NO328098B1 - Apparatus and method for pressure fluid circulation in actuator system - Google Patents
Apparatus and method for pressure fluid circulation in actuator system Download PDFInfo
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- NO328098B1 NO328098B1 NO20033661A NO20033661A NO328098B1 NO 328098 B1 NO328098 B1 NO 328098B1 NO 20033661 A NO20033661 A NO 20033661A NO 20033661 A NO20033661 A NO 20033661A NO 328098 B1 NO328098 B1 NO 328098B1
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- actuator
- valve
- pressure fluid
- controlled
- active member
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- 239000012530 fluid Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 10
- 210000000056 organ Anatomy 0.000 description 5
- 239000003921 oil Substances 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000007281 self degradation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Anordning og fremgangsmåte ved sirkuleringsventil for en aktuator (1) som forsynes med trykkfluid via en retningsventil (10) og et første forbindelsesrør (A) til et første trykkfluidkammer (4) respektive et andre forbindelsesrør (B) til et andre trykkfluidkammer (8), idet tilførsel av trykkfluid til ett av trykkfluidkammerne (4, 8) bevirker at aktuatorens (1) virksomme organ (6) forskyves mot en korresponderende endestilling, og hvor en av det virksomme organ. (6) styrt forbipasseringsventil (12, 14) kommuniserbart er koplet mellom forbindelsesrørene (A, B), idet forbipasseringsventilen (12,14) er innrettet til automatisk å åpne en forbindelse mellom forbindelsesrørene (A, B) når det virksomme organ (6) befinner seg i en bestemt stilling.Device and method for a circulation valve for an actuator (1) which is supplied with pressure fluid via a directional valve (10) and a first connection pipe (A) to a first pressure fluid chamber (4) and a second connection pipe (B) to a second pressure fluid chamber (8), respectively, as the supply of pressurized fluid to one of the pressurized fluid chambers (4, 8) causes the actuator's (1) active member (6) to be displaced towards a corresponding end position, and where one of the active member. (6) controlled bypass valve (12, 14) is communicably connected between the connecting pipes (A, B), the bypass valve (12, 14) being arranged to automatically open a connection between the connecting pipes (A, B) when the active member (6) is in a specific position.
Description
ANORDNING OG FREMGANGSMÅTE FOR TRYKKFLUIDSIRKULERING I AKTUATORSYSTEM DEVICE AND PROCEDURE FOR PRESSURE FLUID CIRCULATION IN ACTUATOR SYSTEM
Denne oppfinnelse vedrører trykkfluidsirkulering i aktuatorsystem. Nærmere bestemt dreier det seg om en hydraulisk sirkuleringsventil som er særlig velegnet for anvendelse i hydraulikkanlegg hvor hydraulikkfluidet er av en slik art at det periodisk må sirkuleres for å unngå nedbrytning. Oppfinnelsen omfatter også en fremgangsmåte for å sirkulere trykkfluidet i aktuatorsystemet. This invention relates to pressurized fluid circulation in an actuator system. More specifically, it is a hydraulic circulation valve which is particularly suitable for use in hydraulic systems where the hydraulic fluid is of such a nature that it must be periodically circulated to avoid breakdown. The invention also includes a method for circulating the pressure fluid in the actuator system.
Ved anvendelse av såkalte miljøoljer i hydraulikkanlegg har det vist seg at oljen, dersom den står stille for eksempel i et rør over en tidsperiode, kan utsettes for selvnedbryting. Under denne prosess dannes det blant annet glukose og sure When using so-called environmental oils in hydraulic systems, it has been shown that if the oil stands still, for example in a pipe over a period of time, it can be exposed to self-degradation. During this process glucose and acids are formed, among other things
reaksjonsmaterialer som kan påføre hydraulikkanlegget skader. reaction materials that can cause damage to the hydraulic system.
Mindre hydraulikkanlegg, for eksempel styreanlegg for ventil-aktuatorer, hvor det er tale om relativt små fluidstrømnings-mengder og kanskje også uregelmessig bruk, har vist seg i særlig grad å være utsatt for skader av denne art. Smaller hydraulic systems, for example control systems for valve actuators, where there are relatively small fluid flow quantities and perhaps also irregular use, have been shown to be particularly susceptible to damage of this kind.
Periodisk igangsetting av aktuatoren er i de fleste tilfeller ikke mulig uten først mekanisk å ha koplet aktuatoren fra sin respektive ventil. For å overkomme dette problem kan det ifølge kjent teknikk anordnes en eller flere overtrykksventi-ler som etter at aktuatoren har inntatt sin ene endestilling, er innrettet til å åpne ved at hydraulikktrykket økes til overtrykksventilens åpnetrykk, hvoretter hydraulikkfluidet sirkuleres utenom aktuatoren. Denne løsning medfører imidler-tid usikkerhet om hvorvidt aktuatoren har nådd sin endestilling før overtrykksventilen åpnet, og løsningen betinger også at det forefinnes et utstyr i tilknytning til ventilen som viser ventilens stilling ved hjelp av enten lokal- eller fj ernavlesing. Periodic activation of the actuator is in most cases not possible without first mechanically disconnecting the actuator from its respective valve. In order to overcome this problem, according to known technology, one or more overpressure valves can be arranged which, after the actuator has assumed its one end position, are arranged to open by increasing the hydraulic pressure to the opening pressure of the overpressure valve, after which the hydraulic fluid is circulated outside the actuator. This solution, however, entails uncertainty as to whether the actuator has reached its end position before the overpressure valve opens, and the solution also requires that there is equipment adjacent to the valve that shows the valve's position using either local or remote reading.
Det er også kjent å forsyne aktuatoren med en manuelt betjent forbipasseringsventil. Tilkomst til aktuatoren kan være vans-kelig og denne fremgangsmåte har derfor fått begrenset anvendelse . It is also known to provide the actuator with a manually operated bypass valve. Access to the actuator can be difficult and this method has therefore had limited use.
WO 82/01226 viser en separat pumpe med tilhørende sirkulasjonsventil som anvendes for sirkulering av væske. Anordningen ifølge WO 82/01226 betinger, foruten en separat pumpe, også et separat røropplegg frem til aktuatoren. WO 82/01226 shows a separate pump with associated circulation valve which is used for circulating liquid. The device according to WO 82/01226 requires, in addition to a separate pump, also a separate piping system up to the actuator.
Oppfinnelsen har til formål å avhjelpe ulempene ved kjent teknikk. The purpose of the invention is to remedy the disadvantages of known technology.
Formålet oppnås i henhold til oppfinnelsen ved de trekk som er angitt i nedenstående beskrivelse og i de etterfølgende patentkrav. The purpose is achieved according to the invention by the features indicated in the description below and in the subsequent patent claims.
Det er tilveiebrakt en sirkulasjonsanordning for en aktuator som forsynes med trykkfluid via en retningsventil og et førs-te forbindelsesrør til et første trykkfluidkammer, respektive et andre forbindelsesrør til et andre trykkammer, idet til-førsel av trykkfluid til ett av trykkfluidkammerne bevirker at aktuatorens virksomme organ forskyves mot en korresponderende endestilling. Sirkulasjonsanordningen kjennetegnes ved at en av det virksomme organ styrt ventil kommuniserbart er koplet mellom forbindelsesrørene nær aktuatoren, idet ventilen er innrettet til automatisk å åpne en forbindelse mellom forbindelsesrørene når det virksomme organ befinner seg i en bestemt posisjon, idet ventilen utgjøres av en første styrt enveisventil og en andre styrt enveisventil, og hvor den første styrte enveisventils åpneport kommuniserer med det andre forbindelsesrør og den andre styrte enveisventils åpneport kommuniserer med det første forbindelsesrør, idet enveisventil enes stengeporter er forbundet ved hjelp av et sir-kulasj onsrør. A circulation device is provided for an actuator which is supplied with pressure fluid via a directional valve and a first connection pipe to a first pressure fluid chamber, respectively a second connection pipe to a second pressure chamber, the supply of pressure fluid to one of the pressure fluid chambers causing the actuator's active organ is shifted towards a corresponding end position. The circulation device is characterized by the fact that a valve controlled by the active organ is communicatively connected between the connecting pipes near the actuator, the valve being arranged to automatically open a connection between the connecting pipes when the active organ is in a specific position, the valve consisting of a first controlled one-way valve and a second controlled one-way valve, and where the first controlled one-way valve's open port communicates with the second connecting pipe and the second controlled one-way valve's open port communicates with the first connecting pipe, the one-way valve's closing ports being connected by means of a circulation pipe.
Ved å forsyne en aktuator med en styrt forbipasseringsventil som er innrettet til, direkte eller indirekte, å betjenes av aktuatoren når aktuatorens virksomme organ befinner seg i en bestemt stilling, vanligvis endestilling, kan det sikres at aktuatorens virksomme organ kommer til sin bestemte stilling før sirkulering av hydraulikkfluid starter. Sirkuleringen skjer i hovedsak uten at særlige tiltak igangsettes og kan intervallmessig foretas uten at aktuatorens virksomme organ forandrer stilling. By providing an actuator with a controlled bypass valve which is arranged to be operated, directly or indirectly, by the actuator when the actuator's operative member is in a specific position, usually the end position, it can be ensured that the actuator's operative member reaches its specific position before circulation of hydraulic fluid starts. The circulation mainly takes place without special measures being initiated and can be carried out at intervals without the actuator's active organ changing position.
I en foretrukket utførelsesform er aktuatoren forsynt med samvirkende forbipasseringsventiler som er innrettet til å In a preferred embodiment, the actuator is provided with cooperating bypass valves which are arranged to
aktiveres i hver av det virksomme organs respektive endestil-linger. Ventilene er som nevnt mekanisk styrte enveisventiler med relativt stort gjennomstrømningsareal. Fjærkraften i den enveisventil som må åpnes av fluidtrykket bidrar til at det virker en større kraft på aktuatorens virksomme organ i retning av den endestilling det virksomme organ befinner seg i, enn i motsatt retning. Dette trekk er nærmere forklart i søk-nadens spesielle del. are activated in each of the active organ's respective end positions. As mentioned, the valves are mechanically controlled one-way valves with a relatively large flow area. The spring force in the one-way valve which must be opened by the fluid pressure contributes to a greater force acting on the actuator's active member in the direction of the end position the active member is in, than in the opposite direction. This feature is explained in more detail in the search-nad's special section.
Anordningen er tilrettelagt for en fremgangsmåte for å sirkulere trykkfluid i et aktuatorsystem hvor en aktuator forsynes med trykkfluid via en retningsventil og et første forbindel-sesrør til et første trykkfluidkammer, respektive et andre forbindelsesrør til et andre trykkfluidkammer, idet tilførsel av hydraulikkfluid til ett av trykkfluidkammerne bevirker at aktuatorens virksomme organ forskyves mot en korresponderende endestilling, og hvor fremgangsmåten kjennetegnes ved at en første styrt enveisventil, hvis åpneport kommuniserer med det andre forbindelsesrør, og hvor de styrte enveisventilers stengeporter som er forbundet ved hjelp av et sirkulasjons-rør, styres av det virksomme organ, idet ventilen, som befinner seg nær aktuatoren, automatisk åpner en forbindelse mellom forbindelsesrørene nær aktuatoren når det virksomme organ befinner seg i en bestemt posisjon. The device is designed for a method of circulating pressure fluid in an actuator system where an actuator is supplied with pressure fluid via a directional valve and a first connection pipe to a first pressure fluid chamber, respectively a second connection pipe to a second pressure fluid chamber, the supply of hydraulic fluid to one of the pressure fluid chambers causes the active member of the actuator to be displaced towards a corresponding end position, and where the method is characterized by a first controlled one-way valve, whose open port communicates with the second connecting pipe, and where the closed ports of the controlled one-way valves, which are connected by means of a circulation pipe, are controlled by the active member, the valve, which is located near the actuator, automatically opens a connection between the connecting pipes near the actuator when the active member is in a certain position.
Nok et fordelaktig trekk ved anordningen og fremgangsmåten ifølge oppfinnelsen er at det ved omstilling av forbipasseringsventilen oppstår en tydelig trykkfallendring i fluid-kretsen. Denne trykkfallendring kan anvendes til å indikere at aktuatorens virksomme organ befinner seg i en bestemt stilling. Another advantageous feature of the device and the method according to the invention is that when the bypass valve is changed, a clear change in pressure drop occurs in the fluid circuit. This pressure drop change can be used to indicate that the actuator's active member is in a specific position.
Oppfinnelsen er velegnet for ethvert fluidanlegg hvor det er behov for sirkulering av fluidet etter en utført arbeidsope-rasjon. I forhold til kjent teknikk oppnås en fjernstyrt ut-sirkulering uten anvendelse av egen sirkulasjonspumpe og røropplegg frem til aktuatoren. The invention is suitable for any fluid system where there is a need for circulation of the fluid after a work operation has been carried out. In relation to known technology, a remotely controlled out-circulation is achieved without the use of a separate circulation pump and piping up to the actuator.
I det etterfølgende beskrives et ikke-begrensende eksempel på en foretrukket utførelsesform som er anskueliggjort på med-følgende tegninger, hvor: Fig. 1 viser et hydraulikkskjerna for en ventilaktuator med styreventil og sirkulasjonsventiler; Fig. 2 viser det samme som i fig. 1, men her befinner ventil-aktuatorens virksomme organ seg i sin ene endestilling, en sirkulasjonsventil er åpen og sirkulasjonen er i gang; og Fig. 3 viser en alternativ utførelsesform hvor også aktuatorens hydraulikkfluidkammer utsirkuleres. In what follows, a non-limiting example of a preferred embodiment is described which is illustrated in the accompanying drawings, where: Fig. 1 shows a hydraulic core for a valve actuator with a control valve and circulation valves; Fig. 2 shows the same as in fig. 1, but here the active member of the valve actuator is in its one end position, a circulation valve is open and circulation is underway; and Fig. 3 shows an alternative embodiment where the actuator's hydraulic fluid chamber is also circulated out.
På tegningene betegner henvisningstallet 1 en aktuator for en ventil 2. Aktuatoren 1 omfatter et første hydraulikkfluidkammer 4, et virksomt organ i form av et stempel 6 og et andre hydraulikkfluidkammer 8 samt andre i og for seg kjente, nød-vendige ikke viste komponenter. In the drawings, the reference number 1 denotes an actuator for a valve 2. The actuator 1 comprises a first hydraulic fluid chamber 4, an active member in the form of a piston 6 and a second hydraulic fluid chamber 8 as well as other per se known, necessary components not shown.
Hydraulikkfluid tilføres under trykk via et tilførselsrør P fra et ikke vist hydraulikkaggregat og til en retningsventil 10. Hydraulikkfluidet returneres fra retningsventilen 10 via en returrør T til det ikke viste hydraulikkaggregat. Hydraulic fluid is supplied under pressure via a supply pipe P from a hydraulic unit not shown and to a directional valve 10. The hydraulic fluid is returned from the directional valve 10 via a return pipe T to the hydraulic unit not shown.
Et første forbindelsesrør A forbinder retningsventilens 10 ene arbeidsport med det første hydraulikkfluidkammer 4. Et andre forbindelsesrør B forbinder retningsventilens 10 andre arbeidsport med det andre hydraulikkfluidkammer 8. A first connecting pipe A connects one working port of the directional valve 10 with the first hydraulic fluid chamber 4. A second connecting pipe B connects the second working port of the directional valve 10 with the second hydraulic fluid chamber 8.
Aktuatoren 1 er forsynt med en første styrt enveisventil 12 som på tegningene av illustrative hensyn er vist som om den betjenes av aktuatorens 1 stempel 6 når stemplet 6 befinner seg nær sin første endestilling. Enveisventilen 12 aktiveres normalt av for eksempel en ikke vist kam på ventilens 2 ikke viste aksling. The actuator 1 is provided with a first controlled one-way valve 12 which is shown in the drawings for illustrative purposes as if it is operated by the actuator 1's piston 6 when the piston 6 is close to its first end position. The one-way valve 12 is normally activated by, for example, a cam (not shown) on the shaft (not shown) of the valve 2.
En andre styrt enveisventil 14 er anordnet slik at den aktiveres når stemplet 6 befinner seg nær sin andre endestilling. A second controlled one-way valve 14 is arranged so that it is activated when the piston 6 is close to its second end position.
Den første styrte enveisventil 12 er i sin gjennomstrømnings-port koplet til det andre forbindelsesrør B og kommuniserer således med det andre hydraulikkfluidkammer 8, se fig. 1. The first controlled one-way valve 12 is connected in its through-flow port to the second connecting pipe B and thus communicates with the second hydraulic fluid chamber 8, see fig. 1.
Den andre styrte enveisventil 14 er i sin gjennomstrømnings-port koplet til det første forbindelsesrør A og kommuniserer således med det første hydraulikkfluidkammer 4. The second controlled one-way valve 14 is connected in its flow-through port to the first connecting pipe A and thus communicates with the first hydraulic fluid chamber 4.
De styrte enveisventiler 12, 14 sine stengporter kommuniserer ved hjelp av et sirkulasjonsrør 16. The closed ports of the controlled one-way valves 12, 14 communicate by means of a circulation pipe 16.
Når retningsventilen 10 forskyves slik at hydraulikkfluid kan da strømme fra tilførselsrøret P og via det første forbindel-sesrør A til det første hydraulikkfluidkammer 4, forskyves stemplet 6 mot sin første endestilling. Hydraulikkfluid kan strømme gjennom den andre enveisventil 14 og sirkulasjons-røret 16, men ikke videre gjennom den første enveisventil 12. When the directional valve 10 is displaced so that hydraulic fluid can then flow from the supply pipe P and via the first connecting pipe A to the first hydraulic fluid chamber 4, the piston 6 is displaced towards its first end position. Hydraulic fluid can flow through the second one-way valve 14 and the circulation pipe 16, but not further through the first one-way valve 12.
Når stemplet 6 er forskjøvet slik at det befinner seg ved sin første endestilling, se fig. 2, aktiveres den første enveisventil 12 slik at hydraulikkfluid kan strømme fra sirkula-sjonsrøret 16, via de andre forbindelsesrør B, retningsventilen 10 og returrøret T til det ikke viste hydraulikkaggregat. When the piston 6 is displaced so that it is at its first end position, see fig. 2, the first one-way valve 12 is activated so that hydraulic fluid can flow from the circulation pipe 16, via the other connecting pipes B, the directional valve 10 and the return pipe T to the not shown hydraulic unit.
Anleggets rør og ventiler kan således utsirkuleres uten at aktuatorens 1 stempel 6 forskyves. The plant's pipes and valves can thus be circulated without displacing the actuator's 1 piston 6.
Ved at hydraulikkfluidet i det første forbindelsesrør A må overvinne bl.a. fjærkraften i den andre enveisventil 14, opp-rettholdes det under sirkuleringen et noe høyere trykk i det første hydraulikkfluidkammer 4 enn i det andre hydraulikkfluidkammer 8. Dette trekk bevirker at stemplet forblir i sin første endestilling. Skulle stemplet 6 forskyves ut av sin første endestilling, vil den første enveisventil lukke, hvor-ved hydraulikkfluidtrykket igjen vil forskyve stemplet 6 mot sin første endestilling. In that the hydraulic fluid in the first connecting pipe A must overcome i.a. the spring force in the second one-way valve 14, a slightly higher pressure is maintained during circulation in the first hydraulic fluid chamber 4 than in the second hydraulic fluid chamber 8. This feature causes the piston to remain in its first end position. Should the piston 6 be displaced from its first end position, the first one-way valve will close, whereby the hydraulic fluid pressure will again displace the piston 6 towards its first end position.
I en alternativ utførelsesform, se fig. 3, er enveisventilene 12, 14 anordnet slik at også aktuatorens 1 hydraulikkfluidkammer 4, 8 utsirkuleres. In an alternative embodiment, see fig. 3, the one-way valves 12, 14 are arranged so that the hydraulic fluid chamber 4, 8 of the actuator 1 is also circulated.
Claims (2)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20033661A NO328098B1 (en) | 2003-08-19 | 2003-08-19 | Apparatus and method for pressure fluid circulation in actuator system |
| CNB2004800231960A CN100404884C (en) | 2003-08-19 | 2004-07-30 | Device and process for circulation of pressurized fluid in an actuator system |
| KR1020067003350A KR101023796B1 (en) | 2003-08-19 | 2004-07-30 | Device and process for circulation of pressurized fluid in an actuator system |
| PCT/NO2004/000232 WO2005017367A1 (en) | 2003-08-19 | 2004-07-30 | Device and process for circulation of pressurized fluid in an actuator system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20033661A NO328098B1 (en) | 2003-08-19 | 2003-08-19 | Apparatus and method for pressure fluid circulation in actuator system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO20033661D0 NO20033661D0 (en) | 2003-08-19 |
| NO20033661L NO20033661L (en) | 2005-02-21 |
| NO328098B1 true NO328098B1 (en) | 2009-12-07 |
Family
ID=28036452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20033661A NO328098B1 (en) | 2003-08-19 | 2003-08-19 | Apparatus and method for pressure fluid circulation in actuator system |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR101023796B1 (en) |
| CN (1) | CN100404884C (en) |
| NO (1) | NO328098B1 (en) |
| WO (1) | WO2005017367A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2095000B (en) * | 1980-09-29 | 1983-12-14 | Catgerpillar Tractor Co | Fluid viscosity control for actuator circuit |
| DE3207080C2 (en) * | 1982-02-26 | 1986-08-21 | Mannesmann Rexroth GmbH, 8770 Lohr | Pilot operated pressure valve |
| JPS58196371A (en) * | 1982-05-11 | 1983-11-15 | Diesel Kiki Co Ltd | Direction change-over valve |
| JP2984091B2 (en) * | 1991-07-02 | 1999-11-29 | カヤバ工業株式会社 | Reverse rotation prevention device for hydraulic motor |
| JPH08193601A (en) * | 1995-01-13 | 1996-07-30 | Ckd Corp | Control circuit and method for cylinder |
| DE19622267C1 (en) * | 1996-06-03 | 1997-12-18 | Sauer Sundstrand Gmbh & Co | Vehicle IC engine control and regulation system for reversible hydraulic displacement pumps with maximum pressure limiting |
| CN1294267A (en) * | 1999-11-01 | 2001-05-09 | 卜劲松 | 3-position 4-way centralizing block for stabilizing hydraulic pressure |
| JP2003097516A (en) * | 2001-09-25 | 2003-04-03 | Hitachi Ltd | Hydraulic device |
-
2003
- 2003-08-19 NO NO20033661A patent/NO328098B1/en not_active IP Right Cessation
-
2004
- 2004-07-30 WO PCT/NO2004/000232 patent/WO2005017367A1/en active Application Filing
- 2004-07-30 CN CNB2004800231960A patent/CN100404884C/en not_active Expired - Fee Related
- 2004-07-30 KR KR1020067003350A patent/KR101023796B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| KR101023796B1 (en) | 2011-03-21 |
| NO20033661L (en) | 2005-02-21 |
| KR20060064656A (en) | 2006-06-13 |
| NO20033661D0 (en) | 2003-08-19 |
| WO2005017367A1 (en) | 2005-02-24 |
| CN1836111A (en) | 2006-09-20 |
| CN100404884C (en) | 2008-07-23 |
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