US3367238A - Valve and method for operating mechanical tuyere puncher and the like - Google Patents

Valve and method for operating mechanical tuyere puncher and the like Download PDF

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Publication number
US3367238A
US3367238A US396667A US39666764A US3367238A US 3367238 A US3367238 A US 3367238A US 396667 A US396667 A US 396667A US 39666764 A US39666764 A US 39666764A US 3367238 A US3367238 A US 3367238A
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Prior art keywords
valve
motor
fluid
working fluid
spool
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US396667A
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English (en)
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Magee Albert Charles
Grassby James Neil
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Huntington Alloys Corp
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International Nickel Co Inc
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F01B17/02—Engines
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1225—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston with a plurality of pistons
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/43—Programme-control systems fluidic
    • G05B19/44—Programme-control systems fluidic pneumatic
    • 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
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series

Definitions

  • the spool valve is constructed so that in the actuated position Working fluid enters the valve to fire the associated motor whereupon the valve is reset and Working fluid is then conducted through the reset valve to the next actuated valve in the series to fire the associated motor.
  • the valve arrangement comprises means for transferring working fluid from one valve to the next valve in the series and a control system to automatically and substantially simultaneously actuate all of the valves in the series.
  • the present invention relates to apparatus and method for controlling the operation of fluid motors, and more particularly to a valve arrangement for automatically operating fluid motors used as tuyere punchers to remove obstructions in the tuyeres of metallurgical converters.
  • Metallurgical converting is a process of refining metals wherein air or oxygen-containing gases are blown into a molten bath.
  • Metallurgical converters have generally taken the form of a crucible furnace with passages known as tuyeres located below the level of the molten charge to admit the oxygen-containing gases under pressure.
  • the oxygen may react with materials in the immediate vicinity of the tuyeres forming accretions in and/or around the tuyeres thus hindering the flow of treating gases to the molten charge.
  • these accretions were removed or dislodged by manually pushing or punching a metallic bar through the tuyere in a reciprocating manner. Not only was the job of punching tuyeres expensive in terms of labor but the job also presented very disagreeable and hazardous working conditions.
  • the operation of the tuyere puncher in the abovementioned patent consists in admitting working fluid, usually compressed air, into a valve on the motor.
  • working fluid usually compressed air
  • the valve When the valve is cocked, the working air enters the rearward portion of the motor which drives the motor piston and punching rod forward to punch the tuyere.
  • the kinetic energy of the piston compresses the fluid medium, e.g., air, ahead of the piston to an extent which is sufficient to return the motor piston to its at-rest position.
  • the fluid medium e.g., air
  • the valve in its at-rest position opens an exhaust port and permits the spent working air to be exhausted from the rearward portion of the motor as the piston is being returned by the compressed air in the motor cylinder ahead of the motor piston.
  • the motor-valve arrangement may then be set or cocked so that the working piston can be fired again.
  • valve on the motor assumes an important role in controlling the operation of the working motor.
  • Attempts have been made to provide valves to control the mechanical punching of tuyeres when using fluid motors.
  • the prior art valves have presented numerous difficulties. For example, some valves have had a great number of moving parts which not only increases the initial cost but presents great problems in maintenance.
  • Other prior art valves utilized a sliding-valve feature which because of rnetal-to-metal con tact under the pressure of the working medium resulted in wear of the valve moving parts and attendant short life of the valves.
  • Another object of the invention is to provide a simplified spool valve with a minimum number of parts.
  • the invention also contemplates providing an arrangement of valves and fluid motors in series in which the working fluid pressure drop from one motor to another is held to a minimum.
  • the invention further contemplates providing a valve arrangement to permit automated operation of a series of fluid motors.
  • Still another object of the invention is to provide a method of operating a series of fluid motors in which partial firings or misfirings are avoided.
  • FIGURE 1 is a longitudinal cross-sectional view of a novel valve of this invention operably affixed to a fluid motor;
  • FIGURE 2 depicts a cross-sectional plan view of a valve of this invention
  • FIGURE 3 shows a front end view of a valve of this invention in combination with a fluid motor
  • FIGURE 4 illustrates in a diagrammatic drawing an arrangement for automating a series of valve-motor combinations.
  • the present invention contemplates a novel spool valve mechanism for controlling a fluidpowered reciprocating tuyere puncher motor and a method for controlling the operation of a bank of such tuyere puncher motors connected in series.
  • the valve comprises the combination of a valve chest with at least four fluid ports in the walls thereof and a spool-like member having a plurality of flanges in fixed longitudinal relation to each other disposed therein with said flanges being substantially engaging with the valve chest walls and in slidable contact therewith to form therewith a plurality of chambers movable longitudinally in forward and rearward directions, i.e., in the forward and at-rest positions of the spool-like member, within the valve chest.
  • the valve chest cross section is circular although it may take other geometric forms, e.g., elliptical, rectangular, triangular, etc., in response to particular requirements.
  • the ports provide entry and exit means for the working fluid, an exhaust means for the spent working fluid from the motor and communication means to the motor to permit working fluid to be introduced and subsequently exhausted therefrom.
  • the flanges form fluid-tight chambers so that the exhaust port is isolated, the working fluid inlet port and motor access port are in communication and the working fluid outlet port is isolated.
  • the flanges on the spool-like member form fluid-tight chambers so that the exhaust port and motor access port are in communication and the working fluid inlet port and working fluid outlet port are in communication.
  • Means are provided to move the spoollike member to the forward position.
  • Means are also provided for moving the spool-like member to the rearward position.
  • the working fluid inlet of the valve on the first motor is connected with a source of high pressure fluid and the working fluid outlet is connected with the working fluid inlet of the valve on the second motor. This arrangement is repeated for each succeeding motor.
  • the working fluid outlet of the valve on the last motor is connected to means that permit the exhausting from all the valves of the high pressure working fluid.
  • the operation of the motors is started by activating the means for moving the spool-like member forward in all of the valves.
  • High pressure working fluid e.g., air
  • the piston of the first motor is substantially near the end of its working stroke,
  • the means for moving the spool-like member of the first valve to the rearward position is actuated.
  • the rearward position of the spool-like member permits the high pressure working fluid to enter the second valve.
  • This process is repeated for each succeeding valve-motor arrangement.
  • the source of the high pressure working fluid is turned oif and the exhaust means connected to the valve on the last motor as actuated to exhaust all of the valve chests of residual high pressure working fluid.
  • the means controlling the exhaust are deactivated and the entire process can be repeated.
  • valve body 3 is provided with end plates 4 and 5 fastened to the valve body by bolts 6.
  • the valve body is lined with a tubular steel liner as indicated at 7.
  • the valve chest has a number of of ports as shown at 8, 9, and 11.
  • Spool-like member 12 is longitudinal-1y disposed in the valve chest. The spoollike member is movable to a rearward position, as shown by the solid lines in FIG. 1, and a forward position, as shown by the dotted lines.
  • the spool-like member as shown in this embodiment, has three flanges 13, 14 and 15, each of which has O-ring seals 16, 17 and 18 to form air-tight chambers with the valve chest Walls.
  • Flange 13 in this embodiment is dimensioned to block off or isolate the exhaust port 8 when the spool-like member is in the forward or cocked position and high pressure working air is admitted to the valve which avoids the necessity of an additional flange.
  • Valve chest 3 has ports 19 and 20 which are the means of this embodiment to provide forward and rearward motion of the spool-like member. The interrelationship of the ports 8, 9, 10, 11, 19 and 20 and the chambers formed by the flanges 13, 14 and 15 and the valve chest walls can best be seen by analyzing the operation of the valve.
  • This compressed air is directed to port 20 through motor passage 24 and moves the spool-like member to the rearward or at-rest position at which position exhaust port 8 is open to the atmosphere and spent working air behind motor piston 23 conducted through motor passage 22 is exhausted as motor piston 23 is returned to its at-rest position.
  • a bleeder port 32 is located in flange 15 of the spool-like member. This port provides communication from the chamber formed by flanges 14 and 15 of the spool-like member and the walls of the valve chest to the pneumatic motor cylinder 21 via port 20 and motor passage 24.
  • the high pressure working air is turned off and all the valves are exhausted since the series of valve chambers formed by flanges 14 and 15 and the valve walls are all in communication. After all the valves have been exhausted, the working cycle can then be repeated.
  • the motor-valve arrangement for the operation of a series of motors is diagrammatically illustrated in FIG. 4.
  • the pneumatic motors are represented generally at 1 and the valves at 2.
  • the working air inlet 10 of the first valve is operably connected to a control means 26 which controls the flow of high pressure working air from a source not shown.
  • the working air outlet 11 of the first valve is connected to the working air inlet 10 of the second valve. This pattern is repeated for each valve in the series.
  • the working air outlet 11 of the last motor in the series is operably connected to control means 27 which permits exhausting residual high pressure working air after all the motors have completed their working stroke.
  • Ports 19 of all the valves are connected to a header 30 which leads to a source of high pressure actuating or cocking air.
  • the header 30 has control means 28 and 29.
  • Control means 28 operate to open or close header 30 to the atmosphere.
  • Control means 29 open and close header 30 to a high pressure actuating air source not shown in the drawing.
  • Control means 26, 27, 28 and 29 may be solenoid switches which control valves not shown in the drawing.
  • the solenoid switches are energized and de-energized by a timer 31.
  • the timer 31 is energized by a remote signal which may be generated by a change in working conditions, e.g., a drop in the volume of air flowing to the converter as a result of buildup of accretions in the tuyeres, or the passage of a predetermined interval.
  • each bank has a series of motors equal to onehalf the number of tuyeres in the converter.
  • Each motor can be arranged on a tuyere as shown by Canadian Patent No. 557,354.
  • the source of high pressure working fluid is left open to the spool valves to maintain the spool-like members and the motor pistons in the atrest position when tilting the converter to charge or discharge.
  • timer 31 energizes control means 26 to close high pressure working air to valves 2,
  • control means 27 to exhaust residual high pressure working air from the valves 2,
  • control means 29 energizes control means 29 to open header 30 to high pressure actuating air to substantially simultaneously actuate all the valves
  • the timer is set to receive another remote signal to repeat the operation.
  • any compressible fluid may be used. Accordingly, the word fluid in the present application refers to any compressible fluid. Examples of other useful fluids are steam, inert gases and compressible hydrocarbons.
  • the present invention is particularly applicable to tuyere punching operations as outlined hereinbefore, where it is desirable to maintain large volume flows of air or oxygen-containing gases to a molten charge.
  • the frequency of the cycle of operations can be regulated so as to give a desired flow rate.
  • the cycle can be regulated by flow rate measurements, it has been found advantageous to operate on a predetermined time interval. This time interval will vary depending on the composition of the molten charge. For example, a time cycle of about thirty seconds to two minutes has been found satisfactory with the lower time cycles being advantageous when blowing a nickel-copper matte.
  • the present invention provides simplified valves for controlling the operation of a series of fluid motors.
  • a series of fluid motors equipped with the valves of this invention no sudden drop in working fluid pressure is experienced since the motors fire one at a time in rapid succession.
  • the invention provides a control system in which only one set of four controls is required to operate an entire bank of motors. This not only reduces initial cost but also reduces maintenance expenses.
  • the invention provides a method of operating a series of motors which is particularly useful in tuyere punching of metallurgical converters.
  • a valve arrangement comprising, in combination, a plurality of series-connected, cockable, re-settable spool-type valves individually mounted on and operatively connected to fire in sequence single stroke fluid motors, header means having fluid-admitting and fluidexhausting means connected to said valves to communicate cocking fluid thereto and to exhaust cocking fluid therefrom, means for providing working fluid to and exhausting working fluid from said valves, re-setting means connected to each of said valves and control means for admitting cocking fluid and working fluid to and exhausting cocking fluid and working fluid from said valves, with each of said valves being constructed such that, in the cocked position of the valve, Working fluid is admitted to the motor associated therewith to fire said motor whereafter the valve mounted on said motor is re-set and such that, in the re-set position, working fluid is communicated through the valve to the next successive valve in the series and the motor associated with the valve is exhausted of working fluid, whereby each of said valves is cocked substantially simultaneously, working fluid is admitted
  • control means are valves controlled by solenoid switches.
  • a process for sequentially operating a series valve arrangement with each valve individually mounted on a single stroke fluid motor comprising the steps of substantially simultaneously actuating all of the valves by admitting actuating fluid to the valves, thereafter exhausting the actuating fluid to the atmosphere, then admitting working fluid from a working fluid source to the first valve in the series to fire the first motor, then resetting said first valve, conducting working fluid from said first valve to the next valve in the series to fire the motor associated therewith, sequentially repeating the step of admitting working fluid to a valve in the series to fire the motor associated therewith and to re-set the valve for each valve in the series, and closing the working fluid source to the first valve in the series after the motor associated with the last valve has fired.
  • a valve in combination with a fluid motor to be operated in a series valve arrangement in which each valve is individually mounted on a single stroke fluid motor comprising means defining an elongated valve chest, said valve chest having a plurality of fluid passage means, actuating means and resetting means, said passage means defining an exhaust outlet, a motor port, a working fluid inlet and a working fluid outlet, a spool-like member disposed longitudinally in said valve chest, said spool-like member having a plurality of flanges and being movable to a forward position by said actuating means and to a rearward position by said re-setting means, and said plurality of flanges forming substantially fluid-tight chambers with the walls of said valve chest so that in said forward position the exhaust outlet is isolated, the motor port and working fluid inlet are in communication and the working fluid outlet is isolated and so that in said rearward position the exhaust outlet and motor port are in communication and the working fluid inlet and working fluid outlet are in communication.
  • a valve as claimed in claim 6 wherein the actuating means is a fluid port and fluid entering said port acts against the rearward flange of the spool-like member to move said member to the forward position.
  • valve chest has a steel liner.
  • a valve in combination with a fluid motor to be used in a valve series arrangement in which each valve is individually mounted on a single stroke fluid motor C0111- prising means defining an elongated valve chest, said valve chest having fluid passage means defining an actuating fluid inlet, an exhaust outlet, a motor port, a working fluid inlet, a working fluid outlet and a re-setting fluid inlet, a spool-like member mounted longitudinally in said valve chest, said spool-like member having a plurality of flanges and being movable to a forward position by action of actuating fluid and to a rearward position by action of re-setting fluid and said plurality of flanges forming substantially fluid-tight chambers with the walls of said valve chest so that in the forward position the exhaust outlet is isolated, the motor port and working fluid inlet are in communication and the working fluid outlet is isolated and so that in the rearward position the exhaust outlet and motor port are in communication and the working fluid inlet and working fluid outlet are in communication.
  • a valve in combination with a single stroke reciprocating motor comprising means defining an elongated valve chest, said valve chest having fluid passage means defining an actuating fluid inlet, an exhaust outlet, a motor port, a working fluid inlet, a working fluid outlet and a re-setting fluid inlet, a spool-like member longitudinally disposed within said valve chest and movable to forward and rearward positions, said spool-like member having a plurality of flanges which form a plurality of fluid-tight chambers with the walls of said valve chest, one of said flanges having a bleeder port which provides communication between the working fluid inlet and the re-setting fluid inlet when said spool-like member is in the rearward position, and said valve being operably connected to a single stroke fluid motor such that actuating fluid entering the actuating fluid inlet moves the spool-like member to the forward position thereby isolating the exhaust outlet, bringing the motor port and working fluid inlet into com- 'munic
  • a valve in combination with a single stroke reciprocating motor comprising means defining an elongated valve chest, said valve chest having fluid passage means defining an actuating fluid inlet, an exhaust outlet, a motor port, a working fluid inlet, a working fluid outlet and a re-setting fluid inlet and a spool-like member longitudinally disposed within said valve chest and movable to forward and rearward positions, said spool-like memberhaving a plurality of flanges which form a plurality of fluid-tight chambers with the walls of said valve chest, and said valve being operably conected to a single stroke fluid motor such that actuating fluid entering the actuating fluid inlet moves the spool-like member to the forward position thereby isolating the exhaust outlet, bringing the motor port and working fluid inlet into communication to start the motor piston on its working stroke and isolating the working fluid outlet and such that fluid compressed by the motor piston returns the motor piston and the spool-like member to the rearward position thereby bringing the exhaust outlet
  • a valve in combination with a single stroke reciprocating motor comprising means defining an elongated valve chest, said valve chest having fluid passage means defining an exhaust outlet, a motor port, a working fluid inlet, and a working fluid outlet, a spool-like member longitudinally disposed within said valve chest and movable to forward and rearward positions, said spool-like member having a plurality of flanges which form a plurality of fluid-type chambers with the walls of said valve chest, actuating means to move said spool-like member to said forward position, and re-setting means to move said spool-like member to said rearward position, said valve being operably connected to a single stroke fluid motor such that said actuating means move the spool-like member to said forward position to isolate the exhaust outlet, to bring the motor port and working fluid inlet into communication to start the motor piston on its working stroke and to isolate the working fluid outlet and such that said re'setting means return said spool-like member to said rearward position to bring the exhaust outlet and
  • a valve arrangement comprising, in combination, a plurality of series-connected valves individually mounted on and operably connected to fire in sequence single stroke fluid motors; each of said valves comprising means defining an elongated valve chest, said valve chest having a plurality of fluid passage means defining an actuating fluid inlet, an exhaust outlet, a motor port, a working fluid inlet, a working fluid outlet and a re-setting fluid inlet, a spool-like member mounted longitudinally in said valve chest, said spool-like member having a plurality of flanges and being movable to an actuated position by action of actuating fluid and to a re-set position by action of re-setting fluid, and said plurality of flanges forming substantialy fluid-tight chambers with the wall of said valve chest so that in the actuated position the exhaust outlet is isolated, the motor port and working fluid inlet are in communication, and the working fluid outlet is isolated, and so that in the re-set position the exhaust outlet and motor port are

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US396667A 1964-04-23 1964-09-15 Valve and method for operating mechanical tuyere puncher and the like Expired - Lifetime US3367238A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590686A (en) * 1968-05-25 1971-07-06 Rudolf Bock Valve assemblies for sequentially actuating fluid-operated parts

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU7774891A (en) * 1990-05-04 1991-11-27 Wolfgang Barth Process for running a pneumatic motor and device for implementing the process

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US1994974A (en) * 1930-06-21 1935-03-19 Oilgear Co Differential resistance valve
US2290479A (en) * 1939-06-02 1942-07-21 Mercier Jean Hydraulic control system
US2357986A (en) * 1942-06-03 1944-09-12 Samuel P Wichterman Valve mechanism
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US2475298A (en) * 1945-06-22 1949-07-05 Goodman Mfg Co Hydraulic control valve
US2486087A (en) * 1943-07-29 1949-10-25 Galion Iron Works & Mfg Co Hydraulic valve
US2619938A (en) * 1949-08-08 1952-12-02 Kennecott Copper Corp Fluid pressure actuated motor
US2818881A (en) * 1953-05-21 1958-01-07 Ohio Commw Eng Co Sequential punching apparatus
US2913879A (en) * 1956-01-18 1959-11-24 Gen Motors Corp Fluid pressure circuits
US3233525A (en) * 1964-03-12 1966-02-08 Parker Hannifin Corp Fluid power control system
US3237641A (en) * 1962-09-19 1966-03-01 Alsacienne Constr Meca Preselective command device

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Publication number Priority date Publication date Assignee Title
US941426A (en) * 1904-02-04 1909-11-30 Gen Electric Turbine-controller.
US1663513A (en) * 1922-03-02 1928-03-20 Riley Stoker Corp Ram drive for underfeed stokers
US1994974A (en) * 1930-06-21 1935-03-19 Oilgear Co Differential resistance valve
US2290479A (en) * 1939-06-02 1942-07-21 Mercier Jean Hydraulic control system
US2357986A (en) * 1942-06-03 1944-09-12 Samuel P Wichterman Valve mechanism
US2466041A (en) * 1943-03-30 1949-04-05 Sperry Corp Servo system and control thereof
US2486087A (en) * 1943-07-29 1949-10-25 Galion Iron Works & Mfg Co Hydraulic valve
US2475298A (en) * 1945-06-22 1949-07-05 Goodman Mfg Co Hydraulic control valve
US2619938A (en) * 1949-08-08 1952-12-02 Kennecott Copper Corp Fluid pressure actuated motor
US2818881A (en) * 1953-05-21 1958-01-07 Ohio Commw Eng Co Sequential punching apparatus
US2913879A (en) * 1956-01-18 1959-11-24 Gen Motors Corp Fluid pressure circuits
US3237641A (en) * 1962-09-19 1966-03-01 Alsacienne Constr Meca Preselective command device
US3233525A (en) * 1964-03-12 1966-02-08 Parker Hannifin Corp Fluid power control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590686A (en) * 1968-05-25 1971-07-06 Rudolf Bock Valve assemblies for sequentially actuating fluid-operated parts

Also Published As

Publication number Publication date
BE657026A (da) 1965-06-11
GB1064887A (en) 1967-04-12

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