US3216443A - Multiple spool valve assembly - Google Patents

Multiple spool valve assembly Download PDF

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Publication number
US3216443A
US3216443A US264121A US26412163A US3216443A US 3216443 A US3216443 A US 3216443A US 264121 A US264121 A US 264121A US 26412163 A US26412163 A US 26412163A US 3216443 A US3216443 A US 3216443A
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United States
Prior art keywords
spool
passage
passages
bores
fluid
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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
US264121A
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English (en)
Inventor
Herbert H Schmiel
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.)
Parker Hannifin Corp
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Parker Hannifin Corp
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Publication date
Application filed by Parker Hannifin Corp filed Critical Parker Hannifin Corp
Priority to US264121A priority Critical patent/US3216443A/en
Priority to GB6985/64A priority patent/GB1048614A/en
Priority to BE644283D priority patent/BE644283A/xx
Priority to NL6402442A priority patent/NL6402442A/xx
Application granted granted Critical
Publication of US3216443A publication Critical patent/US3216443A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/5109—Convertible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y10T137/7764—Choked or throttled pressure type
    • Y10T137/7766—Choked passage through main valve head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass
    • Y10T137/87185—Controlled by supply or exhaust valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making

Definitions

  • the present invention relates generally as indicated to a multiple spool valve assembly for controlling the operation of a corresponding number of fluid motors.
  • valve housings for correspondingly different fluid circuits.
  • the so-called parallel circuit any one or more or all valve spools of the assembly may be operated at will to control the respective fluid motors
  • the so-called series-parallel circuit only one valve spool at a time may be operated to control its respective fluid motor
  • FIG. 1 is a cross-section View of a multiple spool valve assembly according to the present invention, such section having been taken substantially along the line 11, FIG. 2;
  • FIG. 2 is a side elevation view as viewed from the right-hand side of FIG. 1;
  • FIG. 3 is a cross-section view taken substantially along the line 3-3, FIG. 2, showing the coring arrangement for the housing to provide for series-parallel operation;
  • FIG. 4 is a cross-section view corresponding to FIG. 3, except illustrating modification of the housing to provide for parallel operation;
  • FIG. 5 is a crosssection View also corresponding to FIG. 3 showing yet another modification of the housing to provide for parallel operation of two spools and seriesparallel operation of the third spool with respect to the first two spools;
  • FIG. 6 is a fragmentary cross-section view illustrating a reconversion plug arrangement whereby to enable reconversion of the FIG. 4 arrangement to that of FIG. 5, or of the FIG. 4 or FIG. 5 arrangements to the seriesparallel operation of FIG. 3.
  • the multiple spool valve assembly 1 is herein shown by way of example as comprising three four-way open center valve spools 2a, 2b, 2c reciprocable in parallel bores 3a, 3b, 3c in the unitary housing 4 for controlling a corresponding number of double acting fluid motors 5a, 5b, 50.
  • the three spool bores 3a, 3b, 3c are each intersected axially therealong starting at the middle thereof by a central wishbone bypass passage 6 which communicates the inlet port 7 with the tank port 8 when all three spools 2a, 2b, 2c are in neutral position as shown in FIG.
  • the housing 4 is provided with yet another bore 12 which is parallel to the spool bores and which intersects the inlet port 7 for mounting of a relief valve'assembly 14 therein.
  • the relief valve assembly 14 is of the pilot operated type in which, when the pressure in the inlet port 7 and in the chamber 15 behind the main relief valve member 16 exceeds the force exerted by the spring 17 against the pilot valve member 18 causes the latter to be forced away from its seat to bleed the fluid from the chamber 15 into the left tank passage 11 faster than fluid can be replenished through the main valve orifice 19, whereupon the pressure in the inlet port 7 acting on the area of the main valve member 16 forces it away from its seat against spring 20, whereby excess pressure in the inlet port 7 is released through the seat member 21 into the right tank passage 11.
  • valve spools 2a, 2b, 2c are shown as being of identical form, namely, four-way open center type for causing the pistons in the respective fluid motors 5a, 5b, 50 to be operated in one direction or the other in response to shifting of the respective spools 2a, 2b, 2c in one direction or the other from the neutral positions shown in FIG. 1.
  • each spool 2a, 2b, 20 has alternate lands and grooves, and is held in the neutral position of FIG. 1 by the spring centering mechanism 23 associated with one end thereof.
  • FIG. '1 To the extent that the coring of the housing 4 is illustrated in FIG. '1, it is exactly the same in all of the modifications shown, the sole differences being in the plane 33 on which the FIGS. 3, 4, and 5 are based, and these differences are in drilled passages for conversion of the FIG. 3 housing to that of FIG. 4 or FIG. 5, as desired.
  • the passages 6e, 92, 10a and 11e are lateral extensions of the respective wishbone portions of bypass 6 upstream of the respective spool bores 3a, 3b, 3c, of the respective pressure feed passages 9a, 9b, 9c, of the respective motor passages 10a, 10b, 10c, and of the tank passages 11.
  • FIG. 3 embodiment of the housing 4 as originally cored and finished, provides for series-parallel operation, that is, only one valve spool 2a, 2b, or 2c may be operated at a time since the bypass 6 from which it receives fluid under pressure must be open upstream thereof.
  • the third spool 20 when shifted from neutral position to one of its operating positions closes the aforesaid bypass 6 and in order for pressure to build up in the bypass 6 and associated extension 6e which communicates with the upstream portions of bypass 6, spools 2a, and 2b must remain in neutral position.
  • the first spool 2a must at that time be in neutral position so that fluid under pressure may build up in the inlet port 7 and in the associated portion 6e of the bypass 6 which is immediately upstream of the second spoo'l 2b.
  • the left pressure feed passage 9a, 9b, or 96 is placed in communication with the left motor passage 10a, 10b, or 100, whereupon fluid under pressure flows from the inlet port 7 through the associated left check valve member 27a, 27b, or 27c to move the piston in the associated fluid mot-or a, 5b, or 5c in one direction.
  • the right motor passage a, 10b, or 10c is communicated with the right tank passage 11 for flow of displaced fluid through tank port 8 to a suitable tank or reservoir.
  • the right pressure feed port passage 9a, 9b, or 90 is in fluid communication with the associated right motor passage 10a, 1%, or 100 whereby fluid flows from the inlet port 7 and bypass passage 6 and extension 6e through the associated check valve member 27a, 27b, or 270 to cause the piston in the associated motor 5a, 5b, or 5c to be moved in the opposite direction with fluid displaced from the motor flowing to the tank port 8 via the left motor passage 10a, 10b, or 100 which is now in fluid communication with the left tank passage 11.
  • the check valves 27a, 27b, 27c herein serve as load checks to prevent load dropping, or back flow of fluid in case the fluid pressure in the inlet port 7 is less than in the associated pressure feed and motor passages 9a, 9b, 9c and 10a, 10b, 10c.
  • FIG. 4 it is to be noted that the coring of the housing 4 is exactly the same as in FIGS. 1 and 3, and the only thing that has to be done to provide for a full parallel circuit wherein the spools 2a,
  • 2b, 2c may be operated independently or simultaneously any two or three at a time.
  • a hole 30 which extends between the pairs of bypass passage extensions 6e and bores 31a, 31b, 310 from the check valve bores 25a, 25b, 25c intersecting hole 30.
  • a sleeve member 32b, 32c Inserted in each bore 31b and 310 is a sleeve member 32b, 32c which constitutes a seat for the associated check valve member 27b, 27c and which isolates the associated bypass passage extension 6e from both the bore 30 and the adjacent pressure feed passage 9e.
  • the extensions 6e for spool 2a, and the bore 30 (via bores 31a and sleeve members 32b and 320) become an inlet passage for feeding fluid under pressure from the inlet port 7 to the pressure feed passage extensions 9e for operation of the respective spools 2a, 2b, 2c, either independently, or simultaneously with one or two of the others.
  • the bore 30 is closed as by threaded plug 33.
  • the bypass 6 when it is operated, the bypass 6 through it is closed and pressure builds up in one or the other of the bypass passage extensions 6e to supply fluid under pressure to one or the other of the pressure feed passages 9a (via 9e and check valve member 27a therein) to cause actuation of the fluid motor 5a in one direction or the other.
  • pressure through openings 31a, also builds up in the bore 39, but if neither the second nor third spools 2b, 2c are operated, the check valve members 27b, 270 are not open.
  • the three spools 2a, 2b, 2c can be operated one at a time, any two at a time, or all three at a time, by the simple expedient of merely providing the drilled hole 30 and the cross bores 31a, 31b, 31c of which the second and third ones viz, 31b and 31c have tubular inserts 32b and 32c therein.
  • the first and second spools 2a and 2b are in parallel arrangement by providing the bore 30 which extends between the bypass extensions 6e of the first and second spools 2a and 2b and again drilling through as at 31a, 31b, and providing the tubular inserts 32b which may be identical in structure and function to those described in relation to FIG. 4.
  • the check valve bores 250 for the third spool 2c are left exactly as they were in FIG. 3.
  • first and second spools 2a and 2b may be operated independently or simultaneously, but since the third spool receives fluid under pressure only from the bypass 6 and bypass extensions 6e, it can be operated only when the first and second spools 2a and 2b are in neutral position with the common bypass 6 open so that fluid under pressure Will build up in the inlet port 7 and in the bypass passage 6 up to the third spool 20 for flow through the selected check valve member 27c.
  • the FIG. 4 parallel circuit can be reconverted or changed to the FIG. 5 circuit'simply by providing plugs 40 in place of the sleeves 32a to seal off the bypass passage extensions 62 with the bore 30, and to provide seats for check valve members 270 between the bypass passage extensions 6e and the respective pressure feed extensions 9e, said plugs 40 having openings 41 for flow of fluid from 6e to 9e. Going a step further, the FIG. 5 arrangement then can be reconverted back to FIG. 3 by providing plugs 40 in association with the bores 31b and with enlarged bores 31a. Of course, the FIG. 4 arrangement similarly may be reconverted to the FIG. 3 arrangement by using the plugs 40 in place of sleeves 32b and 32c and in enlarged bores 31a. Furthermore, by
  • selective use of the plugs 40 and sleeves 32 the FIG. 4 arrangement can be such that the first and third spools 2a and 2c may be operated in parallel one or both at a time, but with the second spool 2b operative only when the first spool is in neutral position. Numerous other arrangements can obviously be provided.
  • the present invention requires the making of only one basic housing casting 4 which has the same coring regardless of the ultimate circuit arrangement, whether series-parallel, parallel, or a combination of them.
  • castings 4 can be made for stock or inventory, and finished to the extent shown in FIGS. 1 and 3, whereupon assembly may be readily completed for FIG. 3 series-parallel operation, or quickly and easily converted for parallel and other operation simply by drilling or boring holes and 31a, 31b and/or 310 and installing the tubular inserts 32b and/or 32c.
  • the provision of plugs 40, or in fact, plugs in the drilled hole 30, the housing 4 may be reconverted.
  • all three spools 2a, 2b, 2c are of the four-way open center type, it is to be understood that one, two, or three three-way spools may be substituted for operating a corresponding number of single acting fluid motors with one of the motor ports plugged or left undrilled.
  • one or more of the spools may be of the four-way float type which has in addition to the two operating positions provided in the four-way spools here shown, another operating position, a so-called float position in which the motor ports are placed in fluid communication with one another and with a tank port (usually with restricted communication to build up some pressure but at the same time to preclude cavitation of the motor, as when the piston therein floats or moves toward its rod end.)
  • the hole 30 may be provided in housing 4 as cast and left open at its lower end if finished as in FIG. 3. However, if the housing 4 is finished as in FIGS. 4 or 5, the lower end of cored hole 30 need only be counterbored and tapped for the plug 33, and the openings 31a, and 31b and/or 31c provided for sleeves 32b and/or 320.
  • a housing for a spool valve assembly having (a) at least two spool bores for reciprocation of valve spools therein,
  • said housing further having additional passages connecting the pressure end of said bypass passage with at least one pressure feed passage of the downstream spool bore, and at least one sleeve means inserted in one of said additionalpassages operative to isolate the pressure feed extension of said downstream spool bore from said bypass passage except through said additional passages, whereby valve spools in said spool bores may be selectively operated one at a time or simultaneously to control the respective motors.
  • valve spools in said first two spool bores may be operated either selectively or simultaneously as aforesaid, but a valve spool in said another spool bore may be operated only when the first two spool bores are inoperative.
  • the housing of claim 1 further including another spool bore downstream of said first two spool bores for reciprocation of a valve spool therein, said bypass passage also intersecting said another spool bore, at least one other pressure feed passage intersecting said another spool bore and having an extension communicating with said bypass passage upstream of said another spool bore, at least one other motor passage intersecting said another spool bore for connection with another fluid motor, said return passages also intersecting said another spool bore, wherein said additional passages also connect the pressure end of said bypass passage with the pressure feed passage of said another spool bore, a sleeve means is inserted in one of said additional passages operative to isolate the pressure feed extension of one of said downstream spool bores from said bypass passage except through said additional passages, and a removable plug means is inserted in another of said additional passages operative to block fluid communication between said additional passages and the pressure feed extension of the other of said downstream spool bores, whereby valve spools in the upstream spool bore and in the
  • a spool valve assembly comprising a housing having (a) at least two parallel spool bores for reciprocation of valve spools therein,
  • valve spool reciprocable in each spool bore from a neutral position whereat fluid flows through said bypass passage from one end to the other and fluid communication between said pressure feed and motor passages and between said return and motor passages is blocked thereby to an operating position whereat said bypass passage is blocked thereby and said pressure feed and motor passages are in fluid communication via the respective upstream extensions of said bypass and pressure feed passages for flow of fluid under pressure therethrough;
  • said housing laterally of said spool bores, being provided with additional passages intercommunicating the end of said bypass passage that is adapted for connection with a fluid pressure source with said lateral extension of the pressure feed passage of the downstream spool bore, and sleeve means in one of said additional passages operative to isolate the pressure feed passage extension of the downstream spool bore from its associated bypass passage extension, whereby said spools may be selectively operated either one at a time or simultaneously.
  • a spool valve assembly comprising a housing having at least two parallel spool bores which are intersected axially therealong starting from the middle by (a) a bypass passage having a pair of lateral extensions upstream from the respective spool bores, said bypass passage being adapted for connection with a fluid pressure source and with a fluid reservoir at its respective ends,
  • said housing laterally of said spool bores, having connecting passages between said bypass lateral extensions and the adjacent pressure feed lateral extensions, valve spools selectively reciprocable in the respective spool bores from a neutral position whereat said bypass passage is open successively via said spool bores from one end to the other, and said motor passages are blocked thereby from the adjacent pressure feed and return passages, to at least one operating position whereat said bypass passage is closed thereby and one of said motor passages is intercommunicated with the adjacent pressure feed passage via the upstream lateral extensions of the associated feed and bypass passages, said housing, between the pairs of bypass lateral extensions, being provided with passage means which are in communication with only one pair of said bypass lateral extensions, and are in communication with both pairs of pressure feed lateral extensions, communication between the other pair of bypass lateral extensions and said passage means being blocked by sleeve means disposed in said passage means adjacent said bypass lateral extensions, said sleeve means also blocking communication between said other pair of bypass lateral extensions and the associated pressure feed lateral extensions,
  • a multiple spool valve assembly for controlling operation of a corresponding number of fluid motors, comprising a housing having an inlet port for connection with a fluid pressure source, a return port for connection with a fluid reservoir, and motor ports for connection with said fluid motors; at least two spool bores in which there are disposed valve spools selectively reciprocable in said housing to control operation of the respective motors; said housing having at least one pair of passages extending from each of said spool bores, one of said passages of each pair being in communication with a motor port upon movement of its associated valve spool to an operative position, the other passage of each pair being in communication with said inlet port upstream of the respective spool bores via a bypass passage leading from said inlet port to said return port and intersecting said spool bores, each pair of passages having a connecting passage therebetween for flow of fluid therethrough from said inlet port to the motor port of the selectively operated spool, said housing also including a first passage, a second passage communicating said first passage with

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
  • Hydraulic Motors (AREA)
US264121A 1963-03-11 1963-03-11 Multiple spool valve assembly Expired - Lifetime US3216443A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US264121A US3216443A (en) 1963-03-11 1963-03-11 Multiple spool valve assembly
GB6985/64A GB1048614A (en) 1963-03-11 1964-02-19 Multiple spool valve assembly for controlling fluid motors
BE644283D BE644283A (nl) 1963-03-11 1964-02-25
NL6402442A NL6402442A (nl) 1963-03-11 1964-03-10

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Application Number Priority Date Filing Date Title
US264121A US3216443A (en) 1963-03-11 1963-03-11 Multiple spool valve assembly

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US3216443A true US3216443A (en) 1965-11-09

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BE (1) BE644283A (nl)
GB (1) GB1048614A (nl)
NL (1) NL6402442A (nl)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376892A (en) * 1966-03-04 1968-04-09 Parker Hannifin Corp Directional control valve
US3409041A (en) * 1966-02-18 1968-11-05 Parker Hannifin Corp Directional control valve
US3476214A (en) * 1968-02-01 1969-11-04 Mccord Corp Divisional lubricant feeder with bypass means
DE2152012A1 (de) * 1970-10-20 1972-04-27 Komatsu Mfg Co Ltd Umschaltventil
US3952771A (en) * 1975-01-08 1976-04-27 Zahnradfabrik Friedrichshafen Ag Relief valves with pilot valves
US3976098A (en) * 1974-01-02 1976-08-24 International Basic Economy Corporation Hydraulic motor control apparatus
US4167197A (en) * 1970-10-20 1979-09-11 Toshio Maki Directional change-over valve
US4570672A (en) * 1983-06-13 1986-02-18 Koehring Company Hydraulic control valve with independently operable bypass valve
EP0361643A1 (en) * 1988-09-30 1990-04-04 Sanyo Kiki Kabushiki Kaisha Multi-stage selector valve
US5471839A (en) * 1989-03-24 1995-12-05 Hitachi Construction Machinery Co., Ltd. Valve apparatus and hydraulic drive system
US20150377370A1 (en) * 2014-06-25 2015-12-31 Parker-Hannifin Corporation Reverse flow check valve in hydraulic valve with series circuit
US20190072115A1 (en) * 2016-06-29 2019-03-07 Kyb Corporation Fluid pressure control device
US10323659B2 (en) * 2017-05-16 2019-06-18 Parker-Hannifin Corporation Open center control valve
US11460053B2 (en) * 2020-03-16 2022-10-04 Parker-Hannifin Corporation Open center control valve configured to combine fluid flow received from multiple sources

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3522955A1 (de) * 1985-06-27 1987-01-08 Festo Kg Anordnung von ventilgehaeusen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000397A (en) * 1959-08-24 1961-09-19 Parker Hannifin Corp Valve assembly
US3077901A (en) * 1960-06-27 1963-02-19 Vickers Inc Divided flow, control valve system
US3106065A (en) * 1961-02-13 1963-10-08 Parker Hannifin Corp Position hold and release mechanisms for flow control valves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000397A (en) * 1959-08-24 1961-09-19 Parker Hannifin Corp Valve assembly
US3077901A (en) * 1960-06-27 1963-02-19 Vickers Inc Divided flow, control valve system
US3106065A (en) * 1961-02-13 1963-10-08 Parker Hannifin Corp Position hold and release mechanisms for flow control valves

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409041A (en) * 1966-02-18 1968-11-05 Parker Hannifin Corp Directional control valve
US3376892A (en) * 1966-03-04 1968-04-09 Parker Hannifin Corp Directional control valve
US3476214A (en) * 1968-02-01 1969-11-04 Mccord Corp Divisional lubricant feeder with bypass means
DE2152012A1 (de) * 1970-10-20 1972-04-27 Komatsu Mfg Co Ltd Umschaltventil
US4167197A (en) * 1970-10-20 1979-09-11 Toshio Maki Directional change-over valve
US3976098A (en) * 1974-01-02 1976-08-24 International Basic Economy Corporation Hydraulic motor control apparatus
US3952771A (en) * 1975-01-08 1976-04-27 Zahnradfabrik Friedrichshafen Ag Relief valves with pilot valves
US4570672A (en) * 1983-06-13 1986-02-18 Koehring Company Hydraulic control valve with independently operable bypass valve
EP0361643A1 (en) * 1988-09-30 1990-04-04 Sanyo Kiki Kabushiki Kaisha Multi-stage selector valve
US5471839A (en) * 1989-03-24 1995-12-05 Hitachi Construction Machinery Co., Ltd. Valve apparatus and hydraulic drive system
US20150377370A1 (en) * 2014-06-25 2015-12-31 Parker-Hannifin Corporation Reverse flow check valve in hydraulic valve with series circuit
US10024445B2 (en) * 2014-06-25 2018-07-17 Parker-Hannifin Corporation Reverse flow check valve in hydraulic valve with series circuit
US10619750B2 (en) 2014-06-25 2020-04-14 Parker-Hannifin Corporation Reverse flow check valve in hydraulic valve with series circuit
US20190072115A1 (en) * 2016-06-29 2019-03-07 Kyb Corporation Fluid pressure control device
US10323659B2 (en) * 2017-05-16 2019-06-18 Parker-Hannifin Corporation Open center control valve
US10502240B2 (en) 2017-05-16 2019-12-10 Parker-Hannifin Corporation Open center control valve
US11460053B2 (en) * 2020-03-16 2022-10-04 Parker-Hannifin Corporation Open center control valve configured to combine fluid flow received from multiple sources

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Publication number Publication date
GB1048614A (en) 1966-11-16
NL6402442A (nl) 1964-09-14
BE644283A (nl) 1964-08-25

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