CN101225844B

CN101225844B - System and valve devcie for quickly and exigently closing hydraulic actuated valve

Info

Publication number: CN101225844B
Application number: CN200710186178XA
Authority: CN
Inventors: 库尔特·比肖; 乌尔里克·丹泽
Original assignee: Damcos AS
Current assignee: Damcos AS
Priority date: 2006-12-04
Filing date: 2007-12-04
Publication date: 2010-12-22
Anticipated expiration: 2027-12-04
Also published as: KR100957739B1; CN101225844A; KR20080051097A

Abstract

The invention provides a hydraulic control system for controlling the valve. Two channels are formed between the connection port and control port, therefore the flow along the opposite direction in the channel can control the movement of the valve. The valve is subjected to emergency operation by the emergent liquid in an emergency channel between an emergency port and a first control terminal, namely hypervelocity operation. The emergent liquid flows in a reflow channel to reflow and the reflow channel forms a flowing passage between a second control terminal and a second connection terminal. For the convenience of emergent liquid reflowing, the invention provides a reflow channel for forming an additional passage between the second control terminal and a first connection terminal. Therefore a supply pipe and reflow pipeline are used to reflow the emergent liquid at emergency circumstance.

Description

The system and the control valve unit that are used for the quick emergency cut-off of hydraulic actuated valve

Technical field

The present invention relates to for example to be used for the hydraulic control system that is connected with fluid pressure drive device, such as actuator or hydraulic control valve.The invention further relates to the method for hydraulic system, valve and operating valve.

Control system forms the first passage between first connecting port and first control port, and the second channel between second connecting port and second control port.Therefore, fluid can be in a passage along a direction, for example the fluid source under the pressure is towards the hydraulic pressure driven device, and in another passage in opposite direction, for example conduct towards storage tank from the hydraulic pressure driven device.

The emergency access that is arranged between the emergency entrance and first control port can drive the hydraulic pressure driven device with different actuation speeds.Emergency access for example can provide relatively large fluid stream, and it is called urgent fluid hereinafter.Urgent fluid for example can be in urgency, for example carry out guiding first control port under the situation of valve closing operation, described valve closing operation for example is used to stop chemical reaction or is used to prevent that fluid from flowing, and for example superheated steam or liquid and potentially dangerous, inflammable, poisonous or inert gas or liquid flows.

The return flow line that forms flow passage between second control port and second connecting port is provided, thereby during instant operation, fluid is flowed from hydraulic pressure driven device guiding storage tank, and use two different control valve units with flowing in the control hydraulic control system.Control valve unit is suitable for preventing that fluid stream from flowing to first connecting port from first control port, unless there is the situation of certain pressure in second connecting port or second channel.This has prevented that urgent fluid from flowing out by first connecting port during instant operation.

The emergency valve device is suitable for preventing that fluid from flowing in the return flow line, unless there is the certain pressure situation in emergency entrance place or emergency access.This prevented one of control port flow and the hydraulic pressure driven device on the fluid of working under the situation of not carrying out predetermined work, turn back to storage tank.

Background technique

Hydraulic control system typically is used in combination with control gaseous or liquid with valve.In this combination, the hydraulic pressure driven device is made of actuator, and actuator is operated valve and valve member is moved between the opening and closing position.For instance, storage tank management peculiar to vessel is sometimes based on single-acting or double-action balance actuator to operating on the valve shaft, and valve shaft makes valve member or blade rotation with the control fluid flowing path.

But sometimes, very apace reaction to dam be essential.For instance, might for security reasons under leakage situation, must very rapidly close gas line.For emergency cut-off, be called ESD hereinafter, the independent hydraulic tube of the urgent fluid of conduction typically is set, thereby makes valve move to its closed position at a relatively high speed.For fair speed is provided, under elevated pressures, typically provide urgent fluid with high flow velocities.Normally, valve cuts out during being controlled at ESD relatively slowly, leads back storage tank at the hydraulic fluid that offers the hydraulic pressure driven device during the ESD or by the pipeline that additional line or utilization are used to the control fluid was refluxed in the valve down periods in normal running.For economic aim, in order to make the space consuming optimization or to avoid vibration, the size that is used for the reflux pipeline of normal running typically is used for slow actuating, and therefore, reflux pipeline may cause undesirable big pressure drop when the urgent fluid of conduction.Big pressure drop may cause slowly closing of during instant operation valve, thereby weakens Security.Another side effect is that the pressure drop in the reflux pipeline may cause pressure increase between second connecting port and second control port, it may trigger control valve unit once more so that fluid flows to first connecting port from first control port, and this is undesirable during the instant operation of system.

Summary of the invention

The purpose of one embodiment of the present of invention is to improve for example control of valve of apply device.In first aspect, the invention provides a kind of hydraulic control system, wherein the return flow line forms the additional flow path between second control port and first connecting port.

For example for cut-off valve, first connecting port can be connected on the pipeline that the pressure fluid of working on the hydraulic pressure driven device is provided, and second connecting port can be connected on the pipeline that makes fluid return storage tank.During opposite guide movement, for example in order to open valve, port can oppositely connect, and promptly second connecting port is connected on the pressure fluid, and first port is connected on the storage tank.

Because additional flow path, under normal operation, when pressure fluid being provided for first control port, promptly for example during cut-off valve, be used to pipeline that fluid is returned, and the pipeline that under normal operation, is used for providing fluid to first control port, can be used to make fluid reflux to storage tank.Therefore, relevant with the above-mentioned pressure drop that causes by use pipeline (its size is made and is used for slow actuating) defective can reduce or avoid fully.In operation, for example in the device for ships aboard ship, have pressure fluid source and the storage tank that is used for reflux fluid usually in position away from apply device.Like this, very Chang supply makes pressure fluid source, storage tank be connected with control system with reflux pipeline, and control system and apply device direct neighbor location.According to the present invention, very Chang supply and reflux pipeline can be used as reflux pipeline during instant operation or quick closedown, and can eliminate or reduce further side effect under the situation that need not the costliness on the ship, the additional line that takes up room.

Control system can be incorporated in the single body, and wherein passage is formed in the described body as groove, and described groove extends between the opening that forms the port on the outer surface.Groove can be molded aperture or the boring between the port.Port can have internal thread, the flange that is used to weld, O shape ring, bolt or similar device, is used for the pipeline of port and apply device is assembled together, and is used for and will provides the pipe-line system that centers on of pressure fluid to be attached to fluid reservoir.

As mentioned above, control valve unit is suitable for preventing in second channel and the emergency access according to certain pressure flowing of situation in advance.Particularly, this situation can be respectively and the limit difference correlation between the pressure in reference pressure and second channel or the emergency access in advance.In control valve unit, reference pressure can depend on the pressure in the first passage, and in the emergency valve device, reference pressure can depend on the pressure in the return flow line.

In corresponding mode, control valve unit can prevent further that fluid from flowing to second connecting port from second control port, unless there is the certain pressure situation in the first passage.Equally, situation can be above the pressure in the first passage and the moment of the limit difference between the reference pressure in advance, and reference pressure can depend on the pressure in the second channel.

Control valve unit is positioned between connecting port and the control port.Usually, as long as the pressure reduction on the valve is lower than valve opening pressure, control valve unit just can keep cutting out.Under this pressure, valve member lifts and opens passage from its valve seat.

Control valve unit can comprise standard check valves, for example comprises the type of guiding valve, and this guiding valve can move in shell according to the pressure in one of passage.Safety check can be arranged in one of first and second passages, thereby allowing to flow and to prevent along a direction flows in passage in opposite direction.Safety check can also comprise pilot operated safety check, be called PCV hereinafter, wherein the pressure in one of first and second passages lifts the valve member in another passage, perhaps safety check can comprise two pilot operated safety check, be called DPCV hereinafter, wherein the pressure in any one lifts the valve member in another passage in first and second passages.Therefore, DPCV is suitable for preventing that fluid from flowing to first connecting port from first control port, unless in second channel, have certain pressure situation in advance, and prevent that fluid from flowing to second connecting port from second control port, unless in first passage, there is certain pressure situation in advance.The pressure of control valve unit in emergency access prevents that the fluid in first and second passages from flowing when surpassing pressure in first and second passages.

The return flow line can comprise the first portion that has PCV, and described PCV has valve member, and it prevents that usually fluid from flowing to first and second connecting ports from second control port.Valve member can lift from its valve seat under the pressure in emergency access.Like this, prevent that the fluid in first and second passages from flowing, unless in emergency access, there is the situation of certain pressure, for example, unless the pressure and the limit between the reference pressure that surpass in the emergency access are poor, ultimate pressure for example depends on the pressure at least one place in first and second connecting ports.

In the downstream behind the PCV (when streamwise from control port when the connecting port is observed), the return flow line can be divided into and is connected to first path on second connecting port and is connected to alternate path on first connecting port.

Except above-mentioned valve and emergency valve device, hydraulic control system can comprise the safety check in each flow passage, thereby prevents in these paths along the flowing towards the direction of second control port from the connecting port.

In second aspect, the invention provides a kind of hydraulic system, comprising:

Pressure fluid source,

Be used to collect the storage tank of reflux fluid, and

Apply device, it is suitable for carrying out work on the object according to being flowing in of pressure fluid.Apply device for example can be the actuator of working on the valve, and it can comprise first control port and second control port, and fluid is received in one of control port and from control port another and returns.

Hydraulic system may further include the hydraulic control system of the above-mentioned type relevant with a first aspect of the present invention.

Hydraulic system may further include and is used to supply with high-pressure liquid and makes fluid return the pipe-line system of storage tank.Pipe-line system can comprise first pipeline that is connected on first connecting port and second pipeline that is connected on second connecting port.This system can move between following configuration:

First configuration, wherein first pipeline makes first connecting port be connected with pressure fluid source, and second pipeline makes second connecting port be connected with storage tank; And

Second configuration, wherein first pipeline makes first connecting port be connected with storage tank, and second pipeline makes second connecting port be connected with pressure fluid source.

Hydraulic system can further be suitable for the 3rd configuration, wherein first and second connecting ports both be connected to storage tank.

Because urgency may need the Fluid Volume that increases or the hydrodynamic pressure of increase, this system may further include the emergency pressure fluid source, and it separates with pressure fluid source and is directly connected on the emergency entrance by adding urgent pipeline.In order in case of emergency to reduce pressure drop, urgent pipeline can be bigger with respect to first and second pipelines.Its cross-section area for example is in the 1.5-2.5 scope of cross-section area of one of first and second pipelines.On the other hand, first and second pipelines can have equal cross-section area.

Apply device and hydraulic control system can be positioned to directly adjacent to each other, and they can be attached to one another or they can form single parts.On the other hand, pressure fluid source and storage tank can be located away from apply device, thus, hydraulic control system provides first and second pipelines, equally selectively, urgent pipeline is compared with the passage in the control system, and compares very long with the passage between apply device and the hydraulic control system.Like this, additional via between second control port and first connecting port can be used the first and second overlength pipelines that make fluid return storage tank during instant operation, therefore, help reducing the flow resistance that is used for reflux fluid, therefore can carry out instant operation to system faster.

In the third aspect, the invention provides actuator, it comprises and can be displaced into two elements between the limit position flowing into or flow out under the fluid effect of first and second ports.

Actuator comprises the control system above with reference to the described type of a first aspect of the present invention, and control system is provided with each control port that is connected on each first and second port.

Actuator can be the type with two chambers that separated by piston.When fluid flowed into one of port, it made piston displacement, and piston makes fluid flow out second port then.Actuator can also be fluid flows to another port by device from one of port a type.

In fourth aspect, the invention provides a kind of valve that comprises valve member, this valve member can move between two limit positions in valve passage, thereby different flow resistances is provided therein.Above-mentioned actuator and be applied to make valve member between limit position, to move above with reference to the control system of the described type of a first aspect of the present invention.

Especially, valve can be 1/4th rotary valves, and wherein 90 of valve member degree rotations make member move to another limit position from one of limit position.

Aspect the 5th, the invention provides the method for a kind of operating valve system, comprise the valve that flows and open or close according to fluid, under the normal operations situation, provide towards the fluid forward of valve flow to preceding pipeline, under the normal operations situation, provide away from the mobile reflux line of the fluid backward of valve, and under the limit operation situation, provide towards the mobile urgent pipeline of the urgent fluid of valve.

Described method is included in interrupts flowing forward of fluid under the limit case, and in the mobile step of urgent fluid backward that in preceding pipeline and reflux line, provides away from valve.The oil hydraulic pump that can make valve with the high-pressure liquid supply source of any kind, for example be used to supply with hydraulic fluid to preceding pipeline links to each other, and the storage tank that reflux line can make valve with the place of distributing fluids, for example be used to collect hydraulic fluid is connected.

The normal operations situation is the situation that wherein requires the characteristic that normally opens or closes of valve, and the limit operation situation is the situation that wherein requires to open or close faster valve.

Described method can comprise according to the implicit any step of reference of the present invention first, second, third and the described system of fourth aspect.Especially, described method can comprise and prevents from backward to flow the step that flows, and to prevent the urgent step that flows backward, unless there be urgent flowing unless exist forward.And described method can comprise, and is opposite to preceding pipeline and reflux line, and making provides the fluid backward away from valve to flow under the normal operations situation to preceding pipeline, and reflux line provides the fluid forward towards valve to flow under the normal operations situation.

Description of drawings

Hereinafter, the preferred embodiment of the present invention is described in more detail with reference to the accompanying drawings, wherein:

Fig. 1 has schematically shown according to control system of the present invention;

Fig. 2 has schematically shown the hydraulic system that comprises hydraulic control system shown in Figure 1;

Fig. 3 has shown actuator and by the valve of this actuator operated; And

Fig. 4 has schematically shown another embodiment according to hydraulic control system of the present invention.

Embodiment

Fig. 1 has shown the hydraulic control system 1 that is used to control hydraulic control device 2.Control system comprises the first passage 3 between first connecting port 4 and first control port 5.First control port 5 is connected on the control port 6 of device 2.Control system also comprises the second channel 7 between second connecting port 8 and second control port 9.Second control port 9 is connected on second control port 10 of device 2.

Two pilot operated safety check (DPCV) 11 comprise the

valve member

12,13 that is arranged in each passage.Each valve member prevents that under its closed state fluid from flowing to connecting

port

4,8 from control port 5,9.Yet the valve member 12 that acts in the first passage 3 can be mentioned from its valve seat under the pressure in the second channel 7, and the valve member 13 that acts in the second channel 7 can be mentioned from its valve seat under the pressure in the first passage 3.This is provided by the control channel 14 between two valve members.Help by this way to make in the first passage 3 and open, be used for refluxing to second connecting port 8 from second channel 7 interior devices 2 towards flowing forward of device 2.DPCV can be a guiding valve, and it slides in the enclosure, thereby opens and closes above-mentioned passage.Be subjected to the influence of first passage 3 internal pressures along the slip of a direction, be subjected to the influence of second channel 7 internal pressures along the slip of another direction.Thereby the pressure reduction between the

passage

3 and 7 is opened and is illustrated as one of valve member of 12 and 13.

Under normal circumstances, control gear 26 is positioned to as shown in Figure 2, and wherein two connecting

ports

4,8 are connected to storage tank.Therefore, hydraulic control device 2 stops.In the normal running of hydraulic control device 2, one of two connecting

ports

4,8 are connected to pressure line, and in two connecting ports another is connected to the storage tank pipeline.This configuration for example obtains by pressing switching push button 32 (with reference to Fig. 2 and corresponding description).

In case of emergency, can hydraulic fluid is provided for device 2 by emergency access 15, emergency access extends between the emergency entrance 16 and first control port 5.If installing 2 is valve actuators, the port that first control port 5 closes valve in the time of can being pressurization.In this case, emergency access 15 provides the quick closedown of passage (not shown), and wherein valve inserts in the passage.When fluid offered apply device 2 by emergency access 15, fluid can return by

return flow line

17,18,19 from installing 2.By additional via 17,

return flow line

17,18,19 connects second control port 9 and first connecting port 4, and in alternate path 18,

return flow line

17,18,19 connects second control port 9 and second connecting port 8.In original via 19,

return flow line

17,18,19 comprises PCV20, and it prevents that fluid from passing through

return flow line

17,18,19 along flowing from the direction of second control port 9 towards first and second connecting

ports

4,8, unless emergency entrance 16 places have pressure.

Each first and

second path

17,18 comprises

safety check

21,22, and it prevents to reflux towards second control port 9, thereby prevents in the connecting

port

4,8 another of hydraulic fluid short-circuit cycle in one of connecting

port

4,8.

Insert excess pressure valve 23 to prevent the control system overpressure.Connector assembly 24 has made things convenient for for example connection of the external equipment of pressure or temperature transducer etc.

Fig. 2 has shown hydraulic system 25.System 25 comprises the hydraulic control system 1 of type shown in Figure 1, storage tank T, pressure pump P, emergency pressure pump eP, control gear 26, the first pipelines 27 and second pipeline 28.Pump P constitutes pressure fluid source, and it works by 1 pair of pressure-operated device 2 of hydraulic control system.Storage tank T collects the fluid that returns from pressure-operated device 2, and this fluid is transmitted back to pump P or urgent pump eP by suction pipe 29.First pipeline 27 is connected to second pipeline 28 on first connecting port 4 and is connected to that emergency entrance 16 is connected on the urgent pump eP that constitutes urgent fluid source by urgent pipeline 30 on second connecting port 8.With compare in the control system 1 and in control system 1 and other passage of installing between 2, first and

second pipelines

27,28 can be very long.

System comprises the control gear 26 that can switch between three different configurations.In first configuration of working in Fig. 2, two

pipelines

27,28 are connected on the storage tank T, thereby both are formed in the return flow line that is used for urgent fluid during the instant operation of system 1.By pressing first switching push button 31, system switches to second configuration, and wherein first pipeline 27 is connected on the storage tank T, and second pipeline 28 is connected on the pump P.Be connected on the pump P by pressing second switching push button, 32, the first pipelines 27, second pipeline 28 is connected on the storage tank T.The size of urgent pipeline 30 and storage tank pipeline 32 is made the flow section that doubles in first and

second pipelines

27,28 each.

Pressure in the emergency entrance 16 can be advantageously with first and

second pipelines

27,28 both storage tanks that automatically lead.For this reason, control gear 26 can perhaps be positioned to as shown in Figure 2 by urgent fluid usually by the pressure in the emergency entrance 16, in the urgent pipeline 30, perhaps can insert the additional valve (not shown).Additional valve can move under the pressure of urgent fluid, and can first and

second pipelines

27,28 be connected on the storage tank T according to this pressure.

Fig. 3 has shown actuator 34, and it is arranged to make valve member 35 to move between the position of the position of valve member 35 butterfly gate passages 36 and valve member 35 open channels 36.Actuator 34 can advantageously be controlled by the hydraulic control system of using the above-mentioned type.

Fig. 4 has shown another selectable hydraulic control system.This system is equivalent to system shown in Figure 1, and wherein additional PCV37 is inserted in the second channel 7.Additional PCV37 is provided with spring 38, its with the PCV37 bias voltage to the normally open position.Therefore but the pressure in the emergency access 15 will be closed PCV37, prevent that the urgent fluid that refluxes in

return flow line

18,19 from providing the pressure in the second channel 7 between second connecting port 8 and DPCV11.This pressure may be caused by the pressure drop in second pipeline 28 between second connecting port 8 and storage tank T.This pressure may cause opening unintentionally of first passage 3, and therefore urgent fluid directly discharges to storage tank T from urgent pump eP, and does not carry out the predetermined work of device 2, and for example the predetermined of valve closes.PCV37 is controlled via control pipeline 39 by the pressure in the emergency access 15.

Claims

1. a hydraulic control system (1), comprise the first passage (3) that is positioned between first connecting port (4) and first control port (5), be positioned at the second channel (7) between second connecting port (8) and second control port (9), be positioned at the emergency access (15) between emergency entrance (16) and first control port (5), be formed on the return flow line (17 of the flow passage (18) between second control port (9) and second connecting port (8), 18,19), first control valve unit (11), and emergency valve device (20), described first control valve unit (11) is suitable for preventing that fluid from flowing to first connecting port (4) from first control port (5), unless in second channel (7), have the certain pressure situation, and emergency valve device (20) is suitable for preventing return flow line (17,18,19) fluid in flows, unless in emergency access (15), have the certain pressure situation, it is characterized in that, described return flow line (17,18,19) form the additional flow path (17) that second control port (9) is connected with first connecting port (4).

2. control system as claimed in claim 1, wherein, the certain pressure situation in the described second channel (7) is above the pressure in the second channel (7) and the situation of the limit difference between first reference pressure.

3. control system as claimed in claim 2, wherein, described first reference pressure depends on the pressure in the first passage (3).

4. as each described control system in the above-mentioned claim, wherein, the certain pressure situation in the described emergency access (15) is above the pressure in the emergency access (15) and the situation of the limit difference between second reference pressure.

5. control system as claimed in claim 4, wherein, described second reference pressure depends on the pressure in the return flow line (17,18,19).

6. as each described control system among the above-mentioned claim 1-3, wherein, described first control valve unit (11) is suitable for further preventing that fluid from flowing to second connecting port (8) from second control port (9), unless have the certain pressure situation in the first passage (3).

7. control system as claimed in claim 6, wherein, the certain pressure situation in the described first passage (3) is above the pressure in the first passage (3) and the situation of the limit difference between the 3rd reference pressure.

8. control system as claimed in claim 7, wherein, described the 3rd reference pressure depends on the pressure in the second channel (7).

9. as each described control system among the above-mentioned claim 1-3, wherein, prevent from first and second passages (3,7), to occur fluid and flow, unless in emergency access (15), have the certain pressure situation.

10. control system as claimed in claim 9, wherein, the certain pressure situation in the described emergency access (15) is above the pressure in the emergency access (15) and the situation of the limit difference between the 4th reference pressure.

11. control system as claimed in claim 10, wherein, described the 4th reference pressure one of depends in the first and second connecting ports (4,8) pressure of locating at least.

12. as each described control system among the above-mentioned claim 1-3, wherein, prevent to produce mobile along towards the direction of second control port (9) at described flow passage (18) with in additional flow path (17).

13., comprise second control valve unit (37,38 as each described control system among the above-mentioned claim 1-3,39), if in emergency access (15), have the certain pressure situation, described second control valve unit (37,38,39) be used for preventing that the fluid of second channel (7) from flowing.

14. control system as claimed in claim 13, wherein, the certain pressure situation in the described emergency access (15) is to surpass the situation that pressure in the emergency access (15) and Wucan are examined the limit difference between the pressure.

15. control system as claimed in claim 14, wherein, described Wucan is examined pressure and is depended on pressure in the second channel (7).

16. a hydraulic system comprises:

Pressure fluid source (P);

Be used to collect the storage tank (T) of reflux fluid;

Be suitable for carrying out on object according to pressure fluid flow the apply device (2) of work, apply device comprises first port (6) and second port (10), and fluid is received in port (6,10) one of, and fluid another from port (6,10) returns

Hydraulic control system (1), comprise the first passage (3) that is positioned between first connecting port (4) and first control port (5), be positioned at the second channel (7) between second connecting port (8) and second control port (9), be positioned at the emergency access (15) between emergency entrance (16) and first control port (5), be formed on the return flow line (17 of the flow passage (18) between second control port (9) and second connecting port (8), 18,19), control valve unit (11), and emergency valve device (20), control valve unit (11) is suitable for preventing that fluid from flowing to first connecting port (4) from first control port (5), unless in second channel (7), have the certain pressure situation, and emergency valve device (20) is suitable for preventing return flow line (17,18,19) fluid in flows, unless in emergency access (15), have the certain pressure situation, it is characterized in that, described return flow line (17,18,19) form the additional flow path (17) that second control port (9) is connected with first connecting port (4).

17. hydraulic system as claimed in claim 16 also comprises the pipe-line system with first pipeline (27) and second pipeline (28), this pipe-line system can move between following configuration:

First configuration, wherein first pipeline (27) makes first connecting port (4) be connected with pressure fluid source (P), and second pipeline (28) makes second connecting port (8) be connected with storage tank (T); And

Second configuration, wherein first pipeline (27) makes first connecting port (4) be connected with storage tank (T), and second pipeline (28) makes second connecting port (8) be connected with pressure fluid source (P).

18. as claim 16 or 17 described hydraulic systems, wherein, described pipe-line system is suitable for the 3rd configuration, wherein first and second connecting ports (4,8) both be connected on the storage tank (T).

19., also comprise the emergency pressure fluid source (eP) that separates with pressure fluid source (P) as claim 16 or 17 described hydraulic systems.

20., also comprise the urgent pipeline (30) that emergency entrance (16) is connected with pressure fluid source as claim 16 or 17 described hydraulic systems.

21. hydraulic system as claimed in claim 20, wherein, the cross-section area of described urgent pipeline (30) is in the 1.5-2.5 times of scope of cross section of one of first and second connecting tubes (27,28).

22. hydraulic system as claimed in claim 21, wherein, described first and second pipelines (27,28) have equal cross-section area.

23. actuator (2,34), be included in inflow or flow out first and second ports (6,10) under the fluid effect between first and second limit positions element movably, this actuator comprises control system (1), it comprises the first passage (3) that is positioned between first connecting port (4) and first control port (5), be positioned at the second channel (7) between second connecting port (8) and second control port (9), be positioned at the emergency access (15) between emergency entrance (16) and second control port (9), be formed on the return flow line (17 of the flow passage (18) between second control port (9) and second connecting port (8), 18,19), control valve unit (11), and emergency valve device (20), control valve unit (11) is suitable for preventing that fluid from flowing to first connecting port (4) from first control port (5), unless there is the certain pressure situation in second channel in (7), emergency valve device (20) is suitable for preventing return flow line (17,18,19) fluid in flows, unless there is the certain pressure situation in emergency access in (15), wherein first port (6) is connected on first control port (5), second port (10) is connected on second control port (9), it is characterized in that, return flow line (17,18,19) form the additional flow path (17) that second control port (9) is connected with first connecting port (4).

24. one kind is used to control the valve that fluid flows, this valve comprises the valve member (35) that is arranged in flow channel (36) and can moves between two limit positions of the different flow resistances that flow channel is provided, valve member can pass through actuator (2,34) move, actuator is included in inflow or flows out first and second ports (6,10) element that fluid effect can be moved between first and second limit positions down, actuator comprises control system (1), control system comprises the first passage (3) that is positioned between first connecting port (4) and first control port (5), be positioned at the second channel (7) between second connecting port (8) and second control port (9), be positioned at the emergency access (15) between emergency entrance (16) and first control port (5), be formed on the return flow line (17 of the flow passage (18) between second control port (9) and second connecting port (8), 18,19), control valve unit (11), and emergency valve device (20), control valve unit (11) is suitable for preventing that fluid from flowing to first connecting port (4) from first control port (5), unless there is the certain pressure situation in second channel in (7), and emergency valve device (20) is suitable for preventing return flow line (17,18,19) Nei fluid flows, unless there is the certain pressure situation in emergency access in (15), wherein first port (6) is connected on first control port (5), second port (10) is connected on second control port (9), it is characterized in that, return flow line (17,18,19) form the additional flow path (17) that second control port (9) is connected with first connecting port (4).

25. valve as claimed in claim 24, wherein, described valve member (35) can pass through 1/4th of valve member (35) and change mobile between two limit positions.

26. the method for an operating valve system, this valve system comprises can be according to the mobile valve that opens or closes of fluid, under the normal operations situation, provide towards the fluid forward of valve stream to preceding pipeline, reflux line away from the stream of fluid backward of valve is provided under the normal operations situation, and under the limit operation situation, provide urgent pipeline towards the urgent fluid stream of valve, described method also comprises and prevents backward the step that flows, flow unless exist forward, and prevent the urgent step that flows backward, unless there be urgent flowing, described method is included in the step of interrupting the stream of fluid forward under the limit case, and is providing step away from the urgent stream of fluid backward of valve forward with in the reflux line.