US3595271A - Directional flow control valve with float and check valve structure - Google Patents

Directional flow control valve with float and check valve structure Download PDF

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Publication number
US3595271A
US3595271A US3595271DA US3595271A US 3595271 A US3595271 A US 3595271A US 3595271D A US3595271D A US 3595271DA US 3595271 A US3595271 A US 3595271A
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United States
Prior art keywords
spool
port
motor
housing
valve
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Expired - Lifetime
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English (en)
Inventor
Vaughn A Nelson
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Navistar Inc
Case LLC
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International Harverster Corp
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Assigned to J.I. CASE COMPANY A DE CORP reassignment J.I. CASE COMPANY A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL HARVESTER COMPANY A DE CORP
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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
    • 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
    • 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
    • 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
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • Artman ABSTRACT An improved directional flow control valve having a housing including an intake port, two motor ports adapted for connection to opposing sides of a hydraulic motor and-an exhaust port for return of fluid from the hydraulic ram to the reservoir, the motor ports having check valve means interposed therein which normally preclude the return of fluid from said hydraulic ram to said valve housing, with control means within said valve housing for actuating the check valve means to selectively interconnect the intake port with either of the motor ports or to interconnect said motor parts with each other and the exhaust port to obtain a float condition within the hydraulic ram.
  • This invention concerns a novel directional flow control valve primarily utilized for controlling a two-way acting hydraulic motor and incorporating therein check valve means within the porting of the flow control valve which will normally preclude the return of fluid from the hydraulic motor to the valve housing, and having control means for selectively actuating the check valve means to interconnect the intake port with either of the motor ports, or to interconnect the motor ports with each other and the exhaust port to obtain a float condition for the hydraulic motor.
  • the device may be advantageously utilized with any hydraulic motor including continuously rotating motors, rotary actuators or cylinders, it is particularly adaptable to use with double acting hydraulic rams used to control earth working implements.
  • a check valve means which normally precludes the leakage of fluid flow back from the hydraulic motor into the valve housing.
  • Such check valves will fix" the position of the implement with respect to the vehicle, and leak back of the fluid as well as lowering of the implement is precluded.
  • the ability to obtain a float condition is also a desirable feature of a control valve in which condition the implement is completely free to maintain itself in a given relationship with the ground, automatically changing its vertical elevation according to the contour of the ground surface.
  • the prior art fails to disclose a suitable structure to accomplish these inconsistent functions.
  • a directional flow control valve into which is incorporated provisions for both the check-type function and float-type functions of hydraulic ram system which may include either a single or double acting ram.
  • a pilot-operated poppet valve is incorporated into the motor ports of a valve housing, which may be actuated by a reciprocable spool so as to open alternatively to eliminate the check function in one of the motor ports, or to open the motor ports simultaneously so as to permit intercommunication between the two ends of a hydraulic ram.
  • a further object is to provide adirectibnal flow control valve of a type described which is extremely simple to manufacture, is inexpensive, and relatively simple to repair.
  • FIG. I is an elevational view taken in section through the longitudinal centerline of the valve.
  • FIG. 2 is a sectional view taken along the lines 22 of FIG. I.
  • the unique advantages of my invention are incorporated into a valve for the well known closed center-type hydraulic system.
  • the invention includes a valve housing 10 having an elongated bore 11 extending therethrough with a spool 60 reciprocable within said bore.
  • This elongated bore 11 has enlarged chambers therein denoted by the letters A, B, C, D, and E normally separated from one another by the normal diameter of the spool as clearly depicted.
  • Reduced diameters of the spool 61, 66, and 69 are utilized to interconnect certain of these chambers with one another so as to permit fluid flow therebetween upon reciprocation of the spool 60.
  • the valve housing is also provided with an intake port 13, and two motor ports 15 and 17 which have associated cartridge units 32, 31 and 33 respectively to control flow to the chambers B, A, and C.
  • these cartridge units are actuated by reciprocation of the spool 60, but with respect to the control action of the spool alone, it should be noted that fluid energy from pump 9 is directed to intake port 13, through channel 14 to chamber B. Depending upon the direction of reciprocation of the spool 60, this fluid may be selectively delivered to chamber A, channel 16, and out motor port 15, or to chamber C, channel 18, and out motor port 17.
  • fluid may flow from the intake port 13 through the channel 14, chamber B, chamber A, channel 16 to the motor port 15.
  • fluid may be returned from the opposite end of the hydraulic ram through motor port 17, channel 18, chamber C, chamber E, and out an exhaust port 21.
  • fluid from the hydraulic ram being exhausted via channel 16, chamber A, chamber D, and exhaust port 20.
  • this directional flow control is also dependent upon three cartridge-type pilot operated poppet valves 31, 32 and 33 which are suitably inserted into chambers 35, 36, and 37 by threaded means so as to intersect and further control the flow of fluid to and from the intake port 13 as well as each of the motor channels 16 and 18. Since each of these cartridge units 31, 32, and 33 are substantially identical in function and structure, reference may be had to FIG. 2 for a more complete description ofone of said units, in this case cartridge unit 32.
  • a cylindrical housing 38 having radial apertures 39 and an open lower end 51 is threadably engaged in chamber 36 which is incorporated into the valve housing 10.
  • the appropriate cartridge When inserted the appropriate cartridge normally precludes flow of fluid into chambers A, B, and C from the respective ports 15, I3, and 17 as hereinafter explained.
  • the lower end of the housing 38 is provided with a seat 40 for a poppet element 41.
  • a pilot-operated valve 45 having a stem 46 thereon and its lower end being conical so as to reciprocate within aperture 42 in the bottom of poppet 41 and seat itself against surface 43.
  • a spring 47 biases this pilot member 45 against the seat 43, a reaction surface being provided by closure 48 of the cartridge unit which itself is held in place by a snapring as indicated.
  • the unit 38 as well as the closure 48 is suitably provided with sealing elements where indicated.
  • a small aperture 44 allows the pressurized fluid to communicate with the interior of poppet 41 and may pass freely through the fluted sections 50 of the pilot member 45 to act against the rear surface area of the pilot member 45 and poppet member 41.
  • This pressurized fluid acting downwardly on the poppet together with the spring 47 normally maintains the poppets in a seated position.
  • fluid energy acting against either the intake port 13, or either of the motor ports 15 and 17 will normally be precluded from flowing into the valve by this poppet member 41 which acts as a check valve unless opened.
  • the pilot member 45 In order to permit fluid to flow from a hydraulic ram through either of the motor ports 15 or 17, or to permit flow from the pump 9 into the valve housing 10, the pilot member 45 must be reciprocated upwardly. Suitable plungers 80, 81, and 82 reciprocating respectively within cylindrical openings 83, 84, and 85 serve as actuating elements to open each of the poppet valves 31, 32, or 33 upon movement of the spool 60 which is provided with cam surfaces (later explained) for effecting such reciprocation.
  • plunger unit 81 engages the stem 46 of the pilot member 45, this pilot member will be moved upwardly and fluid from the intake port 13 will flow through the apertures 39, the aperture 44 of the poppet member 41, aperture 42 and into channel 14.
  • the reciprocation of the plungers 80, 81, and 82 is effected by reciprocating movement of the spool 60.
  • inclined cam surfaces 62, 63, 70, 71 and 72 which extend from the reduced diameters of the spool 61, 66, and 69 will engage the plungers to cam them upwardly upon appropriate shifting of the spool 60.
  • a holding surface 64, 65, 67, 68, or 73 will operate to hold the plungers in their upward position.
  • the cam surfaces 63, 70, 71, and 72 should be so positioned that upward movement of plunger 81 will simultaneously cause upward reciprocation of the plunger within the port to which fluid is to be admitted to bore 11 leaving the opposite poppet to be opened by fluid flow. For example, if fluid is to be directed out of port 15 and returned to the exhaust 21 via port 17, movement to the right of spool 60 should open the poppets of cartridges 32 and 33 with fluid pressure opening poppet of cartridge 31.
  • a centering mechanism 100 which will normally maintain the spool 60 in the neutral position in which all of the poppet valves are closed.
  • This centering mechanism comprises a housing 101 threadably and sealingly attached to the valve housing as clearly indicated, and a compression spring 102 is employed in the housing 101 to act against suitable washers 103 or 104 maintained in place by abutment 108 and bolt 105 as disclosed so as to increase the bias of the spring at any time the spool 60 is reciprocated in either direction.
  • the bolt 105 acting against washer 104 extends into the spool 60 to connect the spring bias forces to the spool.
  • a seal assembly 107 disposed about spool 60 precludes leakage from the centering mechanism.
  • a unique flow sensitive detent mechanism comprises a spring biased flow responsive device within preferably the intake porting consisting of intake 13 and channel 14.
  • a spring 91 is interposed between a disc washer 93, and a flow responsive cup-shaped element 90. Consequently, if the spool 60 is reciprocated either to the right or to the left, the plunger 81' will be caused to move upwardly and seat itselfeither in detent position 67 or 68.
  • cup-shaped member 90 will be in its downward position so as to enable the detent mechanism to overcome the biasing force of the centering mechanism 100, but as soon as flow ceases and the hydraulic ram has travelled to the end of its stroke, the cupshaped member 90 will return to its original position with the centering mechanism 100 returning the spool 60 to its neutral position. Since only a resilient bias is imposed on spool 60, its position remains subject to manual control which may override the flow imposed bias.
  • the hydraulic ram is free to extend or contract depending on external forces, and if for example the ram is utilized with an implement attached to a vehicle, the implement may freely alter its vertical position to ride freely across varying terrain surfaces. It should be immediately appreciated that the check and float functions and the inventive subject matter may easily be incorporated in a valve having only one motor part.
  • my instant invention discloses several unique structural and operating characteristics. It may easily be adopted to be incorporated into an open centered-type valve structure and the flow responsive means herein disclosed might appropriately he placed within any of the ports, including the exhaust ports as well as either of the motor ports. By comparing the strength of the opposing biasing members, the valve will always be maintained in its proper position according to desires of the operator. Most importantly, it should be appreciated that if high operating pressures are created by heavy loads, my particular invention will overcome the disadvantages of the prior art in that the detent mechanism will positively hold until the ram has reached the end of its stroke. The entire system being substantially insensitive to high pressures. Finally.
  • a directional flow control valve has been disclosed in which check valves may be used and yet a float condition may be obtained.
  • the interaction between cam surfaces accurately positioned on a spool and the check valves so as to prevent leak back from a motor and to selec tively control the exhaust of fluid from one side of the motor or to create a float condition provides a unique manufacturing solution to achieve desirable functional capabilities.
  • the subcomponents herein disclosed may be incorporated into either an open or closed center system, it should be well appreciated that the present embodiment is merely illustrative and not restrictive.
  • An improved directional flow control valve comprising:
  • a housing having an intake port and two motor ports adapted for connection to opposing ends of a hydraulic ram and an exhaust port for return of fluid from the hydraulic ram to a reservoir;
  • check valve means interposed in said motor ports and said intake port which normally preclude return of fluid from said hydraulic ram to said valve housing;
  • valve housing or control means within said valve housing and effective to actuate said check valve means for selectively interconnecting saidintake port with either of said motor ports and the other motor port with an exhaust, or interconnecting said motor ports to obtain a float condition for the hydraulic ram.
  • spool means comprises a spool reciprocable within said valve housing.
  • control means comprises check valve-actuating means interposed between said spool and said check valve means for actuation by said spool to achieve interconnection between the intake port and either of said motor ports or interconnection between said motor ports.
  • control means comprises cam surfaces on said spool
  • check valve actuating means comprises reciprocable plungers reciprocated by said cam means to open said valves.
  • a directional flow control valve having a housing, an intake port and two motor ports, an exhaust port and a spool within said housing for interconnecting said intake ort with one of said motor ports and the other motor port wit said exhaust port, the improvement comprising:
  • check valve means within said motor ports and exhaust port for normally precluding fluid flow from a hydraulic ram to said valve housing or from said intake port to said spool;
  • actuating means interposed between said check valve means and said spool for selectively opening said check valves upon reciprocation of said spool;
  • At least three cam means on said spool whereby flow may be directed from either of said ends of said hydraulic ram to said exhaust port or to interconnect said motor ports and exhaust port,
  • An improved directional flow control valve comprising:
  • poppet valve means disposed within said channels for normally precluding fluid flow from said intake and motor ports to said elongated bore
  • spool means reciprocable within said elongated bore
  • control means disposed between said poppet valve means and said spool for actuating said poppet valves upon reciprocation of said spool.
  • said control means comprises plunger elements interconnecting said spool and said poppet valves, and
  • cam means disposed upon said spool which are effective to reciprocate said plunger elements upon reciprocation ofsaid spool.
  • said camming surfaces are so disposed upon said spool so as to selectively actuate the poppet valve in said intake port and the poppet valve in one motor port or to actuate solely said poppet valves in said motor ports.
  • An improved directional control valve comprising:
  • each port being in communication with said elongated bore
  • spool means reciprocable within said elongated bore
  • control means disposed between said poppet valve means and said spool for selectively permitting fluid flow from said intake port to said motor port or from said motor port to said exhaust port.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Hydraulic Motors (AREA)
  • Threshing Machine Elements (AREA)
  • Cyclones (AREA)
  • Fluid-Pressure Circuits (AREA)
US3595271D 1969-06-30 1969-06-30 Directional flow control valve with float and check valve structure Expired - Lifetime US3595271A (en)

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US83752769A 1969-06-30 1969-06-30

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US3595271A true US3595271A (en) 1971-07-27

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US3595271D Expired - Lifetime US3595271A (en) 1969-06-30 1969-06-30 Directional flow control valve with float and check valve structure

Country Status (5)

Country Link
US (1) US3595271A (fr)
JP (1) JPS5140288B1 (fr)
DE (1) DE2032107B2 (fr)
FR (1) FR2053043B1 (fr)
GB (1) GB1286210A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942555A (en) * 1974-03-25 1976-03-09 Indak Manufacturing Corporation Electrical switch and fluid control device
US4574839A (en) * 1984-04-19 1986-03-11 J. I. Case Company Directional control valve with integral flow control valve
US6523453B2 (en) * 2000-03-03 2003-02-25 New Holland North America, Inc. Hydraulic control valve for agricultural implements
US6746326B2 (en) * 2002-04-29 2004-06-08 Dronningborg Industries A/S Hydraulic clutch
DE10325294A1 (de) * 2003-06-04 2004-12-23 Bosch Rexroth Ag Hydraulische Steueranordnung
US20110017321A1 (en) * 2009-07-27 2011-01-27 Reiner Kunz Directional control valve arrangement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849704A1 (de) * 1978-11-16 1980-05-29 Kloeckner Humboldt Deutz Ag Hydraulisches steuergeraet
JPS63304290A (ja) * 1987-06-05 1988-12-12 北原　一孝 薄型ディスプレイ装置
DE19909714B4 (de) * 1999-03-05 2008-05-21 Linde Material Handling Gmbh Steuerventileinrichtung für einen hydraulischen Verbraucher
DE19909712B4 (de) * 1999-03-05 2009-04-23 Linde Material Handling Gmbh Steuerventileinrichtung für einen hydraulischen Verbraucher

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572705A (en) * 1950-05-04 1951-10-23 Deere Mfg Co Fluid control valve with selective float position
US2960111A (en) * 1958-05-27 1960-11-15 Borg Warner Selector valve with pressure balanced load holding poppet valve
US3125120A (en) * 1964-03-17 hasbany
US3216448A (en) * 1963-02-25 1965-11-09 Parker Hannifin Corp Spool valve assembly
US3358711A (en) * 1965-07-20 1967-12-19 Trw Inc Valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125120A (en) * 1964-03-17 hasbany
US2572705A (en) * 1950-05-04 1951-10-23 Deere Mfg Co Fluid control valve with selective float position
US2960111A (en) * 1958-05-27 1960-11-15 Borg Warner Selector valve with pressure balanced load holding poppet valve
US3216448A (en) * 1963-02-25 1965-11-09 Parker Hannifin Corp Spool valve assembly
US3358711A (en) * 1965-07-20 1967-12-19 Trw Inc Valve

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942555A (en) * 1974-03-25 1976-03-09 Indak Manufacturing Corporation Electrical switch and fluid control device
US4574839A (en) * 1984-04-19 1986-03-11 J. I. Case Company Directional control valve with integral flow control valve
US6523453B2 (en) * 2000-03-03 2003-02-25 New Holland North America, Inc. Hydraulic control valve for agricultural implements
US6746326B2 (en) * 2002-04-29 2004-06-08 Dronningborg Industries A/S Hydraulic clutch
DE10325294A1 (de) * 2003-06-04 2004-12-23 Bosch Rexroth Ag Hydraulische Steueranordnung
US20060150807A1 (en) * 2003-06-04 2006-07-13 Bosch Rexroth Ag Hydraulic control arrangement
US7213501B2 (en) 2003-06-04 2007-05-08 Bosch Rexroth Ag Hydraulic control arrangement
US20110017321A1 (en) * 2009-07-27 2011-01-27 Reiner Kunz Directional control valve arrangement
US8479768B2 (en) * 2009-07-27 2013-07-09 Robert Bosch Gmbh Directional control valve arrangement
EP2280179A3 (fr) * 2009-07-27 2013-11-13 Robert Bosch GmbH Agencement de distributeur

Also Published As

Publication number Publication date
FR2053043B1 (fr) 1973-04-06
FR2053043A1 (fr) 1971-04-16
DE2032107A1 (de) 1971-02-18
DE2032107C3 (fr) 1973-10-11
GB1286210A (en) 1972-08-23
JPS5140288B1 (fr) 1976-11-02
DE2032107B2 (de) 1973-03-22

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AS Assignment

Owner name: J.I. CASE COMPANY A DE CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY A DE CORP;REEL/FRAME:004379/0536

Effective date: 19850131