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US3285183A - Control assembly for oil well pump - Google Patents

Control assembly for oil well pump Download PDF

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US3285183A
US3285183A US41503864A US3285183A US 3285183 A US3285183 A US 3285183A US 41503864 A US41503864 A US 41503864A US 3285183 A US3285183 A US 3285183A
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Prior art keywords
fluid
pump
valve
casing
level
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Oscar O Hembree
Clyde E Yost
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HAGANHEM CO Inc
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HAGANHEM CO Inc
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems

Description

Nov. 15, 1966 o. o. HEMBREE ETAL 3,285,183

CONTROL ASSEMBLY FOR OIL WELL PUMP Filed Dec. 1, 1964 2 Sheets-Sheet 1 Oscar 0. Hembree i 3 Clyde E. Yosf INVENTORS I A a i i 511/6 1;) @5100 5E7 a Altarnqys 1966 o. o. HEMBREE ETAL 3, 83

CONTROL/ ASSEMBLY FOR OIL WELL PUMP Filed Dec. 1, 1964 2 Sheets-Sheet 2 United States Patent 3,285,183 CONTROL ASSEMBLY FOR OIL WELL PUMP Oscar O. Hembree, Owensboro, Ky., and Clyde E. Yost, Evansville, Ind., assignors to Haganhem Company, Inc., a corporation of Kentucky Filed Dec. 1, 1964, Ser. No. 415,038 9 Claims. (Cl. 103-25) The present invention relates to a device for automatically controlling the pumping of fluid such as oil from anoil well by means of utilizing the force and flow characteristics of the fluid being pumped to activate or deactivate the pump motor when the fluid level has reached a desired high and low level respectively for automatically actuating the pump motor for pumping the fluid when the fluid level reaches a predetermined high point and automatically stopping the pump motor when the fluid level reaches a predetermined low point.

Various installations facilitate the application and adaptation of the present invention. For example, in storage tanks for fluids, in transfer operations where amounts of fluid are to be moved, in blind pumping of fluid from one tank to another tank at remote distances, exhausting of fluids from remote pits or holes deep in the ground and many others. In this particular application, the invention is disclosed for use in an oil well with it being pointed out that the invention is not limited to such use but encompasses many uses such as those mentioned above as exemplary.

In the particular use of the invention as disclosed, it is normal practice when an oil well has been completed to install pumping equipment with the pump being operated by an electric motor or a gasoline engine. The present invention may be incorporated into the pumping system to control both types of motors with the gasoline motor either being started by an automatically controlled starting mechanism or manually started after it has been automatically stopped. I

Also, in normal oil well pumping systems, control of the pumping mechanism requires the services of a person called a pumper who is engaged solely to observe the pumping of the well. His duties requires that he watch the flow of the fluid being pumped from the well and when the pump pumps-off (the term indicating the fluid has been exhausted from the hole) he shuts off the pump to allow the fluid to recover in the hole. The pumpers job is complicated by the fact that Well locations are usually widely dispersed and sometimes are inaccessible. Also, bad weather conditions and the total number of Wells to be watched further complicates the job of the pamper. Also, all formations do not surrender the fluid at the same rate and the human element injects a degree of uncertainty in controlling the pumping apparatuses. In some instances, an electric timing clock has been used to time the pumping cycle and this type of operation continues to operate the pump for a given length of time even though the fluid has been exhausted from the hole. When the pump mechanism continues to operate when the fluid has been exhausted from the hole, damage is done to the downhole equipment in the form of undue wear on the cups and working barrel surface of the pump. This operation also causes a condition referred to as cut oil and this damage is costly inasmuch as it requires pulling of the equipment to repair the damage and also results in inefficient pumping inasmuch as the down time required to repair the pump is lost.

The problems described above are eliminated by the present invention inasmuch as it eliminates the need for the time clock and also reduces considerably the need for a pumper. In using the present invention, when the fluid in the hole reaches a predetermined high level, the pump automatically starts to pump the fluid. When the fluid in the hole is pumped out and the lowest level as predetermined is reached, the pump automatically stops. The lowest desired level of the fluid can be accurately controlled so that the formation will not be exposed which is desirable inasmuch as this will prevent the formation from drying out or otherwise being coated by contact with normal bottom hole atmosphere thus maintaining the free surrender of the fluid from the formation.

Thus, basically, the present invention serves to activate the pump when it is needed and subsequently deactivate the pump when it is not needed. It is always ready to control the pump and thus eliminates the need for a pumper to do this work and releases him for other duties.

The present invention incorporates two methods of accomplishing this purpose one of which may be considered a float and flow method and the other a pressure and flow method with both methods involving apparatuses which are relatively simple in construction, dependable in operation, eflicient, long lasting and relatively inexpensive to manufacture.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a side view illustrating the float and flow method of the present invention installed on an oil well flow pipe;

FIGURE 2 is a longitudinal, vertical sectional view, on an enlarged scale, taken substantially upon a plane passing along section line 2-2 of FIGURE 1;

FIGURE 3 is a partial sectional view similar to FIG- URE 2 but illustrating the structure in pump actuating condition;

FIGURE 4 is a transverse, sectional view taken substantially upon a plane passing along section line 44 of FIGURE 2 illustrating further structural details of the form of the invention;

FIGURE 5 is a bottom plan view taken generally upon reference line 55 of FIGURE 2 illustrating further structural details of this form of the invention;

FIGURE 6 is a transverse, sectional view taken substantially upon a plane passing along section line 6-6 of FIGURE 2; and

FIGURE 7 is a sectional view illustrating the pressure and flow apparatus.

The present invention, as illustrated in FIGURE 1, is designated by the numeral 10 and it attached to the working barrel or bottom hole pump 12 having a perforated nipple 14 attached to the lower end thereof. The lowest desired fluid level is designated by numeral 16 and the highest desired fluid level is designated by numeral 18. The control device 10 is secured to the working barrel or tubing 12 by a plurality of suitable straps 20 and includes a top inlet fitting 22 and a bottom inlet or outlet fitting 24 which is carried by the lower end of a tubular casing 26. The upper end of the tubular casing is connected to the top inlet fitting 22 by an elongated flexible tube 28 which may be of any desired length depending upon the installation requirements. For example, the plastic tube or pipe may be from'five' feet 'to fifteen feet in length with it being understood that any suitable length may be employed with the plastic tube 28 not only forming a passage for fluid entering the top inlet fitting 22 so that it can proceed into the casing 26 but 3 also provides a passage for a multiple conductor conduit 30.

As illustrated in FIGURE 2, the tubular casing 26 has a screw-threaded fitting 32 at the upper end thereof in sealed relation thereto with the fitting 32 having a bore 34 therethrough communicating with the interior of the plastic tube 28, the tube being secured to the fitting 32 in any suitable manner. The lower end of the casing 26 has the lower inlet fitting '24 screw-threaded thereto with the lower inlet fitting 24 being in the form of a screwthreaded plug 36 having a conical lower end 38 which has four radial slots or grooves 40 formed therein which communicate with a central longitudinal bore 42 which communicates with the interior of the casing 26.

Disposed in the casing 26 is a valve seat member 44 having a longitudinal passageway 46 therethrough provided with a valve seat 48 at the lower end thereof and a valve seat 50 at the upper end thereof. A solenoid controlled valve member 52 engages the lower valve seat 48 and is retained against the valve seat by a compression spring 54 engaging the bottom end of an elongated shank 56 on the valve member 52. An electromagnetic coil 58 encircles a sleeve 60 forming a guide for the valve member so that when the coil 58 is energized, the valve 52 will be retracted downwardly into the interior of the coil inasmuch as the valve member 52 including the stem or shank 56 serves as the movable armature of the electromagnet. Connected electrically to the coil 58 is a conductor 62 which extends through the valve member 44 and into the interior of a sealed housing 64 having a pair of contact elements 66 and 68 therein in the form of spring wires which are normally spaced apart as illustrated in FIGURE 2. The contact element 68 is connected to a conductor 70 forming a continuation of the conduit 30 for completing a circuit to the solenoid and completing a circuit to a pump motor in a conventional manner when the switch contacts 66 and 68 are in contact and breaking the circuit to the motor for stopping the pump motor and stopping the pump and also deenergizing the solenoid for permitting the valve 52 to close.

Disposed interiorly and concentrically of the casing 26 is a tubular member 72 in the form of a guide for an elongated hollow float member 74 which moves longitudinally in theguides or tubular member 72. The upper end of the tubular member 72 is provided with inwardly struck lugs 76, one of which forms a passageway for the conductor 70 and all of which form a limit stop for the movement of the float 74. The tubular member 72 is provided with a plurality of longitudinally extending slots 78 for enabling fluid to flow into the space between the tubular members 72 and the casing 26 so that fluid may substantially completely enclose the float so that the fluid which is liquid or the like will cause the float 74 to move longitudinally in the tubular guide member 72.

At the lower end of the float 74, there is provided a permanent magnet 80 in the form of a valve member which rests against the valve seat 50 and which is movable off the valve seat when the float 74 floats upwardly to its uppermost position as illustrated in FIGURE 3.

As illustrated in FIGURES 2 and 3, the switch contacts 66 .and 68 are orientated so that the permanent magnet 80 Will be closedly adjacent thereto when the float 74 reaches its upper limit of movement as illustrated in FIGURE 3. The permanent magnet 80 will close the contacts 66 and 68 thus actuating a switch due to the magnetic field produced by the permanent magnet when the float 74 is, raised so that the magnet is generally centrally disposed in relation to the switch as illustrated in FIGURE 3.

In use, the slots 40 are orientated at or slightly above the top performation in the perforated tube 14 through which the fluid is pumped. The plastic tube 28 is of a 'suflicient length to locate the top inlet fitting 22 at the desired highest level of the fluid as at 18. The top inlet fitting 22 is substantially the same in configuration and shape as the bottom inlet or outlet fitting and also has radial grooves therein. A one or two wire cable 30 extends upwardly and outwardly from the top of the hole above ground Where the transformer or resistor and relay system are conveniently located. When the fluid in the hole rises to the level of the top inlet fitting, the fluid spills in through the fitting and is directed down through the plastic tube 28 and collects in the float chamber in the casing 26 above the valve member 44. When suflicient fluid has collected above the valve, it will raise the float 74 to its uppermost position which will close the switch contacts 66 and 68 which connects the circuit in a low voltage system which then will energize the solenoid thus opening the solenoid valve and also activate a relay for causing the pump motor to be started. The solenoid valve 52 stays in open position until the fluid is pumped down to the lowest level 16 so that the float will fall to its lowermost position and the switch contacts will separate thus deenergizing the solenoid and enabling the solenoid valve to close for preparation of the next cycle.

FIGURE 7 illustrates the pressure and flow method which has the same over-all characteristics as the first form of the invention including a tubular casing having an upper end plug or fitting 92 attached to the plastic tube 94 corresponding to the tube 28 which has an inlet fitting at the upper end thereof corresponding to the inlet fitting 22 in FIGURE 1. A conductor 96 passes through a passageway 98 in the fitting 92 and the plastic tube to control the pump motor and connect with a suitable transformer or power source for providing a low voltage source of electrical energy for energizing a solenoid 100 mounted on the lower end of the casing 90 with the solenoid 100 corresponding with the solenoid 58 in FIGURE 2. A bottom inlet or outlet fitting 102 is screwthreaded into the lower end of the casing 90 and the inlet fitting 102 corresponds to the inlet fitting 24 in FIGURE 2 for controlling the valve 104 in the same manner. The valve 104 is associated with a valve seat member 106 which has a passage 108 extending therethrough for selectively closing and opening by the valve member 104. The upper end of the valve member 106 is provided with an internally threaded axial extension 110 spaced concentrically from the casing 90 and provided with a plurality of inlet openings 112 therein for communicating the hollow interior 114 of the extension 110 with the interior of the casing 90. Screw-threadedly attached to the extension 110 is an adapter 116 having an externally and internally screw-threaded upper end portion. The externally threaded end of the adapter 116 is engaged with a cylindrical cap 118 having a microswitch 120 mounted therein and provided with an actuating button 122 engageable by a reciprocating plunger 124. An electrical conductor 126 is connected to the microswitch and a similar conductor 128 extends downwardly to the solenoid 100 to energize the solenoid when the microswitch 120 is closed which also actuates the pump motor.

The internally threaded upper end of the adapter 116 is provided with a guide plug 130 screwthreaded thereto which has a bore slidably receiving the plunger 124 for guiding reciprocation of the plunger. A compression coil spring 132 encircles that part of the plunger disposed below the guide plug 130 and the other end thereof engages a spring follower 134 connected to the plunger 124 thereby spring biasing the plunger 124 to a lowered position away from the microswitch 120.

The lower end of the plunger 124 is provided with an enlarged head 136 engaging a resilient diaphragm 138 extending across the upper end portion of the extension 110 and secured thereto in sealing relation so that the interior of the cap 118, adapter 116, and extension 110 above the diaphragm 138 will be sealed against entry of pressurized fluid which engages the undersurface of the diaphragm 138. Thus, when the fluid in the hole rises to the level of the top inlet fitting, the fluid spills in through the fitting and is directed down through the plastic tubing and collects at the bottom of the casing above the valve 104.which is in closed condition. When suflicient fluid is. connected above the valve, the static pressure generated will act on the diaphragm and cause the plunger to move upwardly thereby causing a contact to be made in the microswitch. This contact connects the circuit in the low voltage system, such as a 24-volt system which then opens the solenoid valve and activates the relay causing the pump to be started. The solenoid valve 104 stays in valve open position until thefluid is pumped down to the lowest level where the pressure is relieved on the pressure switch and the circuit is broken and the pump stops. At this point, the solenoid valve closes in preparation for the next cycle.

To compensate for the increased atmospheric pressure encountered at greater distance below sea level, an adjustment is provided by turning the plug 130 which varies the tension on the spring 132., Such adjustment may be marked to indicate the depth and this adjustment is made prior to installation of the device in the hole. The diaphragm 138 may be sealed in place by a suitable O-ring or the like and there is a relatively small space provided above the head 136 of the plunger 124 before it seats solidly but this distance is enough to enable contact to be made within the microswitch. The solid seating of the head of the plunger prevents the diaphragm from rupturing due to the pressure exerted thereon.

In addition to the structure disclosed, a suitable transformer to supply 24 volts or some other low voltage for the system is provided above ground together with a relay to convert the impulse received from this system to activate the line voltage required for the pump circuit. The various electrical components and details conform to conventional electrical practices. Also, a rheostat or the like may be provided to regulate the current to compensate for resistance in the cable to enable proper current to reach the control unit which may be located at varying depths in order to insure proper operation of the solenoid valve and the switch. The solenoid valve is especially designed in that it has longitudinal slots therein and the dimension thereof is slightly less than the tubular guide 60 to provide a flow passage therethrough when the valve is open. The flexible plastic tubing is sufliciently rigid to maintain a tubular passage which collects the fluid when a high level is reached and allows the fluid to flow or spill down through the tube and come to rest above the solenoid valve at the bottom of the control unit. When the suitable amount of fluid is collected to operate the switch, the well pump is activated and the reverse action is accomplished when the fluid is exhausted. The particular orientation of the actual high and low levels to be attained may be determined by the specific construction and configuration of the various components. For example, the permanent magnet may be such as to be retained in either of its initial positions until the force of the fluid has built up or reduced sufficiently that it will be moved from its extreme positions to close or open the switch contacts completely during its movement thus assuring that quick and positive operation of the switch contacts will be attained.

In practical operation a system has been provided wherein the required amount of current is fed in to operate the solenoid valve, the relay and overcome the cable wire resistance wherein the cable wire is the varying factor due to variable lengths or depth of holes. A standard hook-up or a standard design of a system is being provided to meet conditions for all holes to 3,000 feet deep. Resistors from 2 to watts are incorporated in the system for this standard hook-up and no transformer is used. With this method no adjustment is required at installation time. Another advantage of the resistor system assures proper setting of the electrical characteristics at installation. The device is located in the power line between the incoming 110 volt source and the pump motor. Two terminals are provided for the incoming 110 current in the control box and two terminalsforthe line to thepump motor. Between these two sets of terminals are two more to which the cable from the device in the wellare attached. The control box contains all instrumentation wired and ready to make the three simple connections.

In cases of deeper depths, if required, only a change in the resistors built into the system would be required, within reason.

'The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operationshown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A device for controlling operation of a pump motor for automatically activating a pump when a fluid level reaches a predetermined high point and automatically deactivating the pump when the fluid level reaches a low point comprising a tubular casing having a passageway in the bottom thereof for communicating with a fluid supply, the upper end of said casing being communicated with upper inlet meansfor communication with fluid when the fluid reaches a predetermined high level, a normally closed valve in said passageway in the casing to preclude inlet of fluid through the passageway so that fluid will have to enter the inlet means, and switch means in said casing responsive to inflow of fluid into the upper inlet means for closing a circuit to operate a pump motor for pumping the fluid, and means opening said valve in the passageway in the casing in response to operation of the pump motor for opening the valve in the casing whereby fluid in the casing will drain out through the passageway as the fluid level lowers to a predetermined point thereby opening the switch means for stopping the pump motor and closing the valve in the passageway in the casing.

2. The structure as defined in claim 1 wherein said switch means includes an actuator responsive to introduction of fluid into the casing.

3. The structure as defined in claim 2 wherein said actuator is in the form 01f a float, guide means in the casing for said float, said float having a permanent magnet thereon, and a proximity switch means orientated at a position alongside of the permanent magnet when to float raises the permanent magnet in response to inflow of fluid into the casing for closing the switch to actuate the pump motor and open the valve in the passageway in the casing.

4. The structure as defined in claim 2 wherein said actuator includes a plunger, a microswi-tch having an actuating button in the path of movement of the plunger, said plunger having a head theron, a diaphragm attached to the head, an adapter sealingly engaged with said diaphragm and having fluid inlet means below the diaphragm whereby inflow of fluid into the casing will exert pressure on the diaphragm for moving the plunger thereby actuating the switch for operating the pump motor and opening the valve in the passageway in the casing.

5. The structure as defined in claim 1 wherein said valve in the passageway in the casing is a solenoid operated valve for opening upon completion of a circuit to start the pump motor thus communicating the interior of the casing with the fluid supply whereby the means in the casing will automatically deactivate the pump when the fluid level drops to a predetermined point.

6. The structure as defined in claim 5 wherein said casing includes a plug having a conical end and a,longitudinal bore therethrough forming a portion of said passageway, said conical end having transversely extending slots communicating with the bore for facilitating exit of fluid.

7. The structure as defined in claim 6 wherein said upper inlet means includes an elongated plastic tube, an inlet fitting mounted on the upper end of said plastic tube, said inlet fitting having a conical tapered upper end portion with transverse grooves therein communicating with the longitudinal bore in the fitting and communicating with the plastic tube.

8. A control assembly for controlling operation of a pump for removing liquid from a reservoir in which the supply therein is bfilnlg replenished so that the pump will be activated when the level in the reservoir reaches a predetermined level and become deactivated when the pump lowers the level in the reservoir to a predetermined lower level comprising a vertically orientated casing having a passageway in the bottom thereof communicated with the reservoir, valve means in said passageway for selectively closing the same, inlet means communicated with the casing for admitting fluid into the casing when.

the level in the reservoir reaches a predetermined high point, means in said casing responsive to inflow of fluid for actuating a pump when the level in the reservoir reaches the predetermined high point and falls into the casing, said means in said casing also actuating the valve means for opening the valve means in the passageway thereby communicating the passageway in the bottom of the casing with the reservoir sot-hat the pump will remain actuated until the level in the reservoir References Cited by the Examiner UNITED STATES PATENTS 1,511,432 10/1924 Skidmore 103-25 1,979,149 10/1934 War-rick .103--26 2,495,149 1/ 19-50 Taylor 20084.3 2,635,546 4/1953 Enyeart et al.- 103-26 2,869,475 1/1959 .Bobo 200--8-4.3 2,968,707 1/ 1961 Martin et a1. 103-25 3,013,135 12/1961 Russo ZOO-84.3

FOREIGN PATENTS 59,970 9/ 1947 Netherlands.

MARK NEWMAN, PrimaryExaminer.

SAMUEL LEVINE, Examiner.

W. L. FREEH, Assistant Examiner.

Claims (1)

1. A DEVICE FOR CONTROLLING OPERATION OF A PUMP MOTOR FOR AUTOMATICALLY ACTIVATING A PUMP WHEN A FLUID LEVEL REACHES A PREDETERMINED HIGH POINT AND AUTOMATICALLY DEACTIVATING THE PUMP WHEN THE FLUID LEVEL REACHES A LOW POINT COMPRISING A TUBULAR CASING HAVING A PASSAGEWAY IN THE BOTTOM THEREOF FOR COMMUNICATING WITH A FLUID SUPPLY, THE UPPER END OF SAID CASING BEING COMMUNICATED WITH UPPER INLET MEANS FOR COMMUNICATION WITH FLUID WHEN THE FLUID REACHES A PREDETERMINED HIGH LEVEL, A NORMALLY CLOSED VALVE IN SAID PASSAGEWAY SO THAT PRECLUDE INLET OF FLUID THROUGH THE PASSAGEWAY SO THAT FLUID WILL HAVE TO ENTER THE INLET MEANS, AND SWITCH MEANS IN SAID CASING RESPONSIVE TO INFLOW OF FLUID INTO THE UPPER INLET MEANS FOR CLOSING A CIRCUIT TO OPERATE A PUMP MOTOR FOR PUMPING THE FLUID, AND MEANS OPENING SAID VALVE IN THE PASSAGEWAY IN THE CASING IN RESPONSE TO OPERATION OF THE PUMP MOTOR FOR OPENING THE VALVE IN THE CASING WHEREBY FLUID IN THE CASING WILL DRAIN OUT THROUGH THE PASSAGEWAY AS THE FLUID LEVEL LOWERS TO A PREDETERMINED POINT THEREBY OPENING THE SWITCH MEANS FOR STOPPING THE PUMP MOTOR AND CLOSING THE VALVE IN THE PASSAGEWAY IN THE CASING.
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318247A (en) * 1965-03-12 1967-05-09 Clyde E Yost Automatic pump control
US3421538A (en) * 1966-02-10 1969-01-14 Talmage Hocker Liquid level control
US3684400A (en) * 1970-10-26 1972-08-15 Tait Mfg Co The Submersible pump and control system
US3749526A (en) * 1970-05-23 1973-07-31 Pirelli Pumping apparatus with two separated fluid systems
US3811793A (en) * 1969-06-03 1974-05-21 Komatsu Mfg Co Ltd Safety device for detecting water level in a water tight chamber of an amphibian bulldozer
US3924086A (en) * 1974-03-27 1975-12-02 Robertshaw Controls Co Pressure responsive magnetic switch
US3989911A (en) * 1975-09-05 1976-11-02 Perry Joseph A Magnetic differential pressure switch
US4021144A (en) * 1975-09-17 1977-05-03 Elepon Kabushiki Kaisha Submersible pump with float switch
US4025237A (en) * 1975-10-22 1977-05-24 French George F Latching magnetic level sensor
US4934458A (en) * 1988-03-10 1990-06-19 Warburton James G Small diameter dual pump pollutant recovery system
US4943210A (en) * 1988-10-03 1990-07-24 Bailey Jr James R Pump control system, level sensor switch and switch housing
US4972709A (en) * 1988-10-03 1990-11-27 Bailey Jr James R Pump control system, level sensor switch and switch housing
US5099920A (en) * 1988-03-10 1992-03-31 Warburton James G Small diameter dual pump pollutant recovery system
US5173579A (en) * 1992-01-09 1992-12-22 Precision General, Inc. Differential pressure switch including a vertical diaphragm, a reed switch activated by a first magnet and additional magnets for positioning the diaphragm and the first magnet
US20140000875A1 (en) * 2008-08-15 2014-01-02 Cnx Gas Company Llc Down-hole Liquid Level Control for Hydrocarbon Wells

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL59970C (en) *
US1511432A (en) * 1922-10-26 1924-10-14 Jr Benjamin Skidmore Means for automatically actuating control devices
US1979149A (en) * 1930-10-30 1934-10-30 S I Pirelli Stop joint for liquid filled cables
US2495149A (en) * 1946-03-23 1950-01-17 William H Taylor Magnet-operated switch
US2635546A (en) * 1949-01-05 1953-04-21 Harold F Enyeart Pump control
US2869475A (en) * 1951-12-21 1959-01-20 Phillips Petroleum Co Control system
US2968707A (en) * 1956-11-20 1961-01-17 Perfect Circle Corp Control means for oil well pumps
US3013135A (en) * 1960-05-06 1961-12-12 John R Russo Magnetic float control

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL59970C (en) *
US1511432A (en) * 1922-10-26 1924-10-14 Jr Benjamin Skidmore Means for automatically actuating control devices
US1979149A (en) * 1930-10-30 1934-10-30 S I Pirelli Stop joint for liquid filled cables
US2495149A (en) * 1946-03-23 1950-01-17 William H Taylor Magnet-operated switch
US2635546A (en) * 1949-01-05 1953-04-21 Harold F Enyeart Pump control
US2869475A (en) * 1951-12-21 1959-01-20 Phillips Petroleum Co Control system
US2968707A (en) * 1956-11-20 1961-01-17 Perfect Circle Corp Control means for oil well pumps
US3013135A (en) * 1960-05-06 1961-12-12 John R Russo Magnetic float control

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318247A (en) * 1965-03-12 1967-05-09 Clyde E Yost Automatic pump control
US3421538A (en) * 1966-02-10 1969-01-14 Talmage Hocker Liquid level control
US3811793A (en) * 1969-06-03 1974-05-21 Komatsu Mfg Co Ltd Safety device for detecting water level in a water tight chamber of an amphibian bulldozer
US3749526A (en) * 1970-05-23 1973-07-31 Pirelli Pumping apparatus with two separated fluid systems
US3684400A (en) * 1970-10-26 1972-08-15 Tait Mfg Co The Submersible pump and control system
US3924086A (en) * 1974-03-27 1975-12-02 Robertshaw Controls Co Pressure responsive magnetic switch
US3989911A (en) * 1975-09-05 1976-11-02 Perry Joseph A Magnetic differential pressure switch
US4021144A (en) * 1975-09-17 1977-05-03 Elepon Kabushiki Kaisha Submersible pump with float switch
US4025237A (en) * 1975-10-22 1977-05-24 French George F Latching magnetic level sensor
US4934458A (en) * 1988-03-10 1990-06-19 Warburton James G Small diameter dual pump pollutant recovery system
US5099920A (en) * 1988-03-10 1992-03-31 Warburton James G Small diameter dual pump pollutant recovery system
US4943210A (en) * 1988-10-03 1990-07-24 Bailey Jr James R Pump control system, level sensor switch and switch housing
US4972709A (en) * 1988-10-03 1990-11-27 Bailey Jr James R Pump control system, level sensor switch and switch housing
US5173579A (en) * 1992-01-09 1992-12-22 Precision General, Inc. Differential pressure switch including a vertical diaphragm, a reed switch activated by a first magnet and additional magnets for positioning the diaphragm and the first magnet
US20140000875A1 (en) * 2008-08-15 2014-01-02 Cnx Gas Company Llc Down-hole Liquid Level Control for Hydrocarbon Wells
US9453394B2 (en) * 2008-08-15 2016-09-27 Cnx Gas Company Llc Down-hole liquid level control for hydrocarbon wells

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