US3845636A - Control device for maintaining the level of a liquified gas in a container between two different limits - Google Patents

Control device for maintaining the level of a liquified gas in a container between two different limits Download PDF

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Publication number
US3845636A
US3845636A US00281342A US28134272A US3845636A US 3845636 A US3845636 A US 3845636A US 00281342 A US00281342 A US 00281342A US 28134272 A US28134272 A US 28134272A US 3845636 A US3845636 A US 3845636A
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Prior art keywords
space
pressure
piston
vapour
container
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Expired - Lifetime
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US00281342A
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English (en)
Inventor
Mal H Van
A Mijnheer
H Rauwerdink
Wit J De
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US Philips Corp
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US Philips Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/02—Level control, e.g. controlling quantity of material stored in vessel without auxiliary power
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/04—Level control, e.g. controlling quantity of material stored in vessel with auxiliary non-electric power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/043—Localisation of the removal point in the gas
    • F17C2223/045—Localisation of the removal point in the gas with a dip tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/046—Localisation of the removal point in the liquid
    • F17C2223/047—Localisation of the removal point in the liquid with a dip tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/061—Level of content in the vessel

Definitions

  • a control device for maintaining the level of a liquefied gas in a main container between two differenct limits comprises a first vapor pressure bulb which is at the higher limit and a second vapor pressure bulb which is at the lower level, the bulbs containing a medium under pressure which condenses at the temperature of the liquefied gas.
  • the medium pressures can actuate first and second control valves, which control flow of liquified gas from a storage container into said main container.
  • the invention relates to a control device for main taining the level of a liquefied gas in a container between two different limits.
  • the container communicates, via a siphon with the liquid space of a storage container, the vapour space of the container being made to communicate with a vapour outlet.
  • the control device comprises a first vapour pressure bulb arranged at the higher limit and a second vapour pressure bulb arranged at the lower limit, the bulbs containing a medium under pressure which condenses at the temperature of the liquefied gas.
  • the medium pressures are capable of actuating first and second control valves in such manner that the communication of the vapour space of the storage container with the vapour outlet is interrupted by the valves when the level of the liquefied gas in the container falls below the lower limit, and is released when the level exceeds the higher limit.
  • a device of this type is known from Cryogenics 1962, pg. 145: An automatic arrangement for supplying a space with liquid nitrogen.
  • the medium in the vapour pressure bulbs may be the same as in the container and storage container, respectively, but this is not strictly necessary.
  • the known device exhibits a few drawbacks.
  • the construction of the control mechanism which comprises two control valves is rather complicated and expensive.
  • One control valve moves transverse to the direction of movement of the other so as to control the stroke of the last-mentioned control valve via a mechanical contact with the other.
  • the first mentioned control valve comprises a frame construction having a pin which is to cooperate accurately with a special jacket arranged around the other control valve and serving as a guide.
  • a reliable operation of such a construction requires accurate dimensions and accurate assembly of the components, respectively.
  • Due to the mechanical contact between the two control valves which are each subject to variable pressures, the control mechanism is subject to rather strong detrition and sensitive to disturbances. Both control valves are difficult to assemble and dismantle.
  • a further drawback of the known device is that, when the level of the liquefied gas in the container has fallen below the lower limit and therefore the communication of the vapour space of the storage container with the vapour outlet which usually communicates with the atmosphere is interrupted.
  • the transport of liquid from the storage container to the container starts only when so much liquid has evaporated in the storage container due to heat inleak from without that a sufficiently high pressure in the vapour space has built up to effect the siphoning action. So the liquid flow into to the container lags behind in time with respect to the instant of closure-off of the vapour space from the vapour outlet. This is often undesirable, in particular in the case of measurements.
  • the device according to the invention is characterized in that the first control valve is constituted by a first piston-like memher which is incorporated in a first housing and can reciprocate therein in the axial direction.
  • the piston has one end face which constitutes a wall of first space which is in open communication with the first vapour pressure bulb and is otherwise closed.
  • the other end face of the piston constitutes the boundary of a second space which is in open communication with the second vapour pressure bulb.
  • the second space furthermore comprises a communication which, when the first piston-like member reciprocates, is alternately closed and released by said member.
  • the second control valve is constituted by a second piston-like member which is accommodated in a second housing with some amount of play and can reciprocate therein in the axial direction.
  • This second piston has one end face which constitutes a wall of a third space which communicates with the communication with the second space and is otherwise closed and constitutes this pistons other end face constitutes the boundary of a fourth space which communicates with an auxiliary vessel containing a pressure medium.
  • the second piston-like member upon reciprocating is capable of communicating the vapour space of the storage container alternately with the fourth space and the vapour outlet.
  • the medium pressures in the vapour pressure bulbs, the pressure medium pressure in the auxiliary vessel, and the surface areas of the end faces of the piston-like members are furthermore chosen such that when the level of the liquefied gas in the container lies below the second vapour pressure bulb, the resulting force on the first piston-like member causes said member to assume a position in which the second space is in open communication with the third space.
  • the resulting force on the second piston-like member causes said member to assume a position in which the vapour space of the storage container is in open communication with the fourth space.
  • the second piston-like member interrupts the communication between the vapour space and the fourth space and produces an open communication between the vapour space and the vapour outlet.
  • control valves of a simple and cheap construction ensure in addition that immediate transport of liquid from the storage container to the container takes place when the liquid level in the container falls below the lower limit and discontinues immediately when sai level reaches the higher limit.
  • the control valves mutually may be arranged in any position and since they are not in direct mechanical contact with each other, they are less subject to detrition.
  • the valves can be mounted and dismantled separately.
  • the second piston-like memher can cooperate in a sealing manner over at least a part of its length with a cyclindrical seat present between the third and the fourth space via at least one first and at least one second seal.
  • These seals viewed in the axial direction, are located one behind the other at a mutual distance which is smaller than the axial dimension of the seat and are each incorporated in a groove in the wall of the second piston-like member and which seals separate the fourth space from a fifth space which is in open communication with the vapour outlet.
  • the slit-like annular duct present between the said seals and constituted by the relevant wall parts of second piston-like member and seat is in open communication with the vapour space of the storage container; the seals are capable of alternately communicating the annular duct with either the fourth or the fifth space when the second piston-like member reciprocates.
  • first resilient means are present which exert a force on the first piston, said force being directed opposite to the force exerted on said member by the medium in the first space.
  • a further favourable embodiment of the control device according to the invention is characterized in that second resilient means are present which exert a force on the second piston, said force being directed opposite to the force exerted on said member by the medium in the third space.
  • the pressure medium in the auxiliary container may now have a pressure which is only slightly higher than atmospheric pressure.
  • FIGS. 1 and 2 show embodiments of the control device
  • FIG. 3 shows various positions of the first control valve of the control device shown in FIG. 2,
  • FIG. 4 shows a further embodiment of the first control valve
  • FIG. 5 shows a further embodiment of the second control valve.
  • reference numeral 1 denotes a container which contains liquid nitrogen. Via a siphon 2 the container communicates with the liquid space of a storage first container 3 which also contains liquid nitrogen.
  • a vapour duct 4 communicates with the vapour space of the storage container 3 and can be made to communicate with a vapour outlet 5.
  • Two vapour pressure bulbs 6 and 7 or sensing means which are arranged at different limits are present in the container 1, namely the first bulb 6 at the higher limit and the second bulb 7 at the lower limit.
  • the two vapour pressure bulbs also contain nitrogen.
  • the control device comprises a control valve 8 having a piston 9 which can reciprocate in the axial direction in a housing 10 and is secured to the housing 10 via a bellows 11.
  • One end face 12 of the piston 9 constitutes a wall of a first space 13 present inside the bellows 11, which space is in open communication with the vapour pressure bulb 6 via a duct 14.
  • the other end face 15 faces a second space 16 which is in open communication with the vapour pressure bulb 7 via a duct 17.
  • the piston 9 can cooperate in a sealing manner with a seat 18 and in this manner communicates or not communicates the space 16 with a duct 19 by being in on or off conditions, correspondingly.
  • a compression spring 20 which exerts a force upwards on the piston.
  • the control device furthermore comprises a second control valve 21, having a piston 22 which can reciprocate in the axial direction in a housing 23 and is secured to said housing via a bellows 24.
  • One end face 25 of the piston 22 constitutes a wall of a third space 26 present within the bellows 24, with which space the duct 19 communicates with its other side.
  • the other end face 27 of the piston 22 also bounds a fourth space 28 which communicates, via a duct 29 in which a cock 30 is incorporated, with an auxiliary vessel 31 containing nitrogen gas as a pressure medium.
  • the piston 22 In its central longitudinal part the piston 22 is shaped so that in cooperation with seat 32, it can operate as a double-operating valve: in the extreme right position or closed condition, as shown in the drawing, the vapour duct 4 communicating with the second control valve 21, communicates with the vapour outlet 5 which likewise communicates with said second control valve and is cut off from the fourth space 28; in the extreme left position or open condition, the fourth space communicates with the vapour duct 4, which duct is then cut off from the vapour outlet 5. Furthermore a compression spring 33 is present between the end face 27 of the piston 22 and the wall of the housing 23, which spring exerts a force to the right of said member.
  • Vapour pressure bulb 7 has a higher filling pressure than vapour pressure bulb 6, namely 7 and 4 atmospheres,
  • Compression spring 20 now exerts a sufficiently large force on the piston 9 to push said member upwards as a result of which the nitrogen gas in the duct 19 and the space 26 obtains the opportunity of flowing, via duct 17, to the vapour pressure bulb 7 and condensing therein. So the pressure in the space 26 drops to 1 atmosphere. Compression spring 33 and the excessive pressure of auxiliary container 31 which prevails in the space 28, ensure that the pistonlike member 22 of the second control valve 21 is pressed to the right against seating 32. The first and the second control valve assume a position as is shown in the Figure. Auxiliary container 31 is cut off from both the vapour duct 4 and the vapour outlet 5 which now communicate with each other. The latter has for its result that the excessive pressure still present in the storage container 3 is released via the vapour outlet. Because of the fact that atmospheric pressure prevails again in the vapour space of the storage container 3, the siphoning action and hence the transport of liquid is discontinued.
  • the liquefied gas is liquid nitrogen, while the vapour pressure bulbs also contain nitrogen.
  • the control device may equally be used for other liqudfied gases, for example, hydrogen, helium and neon and the like, while the filling gas of the vapour pressure bulbs need not be the same as the liquefied gas.
  • oxygen may be used as a filling gas while the liquefied gas is nitrogen.
  • the vapour outlet may open into the atmosphere. In certain circumstances, however, it may be suitable to connect a receiving container to the vapour outlet, for example, when comparatively expensive and rare gases are used.
  • the second control valve 21 has the drawback that during switching the communication between the vapour duct 4 and the vapour outlet 5 to the communication between the said vapour duct and the auxiliary container 31 vice versa an open communication exists for a short period of time between the auxiliary container 31 and the vapour outlet 5. This is the case when the piston like member 22 is in or near its central position. All this results in loss of pressure medium and in unnecessary pressure drop in auxiliary container 31.
  • the control valve 8 differs from that shown in FIG. 1 in that the first piston 9 is not connected to the housing 11) via a bellows, but comprises an O-ring 34 as a seal, as a result of which the space 13 together with the duct 14 and vapour pressure bulb 6 constitute a closed assembly. Furthermore, the piston 9 comprises an O- ring 35 as a seal. During the reciprocating movement of said piston, aperture 36 is alternately closed and released and hence the communication between the space 16 and the duct 19 is interrupted and produced.
  • the second control valve 21 comprises an O-ring 37 as a seal between the second piston 22 and the housing 23.
  • Piston 22 comprises a cylindrical central section which can cooperate in a sealing manner with the cylindrically constructed seating 32, via O-ring seals 38 and 39 which are present mutually at a distance smaller than the axial dimension of the seating 32 and are incorporated in grooves in the wall of the central section.
  • a slit-like annular duct 40 is formed which, via vapour duct 4, is in open communication with the vapour space of the storage container 3.
  • the annular duct 40 is alternately communicated with either the fourth space 28 or a fifth space 41 with which the vapour outlet communicates, while during the switching there is at no instant an open communication between the fourth and the fifth space. So pressure medium from the auxiliary container 31 cannot reach the vapour outlet 5 via the fourth space 28, annular duct 40, and fifth space 41 and be lost in vain. All this is explained with reference to FIG. 3, in which the piston 22 is shown in three different positions. In the extreme left position shown in FIG. 3a the annular duct 40 is in open communication with the fourth space 28. Both the annular duct 40 and the fourth space 28 are separated from the fifth space 41 by O-ring seal 39.
  • FIG. 3b shows the central position. Annular duct 40 is cut off from the fourth space 28 and the fifth space 41. Seals 38 and 39 prevent pressure medium from flowing out of the fourth space 28 to the fifth space 41.
  • FIG. 30 shows the extreme right position. Annular duct 40 communicate with the fifth space 41. Seal 38 ensures that pressure medium cannot flow from the fourth space 28 to the fifth space 41.
  • FIG. 4 shows a further embodiment of the first control valve 8.
  • the annular member 9 is connected to the housing 10 via a bellows 42 in a manner analogous to that of the first control valve shown in FIG. 1.
  • the same reference numerals are used as in FIG. 2.
  • FIG. 5 shows a further embodiment of the second control valve 21.
  • the piston 22 in the present case is connected to the housing 23 via a bellows 43.
  • the same reference numerals are used for the rest.
  • a control device for maintaining the level of a liquid between high and low levels in a first container, this device operable with a storage container having therein liquid with a vapor space above said liquid, and an auxiliary container having therein gas at a pressure greater than atmospheric pressure, the device comprising first and second valve means, the second valve means having a vapor outlet to the atmosphere and having an open condition for interconnecting said auxiliary container with said vapor space in the storage container for flow of gas thereto, and a closed condition for interconnecting said vapor space with said vapor outlet, the first valve means having on and off conditions for actuating said second valve means to be correspondingly in its open and closed positions, sensing means for determining when the liquid in the first container is above and below both of said high and low levels, said sensing means comprising high and low vapor-pressure bulbs at said levels, each bulb having therein high pressure vapor when the liquid in said first container is below said bulb, and having low pressure therein when the liquid is above and contacting the bulb and vapor in said bulb condenses, the
  • said first valve means comprises a housing with inlet and outlet openings and valve seat intermediate said openings, and a piston movable to closed position against said seat and open position away from said seat, a resiliant means urging said piston toward open position, said low vapor pressure bulb in communication with one side of said piston and said high-vapor pressure bulb in communication with the other side of said piston, whereby high and low pressures from said bulbs urge said piston to move correspondingly for actuating said second valve means.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US00281342A 1970-06-26 1972-08-17 Control device for maintaining the level of a liquified gas in a container between two different limits Expired - Lifetime US3845636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7009420A NL7009420A (enrdf_load_stackoverflow) 1970-06-26 1970-06-26

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US3845636A true US3845636A (en) 1974-11-05

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US (1) US3845636A (enrdf_load_stackoverflow)
BE (1) BE769012A (enrdf_load_stackoverflow)
CA (1) CA940004A (enrdf_load_stackoverflow)
CH (1) CH531211A (enrdf_load_stackoverflow)
DE (1) DE2129870A1 (enrdf_load_stackoverflow)
FR (1) FR2099987A5 (enrdf_load_stackoverflow)
GB (1) GB1359000A (enrdf_load_stackoverflow)
NL (1) NL7009420A (enrdf_load_stackoverflow)
SE (1) SE365050B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041725A (en) * 1976-03-04 1977-08-16 Galt Equipment Limited Control system for refrigeration unit
US4198828A (en) * 1977-06-09 1980-04-22 Societe d'Etudes d'Automatisation, de Regulation et d'Appareils de Mesures S.A. Cryostat and coolant-supply system therefore
US4228662A (en) * 1978-02-17 1980-10-21 Deutsche Forschungs- und Versuchsanstalt fur Luftund Raumfahrt e.V. Cryogenic apparatus
US4475348A (en) * 1982-07-26 1984-10-09 Minnesota Valley Engineering, Inc. Method and apparatus for filling cryogenic liquid cylinders
US4607490A (en) * 1984-05-09 1986-08-26 Messerschmitt-Bolkow-Blohm Gmbh Helium II phase separator
US4694655A (en) * 1985-08-23 1987-09-22 Messerschmitt-Bolkow-Blohm Gmbh Controllable helium-II phase separator
US4744222A (en) * 1986-02-27 1988-05-17 Mitsubishi Denki Kabushiki Kaisha Very low temperature liquid transfer system
US4891951A (en) * 1987-12-26 1990-01-09 Aisin Seiki Kabushiki Kaisha Refrigeration system
EP0407283A1 (fr) * 1989-07-05 1991-01-09 Societe Europeenne De Propulsion Accumulateur de liquide sous haute pression à niveau de liquide régulé
US5215101A (en) * 1990-05-10 1993-06-01 Symbiosis Corporation Sharply angled kelly (Jacobs's) clamp
US5258004A (en) * 1991-04-04 1993-11-02 Symbiosis Corporation Double acting, dual pivot thoracoscopic surgical lung clamps
US20070095668A1 (en) * 2005-10-31 2007-05-03 Phillip Pendleton Liquid nitrogen level control system
EP3674594A1 (en) * 2018-12-28 2020-07-01 Chart Inc. Storage tank with pressure actuated fill termination assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE399753B (sv) * 1976-06-01 1978-02-27 Aga Ab Anordning for att fylla en vetska fran en forradsbehallare till ett kerl
US4334410A (en) 1980-12-03 1982-06-15 Huguette Drumare Tank designed to contain a liquefied gas
GB2129122B (en) * 1982-10-25 1986-03-26 British Gas Corp Fluid flow control system particularly for a gas holder

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2756765A (en) * 1954-06-01 1956-07-31 Machlett Lab Inc System for maintaining liquid level
US3049887A (en) * 1960-02-15 1962-08-21 Gen Dynamics Corp Liquid control device
US3151468A (en) * 1962-04-26 1964-10-06 Cryogenics Inc Liquid level control for cold traps
US3307367A (en) * 1964-10-28 1967-03-07 Max Planck Gesellschaft Control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756765A (en) * 1954-06-01 1956-07-31 Machlett Lab Inc System for maintaining liquid level
US3049887A (en) * 1960-02-15 1962-08-21 Gen Dynamics Corp Liquid control device
US3151468A (en) * 1962-04-26 1964-10-06 Cryogenics Inc Liquid level control for cold traps
US3307367A (en) * 1964-10-28 1967-03-07 Max Planck Gesellschaft Control device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4041725A (en) * 1976-03-04 1977-08-16 Galt Equipment Limited Control system for refrigeration unit
US4198828A (en) * 1977-06-09 1980-04-22 Societe d'Etudes d'Automatisation, de Regulation et d'Appareils de Mesures S.A. Cryostat and coolant-supply system therefore
US4228662A (en) * 1978-02-17 1980-10-21 Deutsche Forschungs- und Versuchsanstalt fur Luftund Raumfahrt e.V. Cryogenic apparatus
US4475348A (en) * 1982-07-26 1984-10-09 Minnesota Valley Engineering, Inc. Method and apparatus for filling cryogenic liquid cylinders
US4607490A (en) * 1984-05-09 1986-08-26 Messerschmitt-Bolkow-Blohm Gmbh Helium II phase separator
US4694655A (en) * 1985-08-23 1987-09-22 Messerschmitt-Bolkow-Blohm Gmbh Controllable helium-II phase separator
US4744222A (en) * 1986-02-27 1988-05-17 Mitsubishi Denki Kabushiki Kaisha Very low temperature liquid transfer system
US4891951A (en) * 1987-12-26 1990-01-09 Aisin Seiki Kabushiki Kaisha Refrigeration system
EP0407283A1 (fr) * 1989-07-05 1991-01-09 Societe Europeenne De Propulsion Accumulateur de liquide sous haute pression à niveau de liquide régulé
FR2649451A1 (fr) * 1989-07-05 1991-01-11 Europ Propulsion Accumulateur de liquide sous haute pression a niveau de liquide regule
US5036661A (en) * 1989-07-05 1991-08-06 Societe Europeenne De Propulsion Regulated level accumulator for liquid under high pressure
US5215101A (en) * 1990-05-10 1993-06-01 Symbiosis Corporation Sharply angled kelly (Jacobs's) clamp
US5258004A (en) * 1991-04-04 1993-11-02 Symbiosis Corporation Double acting, dual pivot thoracoscopic surgical lung clamps
US20070095668A1 (en) * 2005-10-31 2007-05-03 Phillip Pendleton Liquid nitrogen level control system
EP3674594A1 (en) * 2018-12-28 2020-07-01 Chart Inc. Storage tank with pressure actuated fill termination assembly
US11402067B2 (en) 2018-12-28 2022-08-02 Chart Inc. Storage tank with pressure actuated fill termination assembly
US12085234B2 (en) 2018-12-28 2024-09-10 Chart Inc. Storage tank with pressure actuated fill termination assembly

Also Published As

Publication number Publication date
CH531211A (de) 1972-11-30
SE365050B (enrdf_load_stackoverflow) 1974-03-11
CA940004A (en) 1974-01-15
DE2129870A1 (de) 1972-01-05
NL7009420A (enrdf_load_stackoverflow) 1971-12-28
FR2099987A5 (enrdf_load_stackoverflow) 1972-03-17
GB1359000A (en) 1974-07-03
BE769012A (fr) 1971-12-24

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