EP2372167A1 - A device for controlling a piloting pressure, in particular of a balance valve. - Google Patents

A device for controlling a piloting pressure, in particular of a balance valve. Download PDF

Info

Publication number
EP2372167A1
EP2372167A1 EP20100425101 EP10425101A EP2372167A1 EP 2372167 A1 EP2372167 A1 EP 2372167A1 EP 20100425101 EP20100425101 EP 20100425101 EP 10425101 A EP10425101 A EP 10425101A EP 2372167 A1 EP2372167 A1 EP 2372167A1
Authority
EP
European Patent Office
Prior art keywords
opening
valve
obturator
piloting
pressure
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.)
Granted
Application number
EP20100425101
Other languages
German (de)
French (fr)
Other versions
EP2372167B1 (en
Inventor
Andrea Storci
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth Oil Control SpA
Original Assignee
Bosch Rexroth Oil Control SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Rexroth Oil Control SpA filed Critical Bosch Rexroth Oil Control SpA
Priority to EP20100425101 priority Critical patent/EP2372167B1/en
Publication of EP2372167A1 publication Critical patent/EP2372167A1/en
Application granted granted Critical
Publication of EP2372167B1 publication Critical patent/EP2372167B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01Locking-valves or other detent i.e. load-holding devices
    • F15B13/015Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003Systems with load-holding valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30505Non-return valves, i.e. check valves
    • F15B2211/30515Load holding valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/505Pressure control characterised by the type of pressure control means
    • F15B2211/50509Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure

Abstract

The device for controlling a piloting pressure comprises: a choke (8), predisposed to be interposed between a piloting fluid source and an organ (16) activatable by the piloting fluid; a valve (2), arranged in parallel to the choke (8), which valve (2) is normally open and is predisposed to close when the piloting fluid pressure reaches a determined value; the valve (2) being a pressure reducer valve provided with an obturator (21).

Description

  • The invention relates to a device for controlling a piloting pressure, in particular the piloting pressure of a balance valve.
  • The prior art contains hydraulic activating circuits for hydraulic actuators, for example for a cylinder of an arm of a lifting apparatus, in which a first circuit branch connects a hydraulic distributor, in turn associated to a pump, with the chamber of the actuator being associated to the lifting of the load and a second branch connects the distributor with the chamber associated to the descent of the load. The circuit is provided with a balance valve predisposed for controlling the fluid flow along the first branch during the descent stage of the load. A piloting conduit removes a piloting pressure from the second branch which piloting pressure acts by opening the balance valve during the descent stage of the load.
  • In a circuit of this type instability and oscilation phenomena occur in the balance valve on activation of the cylinder for the descent of the load or the inversion of motion thereof. In particular, on lowering the load there can be a frequent succession of blocks and free-ups of the actuator before stabilisation occurs, which causes dangerous oscillation of the load.
  • To resolve the problem chokes have been placed on the piloting conduit. These chokes determine a localised load loss by effect of which the increase in the piloting pressure PPIL commanding the opening of the balance valve is gradual and controlled with respect to the increase in pressure PB in the second branch (i.e. the branch which during the lowering stage of the load is the delivery branch). In the diagram of figure 1 the curve S approximately represents the progress of the piloting pressure PPIL as a function of the pressure PB in the second branch using a choke.
  • A drawback of the above-cited known solution is the delay in the activation of the cylinder with respect to the operator's command, especially evident when the operating liquid in the hydraulic circuit is very viscous (for example when cold). This delay is due to the presence of the choke and can be schematised in figure 1 by observing that the piloting pressure PPIL reaches value PV of opening of the balance valve (a value predetermined by the calibration of the valve spring) when the delivery pressure PB to the cylinder has already reached a relatively high level PS. This means that the activation of the cylinder during the lowering stage starts from the moment in which the pressure PB reaches the value PS. The time required for the pressure PB to reached value PS (to which value PV of the piloting pressure PPIL corresponds) can be relatively high, which determines the mentioned delay.
  • In patent EP 1178219 the present Applicant provided a satisfactory solution to the technical problem described above. In that solution, a check valve is located along the piloting conduit, in parallel with the choke. The valve, normally open, enables passage of the piloting fluid up to reaching a determined pressure downstream of the valve. On reaching the determined pressure, the valve closes and the piloting fluid flow continues via the choke. The presence of the check valve, located in parallel with the choke, enables a rapid increase of the piloting pressure in the first stages of sending the piloting signal to the balance valve. In this way, the lowering of the load begins promptly in response to the lowering command.
  • The above-described solution exhibits however a not entirely satisfactory aspect. The check valve exhibits a certain tendency to closure following pressure peaks or flow peaks along the piloting conduit. As these pressure or flow peaks are rather frequent, so are the closures of the check valve, which undesirably slow down the opening of the balance valve.
  • The aim of the present invention is to realise a device for control of a piloting pressure of a balance valve which enables reduction of the delay in response of the balance valve or, more in general, of a hydraulically-piloted organ.
  • An advantage of the invention is that is provides a device which enables prompt and progressive activation of the piloted organ.
  • A further advantage of the invention is to considerably reduce the delay in opening of the balance valve in an activating circuit for a hydraulic actuator and to prevent onset of instability and oscillation phenomena of the valve. Further characteristics and advantages of the present invention will more fully emerge from the detailed description that follows of some preferred though not exclusive embodiments, which are illustrated purely by way of example in the accompanying figures of the drawings, in which:
    • figure 1 is a diagram indicating the piloting pressure PPIL according to the pressure PB in the delivery conduit during the lowering stage of the load, respectively for a known valve (curve S) and for a valve made according to the invention (curve T);
    • figure 2 is a schematic illustration of an embodiment of the invention, combined to an activating circuit for a hydraulic actuator, wherein a pressure reducer valve is in an open configuration;
    • figure 3 shows the device of figure 2 in which the pressure reducer valve is in a closed configuration;
    • figures 4 and 5 show a variant of the device illustrated in figures 2 and 3, wherein the pressure reduction valve is respectively in an open and closed configuration.
    • Figure 2 illustrates an activating circuit for a hydraulic actuator 9 which, merely by way of example, is constituted by a cylinder.
  • The hydraulic actuator 9 has a first chamber 10 and a second chamber 11 respectively associated to the raising and lowering of a load 12.
  • The activating circuit comprises a hydraulic distributor 13 in turn connected to a source of operating fluid under pressure, typically a pump. A first branch 14 connects the distributor 13 with the first chamber 10, while a second branch 15 connects the distributor 13 with the second chamber 11. A balance valve 16 is arranged along the first branch 14 to regulate the flow rate of operating fluid which unloads from the first chamber 10 during the descent stage of the load 12. A piloting conduit 17 takes from the second branch 15 a piloting pressure which acts to open the flow rate control valve 16.
  • The balance valve 16, of known type, exhibits a first connection which is connected to the first chamber 10 and a second connection connected to the distributor 13. The balance valve has a obturator which is mobile between the open position, in which the first connection is set in communication with the second connection, and a closed position, wherein the first and the second connections are not in communication with one another. The obturator of the balance valve 16 is pushed towards the closed position thereof by means of a spring, while it is pushed towards its open position by the force exerted thereon by the pressure exerted by the piloting fluid removed from the second branch 15. The balance valve comprises a single-acting valve connected in parallel to the obturator for enabling free flow of the piloting fluid from the second to the first connection.
  • The function of the balance valve 16 is to enable, during raising of the load, free flow of the operating liquid 13 to the first chamber 10 of the actuator 9. During the descent of the load, the balance valve 16 controls and limits the flow rate of the operating fluid which unloads from the first chamber 10 towards the distributor 13, such as to slow down the descent of the load. The device of the present invention, illustrated in figure 2, is predisposed to be positioned along the piloting conduit 17. It comprises a choke 8, predisposed to be interposed between a piloting fluid source and an organ 16, in particular the balance valve 16, which is activatable by the piloting fluid. The device further comprises a pressure reducer valve 2, arranged in parallel with the choke 8, which is normally open and is predisposed to close when the piloting fluid pressure reaches a determined level.
  • The reducer valve 2 is provided with an obturator 21 which is mobile between an open position, in which the piloting fluid flow is enabled through the reducer valve 2, and a closed position, in which the piloting fluid flow is not enabled through the reducer valve 2. The obturator 21 is pushed towards the open position thereof by effect of the thrust exerted by an elastic element 25, while it is pushed towards the closed position thereof by effect of the thrust exerted by the piloting fluid pressure on a thrust surface 210 of the obturator 21. The thrust surface 210 is defined by the front section of the obturator 21, i.e. by the area of the circle delimited by the external edge of the obturator 21.
  • The obturator 21 is advantageously conformed and arranged such that the thrust surface 210 is not exposed to the direct flow of the piloting liquid in inlet to the reducer valve 2. The thrust surface 210 is exposed directly only to the piloting fluid pressure downstream of the reducer valve 2.
  • The conformation of the obturator 21 and the arrangement of the thrust surface 210 are such that any peaks of flow rate and/or pressure of the piloting fluid in inlet to the reducer valve 2 do not have the effect of nudging the obturator 21 towards the closed position. The obturator 21 is only subject to the effect of the pressure present downstream of the reducer valve 2, which pressure also acts on the balance valve 16. In this way any peaks of flow rate and/or pressure of the piloting fluid in inlet to the reducer valve 2, as they do not nudge the obturator 21 to closure, do not slow down the flow of the piloting fluid towards the balance valve 16.
  • The obturator 21 is sealedly slidable along a longitudinal axis x internally of a seating 22. The seating 22 exhibits at least an inlet opening 23, predisposed to be connected to the piloting conduit 17, and at least an outlet opening 24 predisposed to be connected to the balance valve 16. The obturator 21 is mobile between at least an open position (figure 2), in which the inlet opening 23 and the outlet opening 24 are in communication and the piloting fluid can flow from the inlet opening to the outlet opening, and at least a closed position (figure 3), in which communication between the inlet opening and the outlet opening is prevented. An elastic element 25, preferably a helical spring possible provided with a calibrating organ 26 is predisposed to push the obturator 21 towards the open position. Differently, the pressure downstream of the outlet opening 24, which unloads on the thrust surface 210, pushes the obturator 21 towards the closed position.
  • The obturator 21 exhibits a communicating conduit 211 arranged longitudinally and parallel to the sliding direction of the obturator 21. The communicating conduit 211 is provided with a first opening 212 and a second opening 213.
  • The second opening 213 is set in communication with the outlet opening 24 of the reducer valve 2. The first opening 212, in the open position of the obturator 21, is in communication with the inlet opening 23 of the reducer valve 2, such that the inlet opening 23 is in communication with the outlet opening 24 via the first opening 212, the communicating conduit 211 and the second opening 213. In the closed position of the obturator 21, the first opening 212 is not in communication with the inlet opening 23 of the reducer valve 2. To this end, the first opening 212 is arranged at an annular groove 214 located on the lateral surface of the obturator 21. The annular groove 214 delimits, in cooperation with the internal wall of the seating 22, an annular chamber into which the first opening 212 opens.
  • In the open position of the obturator 21, the annular chamber at least partly faces the inlet opening 23 of the reducer valve 2, while in the closed position of the obturator 21 the annular chamber is not in communication with the inlet opening 23. The first opening 212 develops perpendicular to the communicating conduit 211, such that the piloting fluid coming from the inlet opening 23 of the reducer valve 2 flows internally of the communicating conduit 211 from a transversal direction with respect to the longitudinal development of the communicating conduit 211. In this way, the dynamic effect due to the flow of the piloting fluid in inlet to the communicating conduit 211 is directed perpendicular to the sliding direction of the obturator 21, and the obturator 21 is therefore not pushed to slide.
  • The inlet opening 23 and the first opening 212 are substantially facing in the same direction. The outlet opening 24 and the second opening 213 are reciprocally aligned. The directions of orientation of the inlet opening and the first opening are in turn perpendicular to the orientation direction of the outlet opening and the second opening.
  • As already mentioned herein above, the special conformation of the obturator 21 is such that the obturator 21 does not suffer from any pressure or flow rate peaks on opening the inlet 23 of the reducer valve 2. The displacement of the obturator 21 towards the closed position is determined only by the pressure present at the outlet opening 24 of the reducer valve 2. In this way, the reducer valve 2 does not perform undesired and unexpected closures, but closes only when the pressure present at the outlet opening 24 reaches a determined value, in particular a value determined by the force exerted by the elastic element 25.
  • The elastic element 25 or spring is housed in a low-pressure chamber 27. In particular the chamber 27 of the spring 25 is set in communication with the first branch 14 of the circuit connecting the distributor 13 with the first chamber 10 of the actuator 9, which chamber 10 is associated to the raising of the load. During the stages of supporting and lowering the load, this branch is normally at low pressure, and the spring chamber of the reducer valve is also at low pressure. The eventual presence of pressure in the chamber 27 would raise the calibration value of the reducer valve 2, i.e. the pressure required for determining the displacement of the obturator 21 towards the closed position. This might effectively occur by effect of a pressurised oil flow present in the first branch 14 of the circuit during the descent. In this condition the calibration of the reducer valve 2, i.e. the pressure required for displacing the obturator 21 towards the closed position, would increase slightly and, consequently, the pressure transmitted to the piloting of the balance valve would also increase, in this way facilitating the opening of the valve. Alternatively to the connection with the first branch 14, the chamber 27 containing the spring 25 might also be ventilated by air.
  • A single-acting valve 3 can be interposed between the reducer valve 2 and the balance valve 16, which single-acting valve 3 has a function of enabling flow of the fluid only from the reducer valve 2 towards the piloting of the balance valve 16, while reverse flow is prevented. In this way all unexpected back-flow of the piloting fluid in outlet from the piloting of the balance valve 16 is prevented. This unexpected flow might obtain in a case of a pressure drop in the second branch 15 of the circuit, and might lead to an undesired closing of the balance valve 16.
  • The functioning of the reducer valve 2 and the activating circuit of the hydraulic actuator 9 are as follows.
  • On starting the load lowering stage, i.e. when the distributor 13 is brought into a configuration in which the operating fluid is sent to the second chamber 11 of the actuator 9 through the second branch 15, the pressure PB is in the second branch 15 is raised, and therefore also in the piloting conduit 17. The piloting pressure PPIL on connection of piloting of the balance valve 16 reaches the predetermined value for the opening of the valve in a relatively brief time. This pressure increases rapidly up to the predetermined calibrated pressure of the reducer valve 2, which is normally open. On reaching the predetermined calibrated pressure PX of the reducer valve 2, the obturator 21 displaces into the closed position and the piloting fluid flow proceeds through the choke 8, such that the piloting pressure PPIL further increases through the choke up to reaching the value PV at which the balance valve 16 opens. Thereafter, on closure of the reducer valve 2, the piloting pressure PPIL increases from value PX to value PV at a smaller inclination with respect to a situation in which the reducer valve 2 is open, as shown by the curve T of figure 1. This smaller inclination depends on the pressure drop caused by the choke 8.
  • The curve S of figure 1 denotes the progress of the piloting pressure PPIL for a control device comprising only the choke 8 but not the reducer valve 2. The curve S clearly shows how the piloting pressure PPIL reaches the start value PV of the opening of the balance valve 16 when the pressure PB in the second branch 15 is at a decidedly greater value than the curve T. This means that, thanks to the device of the invention, the balance valve 16 opens decidedly before, such that the lowering of the load follows very rapidly on from the operator's descent command.
  • It has further been observed that the choke 8, which has the task of stabilising the functioning of the actuator 9 during the descent stage of the load, effectively performs this task even where the passage section is relatively large. In particular, the choke 8 of the device of the invention can be decidedly more open with respect to a stabilising choke in a device lacking the reducer valve 2. Consequently it can be seen from figure 1 that the inclination of the curve S, relative to a more accentuated choke, is less than the inclination of the second tract of the curve T, which relates to the choke used in the present device, in which PPIL is greater than PX. This enables the operator to have an even more direct and immediate control of the actuator 9, as the response of the actuator 9 is even more prompt for each positional variation of the distributor 13.
  • During the descent manoeuvre it can happen that the load has to be sharply halted, either by a command of the operator or following an eventual fault or breakage of a tube. In order to enable rapid halting, the balance valve 16, the obturator of which has been piloted, i.e. pushed, into the open position by the piloting fluid, has to return to the closed position, sending at least a part of the piloting fluid in discharge.
  • For closure of the balance valve 16, the piloting fluid can be discharged only passing through the choke 8, due to the presence of the single-acting valve 3. This might cause an undesired delay in the closure of the obturator of the balance valve 16, and therefore an excessive delay in the halting of the load.
  • To obviate this delay, the device of the present invention, as illustrated in figures 4 and 5, can advantageously be provided with a pressure limiter valve 4 arranged in parallel with the choke 8 and the reducer valve 2. The limiter valve is provided with an obturator which is mobile between an open position, in which the operating fluid flow through the valve is enabled, and a closed position, in which the flow is not enabled. The obturator is pushed towards the closed position by effect of the thrust exerted by an elastic means, while it is pushed towards the open position by the piloting fluid pressure. The limiter valve 4 enables the piloting fluid flow only from the balance valve 16 to the second branch 15, while it prevents the reverse flow, and enables flow only if the piloting fluid pressure rises above a determined value corresponding to the thrust exerted by the elastic means. At least a part of the piloting fluid can be rapidly discharge through the limiter valve 4, such as to enable the obturator of the balance valve 16 to displace rapidly towards the closed position thereof, at least for a considerable part of the run towards the closed position. Although the above description relates to the use of the device in combination with a balance valve, the device of the invention can be used for controlling the piloting pressure towards any hydraulically-piloted organ, with the aim of having a very rapid start-up of the piloted organ in response to an external command supplied via the piloting pressure supply. The device obviates delays in start-up of the hydraulically-piloted organ while at the same time preventing instability phenomena in the functioning of the piloted organ after start-up.

Claims (14)

  1. A device for controlling a piloting pressure, comprising: a choke (8), predisposed to be interposed between a piloting fluid source and an organ (16) activatable by the piloting fluid; a valve (2), arranged in parallel to the choke (8), which valve (2) is normally open and is predisposed to close when the piloting fluid pressure reaches a determined value; characterised in that the valve (2) is a pressure reducer valve provided with an obturator (21).
  2. The device of claim 1, wherein the obturator (21) is mobile between an open position, in which a piloting fluid flow is enabled through the reducer valve (2), and a closed position, in which the piloting fluid flow is not enabled through the reducer valve (2), the obturator being pushed towards the open position thereof by effect of a thrust exerted by an elastic element (25), the obturator being pushed towards the closed position thereof by effect of the thrust exerted by the piloting fluid pressure on a thrust surface (210) of the obturator (21).
  3. The device of claim 2, wherein the obturator (21) is conformed and arranged such that the thrust surface (210) is not exposed to a direct flow of the piloting fluid in inlet to the reducer valve (2).
  4. The device of claims 2 or 3, wherein the thrust surface (210) is directly exposed to the direct flow of the piloting fluid in inlet to the reducer valve (2).
  5. The device of one of the preceding claims, wherein the obturator (21) is sealedly slidable along a seating (22) which exhibits at least an inlet opening (23) predisposed to receive the piloting fluid, and at least an outlet opening (24), through which the piloting fluid can be sent to the organ (16).
  6. The device of claim 5, wherein the obturator (21) is mobile between at least an open position, in which the inlet opening (23) and the outlet opening (24) are in mutual communication and the piloting fluid can flow from the inlet opening to the outlet opening, and at least a closed position, in which the communication between the inlet opening and the outlet opening is prevented.
  7. The device of claim 6, wherein: the obturator (21) exhibits a communicating conduit (211) provided with a first opening (212) and a second opening (213); the second opening (213) is set in communication with the outlet opening (24) of the reducer valve (2); the first opening (212), in the open position of the obturator (21), is in communication with the inlet opening (23), such that the inlet opening (23) is in communication with the outlet opening (24) via the first opening (212), the communicating conduit (211) and the second opening (213); in the closed position of the obturator (21), the first opening (212) is not in communication with the inlet opening (23).
  8. The device of claim 7, wherein: the inlet opening (23) and the first opening (212) substantially face in a same direction; the outlet opening (24) and the second opening (213) are aligned to one another; the orientation direction of the inlet opening (23) and the first opening (212) are perpendicular to the alignment direction of the outlet opening (24) and the second opening (213).
  9. The device of claim 8, wherein: the first opening (212) is arranged at an annular channel (214), afforded on the lateral surface of the obturator (21), which delimits, in cooperation with the internal wall of the seating (22), an annular chamber in which the first opening (212) opens; in the open position of the obturator (21), the annular chamber at least partly faces the inlet opening (23); in the closure position of the obturator (21) the annular chamber is not in communication with the inlet opening (23).
  10. The device of one of claims from 2 to 9, wherein the elastic element or spring (25) is housed in a low-pressure chamber (27).
  11. The device of claim 10, wherein the chamber (27) of the elastic element (25) is open to air.
  12. The device of one of the preceding claims, comprising a single-acting valve (3) arranged downstream of the reducer valve (2), which is predisposed to enable flow of the piloting fluid from the reducer valve (2) towards the organ to be piloted (16) and to prevent a reverse flow.
  13. The device of one of the preceding claims, comprising a pressure limiter valve (4), arranged in parallel to the choke (8) and to the reducer valve (2), which is predisposed to enable the piloting fluid flow in discharge from the organ (16) and to prevent a reverse flow.
  14. An activating circuit for a hydraulic actuator (9), comprising: a hydraulic cylinder (13); a first branch (14) predisposed to connect the distributor (13) with a first chamber (10) of the hydraulic actuator (9); a second branch (15) predisposed to connect the distributor (13) with a second chamber (11) of the hydraulic actuator (9); a balance valve (16), arranged along the first branch (14) in order to regulate the operating fluid flow in outlet from the first chamber (10) during a lowering stage of the load (12); a choke (8) interposed between the second branch (15) and the balance valve (16); characterised in that it comprises a device for controlling the piloting pressure as in one of the preceding claims, arranged in parallel to the choke (8) between the second branch (15) and the balance valve (16).
EP20100425101 2010-03-30 2010-03-30 A device for controlling a piloting pressure, in particular of a balance valve. Expired - Fee Related EP2372167B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100425101 EP2372167B1 (en) 2010-03-30 2010-03-30 A device for controlling a piloting pressure, in particular of a balance valve.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100425101 EP2372167B1 (en) 2010-03-30 2010-03-30 A device for controlling a piloting pressure, in particular of a balance valve.

Publications (2)

Publication Number Publication Date
EP2372167A1 true EP2372167A1 (en) 2011-10-05
EP2372167B1 EP2372167B1 (en) 2012-11-14

Family

ID=42676871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100425101 Expired - Fee Related EP2372167B1 (en) 2010-03-30 2010-03-30 A device for controlling a piloting pressure, in particular of a balance valve.

Country Status (1)

Country Link
EP (1) EP2372167B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486105A (en) * 2013-10-14 2014-01-01 徐州重型机械有限公司 Control device for pilot spool
CN103982482A (en) * 2014-05-30 2014-08-13 徐州重型机械有限公司 Crane, telescopic arm control system of crane and balance valve
EP2786958A1 (en) * 2013-04-05 2014-10-08 Bosch Rexroth Oil Control S.p.A. Control device for the descent of a load
CN108661971A (en) * 2018-08-22 2018-10-16 佛山信卓派思机械科技有限公司 A kind of load-transducing type flow control balanced valve
CN108953713A (en) * 2018-08-22 2018-12-07 东莞海特帕沃液压科技有限公司 Flow type balanced valve
CN109099023A (en) * 2018-09-29 2018-12-28 邵延荣 Balanced valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106050784B (en) * 2016-08-14 2017-10-03 宁波市博尔法液压有限公司 A kind of balanced valve
CN110360174B (en) * 2019-06-14 2020-07-31 常德中联重科液压有限公司 Valve body, valve rod assembly, balance valve and hydraulic cylinder telescopic control loop of balance valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5916022A (en) * 1982-07-16 1984-01-27 Uchida Yuatsu Kiki Kogyo Kk Backlash removing circuit device
US4523430A (en) * 1981-03-19 1985-06-18 Daikin Kogyo Co., Ltd. Fluid flow control system
DE9412531U1 (en) * 1994-08-03 1994-09-29 Heilmeier & Weinlein Hydraulic control device
DE9412530U1 (en) * 1994-08-03 1994-11-10 Heilmeier & Weinlein Hydraulic damping device
EP1178219A1 (en) 2000-08-04 2002-02-06 OIL CONTROL S.p.A. A hydraulic device for controlling a piloting pressure
US20080302428A1 (en) * 2007-06-07 2008-12-11 Kaoru Nomichi Pressure-reducing valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523430A (en) * 1981-03-19 1985-06-18 Daikin Kogyo Co., Ltd. Fluid flow control system
JPS5916022A (en) * 1982-07-16 1984-01-27 Uchida Yuatsu Kiki Kogyo Kk Backlash removing circuit device
DE9412531U1 (en) * 1994-08-03 1994-09-29 Heilmeier & Weinlein Hydraulic control device
DE9412530U1 (en) * 1994-08-03 1994-11-10 Heilmeier & Weinlein Hydraulic damping device
EP1178219A1 (en) 2000-08-04 2002-02-06 OIL CONTROL S.p.A. A hydraulic device for controlling a piloting pressure
EP1178219B1 (en) * 2000-08-04 2005-04-27 OIL CONTROL S.p.A. A hydraulic device for controlling a piloting pressure
US20080302428A1 (en) * 2007-06-07 2008-12-11 Kaoru Nomichi Pressure-reducing valve

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2786958A1 (en) * 2013-04-05 2014-10-08 Bosch Rexroth Oil Control S.p.A. Control device for the descent of a load
CN103486105A (en) * 2013-10-14 2014-01-01 徐州重型机械有限公司 Control device for pilot spool
CN103486105B (en) * 2013-10-14 2016-02-24 徐州重型机械有限公司 A kind of control gear of pilot slide valve
CN103982482A (en) * 2014-05-30 2014-08-13 徐州重型机械有限公司 Crane, telescopic arm control system of crane and balance valve
CN108661971A (en) * 2018-08-22 2018-10-16 佛山信卓派思机械科技有限公司 A kind of load-transducing type flow control balanced valve
CN108953713A (en) * 2018-08-22 2018-12-07 东莞海特帕沃液压科技有限公司 Flow type balanced valve
CN109099023A (en) * 2018-09-29 2018-12-28 邵延荣 Balanced valve
CN109099023B (en) * 2018-09-29 2020-08-21 艾肯(江苏)工业技术有限公司 Balance valve

Also Published As

Publication number Publication date
EP2372167B1 (en) 2012-11-14

Similar Documents

Publication Publication Date Title
KR100764119B1 (en) Pilot poppet type relief valve
KR101226140B1 (en) A support for supporting a structure on a surface
US7234574B2 (en) Damping coefficient switching-type hydraulic damper
US6866485B2 (en) Double-acting hydraulic pressure intensifier
US4959957A (en) Hydraulic actuating unit, in particular for raising a load, such as a hospital bed
CN101858368B (en) Multiple directional control valve system for return oil throttle control with load sensitive pressure compensation
RU2370646C2 (en) Procedure, installation and valve for adjustment of rock drilling
EP3078571B1 (en) Hydraulic steering system
US8424836B2 (en) Bidirectional force feedback poppet valve
EP2786915A1 (en) Hydraulic steering arrangement
US7740224B2 (en) Valve
JP2006242380A (en) Hydraulic control valve system including electronic load detection control device
EP1111229B1 (en) Fuel injection valve for reciprocating internal combustion engine
US8499552B2 (en) Method and hydraulic control system for supplying pressure medium to at least one hydraulic consumer
US20060236981A1 (en) Fuel system
KR20040007595A (en) Mobile working machine
US20130343937A1 (en) Oil pump with selectable outlet pressure
US6802242B1 (en) Pneumatic circuit control system
US20020008425A1 (en) Valve apparatus for controlling hydraulic pressure for a clutch or a brake and method for controlling hydraulic pressure
KR20020080338A (en) Method and device for controlling a lift cylinder, especially of working machines
DE102005019599B4 (en) Control valve device and pressure circuit
JP5106286B2 (en) Improved bypass and pressure regulating valve
US7353744B2 (en) Hydraulic control
JP5103138B2 (en) High pressure liquid supply pump
US20090064676A1 (en) Hydrostatic drive having volumetric flow equalisation

Legal Events

Date Code Title Description
AK Designated contracting states:

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent to

Extension state: AL BA ME RS

17P Request for examination filed

Effective date: 20111028

AK Designated contracting states:

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 584151

Country of ref document: AT

Kind code of ref document: T

Effective date: 20121115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602010003623

Country of ref document: DE

Effective date: 20130110

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20121114

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 584151

Country of ref document: AT

Kind code of ref document: T

Effective date: 20121114

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130214

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130225

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130314

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130215

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130214

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

26N No opposition filed

Effective date: 20130815

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130331

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602010003623

Country of ref document: DE

Effective date: 20130815

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130330

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

PGFP Postgrant: annual fees paid to national office

Ref country code: GB

Payment date: 20140331

Year of fee payment: 5

Ref country code: FR

Payment date: 20140328

Year of fee payment: 5

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140331

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

PGFP Postgrant: annual fees paid to national office

Ref country code: DE

Payment date: 20150601

Year of fee payment: 6

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20100330

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130330

PGFP Postgrant: annual fees paid to national office

Ref country code: IT

Payment date: 20150331

Year of fee payment: 6

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20150330

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20151130

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150330

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150331

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121114

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602010003623

Country of ref document: DE

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161001

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160330