US3722548A - Pressure vessel - Google Patents

Pressure vessel Download PDF

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Publication number
US3722548A
US3722548A US00188971A US3722548DA US3722548A US 3722548 A US3722548 A US 3722548A US 00188971 A US00188971 A US 00188971A US 3722548D A US3722548D A US 3722548DA US 3722548 A US3722548 A US 3722548A
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US
United States
Prior art keywords
sleeve
screen assembly
support plate
base plate
plates
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
US00188971A
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English (en)
Inventor
J Mercier
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.)
EXOL Inc A CORP OF DE
MERCIER JACQUES H
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3722548A publication Critical patent/US3722548A/en
Assigned to MERCIER,JACQUES H. reassignment MERCIER,JACQUES H. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRUST NORMAND
Assigned to NORMAND TRUST THE, A TRUST OF NEW YORK CONSISTING OF ARTHUR B. COLVIN, TRUSTEE. reassignment NORMAND TRUST THE, A TRUST OF NEW YORK CONSISTING OF ARTHUR B. COLVIN, TRUSTEE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MERCIER, JACQUES H.
Assigned to EXOL, INC., A CORP OF DE. reassignment EXOL, INC., A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NORMAND TRUST THE, BY: ARTHUR B. COLVIN, TRUSTEE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/58—Large containers characterised by means facilitating filling or emptying by displacement of walls
    • B65D88/60—Large containers characterised by means facilitating filling or emptying by displacement of walls of internal walls
    • B65D88/62—Large containers characterised by means facilitating filling or emptying by displacement of walls of internal walls the walls being deformable
    • 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
    • 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
    • F15B2201/315—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
    • 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

Definitions

  • the present invention relates to a pressure reservoir comprising a rigid envelope having two ports, a flexible separator in the form of a bladder disposed in the interior of the said envelope and dividing it into two compartments for fluids which are respectively in communication with said ports, the bladder being adapted to move to the vicinity of one of the said ports, which is equipped with a strainer device or screen against which the bladder abuts in operation.
  • the screen should have perforations selected in such a way that a free circulation of the fluid will be possible without excessive loss of head, making allowance for the fact that the loss of head resulting from the passage of a fluid through a perforation is a function of the diameter and the depth or height of the perforation.
  • the perforations of the screen must be small enough so that when the bladder abuts against the screen there will be no extrusion of the bladder through the perforations with resultant injury to the bladder.
  • the screen be capable of supporting the load which is transmitted to it when the bladder abuts thereagainst.
  • This load can be substantial, for example, in the order of several tons.
  • screens associated with pressure vessels do not meet in an entirely satisfactory manner, the set of conditions set forth above.
  • the screen To support the load of several tons transmitted by the bladder, the screen must be thick, which gives the perforations a substantial depth or height and this makes for too large a loss of head, provided the diameter of the perforations is not large. But the choice of a large diameter for the perforations would result in the danger of an extrusion of the material of the bladder into these perforations, with resultant damage to the bladder.
  • the screen comprises two superposed plates; a support plate against which the bladder will abut in operation; and a base plate on which the said support plate rests, the support plate being relatively thin and provided with perforations of small diameter, while the said base plate is provided with perforations of large diameter and is convex with the convexity oriented toward the support plate.
  • the load transmitted by the bladder for example of several tons, is received by the thick base plate, while the support plate, due to its small perforations, will prevent extrusion of the bladder.
  • the losses of head are low, both through the base plate, because its perforations, which even if deep, are of large diameter, and through the support plate because its perforations, even if of small diameter, are shallow.
  • the base plate and the support plate are both convex with opposing convexities, and they are applied against one another and rigidly secured at their centers.
  • the set of two plates is encompassed by and rigidly secured to an annulus or ring member.
  • the base plate rests on a conical or beveled annular surface of the ring providing a seat analogous to a bridge abutment.
  • the base plate can be secured with respect to its bearing zone by immobilization means such as spot welds or the like.
  • the support plate can be crimped in the perimeter of the ring, or fixed in any other manner, for example, by welding.
  • the screen which is thus composed of the pre-assembled unit formed by the two plates and the ring, is positioned in the oil port of the pressure vessel and releasably secured in place.
  • safety means are provided to prevent the screen from being disassem bled accidentally.
  • These safety means may comprise a screw which is adapted to engage with the ring in such a way as to prevent the latter from being disassembled as long as the screw is not removed. This screw can advantageously serve as a drainage screw.
  • FIG. 1 is a general, diagrammatic view of a pressure vessel according to the invention
  • FIG. 2 is a detail sectional view on a larger scale of the screen associated with this pressure vessel
  • FIG. 3 is a view similar to FIG. 2 of another embodiment of the invention.
  • the pressure vessel comprises a container 10 of strong rigid material such as steel, cast aluminum or the like, capable of withstanding high pressure and having a pair of ports 13, 14 preferably axially aligned at opposed ends of the container.
  • the container illustratively has a cylindrical body portion with hemispherical ends 11, 12 through which the ports 13, 14 extend, and has a partition 18 therein, intervening between said ports l3, l4 defining a variable volume chamber 20, 21 on each side.
  • the partition 18 preferably is a collapsible and expansible bladder of resilient material such as rubber or synthetic plastic of like physical characterists, which in distended but substantially unstretched condition is smaller than the cavity of the container 10 and has its longitudinal axis aligned with the ports 13, 14.
  • the bladder 18 is securely affixed in the container 10, preferably by means of a valve stem 13' affixed to the end of the bladder and extending through the port 13, the stern being located in position by a nut 19.
  • valve stem 13' permits introduction of a fluid such as gas under pressure into the chamber 20 defined in the bladder 18 and a cap 15 is provided to cover the outer end of the valve stem 13'.
  • the port 14 is of relatively large diameter as clearly shown in FIG. 2 and a fluid such as oil under pressure is adapted to flow into said port 14 to charge the chamber 21 and such fluid also discharges from port 14.
  • the port 14 is formed by a tubular sleeve 16 integral with the container and extending axially therefrom, the inner end of sleeve 16 having an inwardly extending annular flange 32 defining a shoulder 32'.
  • the screen assembly 17 is positioned in port 14. As shown in FIG. 2, the screen assembly 17 comprises two juxtaposed plates, i.e., a relatively thick sturdy base plate 22 which has perforations 23 of relatively large diameter and a relatively thin support plate 24 which has perforations 25 of relatively small diameter.
  • the base plate 22 and support plate 24 are both convex with opposed convexities and are secured at their central point of contact as by a rivet 26 having rounded ends 27 to prevent injury to the end 18 of the bladder abutting thereagainst.
  • Encompassing the juxtaposed plates 22, 24, is an annulus or ring member 28 of rigid material, the plates being rigidly secured to the ring member 28.
  • the ring member 28 which preferably is of steel, has an annular groove 37 in its outer surface and is of reduced outer diameter at its upper end as at 28'.
  • the inner diameter of the ring 28 at its outer end 34 is of reduced diameter defining an annular conical beveled abutment surface 29.
  • the periphery of the curved base plate 22 seats on the beveled surface 29 and is preferably secured thereto as by spot welding at 30.
  • the periphery of the curved support plate 24 is seated in an annular groove 24' in the upper end 28' of ring 28 and retained in place by crimping of said upper end as at 31.
  • the screen assembly 17 is releasably retained in the sleeve 16. To this end the assembly 17 is inserted into sleeve 16 until the shoulder 35 defined by the reduced diameter portion 28' of ring 28 abuts against annular flange 32. Thereupon, a split ring 33 is positioned in an annular groove 33' in the inner surface of the sleeve 16, said split ring 33 coacting with the outer periphery of the ring 28 to retain the latter in position. Preferably, some play is provided at 35 between shoulder 32' and the adjacent portion of sleeve 28 to permit ready insertion of the retaining ring 33.
  • the outer periphery of the outer end of the ring 28 is beveled as at 34 so that when pressure is exerted against the screen assembly 17 by the force of the expanding bladder thereagainst, the ring 33 will be urged into the groove 33' dependably to retain the split ring 33 in position.
  • Means are provided to prevent removal of the screen assembly 17 while the container is charged with fluid under high pressure. More particularly, if the split ring 33 should be removed when high pressure is present in the container, if the screen assembly was free at such time, it would blow out with great force causing severe injury to the mechanic.
  • safety means comprising a screw 36 which is threaded through an associated opening 36' in the sleeve 16 into the annular groove 37 with the inner end of the screw 36 engaging the floor of the annular groove 37 and acting as a set screw. So long as the screw 36 is in position, it is apparent that even if the split ring 33 was removed, the force of the inner end against the floor of the groove 37 would prevent outward movement of the screen assembly 17 and furthermore, the upper annular shoulder defined by the groove 37 would abut against the inner end of the screw 36 if the screen assembly 17 should move outwardly to prevent complete outward movement of said screen assembly.
  • the floor of the annular groove 37 is provided with a plurality of perforations 38.
  • the mechanic should realize that he must first remove the screw 36, he would also realize that he must deflate the expanded bladder 18 to relieve the pressure. If the mechanic does not deflate the bladder 18 but does remove the screw 36, the resulting passageway provided through the perforations 38 and opening 36' in which the screw 36 is positioned will permit bleeding of fluid from the unit to relieve the pressure.
  • the load is in the order of 2.5 tons.
  • this load is supported by the thick plate 22 supported by the beveled abutments 29.
  • Due to the small perforations 25 in the support plate the bladder will not extrude so that it will not be injured.
  • the loss of head is low both through the base plate 22 and the support plate 24. This is due to the fact that the perforations 23 in the base plate though relatively long or deep are of large diameter and the perforations 25 in the support plate though of small diameter, are very shallow. As a result of such low loss of head, efficient operation both in filling and in discharge in container 10 is provided.
  • FIG. 3 The embodiment shown in FIG. 3 is similar to that shown in FIGS. 1 and 2 except that the screw 36 is replaced by a screw 36' adapted to close a port 37 in ring 28" and forming a drainage port.
  • the rivet 26, shown in FIG. 2 is replaced by a weld 26' and the crimping 31 is replaced by a weld 31 Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: j v
  • a pressure vessel comprising a rigid container having a deformable partition therein defining two chambers for fluid, said container having two ports leading respectively into said chambers, one of said chambers being adapted to receive gas under pressure and the other of said chambers being adapted to receive fluid such as oil under pressure, said port leading into said oil chamber defining an oil port of relatively large diameter, a screen assembly positioned in said oil port and extending transversely across the latter, said screen assembly comprising two juxtaposed perforated plates, one of said plates defining a support plate against which the separator is adapted to abut in operation of said pressure vessel and the other of said plates defining a base plate a portion of which is engaged by said support plate, said support plate being relatively thin as compared to said base plate, said base plate being curved and having its convex surface oriented toward said support plate, and means rigid with said container to support the periphery of said base plate.
  • said screen assembly comprises a sleeve of rigid material having an annular abutment surface adjacent one end of the bore thereof, the periphery of said base plate being seated on said annular abutment surface, the periphery of said support plate being secured to the sleeve adjacent its other end, said support plate being curved and having its convex surface oriented toward the convex surface of said base plate with the centers of said plates being secured together.
  • said screen assembly comprises a sleeve of rigid material positioned in said container sleeve, said support plate being curved and having its convex surface oriented toward the convex surface of said base plate, the centers of said plates being secured together, the peripheries of said plates being secured to the inner surface of the bore of said screen assembly sleeve at longitudinally spaced positions, and means are provided releasably to retain said screen assembly in said container sleeve.
  • said screen assembly sleeve has an elongated annular groove in its outer surface defining a restraining shoulder at one end adjacent the first annular shoulder of said screen assembly sleeve
  • said container sleeve has a transverse threaded opening and a retaining screw positioned in said threaded opening with the inner end of said screw extending into the annular groove in said screen assembly sleeve
  • the portion of the wall of said screen assembly sleeve between the secured peripheries of said plates has a passageway therethrough whereby when said screw is removed the oil in the container will bleed through the passageway and the opening in the container sleeve.
  • said deformable partition is a bladder extending axially in said container having an opening at one end secured to one of said ports and having its closed end normally spaced from said support plate, said support plate being curved having its concave surface oriented toward the closed end of said bladder and its convex surface oriented toward the convex surface of said base plate, the end of said container having the oil port having a sleeve extending axially therefrom the bore of which defines said oil port, said screen assembly comprising a rigid sleeve positioned in said container sleeve and releasably retained therein, said plates being positioned in said screen assembly sleeve and having their outer periphery secured to the inner surface of said screen assembly sleeve at longitudinally spaced positions, said screen assembly sleeve adjacent its outer end having an annular abutment surface on which the periphery of said base plate is seated.
  • a screen assembly for the oil port of a pressure vessel of the type having a deformable partition therein, said screen assembly comprising a sleeve of rigid material having an annular abutment surface formed adjacent one end thereof on the inner surface of the sleeve, a pair of juxtaposed plates positioned in said sleeve, one of said plates defining a support plate and the other of said plates defining a base plate, said two plates being curved, the periphery of said base plate being seated on said annular abutment surface, means to secure the periphery of said support plate to said sleeve adjacent the other end thereof, said support plate having its convex surface oriented toward the convex surface of said base plate with the centers of said plates being in engagement, both of said plates having perforations therethrough.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
US00188971A 1970-10-30 1971-10-13 Pressure vessel Expired - Lifetime US3722548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7039179A FR2110777A5 (zh) 1970-10-30 1970-10-30

Publications (1)

Publication Number Publication Date
US3722548A true US3722548A (en) 1973-03-27

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ID=9063535

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Application Number Title Priority Date Filing Date
US00188971A Expired - Lifetime US3722548A (en) 1970-10-30 1971-10-13 Pressure vessel

Country Status (14)

Country Link
US (1) US3722548A (zh)
JP (1) JPS5434927B1 (zh)
AT (1) AT311177B (zh)
AU (1) AU451174B2 (zh)
BE (1) BE773282A (zh)
BR (1) BR7107292D0 (zh)
CA (1) CA955499A (zh)
DE (1) DE2153899C3 (zh)
ES (1) ES396455A1 (zh)
FR (1) FR2110777A5 (zh)
GB (1) GB1357169A (zh)
IL (1) IL37804A (zh)
SE (1) SE375842B (zh)
ZA (1) ZA716939B (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186775A (en) * 1975-10-07 1980-02-05 Tozen Sangyo Co., Ltd. Water hammer shock absorber
US20140020920A1 (en) * 2012-07-17 2014-01-23 Caterpillar Inc. Flow Control Screen For Use With Hydraulic Accumulator, Hydraulic Hammer Using Same, And Manufacturing Method
US20160333895A1 (en) * 2014-01-14 2016-11-17 Hydac Technology Gmbh Hydraulic accumulator
US20210199227A1 (en) * 2019-12-27 2021-07-01 Performance Pulsation Control, Inc. Bladder saver device
CN114658947A (zh) * 2022-03-15 2022-06-24 德帕姆(杭州)泵业科技有限公司 一种阻尼器及液压设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485653A1 (fr) * 1980-06-27 1981-12-31 Missioux Jean Leon Crepine guide-filets pour accumulateurs oleopneumatiques " anti-belier "
DE102011111098A1 (de) 2011-08-19 2013-05-16 Hydac Technology Gmbh Druckbehälter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259147A (en) * 1964-10-12 1966-07-05 Mercier Olaer Patent Corp Pressure vessel
US3333600A (en) * 1963-07-04 1967-08-01 Mercier Olaer Patent Corp Hydraulic pressure vessel system
US3379216A (en) * 1964-11-16 1968-04-23 Mercier Olaer Patent Corp Pressure vessel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659391A (en) * 1946-07-02 1953-11-17 Berger Maurice Pierre Pneumatic accumulator
US2886064A (en) * 1954-02-17 1959-05-12 Mercier Jean Accumulator construction
DE1221061B (de) * 1958-04-21 1966-07-14 Applic Mach Motrices Einrichtung zum Daempfen von Druckstoessen in Fluessigkeitsleitungen mit einer ein Gasvolumen einschliessenden elastischen Blase
FR1439891A (fr) * 1965-02-04 1966-05-27 Citroen Sa Andre Perfectionnements apportés aux dispositifs à membrane élastique soumise à une pression gazeuse sur l'une de ses faces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333600A (en) * 1963-07-04 1967-08-01 Mercier Olaer Patent Corp Hydraulic pressure vessel system
US3259147A (en) * 1964-10-12 1966-07-05 Mercier Olaer Patent Corp Pressure vessel
US3379216A (en) * 1964-11-16 1968-04-23 Mercier Olaer Patent Corp Pressure vessel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186775A (en) * 1975-10-07 1980-02-05 Tozen Sangyo Co., Ltd. Water hammer shock absorber
US20140020920A1 (en) * 2012-07-17 2014-01-23 Caterpillar Inc. Flow Control Screen For Use With Hydraulic Accumulator, Hydraulic Hammer Using Same, And Manufacturing Method
US9278442B2 (en) * 2012-07-17 2016-03-08 Caterpillar Inc. Flow control screen for use with hydraulic accumulator, hydraulic hammer using same, and manufacturing method
US20160333895A1 (en) * 2014-01-14 2016-11-17 Hydac Technology Gmbh Hydraulic accumulator
US9951796B2 (en) * 2014-01-14 2018-04-24 Hydac Technology Gmbh Hydraulic accumulator
US20210199227A1 (en) * 2019-12-27 2021-07-01 Performance Pulsation Control, Inc. Bladder saver device
US11885454B2 (en) * 2019-12-27 2024-01-30 Performance Pulsation Control, Inc. Bladder saver device
CN114658947A (zh) * 2022-03-15 2022-06-24 德帕姆(杭州)泵业科技有限公司 一种阻尼器及液压设备

Also Published As

Publication number Publication date
AU451174B2 (en) 1974-08-01
BR7107292D0 (pt) 1973-04-05
DE2153899C3 (de) 1982-04-08
AT311177B (de) 1973-11-12
DE2153899A1 (de) 1972-05-04
BE773282A (fr) 1972-01-17
GB1357169A (en) 1974-06-19
ZA716939B (en) 1972-07-26
DE2153899B2 (de) 1980-04-24
ES396455A1 (es) 1975-02-01
JPS5434927B1 (zh) 1979-10-30
SE375842B (zh) 1975-04-28
AU3481471A (en) 1973-05-03
IL37804A0 (en) 1971-11-29
IL37804A (en) 1973-06-29
CA955499A (en) 1974-10-01
FR2110777A5 (zh) 1972-06-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MERCIER,JACQUES H., 180 GLENBROOK RD., UNIT 61, ST

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRUST NORMAND;REEL/FRAME:003929/0802

Effective date: 19811109

AS Assignment

Owner name: NORMAND TRUST THE, 420 LEXINGTON AVE., NEW YORK, N

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MERCIER, JACQUES H.;REEL/FRAME:003938/0046

Effective date: 19811109

AS Assignment

Owner name: EXOL, INC., A CORP OF DE.,DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NORMAND TRUST THE, BY: ARTHUR B. COLVIN, TRUSTEE;REEL/FRAME:004648/0289

Effective date: 19861223

Owner name: EXOL, INC., 229 SO. STATE STREET, DOVER, DE., 1990

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NORMAND TRUST THE, BY: ARTHUR B. COLVIN, TRUSTEE;REEL/FRAME:004648/0289

Effective date: 19861223