NO177241B - Electro-hydraulic valve actuator - Google Patents

Electro-hydraulic valve actuator Download PDF

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Publication number
NO177241B
NO177241B NO930753A NO930753A NO177241B NO 177241 B NO177241 B NO 177241B NO 930753 A NO930753 A NO 930753A NO 930753 A NO930753 A NO 930753A NO 177241 B NO177241 B NO 177241B
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Norway
Prior art keywords
valve
actuator
spindle
pressure
accordance
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Application number
NO930753A
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Norwegian (no)
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NO177241C (en
NO930753L (en
NO930753D0 (en
Inventor
Sigbjoern Sangesland
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Sigbjoern Sangesland
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Application filed by Sigbjoern Sangesland filed Critical Sigbjoern Sangesland
Priority to NO930753A priority Critical patent/NO177241C/en
Publication of NO930753D0 publication Critical patent/NO930753D0/en
Priority to GB9403879A priority patent/GB2276209A/en
Publication of NO930753L publication Critical patent/NO930753L/en
Publication of NO177241B publication Critical patent/NO177241B/en
Publication of NO177241C publication Critical patent/NO177241C/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/14—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves
    • F16K31/143—Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves the fluid acting on a piston

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fluid-Driven Valves (AREA)

Description

Foreliggende oppfinnelse vedrører en hermetisk lukket og trykkompensert elektro-hydraulisk ventilaktuator med sviktsikker stengeanordning, i samsvar med den innledende delen av patentkrav 1. Oppfinnelsen er særlig beregnet for anvendelse i forbindelse med styring av ventiler i undervannsproduksjonssystemer, samt brønnsikringsventiler plassert ned i produksjons- eller injeksjonsbrønner. The present invention relates to a hermetically sealed and pressure-compensated electro-hydraulic valve actuator with a fail-safe closing device, in accordance with the introductory part of patent claim 1. The invention is particularly intended for use in connection with the control of valves in underwater production systems, as well as well safety valves placed down in production or injection wells .

Konvensjonelle metoder for styring av undervanns ventiler er basert på hydrauliske løsninger. Det er kjent å føre hydraulisk olje fra ei plattform og til en undervanns-brønn gjennom store kabler som inneholder elektriske ledere og en rekke hydraulikk-rør. Dette utgjør en betydelig kostnad. Det er tidligere foreslått å anvende elektrisk energi for å redusere kostnadene. Conventional methods for controlling underwater valves are based on hydraulic solutions. It is known to carry hydraulic oil from a platform to an underwater well through large cables containing electrical conductors and a number of hydraulic pipes. This represents a significant cost. It has previously been proposed to use electrical energy to reduce costs.

Fra UK-patentskrift 2.198.766 og US-patentskrift 4.920.811 er det kjent anordninger for elektrisk aktivering av ventiler. Disse anordningene har imidlertid vesentlige ulemper, som i hovedsak er knyttet til den sviktsikre stengemekanismen. From UK patent 2,198,766 and US patent 4,920,811 there are known devices for the electrical activation of valves. However, these devices have significant disadvantages, which are mainly linked to the fail-safe closing mechanism.

UK-patentskrift 2.198.766 vedrører en ventilaktuator hvor rotasjonsbevegelsen fra en elektrisk motor omformes til en lineærbevegelse. Ei bladfjær spennes opp under rotasjon av ventilspindelen som åpner ventilen. Ventilen holdes åpen så lenge elektrisk energi tilføres motoren. Når energi-tUførselen forsvinner, drives skruen tilbake vha. fjæra, og ventilen stenges. Anordningen krever betydelig effekt for å holde ventilen åpen. Bladfjærene medfører dessuten stort byggemål og sannsynligvis vil friksjonen mellom de enkelte lag i bladfjærtrommelen medføre redusert pålitelighet for sikker stengning av ventilen. UK patent 2,198,766 relates to a valve actuator where the rotational movement from an electric motor is transformed into a linear movement. A leaf spring is tensioned during rotation of the valve stem which opens the valve. The valve is kept open as long as electrical energy is supplied to the motor. When the energy supply disappears, the screw is driven back using the spring, and the valve closes. The device requires considerable power to keep the valve open. The leaf springs also entail large construction dimensions and the friction between the individual layers in the leaf spring drum will probably result in reduced reliability for safe closing of the valve.

US-patentskrift 4.920.811 vedrører en ventilaktuator hvor det anvendes en mekanisk låseanordning for å holde ventilen i åpen posisjon. Denne låseanord-ningen, som må ta opp et betydelig rotasjonsmoment, vil bli komplisert og vil sannsynligvis ha begrenset pålitelighet. Dessuten vil den kreve en betydelig effekt for å holde ventilen åpen. US patent document 4,920,811 relates to a valve actuator where a mechanical locking device is used to keep the valve in the open position. This locking device, which must take up a significant rotational moment, will become complicated and will probably have limited reliability. Moreover, it will require a significant power to keep the valve open.

US-patentskrift 4.452.422 beskriver en elektrohydraulisk aktuator for regulering av seteventiler anvendt i turbiner. Den kompakte aktuatoren består av en elektrisk motor, hydraulisk pumpe, ventil, hydraulisk sylinder og en akkumulator. Akkumulatoren anvendes for å oppnå stor aktiveringskraft og hastighet. US patent 4,452,422 describes an electrohydraulic actuator for regulating poppet valves used in turbines. The compact actuator consists of an electric motor, hydraulic pump, valve, hydraulic cylinder and an accumulator. The accumulator is used to achieve great activation force and speed.

US-patentskrift 2.746.251 beskriver en kompakt elektro-hydraulisk aktuator som anvender en elektrisk magnetventil for å styre hydraulikkvæske til aktuatoren. Ei spiralfjær, som omgir ventilspindelen, sikrer hurtig stengning av ventilen. US Patent 2,746,251 describes a compact electro-hydraulic actuator that uses an electric solenoid valve to control hydraulic fluid to the actuator. A spiral spring, which surrounds the valve stem, ensures quick closing of the valve.

US-patentskrift 3.675.420 beskriver en elektrohydraulisk rotasjonsaktuator med en elektrisk aktivert sviktsikker stengeanordning. En hydraulisk akkumulator sikrer at ventilen går til stengt eller åpen posisjon når elektrisk energi til magnetventilen opphører. US Patent 3,675,420 describes an electro-hydraulic rotary actuator with an electrically activated fail-safe closing device. A hydraulic accumulator ensures that the valve goes to the closed or open position when electrical energy to the solenoid valve ceases.

FR-patentskrift 2.296.784, 2.229.879 og 2.105.269 beskriver også ulike elektrohydrauliske ventilaktuatorer. Ingen av de ovenfor omtalte eksisterende elektrohydrauliske aktuatorene har en funksjon og virkemåte som kreves for å operere en undervanns-sluseventil med sviktsikker stengeanordning. FR patents 2,296,784, 2,229,879 and 2,105,269 also describe various electro-hydraulic valve actuators. None of the existing electro-hydraulic actuators mentioned above have a function and mode of operation required to operate an underwater sluice valve with a fail-safe closing device.

Generelt sett vil den nødvendige spindelkraften for å åpne en 4-5 tommers sluseventil med et differensialtrykk på 700-1000 bar være i størrelsesorden 700.000 Newton. Generally speaking, the required spindle force to open a 4-5 inch gate valve with a differential pressure of 700-1000 bar will be in the order of 700,000 Newtons.

For å holde ventilen åpen kreves en spindelkraft i størrelsesorden 300.000 N. En slik elektro-mekanisk drevet stengeanordning med høy pålitelighet og lavt effektforbruk er komplisert å utvikle. To keep the valve open, a spindle force of the order of 300,000 N is required. Such an electro-mechanically driven closing device with high reliability and low power consumption is complicated to develop.

Det er derfor et formålet med foreliggende oppfinnelse å framskaffe en elektrisk aktuator som kan styres ved elektriske signaler, og som ikke har ulempene som er tilstede ved dagens teknikk. It is therefore an object of the present invention to provide an electric actuator which can be controlled by electric signals, and which does not have the disadvantages present in current technology.

Oppfinnelsens formål oppnås med en anordning med trekk som angitt i den karakteriserende delen av patentkrav 1. Ytterligere trekk framgår av de tilhørende uselvstendige krav. The purpose of the invention is achieved with a device with features as stated in the characterizing part of patent claim 1. Further features appear from the associated independent claims.

En aktuator i samsvar med oppfinnelsen er forsynt med et innebygget hydraulisk aggregat. En elektrisk motor driver en hydraulikkpumpe som styrer oljestrømmen til et stempel i en sylinder som er koplet til ventilspindelen via en elektrisk operert magnetventil. An actuator in accordance with the invention is provided with a built-in hydraulic unit. An electric motor drives a hydraulic pump which controls the flow of oil to a piston in a cylinder which is connected to the valve stem via an electrically operated solenoid valve.

Når stemplet på ventilspindelen er i endeposisjon stoppes motoren, og en elektrisk magnetventil hindrer returstrøm av olje fra sylinderkammeret så lenge det tilføres elektrisk energi. Sluseventilen er da i åpen tilstand. When the piston on the valve spindle is in the end position, the engine is stopped, and an electric solenoid valve prevents the return flow of oil from the cylinder chamber as long as electrical energy is supplied. The sluice valve is then in the open state.

Når den elektriske energitilførselen opphører, åpner magnetventilen og sluseventilen beveges mot stengt posisjon vha. ei spiralfjær. When the electrical energy supply ceases, the solenoid valve opens and the sluice valve is moved towards the closed position using a spiral spring.

Videre omfatter oppfinnelsen en metallbelg anordning for trykkompensering mot det hydrostatiske vanntrykket samt at en oppnår et hermetisk lukket system. Furthermore, the invention includes a metal bellows device for pressure compensation against the hydrostatic water pressure as well as achieving a hermetically closed system.

Oppfinnelsen skal nå beskrives nærmere ved hjelp av eksempel på utførelse, og under henvisning til vedlagte tegninger, hvor: fig. 1 viser et tverrsnitt av en foretrukket utførelse av en ventilaktuator i samsvar med foreliggende oppfinnelse, i stengt posisjon, og The invention will now be described in more detail with the help of examples of execution, and with reference to the attached drawings, where: fig. 1 shows a cross-section of a preferred embodiment of a valve actuator in accordance with the present invention, in the closed position, and

fig. 2 viser en detalj fra en variant av utførelsen vist i fig. 1. fig. 2 shows a detail from a variant of the embodiment shown in fig. 1.

Ved først å referere til fig. 1 vises en ventil som omfatter et hus 1 og en sluse 3. Slusen 3 styrer strømmen gjennom ventilen, og for å åpne ventilen vil en aktuator måtte skyve slusen 3 nedover slik at et hull i slusen 3 kommer på linje med en utboring i huset 1. Referring first to FIG. 1 shows a valve comprising a housing 1 and a lock 3. The lock 3 controls the flow through the valve, and to open the valve an actuator will have to push the lock 3 downwards so that a hole in the lock 3 aligns with a bore in the housing 1 .

Slusen 3 styres via en spindel 6 av en aktuator, generelt benevnt 30. Aktuatoren 30 og slusen 3 holdes på plass ved en internt gjenget krage 2.Til spindelen 6 er festet et stempel med dynamiske tetninger 13. Den øvre delen av spindelen 6 er omgitt av en metallbelg 11. Det effektive tverrsnittsområdet av belgen 11 er lik tverrsnittsområdet av nedre del av spindelen 6. Dette innebærer at volumet mellom metallbelgen 11 og spindelen 6 er konstant når spindelen 6 går opp og ned. Sammen med en elastomer tetning mellom ventilspindelens nedre del og aktuatorhuset gjør dette at belgens 11 eksponering for omgivelsene (sjøvann og brønnvæske) minimaliseres, samtidig som en oppnår hermetisk tetning mellom omgivelsene og aktuatorens innhold. The lock 3 is controlled via a spindle 6 by an actuator, generally named 30. The actuator 30 and the lock 3 are held in place by an internally threaded collar 2. A piston with dynamic seals 13 is attached to the spindle 6. The upper part of the spindle 6 is surrounded of a metal bellows 11. The effective cross-sectional area of the bellows 11 is equal to the cross-sectional area of the lower part of the spindle 6. This means that the volume between the metal bellows 11 and the spindle 6 is constant when the spindle 6 goes up and down. Together with an elastomeric seal between the lower part of the valve stem and the actuator housing, this means that the bellows 11's exposure to the surroundings (seawater and well fluid) is minimized, while at the same time achieving a hermetic seal between the surroundings and the contents of the actuator.

To fjærer 4, 5 forankrer stemplet for å sikre sviktsikker stenging. En muffe 14 utgjør en stopper for stemplet når stemplet når sin nederste posisjon. Stemplet forskyves ved hydraulisk olje under trykk. Hydraulisk olje tilføres gjennom en tilførselslinje fra ei pumpe 27 som drives av en elektrisk motor 16, og tilhørende reduksjonsgear. Two springs 4, 5 anchor the piston to ensure fail-safe closure. A sleeve 14 forms a stop for the piston when the piston reaches its lowest position. The piston is displaced by hydraulic oil under pressure. Hydraulic oil is supplied through a supply line from a pump 27 which is driven by an electric motor 16, and associated reduction gear.

Pumpa 27 trykksetter tilførselslinja som er koplet til en magnetventil 15 som også inneholder en tilbakeslagsventil. Denne magnetventilen 15 stenger tilførselslinja når den er energisert. Tilførselslinja er også koblet til en trykkbegrenser 12. The pump 27 pressurizes the supply line which is connected to a solenoid valve 15 which also contains a non-return valve. This solenoid valve 15 closes the supply line when it is energized. The supply line is also connected to a pressure limiter 12.

En elektrisk kabel tilfører effekt til magnetventilen 15 og motoren 16 ved hjelp av en elektrisk koplingsenhet 17. An electrical cable supplies power to the solenoid valve 15 and the motor 16 by means of an electrical coupling unit 17.

En lineær variabel differansetransformator 24 er anvendt for å indikere ventilens posisjon. En ytterligere metallbelg 25 anvendes for å utlikne trykket mellom den hydrauliske oljen på innsida av aktuatoren og omgivelsene. A linear variable differential transformer 24 is used to indicate the valve's position. A further metal bellows 25 is used to equalize the pressure between the hydraulic oil on the inside of the actuator and the surroundings.

Trykk-kontrolleringsanordningene (pumpe 27, pumpemotor 16, magnetventil 15 og trykkbegrenser 12) er montert i et sylindrisk hus 20. Dette sylindriske huset 20 kan forskyves aksialt ved en mekanisk ekstern overstyring slik at ventilen kan åpnes i en nødsituasjon. Denne tvangsstyringsakselen har en ytre del 22 med et kvadratisk tverrsnitt, og som kan roteres vha. et verktøy. Den gjengede delen av tvangsstyringsakselen omfatter en kuleskruearrangement og en kulemutter. The pressure control devices (pump 27, pump motor 16, solenoid valve 15 and pressure limiter 12) are mounted in a cylindrical housing 20. This cylindrical housing 20 can be displaced axially by a mechanical external override so that the valve can be opened in an emergency. This forced steering shaft has an outer part 22 with a square cross-section, which can be rotated using a tool. The threaded portion of the forced steering shaft comprises a ball screw assembly and a ball nut.

Ved å dreie på overstyringsakselen blir kulemutteren aksialt forskjøvet når tvangsstyringsakselen forhindres fra aksial bevegelse ved et lager 21. Kulemutteren er fast i det sylindriske huset 20 og derfor vil det sylindriske huset 20 tvinge stemplet nedover for åpning av ventilen. Ved å reversere rotasjonsretningen produsert ved verk-tøyet kan ventilen lukkes idet de sammen trykte fjærene 4, 5 tvinger stemplet til å følge de sylindriske huset 20. By turning the override shaft, the ball nut is displaced axially when the forced steering shaft is prevented from axial movement by a bearing 21. The ball nut is fixed in the cylindrical housing 20 and therefore the cylindrical housing 20 will force the piston downwards to open the valve. By reversing the direction of rotation produced by the tool, the valve can be closed as the compressed springs 4, 5 force the piston to follow the cylindrical housing 20.

Den elektriske motoren 16 startes ved en ytre styringsanordning og driver pumpa 27. Magnetventilen 15 blir energisert og returløpet til oljereservoaret stenges av, slik at olje fra pumpa 27 rettes ned til stemplet. Stemplet beveges nedover, åpner slusen 3, og trykker sammen fjærene 4, 5. Når stemplet når sin nederste posisjon blir den elektriske motoren 16 slått av. Den hydrauliske oljen forhindres fra å strømme tilbake vha. en tilbakeslagsventil. The electric motor 16 is started by an external control device and drives the pump 27. The solenoid valve 15 is energized and the return flow to the oil reservoir is shut off, so that oil from the pump 27 is directed down to the piston. The piston is moved downwards, opening the sluice 3, and compressing the springs 4, 5. When the piston reaches its lowest position, the electric motor 16 is switched off. The hydraulic oil is prevented from flowing back by a check valve.

Hvis den elektriske effekten tapes, vil magnetventilen 15 åpnes og den hydrauliske oljen som holder stemplet ned vil frigjøres, og de sammentrykte fjærene 4, 5 vil returnere stemplet til opprinnelig posisjon og sluseventilen vil lukke. If the electrical power is lost, the solenoid valve 15 will open and the hydraulic oil holding the piston down will be released, and the compressed springs 4, 5 will return the piston to its original position and the gate valve will close.

I fig. 2 er vist eksempel på hvordan metallbelgen kan arrangeres for å oppnå en hermetisk lukket aktuator samtidig som en fram- og tilbakebevegelse av ventilspindelen ikke medfører "pusting" mot omgivelsene. Den øvre delen av spindelen 6 er, i likhet med utførelsen vist i fig. 1, omgitt av en metallbelg 11 med et innvendig tversnittsareal lik spindelens nedre tverrsnittsareal. Dette innebærer at volumet mellom metallbelgen 11 og spindelen 6 er konstant når spindelen beveges opp og ned. En øvre elastomertetning 36 sikrer at belgen 11 ikke utsettes unødig for brønnvæske og liknende som måtte lekke over en nedre elastomertetning 37. En tilbakeslagsventil 38 hindrer trykkoppbygning, og at ytre forurensinger trenger inn i tetningsflatene. In fig. 2 shows an example of how the metal bellows can be arranged to achieve a hermetically sealed actuator at the same time that a forward and backward movement of the valve spindle does not cause "breathing" towards the surroundings. The upper part of the spindle 6 is, like the design shown in fig. 1, surrounded by a metal bellows 11 with an internal cross-sectional area equal to the spindle's lower cross-sectional area. This means that the volume between the metal bellows 11 and the spindle 6 is constant when the spindle is moved up and down. An upper elastomer seal 36 ensures that the bellows 11 is not unnecessarily exposed to well fluid and the like that might leak over a lower elastomer seal 37. A non-return valve 38 prevents pressure build-up, and that external contaminants penetrate the sealing surfaces.

Claims (7)

1. Elektro-hydraulisk ventilaktuator (30) for en ventil, omfattende en spindel (6) som presser ventilen til lukket ventilstilling ved hjelp av minst ei spiralfjær (4, 5), hvilken spindel (6) står i forbindelse med et stempelorgan som aktiveres ved hjelp av trykksatt hydraulisk fluid fra et trykkreguleringsorgan (16, 27, 12, 15), som omfatter et pumpearrangement (16, 27), en trykkbegrenser (12) og fjernstyrbar magnetventil (15), karakterisert ved at ventilaktuatoren (30) er trykkømpensert og hermetisk lukket fra omgivelsene, idet det anvendes minst to belgorganer (11,25), der et første belgorgan (11) er anordnet rundt øvre del av spindelen (6), for å sikre en hermetisk tetning mot brønnmediet, og et andre belgorgan (25) er anordnet for å kompensere trykket i aktuatorens (30) lavtrykksdel mot omgivelsene, slik at aktuatorkrafta forblir konstant og uavhengig av omgivelsestrykket.1. Electro-hydraulic valve actuator (30) for a valve, comprising a spindle (6) which presses the valve to the closed valve position by means of at least one coil spring (4, 5), which spindle (6) is connected to a piston means which is activated by means of pressurized hydraulic fluid from a pressure regulating device (16, 27, 12, 15), which comprises a pump arrangement (16, 27), a pressure limiter (12) and remote controllable solenoid valve (15), characterized in that the valve actuator (30) is pressure compensated and hermetically closed from the surroundings, using at least two bellows members (11,25), where a first bellows member (11) is arranged around the upper part of the spindle (6), to ensure a hermetic seal against the well medium, and a second bellows member ( 25) is arranged to compensate the pressure in the low-pressure part of the actuator (30) against the surroundings, so that the actuator force remains constant and independent of the ambient pressure. 2. Ventilaktuator i samsvar med krav 1, karakterisert ved trykkreguleringsorganene (16, 27, 12, 15) er plassert i et aksialt bevegbart hus (20) som via en kulekopling (23) er tilknyttet en gjenget tvangsstyringsaksel, som er anordnet for ved rotasjon i en retning å åpne ventilen ved å presse huset (20) og dermed spindelen (6) nedover.2. Valve actuator in accordance with claim 1, characterized by the pressure regulation members (16, 27, 12, 15) are placed in an axially movable housing (20) which is connected via a ball coupling (23) to a threaded forced control shaft, which is arranged to open the valve by pressing the housing (20) and thus the spindle (6) downwards. 3. Ventilaktuator i samsvar med krav 1, karakterisert ved trykkreguleirngsorganene (16, 27, 12, 15) er plassert i et bevegbart hus (20) som vha. eksternt styrt hydraulisk enhet muliggjør åpning av ventilen ved å presse huset (20) og dermed spindelen (6) nedover.3. Valve actuator in accordance with claim 1, characterized by the pressure regulation means (16, 27, 12, 15) are placed in a movable housing (20) which externally controlled hydraulic unit enables opening of the valve by pressing the housing (20) and thus the spindle (6) downwards. 4. Ventilaktuator i samsvar med krav 1-3, karakterisert ved at den fjernstyrbare magnetventilen (15) drenerer hydraulisk fluid fra sylinderkammeret når den elektriske effekten bortfaller.4. Valve actuator in accordance with requirements 1-3, characterized in that the remote controllable solenoid valve (15) drains hydraulic fluid from the cylinder chamber when the electrical effect ceases. 5. Ventilaktuator i samsvar med krav 1-4, karakterisert ved at det første belgorganet (11) har et effektivt areal lik arealet av ventilspindelens (6) nedre del slik at volumet mellom belgorganet og ventilspindelen (6) er konstant når ventilspindelen (6) beveges opp og ned.5. Valve actuator in accordance with requirements 1-4, characterized in that the first bellows member (11) has an effective area equal to the area of the lower part of the valve stem (6) so that the volume between the bellows member and the valve stem (6) is constant when the valve stem (6) is moved up and down. 6. Ventilaktuator i samsvar med krav 1-5, karakterisert ved at det anvendes en posisjonsindikator (24) som automatisk kopler ut pumpearrangementet (16, 27) når sluseventilen er helt åpen.6. Valve actuator in accordance with requirements 1-5, characterized in that a position indicator (24) is used which automatically disconnects the pump arrangement (16, 27) when the sluice valve is fully open. 7. Ventilaktuator i samsvar med krav 1-6, karakterisert ved pumpearrangementet (16, 27) er anordnet for å stoppe automatisk etter et gitt tidsrom.7. Valve actuator in accordance with requirements 1-6, characterized by the pump arrangement (16, 27) being arranged to stop automatically after a given period of time.
NO930753A 1993-03-01 1993-03-01 Electro-hydraulic valve actuator NO177241C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO930753A NO177241C (en) 1993-03-01 1993-03-01 Electro-hydraulic valve actuator
GB9403879A GB2276209A (en) 1993-03-01 1994-03-01 Electrohydraulic valve actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO930753A NO177241C (en) 1993-03-01 1993-03-01 Electro-hydraulic valve actuator

Publications (4)

Publication Number Publication Date
NO930753D0 NO930753D0 (en) 1993-03-01
NO930753L NO930753L (en) 1994-09-02
NO177241B true NO177241B (en) 1995-05-02
NO177241C NO177241C (en) 1995-08-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
NO930753A NO177241C (en) 1993-03-01 1993-03-01 Electro-hydraulic valve actuator

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GB (1) GB2276209A (en)
NO (1) NO177241C (en)

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US20010023928A1 (en) * 2000-01-06 2001-09-27 Green David Kentfiled Electrohydraulic valve actuator
WO2009039856A1 (en) * 2007-09-27 2009-04-02 Poul Elholm Jakobsen Valve actuator system
US9273796B2 (en) 2007-09-27 2016-03-01 Kmatic Aps Valve actuator system
NO328603B1 (en) 2008-05-14 2010-03-29 Vetco Gray Scandinavia As Underwater hybrid valve actuator system and method.
BR112014031768A2 (en) * 2012-06-20 2017-06-27 Shell Int Research preventive eruption controller, and method for sealing a borehole and stopping hydrocarbon flow through it
CN102797433B (en) * 2012-08-15 2014-10-29 中国石油大学(华东) Differential deep water blowout preventer control valve
CN106763803B (en) * 2015-11-20 2019-03-19 中国石油化工股份有限公司 A kind of control valve for small flows
CN107830216B (en) * 2017-12-26 2019-04-19 中山利特隆瓦斯器材有限公司 Type voltage regulation gas safety valve
CN113464082A (en) * 2021-06-29 2021-10-01 胡宪均 High-service-life rotary blowout preventer for oil field

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US5144801A (en) * 1989-04-28 1992-09-08 Parker Hannifin Corporation Electro-hydraulic actuator system
NO932900L (en) * 1992-08-21 1994-02-22 Ava Int Corp Bridge safety valve

Also Published As

Publication number Publication date
NO177241C (en) 1995-08-09
NO930753L (en) 1994-09-02
GB2276209A (en) 1994-09-21
NO930753D0 (en) 1993-03-01
GB9403879D0 (en) 1994-04-20

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