US3428091A - Accumulator - Google Patents

Accumulator Download PDF

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US3428091A
US3428091A US593444A US3428091DA US3428091A US 3428091 A US3428091 A US 3428091A US 593444 A US593444 A US 593444A US 3428091D A US3428091D A US 3428091DA US 3428091 A US3428091 A US 3428091A
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Prior art keywords
gas bag
valve
accumulator
liquid
bag
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US593444A
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Kazuo Sugimura
Nobuyuki Sugimura
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    • 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
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion 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
    • 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
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • F15B1/20—Anti-extrusion means fixed to the separating 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
    • F15B2201/20—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
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • 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
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • 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

  • An elastic gas bag accumulator having at its bottom hemispherical end an inwardly projecting integral circular ridge for preventing the gas bag from sulfering a sharp reverse bend when it collapses.
  • This invention relates to the improvement of the gas bag of accumulators of the pressure liquid type, which consist of a rigid cylindrical pressure liquid tank, and of an elastic and flexible cylindrical gas bag, generally called a bladder, filled with gas under a certain standard pressure, and disposed within the tank.
  • An object of this invention is to permit the wall of the gas bag to bend with a suflicient radius around its hemispherical or lower bottom end when the gas bag is collapsed, so as to prevent the wall from being injured due to sharp bend of the wall, and thus to elongate the useful life of the gas bag.
  • FIG. 1 is a cross-sectional view through one embodiment of an accumulator in accordance with the present invention
  • FIGS. 23 are cross-sectional views through modified forms of accumulators in accordance with the present invention.
  • FIG. 4 is a partial cross-sectional view through a still further modification of accumulator
  • FIG. 5 is a partial cross-sectional view showing the lower end of a prior art type of gas bag.
  • FIG. 6 is a partial cross-sectional view showing through the lower end of a gas bag in accordance with the present invention.
  • FIG. 1 shows a first embodiment of an accumulator in accordance with the present invention.
  • 1 is the pressure oil tank of rigid material
  • 2 is the gas bag, whose one end is hemispherical and the other open end is flanged so as to be compressed and fixed to one end of the tank 1 by a cover and a ring nut 16, to form a gas bag, into which gas is charged through a gas valve 14, provided on the cover 15.
  • a liquid port 5 is provided with a poppet valve 7 and its seat 6 to close and open the liquid port 5.
  • this accumulator When this accumulator is installed in a pressure liquid system when the liquid pressure of the system is higher than the gas pressure within the gas bag, pressure liquid will flow into the liquid tank 1 through the liquid port 5 to be accumulated in the tank, with the gas bag being collapsed; and when the liquid pressure of the system drops lower than the gas pressure the collapsed gas bag will expand to discharge pressure liquid out of the tank through the liquid port.
  • the cylindrical gas bag inflates radially and longitudinally, and the gas bag will first touch and press against the cylindrical wall of the liquid tank, and then the hemispherical end will touch the valve 7 and finally push it downwardly against its seat 6, thus closing the liquid port 5.
  • the gas bag according to the present invention has a circular ridge 11, which is integrally provided within the bag, approximately at the edge of the thickened portion of the hemispherical end of the bag as shown in FIG. 1.
  • FIG. 1 is an accumulator of conventional type equipped with the gas bag 2 of the present invention, which has a circular ridge 11, which is integrally provided approximately along the border of the cylindrical wall and the hemispherical end as above described.
  • the poppet valve 7 is supported by its valve stem 8 in a valve guide 9 through a coil spring 10, which acts to open the valve 7.
  • FIG. 2 shows the second embodiment, in which like reference numerals represent the same parts as in the first embodiment.
  • the difference between the first and second embodiments is that the gas bag 2 and the poppet valve 7 are made integral, i.e., the valve 7 is cast integral into the spherical end of the gas bag 2.
  • the ridge 11 is provided along and above the circumference of the valve within the bag.
  • valve 7 being thus equipped integral with the end of the bag 2, and the valve spindle 8 being guided by the valve guide 9 along the longitudinal center line of the accumulator, the gas bag 2, in spite of its buoyancy in the liquid, is always kept straight along the center line of the oil tank 1 even if the accumulator is installed horizontally or inclined.
  • the gas bag in the conventional accumulators, whose poppet valve is separated from the gas bag, the gas bag is bent due to the buoyancy when the accumulator is installed inclined or horizontally, and therefore the bag touches the wall of the liquid tank, causing friction not only to damage the gas bag but also to decrease the sensibility of absorbing hydraulic shocks of the accumulator due to the frictional resistance between the bag and the liquid tank.
  • the poppet valve 7 is also integral with the gas bag 2 at its cylindrical end, and the ridge 11 is provided along and above the circumference of the valve 7, as in the second embodiment.
  • the valve stabilizing mechanism being provided outside of the gas bag as in the second embodiment, in this third embodiment the valvestabilizal.
  • ing mechanism is all located inside of the gas bag 2 as shown in FIG. 3.
  • a tubular valve guide 9 is rigidly fixed at one of its ends to the liquid tank cover 15 within the tank 1 along its center line.
  • the valve spindle 8 provided on the upper side of the valve 7 is slidably arranged and a tension coil spring 10 is provided within the valve guide hooked at one end to the liquid tank cover 15 and at the other end to the valve spindle 8 which acts to open the valve 7.
  • the liquid port is quite clear of any obstacles and the liquid can flow freely through the port with minimum resistance, which gives the accumulator a high sensibility both to absorb hydraulic shocks and to discharge pressure liquid promptly into the pressure liquid system.
  • FIG. 4 shows the fourth embodiment wherein the poppet valve 7 which has neither a valve spindle nor a guide is integrally attached to the cylindrical end of the gas bag 2.
  • An accumulator according to this embodiment has the same characteristics as an accumulator of the third embodiment wherein the pressure liquid can flow freely through the liquid port.
  • An accumulator comprising a cylindrical liquid tank having a liquid port and a cylindrical gas bag made of a flexible and elastic material and located with in the said tank, said gas 'bag being attached to the liquid tank at its one end and having a free hemispherical other end being at least partially thickened adjacent to said liquid port, the wall of the said gas bag being integrally provided with a circular ridge around the bottom end approximately along the border of the thickened end of and within the said gas bag.
  • An accumulator according to claim 2 wherein a guide is located at the liquid port of said tank and a spindle attached to said valve is slidably supported by said guide.

Description

ACCUMULATOR Sheet Filed Nov. 10, 1966 Feb. 18, 196% KAZUQ s M ET AL 3,428,9Q1
ACCUMULATOR Sheet Filed Nov. 10, 1866 United States Patent 40/ 81,431 US. Cl. 13830 4 Claims Int. Cl. F161 55/04 ABSTRACT OF THE DISCLOSURE An elastic gas bag accumulator is provided having at its bottom hemispherical end an inwardly projecting integral circular ridge for preventing the gas bag from sulfering a sharp reverse bend when it collapses.
This invention relates to the improvement of the gas bag of accumulators of the pressure liquid type, which consist of a rigid cylindrical pressure liquid tank, and of an elastic and flexible cylindrical gas bag, generally called a bladder, filled with gas under a certain standard pressure, and disposed within the tank.
An object of this invention is to permit the wall of the gas bag to bend with a suflicient radius around its hemispherical or lower bottom end when the gas bag is collapsed, so as to prevent the wall from being injured due to sharp bend of the wall, and thus to elongate the useful life of the gas bag.
Other objects and the nature and advantages of the instant invention will be apparent from the following description taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a cross-sectional view through one embodiment of an accumulator in accordance with the present invention;
FIGS. 23 are cross-sectional views through modified forms of accumulators in accordance with the present invention;
FIG. 4 is a partial cross-sectional view through a still further modification of accumulator;
FIG. 5 is a partial cross-sectional view showing the lower end of a prior art type of gas bag; and
FIG. 6 is a partial cross-sectional view showing through the lower end of a gas bag in accordance with the present invention.
Referring to the drawings, FIG. 1 shows a first embodiment of an accumulator in accordance with the present invention. In the drawing, 1 is the pressure oil tank of rigid material, 2 is the gas bag, whose one end is hemispherical and the other open end is flanged so as to be compressed and fixed to one end of the tank 1 by a cover and a ring nut 16, to form a gas bag, into which gas is charged through a gas valve 14, provided on the cover 15. A liquid port 5 is provided with a poppet valve 7 and its seat 6 to close and open the liquid port 5.
When this accumulator is installed in a pressure liquid system when the liquid pressure of the system is higher than the gas pressure within the gas bag, pressure liquid will flow into the liquid tank 1 through the liquid port 5 to be accumulated in the tank, with the gas bag being collapsed; and when the liquid pressure of the system drops lower than the gas pressure the collapsed gas bag will expand to discharge pressure liquid out of the tank through the liquid port. In the course of this expansion, the cylindrical gas bag inflates radially and longitudinally, and the gas bag will first touch and press against the cylindrical wall of the liquid tank, and then the hemispherical end will touch the valve 7 and finally push it downwardly against its seat 6, thus closing the liquid port 5.
3,428,091 Patented Feb. 18, 1969 In the conventional gas bag, its hemispherical end is generally reinforced by making the wall of that end thicker than that of the cylindrical wall as shown in FIG. 1, or by some other suitable means, to protect the bag from being injured by the poppet valve. Due to this thickness change, when the gas bag collapses, its cylindrical wall bends along the line where the thickness changes and is folded sharply as shown in FIG. 5. Thus the bag is injured and damaged due to this sharp reverse bend. The useful life of the gas bag is thus much shortened.
To eliminate such a sharp reverse bend, the gas bag according to the present invention has a circular ridge 11, which is integrally provided within the bag, approximately at the edge of the thickened portion of the hemispherical end of the bag as shown in FIG. 1.
When a gas bag provided with such a ridge is collapsed or deflated, its cylindrical wall collapses just outside of the ridge and bends over the ridge as shown in FIG. 6. It is clear that, due to the ridge 11, the bending angle B is much smaller than the bending angle A of the conventional bag, as shown in FIG. 6 and FIG. 5, and the gas bag suffers no sharp reverse bend so as to be overstressed and to be injured due to the fold. It has actually been proven that the present gas bag sufiers neither injury nor cracking due to bending and that its useful life is much elongated.
A few examples of embodiments of pressure liquid accumulators equipped with the gas bag of the present invention are shown in the drawings as follows:
The first embodiment FIG. 1 is an accumulator of conventional type equipped with the gas bag 2 of the present invention, which has a circular ridge 11, which is integrally provided approximately along the border of the cylindrical wall and the hemispherical end as above described.
In this embodiment, the poppet valve 7 is supported by its valve stem 8 in a valve guide 9 through a coil spring 10, which acts to open the valve 7.
The second embodiment FIG. 2 shows the second embodiment, in which like reference numerals represent the same parts as in the first embodiment. The difference between the first and second embodiments is that the gas bag 2 and the poppet valve 7 are made integral, i.e., the valve 7 is cast integral into the spherical end of the gas bag 2. In this case, the ridge 11 is provided along and above the circumference of the valve within the bag.
The valve 7, being thus equipped integral with the end of the bag 2, and the valve spindle 8 being guided by the valve guide 9 along the longitudinal center line of the accumulator, the gas bag 2, in spite of its buoyancy in the liquid, is always kept straight along the center line of the oil tank 1 even if the accumulator is installed horizontally or inclined. Here it must be mentioned that in the conventional accumulators, whose poppet valve is separated from the gas bag, the gas bag is bent due to the buoyancy when the accumulator is installed inclined or horizontally, and therefore the bag touches the wall of the liquid tank, causing friction not only to damage the gas bag but also to decrease the sensibility of absorbing hydraulic shocks of the accumulator due to the frictional resistance between the bag and the liquid tank.
The third embodiment In the third embodiment, as shown in FIG. 3, the poppet valve 7 is also integral with the gas bag 2 at its cylindrical end, and the ridge 11 is provided along and above the circumference of the valve 7, as in the second embodiment. Instead of the valve stabilizing mechanism being provided outside of the gas bag as in the second embodiment, in this third embodiment the valvestabilizal.
ing mechanism is all located inside of the gas bag 2 as shown in FIG. 3.
A tubular valve guide 9 is rigidly fixed at one of its ends to the liquid tank cover 15 within the tank 1 along its center line. Into another end of this guide 9, the valve spindle 8 provided on the upper side of the valve 7 is slidably arranged and a tension coil spring 10 is provided within the valve guide hooked at one end to the liquid tank cover 15 and at the other end to the valve spindle 8 which acts to open the valve 7.
By this arrangement, having all the valve stabilizing mechanism located within the gas bag 2, the liquid port is quite clear of any obstacles and the liquid can flow freely through the port with minimum resistance, which gives the accumulator a high sensibility both to absorb hydraulic shocks and to discharge pressure liquid promptly into the pressure liquid system.
The fourth embodiment FIG. 4 shows the fourth embodiment wherein the poppet valve 7 which has neither a valve spindle nor a guide is integrally attached to the cylindrical end of the gas bag 2.
An accumulator according to this embodiment has the same characteristics as an accumulator of the third embodiment wherein the pressure liquid can flow freely through the liquid port.
What is claimed is:
1. An accumulator, comprising a cylindrical liquid tank having a liquid port and a cylindrical gas bag made of a flexible and elastic material and located with in the said tank, said gas 'bag being attached to the liquid tank at its one end and having a free hemispherical other end being at least partially thickened adjacent to said liquid port, the wall of the said gas bag being integrally provided with a circular ridge around the bottom end approximately along the border of the thickened end of and within the said gas bag. 7
2. An accumulator according to claim 1, wherein a poppet valve is integrally embedded in the wall of the hemispherical end of said gas bag.
3. An accumulator according to claim 2, wherein a guide is located at the liquid port of said tank and a spindle attached to said valve is slidably supported by said guide.
References Cited UNITED STATES PATENTS 2,342,356 2/1944 Mercier 138-30 2,546,648 3/1951 Mercier et a1. 13830 2,604,118 7/1952 Greer 138-30 3,028,881 4/1962 Koomey et a1. 138-30 3,277,925 10/1966 Sugi-mura 138-30 3,360,009 12/1967 Elmer 138-30 ALFRED R. GUEST, Primary Examiner.
US593444A 1965-12-28 1966-11-10 Accumulator Expired - Lifetime US3428091A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570544A (en) * 1968-01-09 1971-03-16 Langen & Co Hydropneumatic pressure reservoir
US3593748A (en) * 1968-08-01 1971-07-20 Langen & Co Pressure reservoir for hydropneumatic resilient suspensions for vehicles
US3674053A (en) * 1970-06-12 1972-07-04 Hydril Co Replaceable bladder pulsation dampener
US3695298A (en) * 1971-06-01 1972-10-03 Greer Hydraulics Inc Pressure vessel
US5265942A (en) * 1990-03-12 1993-11-30 Jones Ed F Variable response fluid brake system regulators
US20070199724A1 (en) * 2004-03-12 2007-08-30 Lundgren Anders W Hydraulic Pressure Accumulator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468014A1 (en) * 1979-10-24 1981-04-30 Greer Hydraulics Inc PRESSURE TANK
FR2511444B1 (en) * 1981-08-12 1988-07-01 Christie Hydraulics Ltd IMPROVEMENTS ON HYDROPNEUMATIC ACCUMULATORS

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342356A (en) * 1938-09-13 1944-02-22 Mercier Jean Deformable or elastic accumulator
US2546648A (en) * 1948-09-30 1951-03-27 Greer Hydraulics Inc Spring controlled guide rod for the oil port valve of an accumulator
US2604118A (en) * 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
US3028881A (en) * 1960-11-17 1962-04-10 Stewart And Stevenson Distribu Pressure accumulator apparatus
US3277925A (en) * 1963-06-04 1966-10-11 Sugimura Kazuo Accumulator
US3360009A (en) * 1964-07-03 1967-12-26 Hydraulik Gmbh Hydraulic fluid accumulator having separating wall tensioner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342356A (en) * 1938-09-13 1944-02-22 Mercier Jean Deformable or elastic accumulator
US2604118A (en) * 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
US2546648A (en) * 1948-09-30 1951-03-27 Greer Hydraulics Inc Spring controlled guide rod for the oil port valve of an accumulator
US3028881A (en) * 1960-11-17 1962-04-10 Stewart And Stevenson Distribu Pressure accumulator apparatus
US3277925A (en) * 1963-06-04 1966-10-11 Sugimura Kazuo Accumulator
US3360009A (en) * 1964-07-03 1967-12-26 Hydraulik Gmbh Hydraulic fluid accumulator having separating wall tensioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570544A (en) * 1968-01-09 1971-03-16 Langen & Co Hydropneumatic pressure reservoir
US3593748A (en) * 1968-08-01 1971-07-20 Langen & Co Pressure reservoir for hydropneumatic resilient suspensions for vehicles
US3674053A (en) * 1970-06-12 1972-07-04 Hydril Co Replaceable bladder pulsation dampener
US3695298A (en) * 1971-06-01 1972-10-03 Greer Hydraulics Inc Pressure vessel
DE2226676A1 (en) * 1971-06-01 1972-12-07 Greer Hydraulics Inc Pressure vessel
US5265942A (en) * 1990-03-12 1993-11-30 Jones Ed F Variable response fluid brake system regulators
US5380074A (en) * 1990-03-12 1995-01-10 Jones; Ed F. Hydraulic brake system regulator
US20070199724A1 (en) * 2004-03-12 2007-08-30 Lundgren Anders W Hydraulic Pressure Accumulator
US7478648B2 (en) * 2004-03-12 2009-01-20 Atlas Copco Construction Tools Ab Hydraulic pressure accumulator

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GB1145557A (en) 1969-03-19

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