Патент USA US2134465код для вставки
0er. v25, A193.3. J. E. LAACY coMPnEssED AIR @EEP WELL .MMP Filed sem.. i510, 1956V .143 244 ói.; 246 ï" ¿36' 1.25/ 138/ 7 g, U0.0 .2 sheèt-s-sneet 1 Oct. 25, 1938. J.- E. LACY 2,134,465 I CÜMDDFESSED AÍR DEEPAWELL PUMP Filed septl. so. 193e 7i 55- / ¿a Í i l j 20/ »ya I A l 35 ' 3 ’« 42 39 L ? 96“ l \ 2 shee'tsèsneet 2 l ; / " 7/95’ ` Invenìor. - l 37 n \ James E. Lac . Hi ioz'neys. Patented Oct. 25, 1938 UNITED „STATES PATENT GFFICE. 2,134,465? COMPRESSÈD AIR DEEP WELL PUMP James E. Lacy, Los Angeles, Calif., assigner of one-half to Richard H. Lacy, San Marino, Calif. « -Application September 30, 1936, Serial No. 103,338 . '7 Claims. (Cl. 10S-46) My invention relates to a deep Well pump such - as the piston for ‘the compressedair engine and as a pump suitable for pumping- oilxfrom bored wells ,or for pumping water or water with min erals in solution fromv considerable depths fbelow 5 the surface of the earth. An object and feature of my invention is to as the plunger fc r the oil pump. . Another detail feature of my invention is in controlling the _air valves by a cam which posi tively rotates the valves a suñ‘icient amount to open the air valve for admitting air to the air use compressed -air as the motive force for pump . engine on the power stroke and giving a reverse ing the oil or other liquid and in which the pump motion for exhaust.- The cam for operating the assembly is located at the desired depth in the well for receiving the oil or other liquid, which rotary valve is preferably actuated by a recipro-` eating cross-head having a cam mounted there- 10 liquid is positively elevated by a plunger pump, the .plunger being operated by an air engine o`n, which cross-head is positively depressed by ~ pumps and thus positively elevates the oil to a suflicient air to lift a heavy load 'of oll or other the weight of oil above the pump. -To effect this having a cylinder and a piston. An advantage of operation a small duct communicates with the my construction is that the only moving partsl oil in the oil tubing above the pump and leads` 5 are the piston of the air motor and the plunger to a small diameter but elongated cylinder hav of the oil pump together with the actuation of ing a piston with a connecting rod therein, the the control valves.> Hence there are no long rod operating the cross-head. Another feature reciprocating partssuch as the sucker rods in of my invention relates to a construction of the the ordinary pumps leadingl down into' the well. air engine by providing a plurality of compara tively small air valves connected with the com- 0 20 ‘ Another general‘object 'and feature of my in vention is pumping the oil or other liquid from pressed air line through the medium of a mani deep'wells' in stages. That is, the lowermost fold.> By this construction comparatively small pump is located at the bottom of the well which air valves can be utilized to admit and exhaust 25 higher elevation-where it flows into a sealed-off chamber in the well in which the next higher pump is located, the oil being pumped upwardly through a string of oil pipe. Thus by having a succession >of pumps.. eachw of which is operated 30 by compressed air, the oil maybe elevatedby stages from the bottom to the top of the well. A further feature of my invention resides in using separate air conduits or pipes connecting from vthe top of the well and an air compressor plant 35 to the individual pumps. Thus by using a proper timing arrangement the pumps can be operated. in a sequence, hence as only a comparatively small amount of compressed air is required for any one pump, it is not necessary to have a very 40 large Aor expensive compressor plant, although of course it is desirable to use the air lat high pressure in the individual pumps. 1 Another object and feature of my invention is in arranging the pumps and their construc 45 tion suitable for use in a well in which the cas ing tapers in stages from the top to the bottom of the well, being smallest at the bottom. Hence as it is desirable to have as large a diameter oil pipe as possible, the lowermost pump may have the pump plunger and the piston of the air - motor or engine substantially the full diameter of the oil pipe or tube. In this case the cylinder _in which the piston operates for the air engine also functions as a cylinder for use in pumping 55 the oil. In fact, the piston may function bothv liquid. . - 25 - My invention is illustrated in connection with the accompanying drawings, in which: Fig. 1 is a vertical section through a well cas ingfwith the pump assemblies in elevation. In actual practice, however, each pump assembly may be much longer in its relation to its diam eter and the diameter of the casing and the oil pipe. y y Fig. 2 is a vertical section taken on the line 2--2 of Fig. 8 of a form of pump suitable for a small diameter well casing. In thisl instance the pump barrel is the same or substantially the same diameter as the oil pipe through which the oil is pumped upwardly. » Fig. 3 is a verticalsection taken substantially on the section lines 3-3 of Figs. 4, 5, and 6 show ing a construction of pump suitable for the upper stages in pumping where the >well casing is of larger diameter and the pump barrel of greater 4 . diameter than the oil pipe. 5 Fig. `4 is a horizontal section on the line 4-4 of Fig. 3" looking upwardly in thel direction of the arrows. » „ - Fig. 5 is a horizontal section on the line 5--5 of Fig. 3 looking downwardly in the direction of the arrows. . ' ' Fig. 6 is a horizontal section on the line 6--6 of Fig. 3 looking downwardly in the direction of the arrows. « ' ' Fig. '7 is a horizontal section on the line 1-1 2 8,184,465 of Fig. 3 looking downwardly in the direction ' long arms secured to the rods 54. A circular oil of the arrows, this ñgure being on a smaller scale manifold 58 is located above the upper head 23 than Figs. 4, 5, and 6. . and supplied by oil by a small bore oil pipe 58 Fig. 8 is a horizontal section on the line 8_8 ' extending upwardly along the oil cylinder v28 and of Fig. 2 looking downwardly in the direction of being connected as indicated at 68 to the upper part of the cylinder 28 above the ilap check valve Fig. 9 is a detail perspective partly broken. 6I, this being pivoted at 62. A radial oil lead away of one of the air control valves. l63 extends from the manifold to the upper Referring first to Fig. l, the oil well casing pipe end of each of the small bore pipes 5,8 (note Figs. 10 indicated by the numeral || has a lower section 3 and 7). 'I'he inlet for oil to the- oil pump is I2 with the perforations I3 for the inflow of oil through the inlet elbow pipe 64 (note Fig. 3), or other liquid, this being at the bottom of the this having a check valve 65 therein, such valve well and is usually of much smaller diameter~ being operative for inñow of oil from the oil than for instance, an upper vsection I4. There 15 fore when pumping is done in stages it is> usually chamber 43 surroundingÍ the pump to the oil cylinder~ 29 but preventing outñow on the up impractical to have a large~diameter pump at stroke. The small oil vent 66 is provided in the the bottom oi a well. The lowermost pump is head 23 for inflow and ejection of oil above the indicated by the numeral |5 and is shown in plunger 24 during the reciprocating motion of detail in Figs. 2 and 8, using however the valve this plunger under the action of compressed air. 20 construction of Fig. 9. An upper or larger diam The air supply and control assembly designated eter pump is indicated by the numeral I8 and by the numeral 15 includes _a plurality of indi 20 illustrated particularly in Figs. 3 through 'l vidual air valves 16, th ee of these being illus having the valve of Fig. 9. ' the arrows on the same scale as Fig.> 2. The upper type of pump is constructed sub 25 stantially as follows, having reference particu larly to Figs. 3 through 7 and 9. An outer cyl-v inder or case 28 encloses the cylindrical motor barrel 2| which barrel has a lower head 22 and an upper head 23, preferably connected thereto The motor plunger or piston 24 is slidably mounted in the barrel and has a central rod 25 which extends downwardly through a guide opening 26 in the lower head 22. A'piston rod 21 also connected to the plunger 24 extends upwardly through a guide opening 28 in 30 by a threaded connection. the upper head 23.@ To this upper head is con nected an oil pump cylinder 28 having the oil pumping piston 38.mounted~ on. the upper end of the piston rod and working in this cylinder. The 40 upper or smallv diameter string of oil pipe 3| con nects to the oil pump cylinder 28 and extends up wardly in the well. p I - ' 4 The lower end of the cylindrical case 28 is pro vided with an end head 35 with a guide opening This is preferably screw threaded into the lower end of trated, the details bein presented in Figs. 3,'4, 5 and 9. Each valve has 'a cylindrical valve casing 1.1 extending downwardly from the lower head 22 25 which head has an inlet port 18 and an outlet port 19, these being arranged concentric with the axis of the rotary cylindrical valve plug 88. Such plug has right angular inlet air passage 8| and a longitudinal outlet air passage 82 (note particu 30 larly Figs. 3 and 9), the inlet` passage being of larger diameter than the outlet passage. Air is supplied through a circular air manifold 83 lo cated below the head 22 and connected to open ings 84 through the valve casing 11. A vertical 35 air compressed pipe 85 has a. connection’to the manifold 83 and passes upwardly in the annular space 5| between the cylindrical case 28, and the motor barrel 2|, this having an upward lead L86 with couplings 81 following upwardly on the oilv 40 pipe string to the top of the well where such pipe is connected to a suitableair compressor or a controlled storage tank of compressed air. 'I'he actuating mechanism for the valves desig nated by the assembly numeral 88 employs tubes 45 8|, each connected at its upper end to a valve the cylinder. This cylinder 20 terminates at the plug 88, the outlet passage 82 discharging down bottom in a reduction head 31 having va ilange 38 v wardly through the pipe 8|. Each pipe has a to which the lower string of oil tubing 38 is -con reduced journal end 82 connected to its lower 50 nected, this leading upwardly from the lower end, this having a bearing 83 in the head 35 50 pump I5. Thus there is an oil chamber 48 pro adjacent the lower end of the cylindrical case 28, vided below the head 35 and havingoil flow open there being a central air discharge perforation 84 ings 4|. An annular packer 42 of any suitable through the head 35 and the journal end 82. type seals off the lower portion ofthe pump I6 -The pipe. 8| is provided with an upper radially 55 with the well casing, the packer being below the projecting pin-85 and a lower radially projecting openings or perforations 4| to allow upflow of oil pin 86, these being at 88 degrees to each other. 55 into an upper annular oil chamber 43 between the The cross head carries three cams, each indi cylindrical case 28 of the pump I6 and the well cated by the numeral 100 and secured to the casing. 45 36 for the rod 25 and perforations 35'. 60 A series of small oil reaction cylinders 58, these being shown as three in number as indicated in. Fig. 6, extend downwardly in the annular space 5I between the casing cylinder 28 and the motor barrel 2|.' 'I'hese preferably have a snug ñt and 65 by means of welded iillets 52 properly center and retain the motor cylinder mounted in a concen tric and fixed position in reference to'. the cylinder case 28. In each of these small pipes or cylinders there is mounted a piston 53 with a downwardly 70 extending4 piston rod 54, this being connected to a cross-head 55. The cross head is shown in Figs. 4 and 5 as a series of radial arms 56 leading from a central hub 51 through which hub the rod 25 passes, the hub being rigidly secured to the 75 rod. The cross-head is shown as having three cross head hub 51 by short arms |8| (note Figs. 3, 4 and 5). ~Each of these cams has an upwardly 60 sloping face |82 and a lower sloping face |83 so that on the. upward movement of the cross-head 55 l'when the pump plunger 24 moves up, the face |82 engages >the upper pin 85 and causes a rotation of the valve plug in one direction. Like wise when the cross-head moves downwardly due to its rigid attachment to the rod 25 and the 65, lower face |83 engages the pin 86, the tube >8| and the valve plug 88 is rotated in the opposite direction. 70 It will be apparent that instead of having the cylindrical case 28 and the motor." barrel 2| formed as two separate elements with an annular space 5| therebetween, these can be made inte gral with longitudinal bores forming a provision 75 2,134,465 for the small reaction cylinders 50 and for the compressed air duct 85, as it is not really essential ` that there’be an annular space such as 5|. Also, in some cases where there is sufficient diameter in the well casing to have relatively large valves, one air valve may be utilized instead of a plu rality of smaller valves. Also in some cases in stead of >having the reaction pistons 53 to effect the' positive downward movement of the cross 10 head and'hence of the cams |00, the weight of 3 the outlet passage 82 ñows downwardly throughl the pipe 9|, the discharge perforation 94, into the oil chamber 40 and hence outwardly through the oil flow openings' 4| or the perforations 35 and thus mingles with the oil conñnedin the well cas ing flowing upwardly through this oil and eventu ally being discharged from the top of the well. It will be apparent that the motor-barrel and the length of stroke provided for the cross-head 55 may be as long as desired to give a considerable 10 lift at each stroke to' a comparatively small vol ume of oil, the volume being regulated by the dl ameter of the oil cylinder 29 and the length of the stroke of the oil piston 30. Inthis arrange ment the air is always under constant compres the plunger 24 or weights attached to the rod 25 may be suflicient for this purpose. It will be noted that the small pistons 53 are always subject to the hydraulic head due to the weight of oil or 15 other liquid above the flap valve 8| to the upper i sion in the air pipes 86 and 35, supplying air to end of the particular length of oil pipe 3|'. the valves, -hence the rapidity of the stroke is dependent on the air pressure,lthe weight of the trated particularly in -Figs. 3 to '7 and 9, is sub- ' column of oil being elevated and the speed with 20 which the plunger 24 descends. 20 stantially as follows: Presuming the plunger 24 The type of pump such as I5 for use in they is at the bottom of its stroke adjacent the lower lowermostpart‘of a well where the diameter of, head 22 of the motor barrel, then the cross head 55 is at the lower part of its stroke and the lower the casing is not suflicient to accommodate the face |03 of the cam |00 engages the pin 96 of larger pump such as designated at I6, is’ con 25 structed substantially as follows, having refer 25 the tube 9|, thus rotating and positioning the ence particularly to Figs. 2, 8 and 9. This in its valve plug 80 to align the inlet passage 8| with main feature's is the same as the pump I5 above the air openings 84 to the manifold to allow com pressed air to enter through the inlet port 18 described. An elongated cylindrical case |25 has a lower perforated head |26 with perforations in the head 22, this compressed air as above men |21 and a central guide opening |28, which head 30 30 tioned, .being fed downwardly through the air may be threaded intothe lower end of this cylin pipe 86 and 85 and the manifold 83. As the pis concentrically mounted in the case as a corn-` ton rod 21 is carried downwardly by the plunger der compressed air and oil lift cylinder |30, 24, the oil piston 30 is likewise lowered causing an bination the lower end |3| of which is4 provided for the inflow of oil from the annular space between the compressed air and the upper portion I 3|’ for 35 35 well casing and the pump through the -inlet 64 oil to be lifted. A combination air plunger having the check valve 65. In this action the the and _oil piston |32 is mounted in the cylinder |30 downflow of oil retained in the upper part of the and has a rod |33 extending downwardly through cylinder and the oil pipe 3| is prevented by the a guide opening |34 in the lower head |35 of the flap valve 6|. The compressed air below the cylinder |30. This rod _extends downwardly 40 40 plunger 24 gives an upward stroke to its plunger, through the guide opening |28. There are small which' it will be noted, is of very much larger area tubes |36 forming oil cylinders located be- ' than the oil piston 30. This creates a lift of bore tween the case |25 and cylinder |30 and having the oil in the oil pump cylinder 29 closing the check valve 65 and opening the flap valve 6I for the function of the reaction cylinders 50, each The manner of operation and functioning of the pump assembly designated as l0 and illus being provided with a plunger |31 and a rod |38 45 extending downwardly and connected to a cross elevating the cams |00 and also by means of the _ head |39. This cross head is similar to the cross rods 5,4, thrusting the small pistons 53 upwardly. head 55 and secured to the rod |33.` IThe cross -Any oil which has entered through the vent 66 head is provided with cams |00 and operates the same type of valve indicated at 15 as shown in 50 above the plunger 24 in the motor barrel is ex 50 connection with the pump of Fig. 3. In this case pelled through this vent. When the upper slop ing surface |02 ofthe cam |00 engages the upper however, the tubes |40 extend downwardly from ~ pin 95 o'n the tube 9| it rotates the pin and the the Valve plug having a perforated lower bearing ' tube and hence the valve plug 80 one-quarter |4| in the lower head |26, the exhaust air being discharged downwardly through these pipes |40. 55 55 turn, thus dis-aligning the intake passage 8| with It will be noted in the construction of the valve the intake port 19 and bringing the outlet air 45 upflow of oil in the oil pipe 3|. «At the same time the rod 25 carries the cross head 55 upwardly passage ,82' in the plug into alignment with the outletl port 19. This releases the air pressure in the motor barrel below the plunger 24 allowing 60 this to descend. As the small pistons 53 are al Ways subject to the hydraulic head of the oil in the manifold 58, the small bore pipe 59 and the ` `oil string 3|', these pistons are positively forced downwardly when there is no air pressure to 65 cause their elevation. Thus even if there is a resistance to the outflow of. air from below the plunger‘24, the cross-head 55 positively exerts a downward pull on the rod 25 and hencei‘orrthe plunger. The first action of the downward move 70 ment of the piston 30 is to cause a closing of ñap -valve 6|, thus trapping the oil above such valve. However as above described, in certain cases the small pistons 53 with the rods 54, the oil duct 59 andthe manifold 58, may be discarded. The 75 exhaust air as above described as passing through of Figs. 2 and 8 that the cylinderv|3g0 is of the same diameter as the oil tubing 39 through which the oil is vpumped upwardly. An oil inlet |42 hav ing a check valve is provided and located below 60 the pivoted flap valve |43. A small bore oil duct |44 connects to the cylinder |30 on the oil tubing 39 above the l'lap valve |43 and connects to an annular manifold |45 (note (Fig. 8), this having connections |46`to each. of the small oil cylinders |36. . The compressed air is brought downwardly by a compressed air pipe |41 which leads through the annular space between the case |25 and the cylinder |30 and leads to a manifold |48 located . surrounding the valve assembly 15 and supplies air to these valves in the same manner as the similar manifold of the pump of Fig. 3. This air pipe |41 leads upwardly through the upper pumps I6 either through the annular ,space 5|. or through special bores provided. By this con 75 4 l i 2,184,465 -struction there is a separate air pille supply to connecting said small piston andthe rod con each of the pumps when these are arranged in ï nected to the plunger and a liquid connection ` l stages. The operation of the pump l5 considered as an 'individual pump is substantially the same as thepump of Fig. 3, except in this case the area oi' the plunger |32 on which the air operates is slightly less than the upper area lifting the column of -oil. On account of this lower pump being de 10 signed for use in the lower contracted end of the well casing 'where the oil ilows in through- the perforated casingvfrom the oil sand, it is desirable that this type of pump have a greater lift than the pump of Fig. 3. ' / - 'I‘he operation 'of an assembly of pumps for lifting the oil in stages is as follows, having ref erence particularly to Fig. 1: The pump I5 is operated by its own air line and lifts the oil through the lower string of oil tubing 39 which 20 is‘ connected as shown in Fig. 3 to the lower end of the cylindrical case‘ 2q of the larger pump I6 next thereabove. The oil is discharged into _the oil chamber 40 and ilows `outwardly through the ports or perforations Il in the cyl 25 inder 20 (note Fig. 3) into the annular chamber 43 deiined by the packer 42, the upper section from theV small bore cylinder above its piston to the liquid in the liquid tube. f 2. In a deep well pump in which a well bore is provided with a well casing, a gas motor fitted in the casing, a liquid pump connected there 5 , to. a , gas supply pipe for the motor and a liquid pipe connecting from said pump upward ly in the well,-the motor having a movable ele ment combined with a return mechanism for the moving element of the motor having a liquid pressure connection to the liquid in thel said liquid pipe> to positively return the moving ele ment of the pump to its initial position. 15 3. In a deep well pump in which a well bore is provided with a well casing, a gas motor hav ing a reciprocating piston and ailiquid pump also having a reciprocating piston, the pistons being connected, al gas supply pipe for the motor 20 leading upwardly in the well, a liquid discharge pipe from the pump extending upwardly in the well combined with aireturn mechanismv for the piston of theA pump having a liquid connection to the liquid in the liquid pipe constructed and 25 adapted to maintain a liquid pressure due to Il of the well casing and the cylindrical case the head _'of liquid in the pipe with means 20, the oil being always maintained at a level A urging the motor piston downwardly, the pres well above the oil intake 64. Therefore the 30 upper pump I6 operating on its own air system vsure of the gas being adapted to overcome the downward u'rge on the pumping stroke of the 30 gives the oil a lift in the second stage upwardly motor and the pump. through the string of oil pipe 3|. This in its 4_. In a deep well pump as claimed in claim 3, turn may be connected to a similar pump much the liquid return mechanism including one or in the same manner as the oil tubing 39 is con 35 nected‘to the pipe i6. Thus by having a series more small- bore cyinders each with a piston therein with a liquid connection from the cyl 35 of ` pumps which may increase in size as de~ inder or cylinders to the discharge liquid pipe sired as the well casing increases in diameter together with means connecting the small pis towards the top of the well, the oil may be ton or pistons to the piston of the gas motor. pumped in succeeding stages from the bottom .5. In a deep well’pump, the combination of 40 to the top of the well for discharge in the usual a cylindrical case having a iìrst cylinder for air- 40 manner. In order to economize on the size of mounted concentrically therein, said cylinder the air compressor plant, this may be arranged having av lowe'r head with a guide opening, the -to form a connection to the various air supply said case having a lower head with a `second lines for the diñ’erent pumps in a sequence so 45 that one pump actuates on its lift at a time and it is not necessary to supply at one time enough guide opening, a plunger mounted in the iirst cylinder and having-a‘road extending through the guide openings in the head of the cylinder 45 air to operate all of the pumps simultaneously. and the lower head of the case, the lower head It will be apparent however, if desired, that all )of the cylinder having inlet and exhaust ports, of the pumps may be connected to the same air 50 line, in which case it will be only necessary to run one line of air pipe from the surface to the ground to the lowermost pump, this being tapped off to the manifolds of the various pumps used a valve having a rotary plug with inlet and ex haust passages, a compressed air connection from the said valve to the top of the well, a re 50 ciprocating actuating means for the valve con nected to the said road and a valve moving de vice connected to the valve plug to be engaged 55 Various changes may be made in the details by the said ‘actuating means to operate the said ofthe construction without departing from ,the valve to align the said passage respectively with 55 l spirit or scope oi' the invention as defined by the-> the said ports, and a liquid cylinder connected appended claims. to the first cylinder having the valve, said liquid I claim: cylinder having a piston connected to the plung 1. In a deep well pump, the combination o1' er, a liquid tube extending Iupwardly from the in the stages above the lowermost. an outer case structure, a combined air and _ liquid cylinder and having a check valve there liquid cylinder havi-ng a plunger therein with a in and an intake for liquid with a second check rod connected to the- plunger, aA liquid tube con - valve below the ñrst check valve, the rod having nected to the upper end of the liquid cylinder a cross-head connected thereto, a small bore cyl-v 65 and having a check valve with an inlet there inder positioned between the case and the first cylinder and having a small piston therein with 65 below, a valve for the air cylinder, a com pressed air connection from the top of the well a piston rod connected to the said cross-head, a to the said valve, a valve operating means hav liquid connection from thef upper end of the ing a movable element connected to the said small cylinder above its piston to the liquid tube rod, with valve rotating elements operatively above the check valve ot said tube whereby the positioned to be engaged thereby, the >valve hav small piston is always subject to the hydraulic 70 ing an inlet and an exhausty passage for air, a." head of the liquid contained in the said liquid . means to positively move the plunger down tube for returning the cross-head and the said wardly comprising a small bore cylinder having a small piston -therein with an Operative means plunger to its lowermost position after a lifting stroke. ` i . 75 2,134,465 6. In a deep well pump, an air motor cylinder having a head at the bottom with a guide open ing therethrough, a plurality of air valves mount ed on the lower head and having inlet and ex haustv passages, an air manifold having a con nection to the inlet passages, a compressed air connection from the manifold to the upper part of the well, a motor pump plunger in the cylin der having a rod extending downwardly through 10 the guide opening in the head, a valve actuating _ 5 the small pistons are always subjectto the hy draulic head of the liquid in the liquid tube. 7. In a deep well pump acompressed gas mo tor and an oil pump connected together, the mo tor having a cylinder with a piston operating therein and the pump having a cylinder with a ' pump piston operating therein, the said pistons being connected together, an oil inlet to the oil pump above the level of the uppermost travel of the pump piston, a valve connected to the lower 10 end of the motor cylinder, a conduit for com means having a portion thereof secured to said rod to reciprocate therewith to actuate the valves pressed gas extending downwardly and connected to the valve, a cross-head connected to the pis simultaneously from an inlet to an exhaust posi tion, a liquid pump having a cylinder connected . ton of the motor, a cam on said cross-head and an interacting means between the cam and the 15 to the cylinder of the air motor with a piston valve to rotate the valve, such valve having an connected to the plunger, a liquid inlet above exhaust opening communicating with the well, the piston, a check valve above the inlet and a a small bore cylinder positioned adjacent the liquid tube extending upwardly from the liquid motor cylinder having a small piston therein, pump cylinder, _the valve actuating means in-Í an oil connection from the upper end of the 20 cluding a' cross-head, a plurality of small liquid -cylinder to a position above a check valve of the cylinders connected to the air pump cylinder and oil pump to always maintain an oil pressure on each having a small piston, secondary piston rods the piston of the small cylinder-and a rod con between each small piston and cross-head, a liquid manifold vconnected to the upper end of each of the small cylinders, a liquid connection necting the small piston with a cross-head where by the small piston and said rod always exerts a 25 from Vsaid manifold to the liquid pump cylinder above the check valve of said cylinder whereby hence on the motor piston. downward movement in the cross-head and - ` ` , JAMES E. LACY.