US3746040A - Directional control valve - Google Patents

Directional control valve Download PDF

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Publication number
US3746040A
US3746040A US00245451A US3746040DA US3746040A US 3746040 A US3746040 A US 3746040A US 00245451 A US00245451 A US 00245451A US 3746040D A US3746040D A US 3746040DA US 3746040 A US3746040 A US 3746040A
Authority
US
United States
Prior art keywords
motor
port
spool
groove
return
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
US00245451A
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English (en)
Inventor
J Paul
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 Intangibles LLC
Original Assignee
Parker Hannifin Corp
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 Parker Hannifin Corp filed Critical Parker Hannifin Corp
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Publication of US3746040A publication Critical patent/US3746040A/en
Assigned to PARKER INTANGIBLES INC., A CORP. OF DE reassignment PARKER INTANGIBLES INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PARKER-HANNIFIN CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
    • 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
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
    • 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

Definitions

  • ABSTRACT A four-way spool valve assembly embodying a regenerative circuit for controlling the actuation of a double acting fluid motor for a bulldozer blade or the like characterized in that the spool has therewithin a relief valve and a check valve respectively operative to build up back pressure in the return line from the rod end of the motor during the blade lowering operation and to permit return flow under ,such back pressure into the inlet port to prevent cavitation of the head end of the motor, and further characterized in that the spool has a float position in which a bypass passage in the assembly is open for flow of fluid from the inlet passage to the return passage and in which both motor ports have unrestricted communication with the return passage.
  • the directional control valve assembly 1 herein shown comprises a housing 2 having a pressure inlet port 3 adapted for connection with a pump 4, a return port 5 adapted for connection with a tank 6, and a pair of motor ports 7;7 adapted for connection with a double acting fluid motor 8.
  • the housing 2 is of conventional form having a bore 9 therethrough for a spool 10, said bore 9 being intersected axially therealong starting from the middle by a bypass passage portion 11 which leads to the return port 5, said bypass portion 11 being straddled by bypass portions 12;l2 leading to the inlet port 3, a pairof pressure feed passages 14,14 which straddle the aforesaid bypass portions I2;l2 and of which the lower passage 14 communicates with the inlet port 3 via load check valve 15, a pair of motor passages, l6;l6 which straddle the pressure feed passages I4;14 and which lead to the respective motor ports 7;7, and a pair of return passages 17;17 which straddle the motor passages l6;l6 and which lead to the return port 5. Between the inlet port 3 and one return passage 17 is the main relief valve 13.
  • a relief valve member 23 which is actuated to seated position by the spring 24 and which is operative to maintain a predetermined back pressure in the regeneration path hereinafter to be described when the spool 10 is in LOWER position, said relief valve member 23, when actuated by pressure exceeding the predetermined back pressure, opening a first passage constituted by the openings 25, the bore 26, and the holes 27 which then register with the upper return passage 17, to relieve excess pressure to the return passage 17.
  • the upper load check valve 15 is disposed between the upper feed passage 14 and the upper motor passage 16 and hence when the spool 10 is shifted to RAISE position fluid under pressure will be conducted to the upper motor passage via the openings 28 in upper land 20, bore 29, openings 25, upper feed passage 14, and upper load check valve 15.
  • a check valvemember 30 which is urged to seated position by the spring 31 and which is operative when the spool 10 is in LOWER position to open a second passage in the regeneration path which is constituted by the openings 25, the bore 29, and the openings 32 for flow of fluid into the lower bypass passage portion 12 to supplement the fluid delivered by the pump 4 thus to prevent cavitation when the spool is in its power LOWER" position. This provides for fast lowering of the blade 21 to ground engaging position.
  • the spool 10 When it is desired to lower the boom 22 with the blade 21 firmly engaging the ground as aforesaid, the spool 10 is shifted upwardly from NEUTRAL position to LOWER position, whereat the spool lands 34 and 20 close communication between the bypass por- -tions 12 and 11 for flow of fluid under pressure delivered by the pump through the lower check valve to the lower pressure feed passage 14 and thence to the lower motor passage 16 via the spool groove 35 whereby fluid under pressure is conducted into the head end of the motor 8 to move the boom 22 and blade 21 downwardly.
  • Oil displaced from the rod end of the motor 8 flows into the upper motor passage 16 and because of the closed position of the relief valve member 23 pressure builds up in the upper motor passage 16 and effects unseating of the check valve member 30, whereby the fluid returning to the valve assembly 1 from the rod end of the motor 8 is conducted into the inlet port 3 to supplement the pump 4 output, thus to achieve rapid lowering of the boom under power control and without permitting cavitating of the head end of the motor 8.
  • the spool 10 When it is desired to raise the boom 22 and blade 21, the spool 10 is shifted downwardly from NEUTRAL position to RAISE position whereat the spool lands 34 and block communication between the bypass portions 12 and 11 with fluid under pressure in the inlet port 3 being conducted through openings 28, bore 29, openings 25, upper feed passage 14, and upper check valve 15 into the upper motor passage 16 for flow into the rod end of the motor 8. Fluid displaced from the head end of the motor 8 is conducted to the lower motor passage 16 and to the lower return passage 17 via the spool groove 35. When the force on the spool 10 is released, the spring centering mechanism 18 will return the spool 10 from the RAISE position back to "NEUTRAL" position.
  • the boom 22 and blade 21 may float up or down, the lower motor passage 16 being communicated with the lower return passage 17 by way of the spool groove 37, and the upper motor passage 16 being communicated with the upper return passage 17 by way of the spool groove 38.
  • the bypass passage 12-11 is open as shown.
  • a spool valve assembly having a housing including a pressure inlet port, a return port, and a pair of motor ports; a valve spool movable in said housing to control actuation of a double acting fluid motor adapted to be connected to said motor ports and having first and second grooves respectively communicating one motor port selectively with said inlet port and said return port and the other motor port with said inlet port when said one motor port is communicated with said return port via said first groove; said valve spool, in addition to said grooves, having first and second passages therein respectively communicating said other motor port with said return port and with said inlet port when said one motor port is communicated with said inlet port; a relief valve in said first passage to build up back pressure in returning fluid in said other motor port; and a check valve in said second passage permitting returning fluid flow into said inlet port in the event of decrease of fluid pressure in said inlet port to a value less than the back pressure in said other motor port when said spool is in a position communicating said inlet port with said one motor port
  • valve assembly of claim 1 wherein said housing passage has another check valve therein to prevent reverse flow of fluid therethrough.
  • valve assembly of claim 1 wherein said valve spool has a float position whereat both motor ports are communicated with said return port via said second groove and via a third groove in said spool "adjacent to said first groove.
  • valve assemblyof claim 3 wherein said first and second passages, downstream of said relief and said check valve, terminate in openings through other spool lands adjacent to said second groove and said first groove to communicate respectively with said return port and inlet port when said spool is in a position communicating said inlet port with said one motor port.
  • a spool valve assembly having a hosuing including a pressure inlet port, a return port, and a pair of motor ports; and a valve spool movable in said housing to two operating positions to control actuation of a double acting fluid motor adapted to be connected to said motor ports and having first and second grooves selectively communicating said motor ports with said inlet and return ports; the improvement which comprises a valve spool having a third groove adjacent to said first groove operative in conjunction with said first groove to communicate each motor port with said return port upon movement of said valve spool to a third operating position whereby the movable component of the fluid motor may float in opposite directions; said spool being hollow and having openings thereinto through a land adjacent to said second groove to communicate with said inlet port and through said second groove; and said housing having a passage communieating said second groove with said other motor port when said spool is in a position communicating said one position whereat one motor port is freely communicated with said return port via said second groove and the other motor port is freely

Landscapes

  • 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)
  • Operation Control Of Excavators (AREA)
US00245451A 1972-04-19 1972-04-19 Directional control valve Expired - Lifetime US3746040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24545172A 1972-04-19 1972-04-19

Publications (1)

Publication Number Publication Date
US3746040A true US3746040A (en) 1973-07-17

Family

ID=22926711

Family Applications (1)

Application Number Title Priority Date Filing Date
US00245451A Expired - Lifetime US3746040A (en) 1972-04-19 1972-04-19 Directional control valve

Country Status (7)

Country Link
US (1) US3746040A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4920722A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA988392A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2318845A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2181018B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1420417A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT982728B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185092A (en) * 1986-01-08 1987-07-08 Trans Nordic Hydraulics Limite Directional control spool valve
FR2593265A1 (fr) * 1986-01-17 1987-07-24 Rexroth Sigma Distributeur de fluide hydraulique sous pression
EP0232014A3 (en) * 1986-01-31 1989-11-08 Moog Inc. Energy-conserving servomechanisms
US5168705A (en) * 1990-03-05 1992-12-08 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system
US5992454A (en) * 1998-07-21 1999-11-30 Eaton Corporation Lower and float capability in four position control valve
US6116143A (en) * 1996-07-05 2000-09-12 Parker Hannifin Gmbh Controller for a fluid cylinder
EP2944828A4 (en) * 2013-08-19 2016-11-02 Jiangsu Hengli Hydraulic Co Ltd ENGINEERING HYDRAULIC CONTROL VALVE
EP3444484A1 (en) * 2017-08-03 2019-02-20 Kabushiki Kaisha Toyota Jidoshokki Hydraulic driving device of industrial vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156951B (en) * 1984-04-06 1987-10-14 Trans Nordic Limited Directional control spool valve
FR2753250B1 (fr) * 1996-09-10 1998-11-13 Rexroth Sigma Distributeur hydraulique a tiroir en plusieurs parties

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965133A (en) * 1959-01-08 1960-12-20 New York Air Brake Co Valve
US3482600A (en) * 1968-03-04 1969-12-09 Commercial Shearing Hollow slide valves

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949097A (en) * 1957-12-11 1960-08-16 New York Air Brake Co Five position control valve having power float position

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965133A (en) * 1959-01-08 1960-12-20 New York Air Brake Co Valve
US3482600A (en) * 1968-03-04 1969-12-09 Commercial Shearing Hollow slide valves

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185092A (en) * 1986-01-08 1987-07-08 Trans Nordic Hydraulics Limite Directional control spool valve
GB2185092B (en) * 1986-01-08 1990-07-04 Trans Nordic Hydraulics Limite Directional control spool valve
FR2593265A1 (fr) * 1986-01-17 1987-07-24 Rexroth Sigma Distributeur de fluide hydraulique sous pression
EP0230392A1 (fr) * 1986-01-17 1987-07-29 Rexroth-Sigma Distributeur de fluide hydraulique sous pression
EP0232014A3 (en) * 1986-01-31 1989-11-08 Moog Inc. Energy-conserving servomechanisms
US5168705A (en) * 1990-03-05 1992-12-08 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system
US6116143A (en) * 1996-07-05 2000-09-12 Parker Hannifin Gmbh Controller for a fluid cylinder
US5992454A (en) * 1998-07-21 1999-11-30 Eaton Corporation Lower and float capability in four position control valve
EP2944828A4 (en) * 2013-08-19 2016-11-02 Jiangsu Hengli Hydraulic Co Ltd ENGINEERING HYDRAULIC CONTROL VALVE
EP3444484A1 (en) * 2017-08-03 2019-02-20 Kabushiki Kaisha Toyota Jidoshokki Hydraulic driving device of industrial vehicle
US10816018B2 (en) 2017-08-03 2020-10-27 Kabushiki Kaisha Toyota Jidoshokki Hydraulic driving device of industrial vehicle

Also Published As

Publication number Publication date
FR2181018B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-02-17
FR2181018A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-30
IT982728B (it) 1974-10-21
CA988392A (en) 1976-05-04
DE2318845A1 (de) 1973-10-31
JPS4920722A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-02-23
GB1420417A (en) 1976-01-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: PARKER INTANGIBLES INC., A CORP. OF DE, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PARKER-HANNIFIN CORPORATION;REEL/FRAME:005886/0169

Effective date: 19881221