US3929163A - Pressure vessel with sensing device - Google Patents

Pressure vessel with sensing device Download PDF

Info

Publication number
US3929163A
US3929163A US486945A US48694574A US3929163A US 3929163 A US3929163 A US 3929163A US 486945 A US486945 A US 486945A US 48694574 A US48694574 A US 48694574A US 3929163 A US3929163 A US 3929163A
Authority
US
United States
Prior art keywords
gas
container
gas chamber
chamber
magnetic switch
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.)
Expired - Lifetime
Application number
US486945A
Other languages
English (en)
Inventor
Otmar Schon
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.)
GREE HYDRAULICS OF CALIFORNIA Inc
S-P MANUFACTURING Corp A CORP OF OHIO
Original Assignee
Greer Hydraulics Inc
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 Greer Hydraulics Inc filed Critical Greer Hydraulics Inc
Application granted granted Critical
Publication of US3929163A publication Critical patent/US3929163A/en
Assigned to GREE HYDRAULICS OF CALIFORNIA, INC. reassignment GREE HYDRAULICS OF CALIFORNIA, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: GREER HYDRAULICS, INCORPORATED, GREER HYDRAULICS OF CALIFORNIA, INC.
Assigned to VSI CORPORATION reassignment VSI CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE 12-16-81 Assignors: GREER HYDRAULICS, INCORPORATED
Assigned to FIGGIE INTERNATIONAL INC., A CORP. OF DE reassignment FIGGIE INTERNATIONAL INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VSI CORPORATION
Assigned to S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHIO reassignment S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIGGIE INTERNATIONAL INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F16L55/052—Pneumatic reservoirs
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Definitions

  • PRESSURE VESSEL WITH SENSING DEVICE As conducive to an understanding of the invention, in pressure reservoirs of the above type, it is essential that the volume of gas in the gas chamber be sufficient to provide for effective operation of the device, such as to expel a desired volume of oil from the oil chamber to the system to which the device is connected. If there should be leakage of gas from the gas chamber and hence undue loss of volume, it is essential that automatic monitoring of this condition be provided.
  • a switch which is actuated when the partition has reached the end of its movement, to actuate an alarm signal.
  • the switch is located so that when the gas volume has fallen below a predetermined amount required for safe operation, it will be actuated to give such alarm signal.
  • FIG. 1 is a longitudinal schematic view of a pressure reservoir according to one embodiment of the invention.
  • FIG. 2 is a view similar to FIG. 1 of another embodiment of the invention.
  • the pressure reservoir shown in FIG. 1 comprises a container of rigid material, such as steel or aluminum, capable of withstanding the pressure to which the device is subjected in use.
  • the container is formed from a central cylindrical sleeve 1, to the opposed rims of which are secured as by welding at W, W, the rims of two cup-shaped end portions 2 and 3, each having an axial opening 2 and 3', respectively.
  • thecentral sleeve 1 and end portion 2 could be formed integrally.
  • a movable partition 5 Positioned in the container is a movable partition 5, illustratively a bladder of deformable material such as natural or synthetic rubber, which divides the container into an oil chamber C in communication with opening 3', and a gas chamber G in communication with opening 2'.
  • a movable partition 5 illustratively a bladder of deformable material such as natural or synthetic rubber, which divides the container into an oil chamber C in communication with opening 3', and a gas chamber G in communication with opening 2'.
  • the bladder 5 is closed at one end and has an enlarged mouth, the rim of which is secured in the container by means of a clamp ring 4, in the form of a metal sleeve which is secured in the container by the weld W.
  • a tubular fitting 6 Secured as by welding in opening 3 is a tubular fitting 6, the bore of which defines an oil port 6', by means of which a conduit connected to a source of oil under pressure may be connected to the oil chamber C.
  • a valve member in the form of a metal disc 8 is axially mounted in the closed end of bladder 5 and is designed to move against the seat S formed at the inner end of fitting 6.
  • a metal plug 7 Secured as by welding in opening 2' is a metal plug 7 having an axial bore 7 therethrough and a cylindrical internally threaded recess 7" in its outer surface, through the floor of which the outer end of axial bore 7' extends.
  • a cylindrical switch housing 9 Mounted in recess 7" is the externally threaded lower end of a cylindrical switch housing 9.
  • the housing 9 has a bore 10 axially aligned with bore 7 in plug 7.
  • Axially movable in bore 10 is a cylindrical actuating member or stem 11, which has an annular groove in its periphery to mount a resilient stop ring 12. More particularly, as shown in FIG. 1, the bore 7 in plug 7 is of smaller diameter than the outer diameter of stop ring 12 so that the stop ring 12 will abut against the edge 7a of bore 7 to limit the inward movement of stem 11, the inner end of which is rounded as at 11.
  • the lower end of cylindrical housing 9 and the bore 7' of plug 7 are provided with a plurality of longitudinal grooves 10a, as shown.
  • a bolt 16 extending axially from the outer end 11 of actuating stem 11 are two annular permanent magnets 13 positioned between two washers l4 and 15 of nonmagnetic material the magnets 13 and washers l4 and 15 being retained in clamped position by a nut 17 screwed on the end of bolt 16.
  • a magnetic switch 18 which co-operates with said magnets 113 in the manner to be described, to activate an alarm signal (not shown).
  • the housing 9, the actuating stem 11, the washers 14, 15 and the bolt 16 and nut 17 are of non-magnetic material.
  • the actuator stem 11 will not be affected. However, if the volume of gas is too greatly reduced, either by excessive compression or by leakage from chamber G, the bladder 5 will be moved to the position shown in dot and dash lines in FIG. I so that valve member 8 will abut against the end 11 of actuator stem 11, moving the latter outwardly.
  • a spring may be provided to normally urge the actuating stem 11 to such position.
  • Such spring may be a coil spring positioned in bore between the shoulder formed by the reduced diameter portion thereof and the washer 15.
  • the invention is illustratively shown incorporated in a pressure reservoir using an open mouth bladder and in which the mouth of the bladder is secured to the wall of the container, the invention could as well be incorporated in a standard pressure reservoir in which the plug 7 could be bonded in the relatively smaller mouth of such bladder and the plug 7 secured in the gas port of such standard device, as by welding.
  • the container comprises a cup-shaped lower end portion 1a having an axial opening to receive a fitting 6; an upper cup-shaped end portion 2a with an axial opening 22; and a closure plate 22 of non-magnetic material.
  • Adjacent rims of end portions 1a and 2a are connected by welding as at W.
  • the closure plate 22 is secured in opening 22 as by welding at W.
  • the plate 22 has a port 19 in which a gas charging valve 19 is mounted and a magnetic switch 18 is secured to plate 22 so that a portion of the switch 18 will be axially aligned with the container.
  • the closed end of bladder 5a carries an axially mounted valve member 8 on its outer surface and an axially mounted permanent magnet 13a on its inner surface, the valve member 8 and magnet 13a preferably being moulded integrally with the bladder.
  • the invention above described may also be incorporated in a piston type pressure reservoir in which a movable piston defines the separation between the gas and oil chambers.
  • the piston may support on its side adjacent the gas chamber, a rod shaped, non-magnetic magnet carrier corresponding to actuating member 11 and its associated magnets.
  • the magnets and magnet carrier may engage with adequate clearance a non-magnetic housing corresponding to the switch housing 9 when the piston has arrived on the gas cham- 4 ber side in the vicinity of its end position, and actuate a magnetic switch mounted on the outside of the switch housing.
  • the chamber in which the magnets and magnet carrier will be accommodated must provide sufficient clearance for free movement of the movable elements to prevent compression.
  • a pressure vessel comprising a rigid container having a gas port and an oil port and a flexible partition intervening between said ports and defining a gas chamber and a liquid chamber, a magnetic switch positioned exteriorly of said container, a permanent magnet slidably mounted on said container, means protruding into said gas chamber operatively connected to said permanent magnet to move the latter, said means being in the path of movement of said flexible partition, said magnetic switch being substantially aligned with said permanent magnet to be actuated upon movement of the latter when the volume of gas in said gas chamber has fallen below a predetermined amount.
  • the gas port of said container has a cylindrical housing of non-magnetic material rising axially therefrom, said housing having at one end an axial bore in which an actuating assembly is slidably mounted, said assembly comprising an actuating stem having one end protruding into said gas chamber, a non-magnetic support extending axially from the other end of said stem, permanent magnet means mounted on said support, a gas charging valve mounted at the other end of said housing for charging of said gas chamber, said magnetic switch being mounted on said housing aligned with said permanent magnet means, said flexible partition being designed to abut against the protruding end of said stem.
  • a pressure vessel comprising a rigid container having a gas port and an oil port and a flexible partition intervening between said ports and defining a gas chamber and a liquid chamber, a magnetic switch mounted at one end of the container substantially aligned with the path of movement of the flexible partition toward said gas port and a permanent magnet carried by said flexible partition designed to be moved into juxtaposition with said magnetic switch when the gas volume in said gas chamber has fallen below a predetermined amount to actuate said magnetic switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Fluid-Pressure Circuits (AREA)
US486945A 1973-07-20 1974-07-10 Pressure vessel with sensing device Expired - Lifetime US3929163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732336965 DE2336965A1 (de) 1973-07-20 1973-07-20 Hydropneumatischer druckspeicher

Publications (1)

Publication Number Publication Date
US3929163A true US3929163A (en) 1975-12-30

Family

ID=5887527

Family Applications (1)

Application Number Title Priority Date Filing Date
US486945A Expired - Lifetime US3929163A (en) 1973-07-20 1974-07-10 Pressure vessel with sensing device

Country Status (8)

Country Link
US (1) US3929163A (en, 2012)
JP (2) JPS5070918A (en, 2012)
CA (1) CA1026204A (en, 2012)
DE (1) DE2336965A1 (en, 2012)
FR (1) FR2238074B1 (en, 2012)
GB (1) GB1479935A (en, 2012)
IT (1) IT1017265B (en, 2012)
SE (1) SE7409333L (en, 2012)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167201A (en) * 1978-04-03 1979-09-11 Greer Hydraulics, Inc. Pressure accumulator with failure indicator
US4192350A (en) * 1977-12-22 1980-03-11 Normand Trust Pressure vessel
US4367129A (en) * 1980-06-16 1983-01-04 Inoue-Japax Research Incorporated Wire-electroerosion method and apparatus for forming a tapered contour in a workpiece
US4428401A (en) 1982-08-12 1984-01-31 Vsi Corporation Failure sensing hydraulic accumulator and system
US4487226A (en) * 1982-08-12 1984-12-11 Vsi Corporation Failure sensing hydraulic accumulator and system
US4611634A (en) * 1983-09-26 1986-09-16 Brown, Boveri & Cie Ag High pressure accumulator
US4784182A (en) * 1987-10-05 1988-11-15 Nobuyuki Sugimura Bladder type accumulator associated with a sensor
US4907621A (en) * 1988-03-04 1990-03-13 Nobuyuki Sugimura Bladder-type accumulator with movable cup-shaped sensor
US5117873A (en) * 1990-10-22 1992-06-02 Honda Giken Kogyo Kabushiki Kaisha Bladder edge seal and holder for hydraulic fluid pressure accumulator
US5368073A (en) * 1993-10-07 1994-11-29 Essef Corporation Hydropneumatic pressure vessel having an improved diaphragm assembly
US5386925A (en) * 1993-06-21 1995-02-07 Amtrol Inc. Expansion tank
US20050022896A1 (en) * 2003-06-04 2005-02-03 Flamco B.V. Expansion tank
USD521858S1 (en) * 2003-09-17 2006-05-30 Roy Donald J Stud support
US20110036425A1 (en) * 2007-05-15 2011-02-17 Ermanno Martinello Apparatus for controlling a water-pressurization system
US20190120257A1 (en) * 2016-06-25 2019-04-25 Hydac Technology Gmbh Hydropneumatic piston accumulator
CN111536086A (zh) * 2020-05-18 2020-08-14 太原科技大学 一种电磁辅助皮囊式恒压蓄能器
US10988219B1 (en) * 2017-06-14 2021-04-27 Hadal, Inc. System and apparatus for integrated pressure compensator

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509838B1 (fr) * 1981-07-15 1985-07-26 Schrader Sa Dispositif pour l'etablissement et le controle de la pression dans les accumulateurs oleo-pneumatiques
JPS5973607U (ja) * 1982-11-10 1984-05-18 日立金属株式会社 圧力容器
JPS59196995A (ja) * 1984-01-24 1984-11-08 Hitachi Metals Ltd 給水装置
JPS6023601A (ja) * 1984-06-27 1985-02-06 Hitachi Metals Ltd 圧力容器
JPS6023602A (ja) * 1984-06-27 1985-02-06 Hitachi Metals Ltd 圧力容器
JPH0617681B2 (ja) * 1985-08-03 1994-03-09 中村工機株式会社 アキュムレ−タのブラダ挙動検出装置
JPH0612241Y2 (ja) * 1986-10-09 1994-03-30 宣行 杉村 中間センサ付ブラダ形アキュムレータ
DE102013205264A1 (de) * 2013-03-26 2014-10-02 Robert Bosch Gmbh Hydropneumatischer Speicher

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450162A (en) * 1965-05-11 1969-06-17 Olaer Patent Co Pressure vessel with control device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2236098B1 (en, 2012) * 1973-07-04 1976-11-12 Gratzmuller Jean Louis

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450162A (en) * 1965-05-11 1969-06-17 Olaer Patent Co Pressure vessel with control device

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192350A (en) * 1977-12-22 1980-03-11 Normand Trust Pressure vessel
FR2422055A1 (fr) * 1978-04-03 1979-11-02 Greer Hydraulics Inc Reservoir de pression avec un indicateur de panne
US4167201A (en) * 1978-04-03 1979-09-11 Greer Hydraulics, Inc. Pressure accumulator with failure indicator
US4367129A (en) * 1980-06-16 1983-01-04 Inoue-Japax Research Incorporated Wire-electroerosion method and apparatus for forming a tapered contour in a workpiece
US4428401A (en) 1982-08-12 1984-01-31 Vsi Corporation Failure sensing hydraulic accumulator and system
US4487226A (en) * 1982-08-12 1984-12-11 Vsi Corporation Failure sensing hydraulic accumulator and system
US4611634A (en) * 1983-09-26 1986-09-16 Brown, Boveri & Cie Ag High pressure accumulator
US4784182A (en) * 1987-10-05 1988-11-15 Nobuyuki Sugimura Bladder type accumulator associated with a sensor
US4907621A (en) * 1988-03-04 1990-03-13 Nobuyuki Sugimura Bladder-type accumulator with movable cup-shaped sensor
US5117873A (en) * 1990-10-22 1992-06-02 Honda Giken Kogyo Kabushiki Kaisha Bladder edge seal and holder for hydraulic fluid pressure accumulator
US5386925A (en) * 1993-06-21 1995-02-07 Amtrol Inc. Expansion tank
US5368073A (en) * 1993-10-07 1994-11-29 Essef Corporation Hydropneumatic pressure vessel having an improved diaphragm assembly
US20050022896A1 (en) * 2003-06-04 2005-02-03 Flamco B.V. Expansion tank
US7111653B2 (en) * 2003-06-04 2006-09-26 Flamco B.V. Expansion tank
USD521858S1 (en) * 2003-09-17 2006-05-30 Roy Donald J Stud support
US20110036425A1 (en) * 2007-05-15 2011-02-17 Ermanno Martinello Apparatus for controlling a water-pressurization system
US20190120257A1 (en) * 2016-06-25 2019-04-25 Hydac Technology Gmbh Hydropneumatic piston accumulator
US10781830B2 (en) * 2016-06-25 2020-09-22 Hydac Technology Gmbh Hydropneumatic piston accumulator
US10988219B1 (en) * 2017-06-14 2021-04-27 Hadal, Inc. System and apparatus for integrated pressure compensator
CN111536086A (zh) * 2020-05-18 2020-08-14 太原科技大学 一种电磁辅助皮囊式恒压蓄能器
CN111536086B (zh) * 2020-05-18 2021-10-29 太原科技大学 一种电磁辅助皮囊式恒压蓄能器

Also Published As

Publication number Publication date
DE2336965A1 (de) 1975-02-06
SE7409333L (en, 2012) 1975-01-21
FR2238074B1 (en, 2012) 1979-05-25
FR2238074A1 (en, 2012) 1975-02-14
IT1017265B (it) 1977-07-20
GB1479935A (en) 1977-07-13
JPS5070918A (en, 2012) 1975-06-12
CA1026204A (en) 1978-02-14
JPS591901U (ja) 1984-01-07

Similar Documents

Publication Publication Date Title
US3929163A (en) Pressure vessel with sensing device
US3625321A (en) Shock absorber and fluid-compensating means
US3625242A (en) Pressure accumulator
US4030716A (en) Pneumatic suspension element
US3230975A (en) Composite movable partition for pressure vessel
US2922614A (en) Hum-free solenoid device
US4610369A (en) Pressure vessel
US4487226A (en) Failure sensing hydraulic accumulator and system
US3511280A (en) Pressure vessel
US4782862A (en) Solenoid valve
US3782418A (en) Pressure pulse dampener device
US3537357A (en) Hydropneumatic accumulator
US2401792A (en) Accumulator
US4428401A (en) Failure sensing hydraulic accumulator and system
US3862646A (en) Combined filling tube and pressure indicator
US3139159A (en) Filling arrangement for a telescopic suspension unit
CA1140838A (en) Pressure accumulator having a long life distensible bladder
US3918693A (en) Shock absorber
US3066700A (en) Resiliently controlled valve
US2731038A (en) Hydraulic accumulator
US4015819A (en) Gas charging value for accumulator
US4178965A (en) Pulsation dampener device
US3138176A (en) Pressure device
US3450162A (en) Pressure vessel with control device
US5520208A (en) Resilient seal for a liquid-gas accumulator

Legal Events

Date Code Title Description
AS Assignment

Owner name: GREE HYDRAULICS OF CALIFORNIA, INC., A CORP. OF CA

Free format text: MERGER;ASSIGNOR:GREER HYDRAULICS, INCORPORATED, GREER HYDRAULICS OF CALIFORNIA, INC.;REEL/FRAME:004014/0964

Effective date: 19811218

AS Assignment

Owner name: VSI CORPORATION

Free format text: MERGER;ASSIGNOR:GREER HYDRAULICS, INCORPORATED;REEL/FRAME:004013/0645

Effective date: 19820204

AS Assignment

Owner name: FIGGIE INTERNATIONAL INC., 1000 VIRGINIA CENTER PA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VSI CORPORATION;REEL/FRAME:004822/0665

Effective date: 19871218

Owner name: FIGGIE INTERNATIONAL INC., A CORP. OF DE,VIRGINIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VSI CORPORATION;REEL/FRAME:004822/0665

Effective date: 19871218

AS Assignment

Owner name: S-P MANUFACTURING CORPORATION, THE, A CORP. OF OHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FIGGIE INTERNATIONAL INC.;REEL/FRAME:005017/0972

Effective date: 19890106