US3817154A - Apparatus for supplying fluid to a reversible drive organ - Google Patents

Apparatus for supplying fluid to a reversible drive organ Download PDF

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Publication number
US3817154A
US3817154A US00363168A US36316873A US3817154A US 3817154 A US3817154 A US 3817154A US 00363168 A US00363168 A US 00363168A US 36316873 A US36316873 A US 36316873A US 3817154 A US3817154 A US 3817154A
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Prior art keywords
conduit
valve
fluid
organ
opening
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Expired - Lifetime
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US00363168A
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English (en)
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L Martin
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Poclain SA
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Poclain SA
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • 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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member

Definitions

  • apparatus of this type have the disadvantage of being of unstable operation. Moreover, the very operating characteristics are often mediocre, the opening time of the flow-limiter being badly controlled and the closure time being too long.
  • the object of the invention is therefore an apparatus for supplying fluid to a reversible drive organ, which is connected to a load which provides its forced drive during the operating phase in question and which has first and second chambers, this supply apparatus consisting of:
  • a pump connected to the said reservoir by a suction conduit
  • a non-return valve which is arranged in the second conduit and which only allows passage of the fluid towards the second chamber
  • a third conduit which is connected to the said second conduit on either side of the non-return valve and in which is arranged an adjustable flow limiter,
  • a fourth conduit which is connected on the one hand to the first conduit and on the other to the flow adjustment organ of the said flowlimiter.
  • the adjustable flow limiteritself consists of:
  • an adjusted discharge valve which acts to maintain the pressure of the fluid which can be contained in the portion of the third conduit which is connected to the said discharge valve and is arranged directly downstream of this valve relative to the reservoir, substantially equal to a given value
  • valve with adjustable opening which is arranged between the drive organ and the discharge valve, which is distinct from this discharge valve, and the function of which is to regulate the value of the pressure of the fluid which can be delivered out of the second chamber during the abovementioned operating phase.
  • This valve with adjustable opening includes an organ for adjusting its opening, which is in equilibrium under the antagonistic influences, firstly, of the pressure of the fluid contained in the fourth conduit and, secondly, of the fluid pressure which is substantially equal to the given value.
  • the valve with adjustable opening is also advantageously provided with a shock-absorber for its opening motion.
  • the said shock-absorber consists of a piston, which is linked to the organ for adjusting the opening of the said valve with adjustable opening, being mounted slidably in the body of the said valve, and which, with the said body, defines on the one hand a first volume, which is freely in communication with the portion of the third conduit connected to the discharge valve and, on the other hand, a second volume.
  • a nonretum valve allows passage of the fluid from the first volume towards the second volume, while a calibrated channel, forming a restriction, connects the two said volumes.
  • a retaining organ tends "to keep the said piston and the said adjustment organ linked together.
  • the organ for adjusting the opening of the valve with adjustable opening consists of a slide mounted slidably in the body of the said valve.
  • This slide has a shoulder, the lateral adjacent wall of which can overlap the edge of a throat formed in the said valve body, one of the elements the lateral wall of the shoulder or the throatbeing provided with grooves having progressively vairable sections.
  • an elastic return organ is often inserted between the organ for adjusting the opening of the valve with adjustable opening and the said valve body and has an effect antagonistic to that of the pressure of the fluid contained in the fourth conduit.
  • FIG. 1 is a diagram of a supply apparatus forming an application for a flow-limiter in accordance with the invention
  • FIG. 2 is a sectional view of the adjustable flowlimiter with which the supply apparatus shown in FIG. 1 is fitted;
  • FIG. 3 is a section of a modification of a detail of the flow-limiter shown in FIG. 2.
  • FIG. 1 the presence will be noted of a reversible drive organ which, in this particular case, consists of a double-acting, hydraulic ram l.
  • the piston 2 of this ram defines with body 3 a first chamber 4 and a second chamber 5.
  • the rod 6 of the piston is arranged substantially vertically, while a mass 7 is linked to it by means of a clevis 8 and pin 9, and constitutes a load which tends to return rod 6 into body 3.
  • the first chamber 4 is arranged above the second chamber 5.
  • a pump 10 and a fluid reservoir 11 are connected by the suction conduit 12 of the pump.
  • a three-position distributor 13 is connected, by a first conduit 14, to the delivery side of pump 10 and, by a second conduit 15, to reservoir 11..
  • a third conduit 16 connects the distributor to the first chamber 4, while a fourth conduit 17 connects this distributor to the second chamber 5.
  • a non-retum valve 18 is arranged in the fourth conduit 17, so as to allow passage of the fluid from the distributor 13 towards the: second chamber 5.
  • an adjustable flow-limiter 19 which is more particularly described with reference to FIG. 2, is arranged in a fifth conduit 20, which is connected to the fourth conduit 17 on either side of nonretum valve 18.
  • a sixth conduit 21, which is connected to the third conduit 16, is also connected to the organ for adjusting the opening of flow-limiter 19, as will be observed below with reference to FIG. 2.
  • hydraulic driven part supply circuit does not limit the application of the invention to this single embodiment.
  • a particular alternative would be application to the case in which the pump has regulation of its flow, and this would then be a closed-circuit supply, which is conventional in hydraulics and does not require a reversing distributor.
  • the flow-limiter 19 shown in FIG. 2 comprises the two following, distinct elements:
  • valve with adjustable opening consisting of a slide 28, which is slidably mounted in body 25, and which has a shoulder 29, which is provided with grooves 30 of variable sections and the lateral wall 34 ofwhich overlaps the edge 31 of a throat 32 formed in body 25.
  • a weakly adjusted spring 33 tends to return slide 28 in the direction of closure of conduit 20 by lateral wall 34, and does so by acting on an end surface 29a of slide 28.
  • slide 28 has a second end surface 29b and an intermediate surface 29c, which is directed in the opposite direction to surface 29b.
  • conduit 20 is in fact divided into three sections, which are connected, one to second chamber 5 of ram 1 and to an intake conduit 35 of body 25, and another to distributor l3 and to an output conduit 36 of body 25 and, finally, an intermediate section, also known as the internal conduit, which connects throat 32 to dischargevalve 22.
  • the pressure of the fluid contained in the said intermediate section of conduit 20 acts on surface 290, in the same direction as spring 33, and has an influence antagonistic to that of the pressure of the fluid contained in conduit 21, which acts on end surface 29b of slide 28.
  • FIG. 3 shows an advantageous modification of flowlimit'er 19, in which a complementary piston 37 is slidably mounted in body 25 at throat 32.
  • a spring 38 is connected between piston 37 and body 25, and tends to keep surface 39 of the said piston 37 in contact with end surface 29a of slide 28.
  • a first channel 40 is formed in piston 37, through which it passes. It connects a first volume 41, which is defined by throat 32 and opens into the portion of conduit 20 connected to the discharge-valve, to a second volume 42, which is closed and is in fact, in this particular case, closed by a plug 43.
  • a nonreturn valve 37a consisting of a ball-bearing, its plunger and a return spring only allows passage of fluid in channel 40 from the first volume 41 towards the second volume 42.
  • the ball bearing and its plunger are guided by vanes 44 rigidly connected to piston 37.
  • another, calibrated channel 45 connects the two volumes 4] and 42, in this particular case via a portion of first channel 40, and forms a restriction for the pas sage of the fluid.
  • Distributor 13 is firstly arranged in its second position.
  • the fluid drawn by pump 10 from reservoir 11 through suction conduit 12 is delivered into first and fourth conduits 14 and 17.
  • This fluid passes through non-return valve 18 and enters chamber 5 of ram 1.
  • the effect of the pressure of the fluid in chamber 5 on piston 2 is to push this piston and, therefore, to lift load 7, which is linked to piston rod 6.
  • the fluid contained in chamber 4 is delivered into reservoir 11, through third conduit 16, distributor 13 and second conduit 15.
  • distributor 13 When load 7 has been lifted, distributor 13 is arranged in its third position. This results in the closure of third and fourth conduits 16 and 17, and thus in shutting the fluid contained in chambers 4 and 5 in closed volumes. Load 7 is, therefore, immobilised, while pump 10 returns to reservoir 11 through first conduit 14, distributor 13 and second conduit 15.
  • a given passage is therefore formed between the two portions of conduit 20 which can be isolated by shoulder 29.
  • the size of this passage is directly governed by the pressure in sixth conduit 21. Now this pressure is either low, when load 7, driving piston 2, tends to form a vacuum in chamber 4 and consequently in third conduit 16 and sixth conduit 21, or high, when, on the other hand, load 7 does not drive piston 2 more rapidly than compensation is effected for the volume increase in chamber 4 by addition of fluid delivered by pump 10.
  • Flow-limiter 19 acts in two distinct phases: a phase in which the pressure of the fluid contained in chamber 5 is reduced, by possible throttling of the fluid between edge 31 and the lateral wall 34 and grooves 30 of shoulder 29, during which phase there is a consumption of power due to throttling, which is equal to the product of the flow-rate and the pressure differential between the fluid contained in chamber 20 on either side of shoulder 29;
  • first volume 41 While slide 28 moves in the direction opposite to the initial displacement direction, piston 37 moves under the influence of spring 38 in the same direction as the slide.
  • the pressure of the fluid contained in first volume 41 has the effect of pushing back the ball-bearing and the plunger of non-return valve 37a and thus allow ing free transfer of the fluid from the first volume 41 into the second volume 42, via channel 40.
  • the present invention is also applicable to the case of closed-circuit" supply by means of a reversible pump with flow-rate regulation.
  • a pump is connected to the supply circuit by two main conduits which, depending on the position of the flow-regulating organ, constitute either one suction conduit and the other the delivery conduit, or, conversely, one the delivery conduit and the other the suction conduit.
  • the portion of the circuit connected to the suction conduit by analogy with the case of the open circuit, then constitutes the fluid reservoir.
  • the organ for regulating the flow-rate of the pump selects the delivery direction of the said pump and, in that respect, can be considered as equivalent to the distributor 13 of the open-circuit.
  • a pump connected to the said reservoir by a suction conduit
  • a non-return valve which is arranged in the second conduit and only allows passage of the fluid towards the latter chamber
  • a fourth conduit which is connected, on the one hand, to the first conduit and, on the other hand, to the flow-regulating organ of the said flowlirniter, characterised in that the adjustable flowlimiter itself consists of:
  • an adjusted discharge-valve which acts to maintain the pressure of the fluid which can be contained in the portion of the third conduit which is connected to the said discharge-valve and is arranged directly downstream of this valve relative to the reservoir, substantially equal to a given value
  • valve with adjustable opening which is arranged between the drive organ and the dischargevalve and is distinct from this discharge-valve, and the function of which is to regulate the value of the pressure of the fluid which can be delivered out of the second chamber during the above-mentioned operating phase, while this valve with adjustable opening has an organ for adjusting its opening, which is in equilibrium under the antagonistic influences, on the one hand, of the pressure of the fluid contained in the fourth conduit and, on the other hand, of the fluid pressure which is substantially equal to the given value.
  • valve with adjustable opening is provided with a shock-absorber for its opening motion
  • the said shock-absorber consists of a piston, which is linked to the organ for adjusting the opening of the said valve with adjustable opening, being mounted slidably in the body of the said valve, and which defines with the said body, on the one hand, a first volume, which is freely in communication with the portion of the third conduit connected to the discharge-valve, and, on the other hand, a second volume, in that the non-retum valve allows passage of the fluid from the first volume towards the second volume, while a calibrated channel, forming a restriction, connects the said two volumes, and in that a retaining organ tends to keep the said piston and the said adjustment organ linked together.
  • the organ for adjusting the opening of the valve with adjustable opening consists of a slide mounted slidably in the body of the said valve, in that the said slide has a shoulder, the adjacent lateral wall of which can overlap the edge of a throat formed in the said valve-body, and in that one of the elements, lateral wall of the shoulder or edge of the throat, is provided with grooves of progressively variable sections.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Safety Valves (AREA)
  • Reciprocating Pumps (AREA)
US00363168A 1972-05-31 1973-05-22 Apparatus for supplying fluid to a reversible drive organ Expired - Lifetime US3817154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219573A FR2187086A5 (ja) 1972-05-31 1972-05-31

Publications (1)

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US3817154A true US3817154A (en) 1974-06-18

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US00363168A Expired - Lifetime US3817154A (en) 1972-05-31 1973-05-22 Apparatus for supplying fluid to a reversible drive organ

Country Status (10)

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US (1) US3817154A (ja)
JP (1) JPS4949084A (ja)
AR (1) AR198313A1 (ja)
BE (1) BE799230A (ja)
BR (1) BR7303953D0 (ja)
DE (1) DE2327712A1 (ja)
ES (1) ES414629A1 (ja)
FR (1) FR2187086A5 (ja)
GB (1) GB1380226A (ja)
IT (1) IT985983B (ja)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114516A (en) * 1976-10-15 1978-09-19 Caterpillar Tractor Co. Anti-cavitation and pressure modulating relief valve for controlling hydraulic cylinders
DE2829064A1 (de) 1978-07-01 1980-01-03 Zahnradfabrik Friedrichshafen Hilfskraftlenkung fuer kraftfahrzeuge
US4223693A (en) * 1978-07-27 1980-09-23 Modular Controls Corporation Counterbalance valve
US4259986A (en) * 1977-08-06 1981-04-07 Robert Bosch Gmbh Control apparatus for a hydraulic power consumer
US4261249A (en) * 1978-09-08 1981-04-14 Joy Manufacturing Company Hammer
US4266464A (en) * 1977-06-22 1981-05-12 Danfoss A/S Hydraulic control apparatus for servo-motor particularly for vehicle steering
US4300584A (en) * 1978-02-10 1981-11-17 Modular Controls Corporation Hydraulic sequence valve
US4341148A (en) * 1980-09-30 1982-07-27 Modular Controls Corporation Hydraulic sequencing valve
DE2857451C3 (ja) * 1978-07-01 1987-01-22 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen, De
US4838532A (en) * 1987-08-10 1989-06-13 Aladdin Engineering & Mfg., Inc. Fluid operated clamping device including fluid pressure locking means
US5081904A (en) * 1989-08-30 1992-01-21 Aladdin Engineering & Mfg., Inc. Locking valve and flow control valve assembly
US5676169A (en) * 1996-01-24 1997-10-14 Power Team Division Of Spx Corporation Counterbalance valve
US5960814A (en) * 1997-09-12 1999-10-05 Ngt, Llc. Counter balanced locking valve
US6131610A (en) * 1996-11-22 2000-10-17 Smc Kabushiki Kaisha Speed controller with pilot check valve
US6477937B1 (en) 1999-12-13 2002-11-12 Aladdin Engineering & Manufacturing Valve arrangement including release valve
US6520342B1 (en) 2000-02-16 2003-02-18 Aladdin Engineering & Manufacturing, Inc. Product handling apparatus
US20100059125A1 (en) * 2008-08-28 2010-03-11 Kot Norbert J Balanced pilot operated check valve
US20100090143A1 (en) * 2008-08-28 2010-04-15 Kot Norbert J Dual locking valve
US9611871B2 (en) 2013-09-13 2017-04-04 Norbert J. Kot Pneumatic valve assembly and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0441739A1 (de) * 1990-02-08 1991-08-14 Alusuisse-Lonza Services Ag Verfahren zur Aufbereitung von aus mit einer Oberflächenbeschichtung versehenen Metallteilen bestehenden Abfällen durch Zerkleinerung
DE19510586A1 (de) * 1995-03-23 1996-09-26 Rexroth Mannesmann Gmbh Rohrbruchsicherungsventil
FR2734607A1 (fr) * 1995-05-24 1996-11-29 Eha Engineerie Hydromecanique Dispositif hydraulique differentiel pour alimentation et verrouillage de verins de commande a double effet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972462A (en) * 1932-06-29 1934-09-04 Nat Automatic Tool Co Hydraulic circuit back pressure control
US2328980A (en) * 1942-05-16 1943-09-07 Vickers Inc Power transmission
US2470778A (en) * 1946-06-25 1949-05-24 Matthew B Butler Hydraulic system for selfloading trucks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972462A (en) * 1932-06-29 1934-09-04 Nat Automatic Tool Co Hydraulic circuit back pressure control
US2328980A (en) * 1942-05-16 1943-09-07 Vickers Inc Power transmission
US2470778A (en) * 1946-06-25 1949-05-24 Matthew B Butler Hydraulic system for selfloading trucks

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114516A (en) * 1976-10-15 1978-09-19 Caterpillar Tractor Co. Anti-cavitation and pressure modulating relief valve for controlling hydraulic cylinders
US4266464A (en) * 1977-06-22 1981-05-12 Danfoss A/S Hydraulic control apparatus for servo-motor particularly for vehicle steering
US4259986A (en) * 1977-08-06 1981-04-07 Robert Bosch Gmbh Control apparatus for a hydraulic power consumer
US4300584A (en) * 1978-02-10 1981-11-17 Modular Controls Corporation Hydraulic sequence valve
DE2857451C3 (ja) * 1978-07-01 1987-01-22 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen, De
DE2829064A1 (de) 1978-07-01 1980-01-03 Zahnradfabrik Friedrichshafen Hilfskraftlenkung fuer kraftfahrzeuge
US4223693A (en) * 1978-07-27 1980-09-23 Modular Controls Corporation Counterbalance valve
US4261249A (en) * 1978-09-08 1981-04-14 Joy Manufacturing Company Hammer
US4341148A (en) * 1980-09-30 1982-07-27 Modular Controls Corporation Hydraulic sequencing valve
US4838532A (en) * 1987-08-10 1989-06-13 Aladdin Engineering & Mfg., Inc. Fluid operated clamping device including fluid pressure locking means
US5081904A (en) * 1989-08-30 1992-01-21 Aladdin Engineering & Mfg., Inc. Locking valve and flow control valve assembly
US5676169A (en) * 1996-01-24 1997-10-14 Power Team Division Of Spx Corporation Counterbalance valve
US6296015B1 (en) 1996-11-22 2001-10-02 Smc Kabushiki Kaisha Speed controller with pilot check valve
US6131610A (en) * 1996-11-22 2000-10-17 Smc Kabushiki Kaisha Speed controller with pilot check valve
US6293180B1 (en) 1996-11-22 2001-09-25 Smc Kabushiki Kaisha Speed controller with pilot check valve
US5960814A (en) * 1997-09-12 1999-10-05 Ngt, Llc. Counter balanced locking valve
US6477937B1 (en) 1999-12-13 2002-11-12 Aladdin Engineering & Manufacturing Valve arrangement including release valve
US20030111117A1 (en) * 1999-12-13 2003-06-19 Horn Edward R. Valve arrangement including release valve
US6997210B2 (en) 1999-12-13 2006-02-14 Aladdin Engineering & Manufacturing, Inc. Valve arrangement including release valve
US6520342B1 (en) 2000-02-16 2003-02-18 Aladdin Engineering & Manufacturing, Inc. Product handling apparatus
US20100059125A1 (en) * 2008-08-28 2010-03-11 Kot Norbert J Balanced pilot operated check valve
US20100090143A1 (en) * 2008-08-28 2010-04-15 Kot Norbert J Dual locking valve
US8262058B2 (en) 2008-08-28 2012-09-11 Kot Norbert J Balanced pilot operated check valve
US9611871B2 (en) 2013-09-13 2017-04-04 Norbert J. Kot Pneumatic valve assembly and method

Also Published As

Publication number Publication date
BR7303953D0 (pt) 1974-06-27
ES414629A1 (es) 1976-01-16
GB1380226A (en) 1975-01-08
FR2187086A5 (ja) 1974-01-11
BE799230A (fr) 1973-08-31
DE2327712A1 (de) 1973-12-20
JPS4949084A (ja) 1974-05-13
AR198313A1 (es) 1974-06-14
IT985983B (it) 1974-12-30

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