open pressure end of cylinder 3a enter fuel tank 8.
When sensor 33 or position detecting device are measured the displacement of piston 6d of pressurized machine 6, oil hydraulic pump 34 actions, oil in the fuel tank 8 is through check valve 14, move forward into the 6a of grease chamber of pressurized machine 6, the fluid pressure that produces is reset the piston 6d of pressurized machine 6, forces gas in the air chamber 6b of pressurized machine 6 to turn back in the gas tank 32 that forms around the periphery of pressurized machine 6.
More particularly, because normal pressure supplier 100 is made up of backpressure valve 103 and check valve 104, therefore, when the gas pressure in the gas tank 32 is lower than prescribed level, the fluid of pipeline 1 of flowing through enters gas tank 32 by check valve 104, up to gas pressure be elevated to be higher than prescribed level till.When the gas pressure in the gas tank 32 is higher than prescribed level owing to the effect of oil hydraulic pump 34, backpressure valve 103 actions, the gas of surplus is put into the other end (pipeline 1) of backpressure valve 103, so just make the gas pressures in the gas tank 32 can remain on the level of regulation.As with supplying pipe 101 and another pipeline 1 ' be connected, shown in dot and dash line among Fig. 7, then above-mentioned excess gas will be placed into another pipeline 1 '.
The result is like this, and the gas pressure in the gas tank 32 can keep stable in the level of regulation.So gas tank 32 needs to carry out the displacement of gas make-up or cylinder anything but again, but also safe and reliable, has good and economic, even gas pressure therein is higher than under the situation of prescribed level, superfluous gas also will turn back to pipeline 1 and not put into atmosphere.Secondary circuit shown in Figure 8 also makes the gas of gas tank 32 fill and can finish expeditiously, because it can select the higher end of pressure of pipeline 1 automatically, it is received on the supplying pipe 101.
Claims (10)
1. the shutoff valve in the propellant pipeline or the valve actuator of cut-off valve, it is characterized in that: between the gas tube that branches out at basic end and the cylinder of actuator from gas piping, a gas/oil type pressurized machine and an oil hydraulic pump are set, and both are coupled together with a pipe, pressurized machine with the pressure of the basic end of gas piping as power source, fluid pressure is raise, and then drive actuator, close shutoff valve or open cut-off valve, to place the oil hydraulic pump between pressurized machine and the actuator to reset pressurized machine, the gas in the pressurized machine is returned in the gas piping by the above-mentioned gas pipe simultaneously.
2. a kind of valve actuator according to claim 1 is characterized in that: have a fuel tank to be connected with above-mentioned oil hydraulic pump.
3. according to claim 1 or the described a kind of valve actuator of claim 2, it is characterized in that the oil mass that a stroke of above-mentioned pressurized machine is discharged is enough to be used for guiding the stroke that is no less than two above-mentioned cylinders.
4. one kind is used for opening or closing the shutoff valve in the gas piping or the valve actuator of cut-off valve, the following formation of its structure: a gas tube that will branch out from the basic end of above-mentioned gas piping is by a reduction valve, be connected with the air chamber of a gas/oil type pressurized machine, reduction valve gentle/be provided with a check valve between the oil type pressurized machine, the gas tube that will be connected with above-mentioned air chamber is by a reduction valve simultaneously, receive the other end of gas piping, make above-mentioned gas tube and the gas pressure between pressurized machine relation satisfy representation, pressure in the air chamber of the pressure＞pressurized machine of the other end of the pressure＞gas piping of the basic end of gas piping, between the cylinder of the grease chamber of pressurized machine and actuator, be provided with an oil pipe, pressurized machine is to be applied to gas pressure in its air chamber as power source, increased pressure with the liquid in the oil pipe, utilize this fluid pressure to make actuator action, close or open said shutoff valve or cut-off valve, make the oil hydraulic pump that is arranged in above-mentioned oil pipe, reset above-mentioned pressurized machine with the fluid pressure that further is pressurized that is arranged in above-mentioned oil pipe, make the gas that is arranged in pressurized machine, be directed to the other end of above-mentioned gas pipeline through the above-mentioned gas pipe.
5. a kind of valve actuator according to claim 4 is characterized in that: above-mentioned gas can be fed to stream to be had in another pipeline of same gas, and does not enter the other end of above-mentioned gas piping.
6. valve actuator, its structure is in gas piping, a shutoff valve or cut-off valve are provided, a hydraulic cylinder type actuator is set, when being lower than the pressure of basic end with the pressure of the other end of the above-mentioned pipeline of box lunch, open or close shutoff valve or cut-off valve, and will place the oil pipe of each end of the cylinder of actuator to be connected with the grease chamber of above-mentioned each gas and oil type pressurized machine, thereby the gas tube that the air chamber of one of them pressurized machine and the other end from above-mentioned gas piping are branched out is connected, and the air chamber of another pressurized machine links to each other with the gas tube that basic end from above-mentioned gas piping branches out.
7. a kind of valve actuator according to claim 6, it is characterized in that: the oil pipe that is provided with between an end of above-mentioned cylinder or the other end and above-mentioned pressurized machine can be selectively be switched on or switched off with above-mentioned fuel tank, and then the oil in the fuel tank can turn back in the above-mentioned cylinder or pressurized machine via the effect of oil hydraulic pump.
8. one kind is used for driving the shutoff valve of the pipeline that is positioned at conveyance fluid or the valve actuator of cut-off valve, its structure is: a gas tank inside pressurized machine is set, link to each other with a valve driving actuator, the part of above-mentioned gas tank and pressurized machine is connected in inside, simultaneously, by a supplying pipe, by the normal pressure supplier, above-mentioned gas tank and above-mentioned pipeline are coupled together, thereby make the pressure-driven valve drive actuator after the pressure with above-mentioned gas tank is the pressurized machine pressurization of power source, and then drive shutoff valve or cut-off valve.
9. a kind of valve actuator according to claim 8, it is characterized in that: the other end of backpressure valve is connected with the entry end of check valve, the basic end of backpressure valve links to each other with the outlet end of check valve, thereby form the normal pressure supplier, and the other end of above-mentioned backpressure valve is connected with the supplying pipe of pipeline one end, and the basic end of above-mentioned backpressure valve links to each other with the supplying pipe of gas tank one end simultaneously.
10. according to Claim 8 or the described a kind of valve actuator of claim 9, it is characterized in that: the gas of filling gas tank with authorized pressure can be a kind of in air, nitrogen, carbon dioxide or the inert gas, it can mix with the fluid in the pipeline, and any problem can not appear, when the gas pressure in the above-mentioned gas tank is lower than prescribed level, the fluid of above-mentioned pipeline of flowing through will be filled gas tank, so just can make the gas pressure of gas tank remain on constant level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95197194 CN1171838A (en) | 1995-09-20 | 1995-09-20 | Valve driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95197194 CN1171838A (en) | 1995-09-20 | 1995-09-20 | Valve driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1171838A true CN1171838A (en) | 1998-01-28 |
Family
ID=5083281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95197194 Pending CN1171838A (en) | 1995-09-20 | 1995-09-20 | Valve driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1171838A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444743A (en) * | 2010-10-08 | 2012-05-09 | 费希尔控制国际公司 | Volume booster with stabilized trim |
| CN102713382A (en) * | 2008-12-18 | 2012-10-03 | S.P.M.流量控制股份有限公司 | Hydraulic unloading valve |
| CN112443700A (en) * | 2019-09-03 | 2021-03-05 | 大连中和聚能自动控制系统有限公司 | Automatic control device for turn-off of high-pressure auxiliary valve |
| CN113236848A (en) * | 2021-06-03 | 2021-08-10 | 浙江中德自控科技股份有限公司 | Valve control system capable of automatically cutting off air source fault |
-
1995
- 1995-09-20 CN CN 95197194 patent/CN1171838A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102713382A (en) * | 2008-12-18 | 2012-10-03 | S.P.M.流量控制股份有限公司 | Hydraulic unloading valve |
| CN102444743A (en) * | 2010-10-08 | 2012-05-09 | 费希尔控制国际公司 | Volume booster with stabilized trim |
| CN102444743B (en) * | 2010-10-08 | 2017-01-18 | 费希尔控制国际公司 | Volume booster with stabilized trim |
| CN112443700A (en) * | 2019-09-03 | 2021-03-05 | 大连中和聚能自动控制系统有限公司 | Automatic control device for turn-off of high-pressure auxiliary valve |
| CN112443700B (en) * | 2019-09-03 | 2022-09-13 | 大连中和聚能自动控制系统有限公司 | Automatic control device for turn-off of high-pressure auxiliary valve |
| CN113236848A (en) * | 2021-06-03 | 2021-08-10 | 浙江中德自控科技股份有限公司 | Valve control system capable of automatically cutting off air source fault |
| CN113236848B (en) * | 2021-06-03 | 2023-05-26 | 浙江中德自控科技股份有限公司 | Valve control system for automatic cutting off of air source fault |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4611924B2 (en) | Hydrogen compressor system | |
| CN1200872C (en) | Hydraulic control apparatus for industrial vehicles | |
| CN1081759C (en) | Valve driving apparatus | |
| AU603104B2 (en) | Improved pumping device, particularly suitable for compressing fluids on deep sea-bottoms | |
| KR100263615B1 (en) | Valve driving device | |
| CN1077209C (en) | Engine-brake assisting system | |
| CN101842305A (en) | Method and apparatus in a vacuum conveying system of material | |
| CN1171838A (en) | Valve driving device | |
| CN105275767B (en) | The pressure compensator and the concrete pump set of concrete pumping | |
| KR101630733B1 (en) | Lifting system and lifting method for jib of project machine and project machine thereof | |
| US5385452A (en) | Hydraulic fluid pressurizer with fluid cushioning means | |
| CN1191507A (en) | High-speed safety circuit of hydraulic machine | |
| CN101672721A (en) | Intelligent comprehensive test bed for hydraulic oil pipes | |
| US20080107553A1 (en) | Method of pumping drill cuttings and pump for moving drill cuttings | |
| CN102410911B (en) | Detection method of gas tightness of CNG fuel system and detection apparatus thereof | |
| CN1256511C (en) | Vehicle mounted concrete transfer pump | |
| CN202787914U (en) | Hydraulic joint filling machine | |
| CN205715725U (en) | Planker guiding valve and there is its delivery pump and pump truck | |
| CN105443978A (en) | Hydraulic pressurized natural gas filling substation system | |
| CN201862505U (en) | Multifunctional spray-coating machine | |
| CN2668888Y (en) | Concrete pump with pipe-blocking-proof function | |
| JP2003148688A (en) | Method, system and device for supplying compressed natural gas | |
| CN1249373C (en) | Liquefied petroleum gas filling method and apparatus | |
| CN201809159U (en) | Novel oil transfer arm emergency release device | |
| CN105485516B (en) | The inner-cooled hydraulic booster machine of natural gas supply sub-station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) |