US2363343A - Gas eliminator - Google Patents

Description

Nov. 21, 1944.l R. M. LINDGREN GAS ELIMINATOR Filed Sept. 22, 1941 `3 Sheets-Sheet l INVENTOR. BY ROBE/P7' M. M25/PEN 3 Sheets-Sheet: 2

GAS ELIMINATOR R. M. LINDGREN Filed Sept. 22, 194;

Nov. 21, 1944.

Y' INVENT OR.

Nov. 21, 1944. R, M, UNDGREN 2,363,343

' GAS ELIMINATOR Filed Sept. 22, 1941 3 Sheets-Sheet 3 y tially filled with gas.

Patented Nov. 21, 1944 L'JNrrloy `sfn rr13sl PATENT OFFICE 'Robert M. Lindlgrrcn, Detroit, Mich., assignor lto t'roit, Mich., a corporation Deep Wells, Inc., De

of MichiganA A' Application september 22, 1941, serial N0.f411,s77

12 Claims. (c1. 10s- 20%)rv e My invention relates to a. new and useful gas eliminatoradapted for use primarily on oil wells.

In a very common type of oil well pump a tubular member is provided which is reciprocated and carries a valve knownA as atraveling valve.- Below the traveling valve is a stationary valve and the construction of these parts is such, and these valves are so constructed and arranged, that when-the tubular reciprocating member moves,

downwardly thevtravelingvvalve opens and alV standing valve below moves into open position allowing liquid to flow into the chamber above the standing valve.- Where gas is present frequently-thewspace between the traveling valve and the standing valvel becomes vfilled or par- When the tubular member is forced downwardly the traveling valve isheld on the seat bythe amount of'` liquid positioned above. When the space below is filled with liquid the pressurefof the liquid is-suflicient to lift the condition /exists lthe pumping of liquid by 'fthe pump ceases and thus, what is commonly known as av gas lock has developed.`

'It is an object of Ythe present invention toy pro- .vide a pump structure so arranged as, to eliminate and obviate such a situation and prevent the formationr of a gas lock.

It is another objectof the present invention'to provide a structure whereby, upon the'downward movement of thetraveling valve a pre-determined distance, a liquid will be permitted to flow into the chamber between the traveling valve and the standing valve so as to force the gas out of the gas filled pump chamber.

It is another object of the present invention to provide, in a pumping mechanism having a Apump chamber associated with a reciprocating part a member telescoping with the reciprocating part and vso arranged and constructed that upon a pre-determined positioning of the reciprocating part and the telescoping part, 'liquid-may be permitted to flow from the exterior -of these parts into the pump chamber.

It is another object of the present invention to provide in a pump structure of this type a means for eliminating or preventing the accumulation of a compressible uid in the pump chamber.

`Another object vof the invention is the provision in a pumping mechanism of this type, of meanswhereby a'compressible uid entering the pump chamber may be displaced with a liquid.

In some types of oil wells, the well is placed under a vacuum for a period of time in order to draw the oil from surroundingrterritory into the basin of the well. In such vcases when the pump becomes drained of all uid the standing valve and. traveling 'valve lare locked in closed positions, the traveling valve being held in closed position by the fluid above, and the standing valve being held in closed position by a vacuum. It is an'object of the;present invention to `provide a pumping mechanism so constructed and arranged that when operated to apredetermined position such a vacuum will be eliminated.

It is another object of the present invention to provide a pump structure, that, regardless of the pump space, will function efficiently and produce maximumvolume `of flow.

It is an object of the present invention to provide a pu'mp structure having a reciprocating member and a member telescoping therewith and adapted for traveling in unison therewith and so constructed and arranged that saidmember will be hydraulically balanced when immersed *Y in liquid. y y y l Another object of the invention is the pro-- vision of a pumping mechanism having a reciprm eating part and a part telescoping therewith and movable in unisonfth'erewith so arranged and constructed as to prevent said members becoming hydraulically locked inl fixed relationv when immersed in the liquid to be pumped.

Another'object of the present invention is the provision of a pump structurev so arranged, that it'will vlend. itself to vuse with liners or without liners placed inside' the working barrel thus making it-possible to regulate the pump volume of flow, and therefore the overhead load, to the capacity range of the pump operating machinery.

' Other objects will appear hereinafter.

It is recognized that various modifications or changes may be made in the detail of structure illustrated without departing from the spirit of the invention and it is intended that such variav tions and modifications shall be embraced within the vscope of the claims forming a part hereof.

Forming a part of this specification are drawings in which,

Fig. 1 is a fragmentary, longitudinal, sectional view of the invention.

Fig. 2 is a fragmentary, central, longitudinal sectional view of the invention with parts broken away and illustrating a continuance of the structure shown. in 1` with intermediate parts removed.4

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a sectional View taken on line 4-4 of Fig. 1. i

Fig. 5 is a view similar to Fig. l showing. the pump in its reverse position of movement..

Fig. 6 is a view similar to Fig. 2 showing the pump in its reverse position of movement.

In the structure illustrated in Fig. 1 and Fig. 2, I have indicated an anchor shoe 35, having an inclined seat 36 formed thereon against which may seat, in sealing relation, the corneal head 31 carried on the lower end of the pull tube 38. The upper end of this pull tube 38 carries a litting 39 which has bore 4l formed therethrough in alignment with the bore. 4,2. formed in the plunger 4U which is threaded' at.r its lower end to the upper end of the iitting 39 and at its upper end to the valve cage 43. The upper end of the plunger 40 serves to press the Valve-seat forming ring 44 into position on and secure it in position on the valve cage 43. A ball valve 45 is po- Fig. 7 is a sectional view taken on li'ne 1--1- of Fig. 5. y

Fig. 8 is a sectional view taken on line 8-8 OfFig. 5.

Fig. 9 is a longitudinal; central', sectional, fragmentary view of' asli'ghtly modified form of' the invention.

Fig; 10 is a central, longitudinal', sectional View showing a continuance off the'v structurev illustrated in Fig. Sl'withintermediateAv partsI removed and with-partsbroken a-Wayi Fig. 11 is a sectionalview taken on line |`IH of Fig. 9*. f

Fig. 12 is a sectionalview taken on ll'ne IZ-I2 of Fig; 9.

Fig. 13 i'sv a longitudinal, cent'ral, fragmentary sectional View' illustrating a modified form of structure.

Fig. 14` is a sectional View taken on line I4--I4 ofFig. 13.

Fig; 15n is asectional viewf taken on line I5--l`5 of Fig; 13. f

Fig. 16 is asec'tional view taken on line lB--IB ofFig. 13'.

Fig. 17 is a sectional view taken on line IT--ll of Fig. 13`.

Fig.A 18 is a longitudinal, central, fragmentary sectional view of a further modified" form of ,of Fig. 18.,

Fig. 22 is al sectional view taken. on line 22-22 ofLFig. 18.V

Fig. 23 isa sectional-view taken online 23-23 of Fig. 18.

Fig. 24 isa sectional View taken onL line 24-24 of Fig. 19.

Fig.. 25.vv is. a fragmentary, central, longitudinal, sectional view of a.- further modification.

In thev structure illustrated in. Fig... l.l and Fig. 22,Y I. have indici-used v the pump and. its. working partsin theposition which. they. would. assume when the upwardstroke isy being made. In Fig. 5 and Fig. 6, Il have illustratedthesame pump structure with. the working. parts4 the. positionswhichv they would'.v assume whenmaking the downward stroke and when. gashas. been encountered. Ifv gas hadnot.beenencountered, the ball valve 64 in Fig..5.would. be in elevated position, permitting the liquidto. flow. through the opening in seat63.

"flowof' liquid' through the plunger.

sitioned inthe cage43 and adapted, when resting ori-the seat44ato serve as a closure for the upper end of the plunger 40 and prevent downward It will be noted. that this typeof structure embodies a stationary plunger. Some pumps have a moveable plunger and a stationary barrel. The traveling valve used in thes'efpumps is carried by the moveable part whether it is the pump barrel or the plunger.v In the structure' illustrated the ball valve- 45 may be termed the standingv valve.

The pump plunger 40i snugly engages as a slidable tin. the pump barrel 46"' which carries the engagement nipple 41'at' itsk lower end and which is connected at itsiupperv endl to one end of a fitting 48. Connected" to' the upper end of the fitting at its lower end is the tubular member 49V having itsupper end increased in thickness as 54', and provided with th'e inclined bearing surface or' engagement shoulder54'. Slidably'engagingas snug'iit'in the tubular member 49, is a lifting tube 511Y having the upperl end reduced in outside diameter to provide the constricted portion Y ortube 52A and thus form the engagement shoulder 53 adapted for.' engaging theinelined bearing or engagement surface' 54'. Thek bore through the tubing 49 is reduced in diameter by a thickened portion 54"t`o provide the constricte'd' bore 55 in which the reduced portion 52 of themember 50 slidably engages in ai snug fit.

The inner surface of the portion 54' is cut away, intermediate'its ends, to provide the circumferential? inner channel' 51 whichY extends around the portion 52 and which. communicates through the openings 58* with the interior of the tubing 341, and which is: adaptedr to communicate with the openings'59'formed in the reduced tubular portion 521 They upper end ofthe tubular' portion 52 is provided. with a lockk nut 6D andA threaded into one endr of the-fitting 62 and serves to press against and retain in positionthe; annular seat-forming member 63 which serves as a seatfor the ball valve 64`. This valveis the traveling valve. Prothe downward stroke, the` valve 45 would move into closed positionand the valve 64 would open permitting the.. pump chamber to be cleared of 'garded be made of extraordinary length the difference pumpbarrelwould remain stationary until the lock -nut 60 contacts 'the member 54 at its upper end whereupon the` pump barrel and the ,member 65 wouldmove in unison with each other,

the member`52 and the member 50 telescoping I'with the pumpvbarrel49 until the lock nut 69 engages the upperv end of the portion 54. .On the Aupward movement these parts 49 and 50 would Amove relative to eachother until the faces 53 and 54 engage. f For an eiicient operation of ever, it is necessary that the pump barrel be hydraulically balanced. 'Experience has shown that the difference in'theliquid pressure'at opposite ends of the pump barrel due to the length of the pump barrel is negligible and may be disre- If,fof course, the pump barrel should in pressure would have to be taken into account; If the pressure on lthe upper end of the pump `barrel 49 should be greater than the pressure on the lower end ofthe pump barre] the tendency would be to maintain the member 59 in the position shown lin Fig. 1, so that the engaging faces must be maintained within certain limits due to a desire to reduce the Weight as much as pos- @sible and obtain the desired bore. An examina- 'tion of Fig.V 1 .will indicatethat the lower end Sof the pump barrel 49 is of lessthickness than the upper end or thickened portion 54'. 'I'his diierence in thickness is accounted for by the formation of the shoulder and bearing face 54 and in this manner a true balance of the pump barrel 49 is obtained. l

In operating, as the member 52 moves downwardly so as to telescope with the-pumplbarrel 49, the openingsA 59 will move into registration with the openings 58. By having the inner surface of.the member 54f'cut away as at 5'! to provide the internal channel, the openings 59`will` be in communication with theopenings 58 when v'registering with the channel 51,l regardless of these parts, howf .The liquid `entering the pump chamber through the openings .58 willthus establish a liquid pressure inthe pump chamber equal to the liquid pressure in the tubing 34. As the pump barrel is moved downwardly the liquid therein` will be .subjected to additional pressure suflicient to lift the ball valve 64 off its seat and the liquid in the pump chamber will'b'e permitted to escape through the valve seat 63 and through the openings 58 and 59, this liquid carrying with it anyy gas which may have accumulated in the pump.

barrel. The same action would effect a breaking of avacuum which may have been established in the pump chamber through subjecting the well relative rotation of the member 52 and the pump barrel 49. lWhen the downward stroke is being made, that is, when the lock nut` 60 isin engage'- ment with the end of the portion 54', the openings 59 will be in registration with the channel 51 thus establishing communication of the interior of the pump'chamber or pump barrel 46 with the interior of the tubing 34. This will permit the liquid which is standing in the tubing 34l the forming of la vacuum in the chamber 46. It is, of course, obviousV that the chamber 66 is sealed at itsop'posite ends by ther engagement of the member with .the inner surface of the member 49 in sealing relation and byengagement of lthe member 50 in sealing relation with the inner surface of the member 54.

to vacuum pull over a period of time.

The engagement faces of the members 54 and B0 should previously be ground rough and in Fig. 9, I have indicated the engaging face of member 6I', which functions as a stop member in the manner of the member 60, as provided with a groove. The purpose of having these engaging faces roughene'd is to prevent the parts becoming locked by virtue of the pressure which may `surround them,-whether it is air or liquid. In this way when the upward stroke begins from the position'shown in Fig. 3 the parts '60 and 54' are readily disengaged. l i

In this manner I have provided a pump which is hydraulically balanced, and in which the formation of 'a gas lock or vacuum is prevented.

In Fig. 9 and Fig. 10, I have indicated a structure corresponding largely to theA structure illustrated in Fig. 1 and Fig. 2. Corresponding parts are designatedin Fig. 9 and Fig. 10 andthe sections taken thereon with reference numerals corresponding to the similar parts in the structure illustrated in Fig. 1 and Fig. 2, the corresponding reference numerals in Fig. 9 and Fig. 10 being indicated as prime numbers.

The member 6| .f which corresponds to the member 6| of Fig. 1 serves as a contact member, the lock nut being eliminated. This member 6| is provided on its face with the groove 60 for engaging the upper end of the member 54"' f' which corresponds to the member 54 of Fig. 1.

Formed preferably integral with the member l the ring 68 as at 69 to retain this ring in position.

The member 41 corresponds to the member 41 of Fig. 2. This member threadsinto one end of a fitting 19. The opposite end ofvthis fitting 'luthreads intothe lower end of the pump barrel 46'. Thus in the structure illustrated in Fig. 1.0 there is a departure from the structure illustrated in Fig. 2, accomplished by using the ltting 19. is resorted to in orderthat the liner sections 1I may be easily and quickly inserted in position. These liner sections abut against one end of the fitting 48 and are engaged by oneend of the tting 19. lThe purpose of using the liners is to reduce the sucker rod load f and provide a finer barrel finish. This reduction in the load is accomplished by reducing the volume capacity of the pump. It will be noted that the' openings 56 shown in Fig. 1 are notpresent in the structure shown in Fig. 9. Otherwise the structure illustrated in Fig. 9 and Fig. 10 is similar to the structure illustrated in Fig. 1 and ,provided with .axial openings |07..

.21 the vintious`r features and functions andresults of' the structure illustrated in Fig. V1 and Fig. v2 are present .in thestructure illustrated Ain Fig. 9 and Fig. lO.

In. Fig'. .13,1 havev .illustrated a fragment of a pump which thev structure is slightly modified trom .that already described. The valve cage 'l2 :ist provided with e, threaded stem 7'3A for `atta-ch- -ment to the sucker' rod. Positioned in the valve cage H2' is theI .ball valve '|4- tting on the seatforming .ring |15 which is held in .position by one enli. ci 'the ii'tting |6'. Threaded into the opposite yend vofftluz- -fitting 'l5 is the pipe Tl carrying the lo'ck nut 18. lSilidably mounted on the pipe 11 is the barrel 8T carrying the top portion 19. This Ibarrel .ann this top portion 1B will be vtree to ro- .ta'te Aon the pipe l'l or may .be secured against `rotation while at the `same time-permitting longitudinal relative movement. Formed in the tube 3 9 arey openings 80whi'ch correspond to the openings r59^of Fig. 1. The lower endo-f the tube 11 is formed vinto 'a piston, cutaway-as at 83 to provide aciearance or :channel-communicating with the `vent open-ings 86. This .portion is alsoI provided with-grooves :in which may bel positioned pack- 'o1-:sealing rings 85. This structure is illustrated and may be resorted to when it 'is desired to compensate for mis-.alignment `of the parts 19 and 8f? whenv threaded together. When this structure is resorted to, a iinely machined` t between `engaging surfaces .oi the member 11 and the pumpparrel -BFI is not required as the expanding packing r.or 'sealing 'rings 8-5v would ycompensate `for .any roughness 'in machining which might be present. A

InFig. 18 and Fig.. i9, 15h-ave illustrateda modification `of thei-nventi'on :and in these views I have illustrated an anchor 'shoe '88 having an inclined seating surface 89 against whichengages the conical surface y9J oi the lhead 90 which is connected at its upper :end to the valve cage 93 vhaving the inwardly projecting shoulder`9l `against which t'h'e seat-forming ring wisheld .by the `end of the lhead 90; Alball valve 496 is lpositioned in the cage 93. .Apin 98 .is extended diametrically through the cage 93. A'nipple 9J on the upper end of cage 93 threads into one end 'of ya `coupling 99, the

4other end of which threads into the lower end of the pump barrel |.0|. Thus `the `pump barrel is mounted stationary. Liner sections |02 are .mounted within the barrel Threaded into the upper end of the barrel |0.| yis one end of a -tting Iiiwhich-engages one of the end sections `of the .liner |02, the other .end section engaging an yend of vthe coupling 99. Positioned in the iitting |03A .is a guide .ringl04 which v.projects through the .head |05 .threaded into the upper end of the fitting |03. This head |05 is provided with lateral openings |05 and the ring .|04 is Slidably projected through the head |05 .and .the guide ring L04 is a, rod |08 which connects to the upper end of valve cage |09 .in which is positioned the ball valve l l0 adapted to rest upon theseat-form- .ing ring lli. This-ring .is engaged .by one end of' the connector ||.2 which is threaded into the lower end of the valve cage |09 .and which also threads onto the plunger extension tube H3. A

lock nut ||4 is threaded onto the tube H3. Em-

bracing the tube I3 and slidable relatively thereto, within predetermined limits, and slidable in unison therewith is a sleeve |5. Laterally direct- .ed Openings I'B 'are formed in the tube ||3 and adapted., when the locknut n| |4 engages the Iupper end nof the sleeve ||5, .for registering with the openings 1H .formed in the sleeve H15 and for communicating. with the peripheral channel |1|8 extending around the tube I |.3. Anaxially directed passage ||9 communicates at one endA with the groove or channel ||f8 and at its opposite end with the groove or channel H8 shown in Fig. L9. The tube I3 may be termed the plunger tube inasmuch as it is formedy at its lower end with the piston-like plunger |20 having the peripheral grooves |2| formed therein for receiving sealing or packing rings. The meeting faces of members H4 and ||5 are finished rough so that an atmospheric or hydraulic. locking of these faces together is' prevented.

In= operation, theV rod |08, tofwhich is connected thesucker line, is Ireciprocated so as toreciprocate the plunger in the stationary pump barrel |0| ispositioned .in spaced relation to the tubing34" to whichtheanchor shoe 88 is connected. As vthe rod |08. moves Vdownwardly the lock nut IM, through engagement with the upper end of rthe sleeve l| I5, will force this `sleeve to travel in unison with the tube ||3 afterthe openings ||6 .have been brought intoI registration with the ychannel or groove H8. When this registration is eilfected the vgas lock or vacuum, herein previously referred to, `will be eliminated and the sleeve l5 will be in hydraulic balance, the liquid being. permitted access tothe lower end of the sleeve ||5 through the passage I9.. As the plunger is .forced 'downwardly the liquid will be forced upwardly through the bore of the plunger and through the plungertube -I i3 forcing the valve |-I'0- ofi' its seat, the liquid traveling upwardly and .having access to the `well tubing 34. through the opening |06...` In this .movement the ball valve 9B will be resting upon its seat. In the reverse movement the ball 96- will be lifted from its seat. The :sleeve ||5-and the tube ||3 will be moved tothe relative positions shown in Fig. 18, and the ball valve I0 will rest upon its seat.

Itis yobvious that .a prevention. of a .gas lock a well of vthis type is accomplished in substantially the same manner as previously Vdescribed for .the other forms. Anyone skilled in the art will understand that the pump barrel may be anchored either above or below.

In Fig. 25., I have indicated a structure in which the ball valve 14, illustrated inFig. 13, is eliminated, andthe upper end'of the iitting T9 corresponding to the tting :'IE of Fig. 13 is closed by a `disc |60 mounted within the cage 16| from which .extends the threaded ynipple |82 rfor attachment -to the sucker rod. In such a-structure the liquid .pumped would have access -to the lwell tubing through the openings 81| illustrated in Fig. 13. Experienceha's shown that -this structure is operi ative --so that the traveling valve may thus be veliminated when desired. This structure is particularly adaptedwhere the lpumping mechanism -is operated .atslow speed. It isobviousthat in all :of the structures illustrated, the 4parts may -be easily and quickly .assembled .and disassembled. Another feature which is :obvious is the kcompactness and lightness of the device. The structures .also are such ,as to lend themselvesto a production method of manufacture. i l

In operation the `pump would ordinarily be ,immersed in liquid. This is true whether. the pump ordinarily is positioned immersed in the liquid or is .positioned well above the liquid to be pumped.

lWhen positioned Well above -the liquid to be pumped, the .liquid will be discharged from the I .upper cndof the pump and A graduallyufill the s Well 'tubing toa .level whichisabove ,the pump. Qrdinarily. a gast lock.. would not` develop in a pump until the column of liquidabove the pump exerted pressure on the traveling valve suicient to c ounter-balance the compression of the gas within the .pump chamber. y

,It WillbenOted that1the breaking of the gas lockV brieiiy v,consists in bleeding a liquid from aroundthe pump into the interior or into the pump chamber between thetraveling Valve and standing valvewhich may be termed the end valves of the pump., .-'Ihis bleeding is accomplished on the out-putstroke of the pump and the bleeding ports are v closed on Vthe in-take stroke ofthe pump.

y WhatIclaim asnewis: i v1.,-In a pump mechanism. ofthe class n,described, adapted for operation while immersed in liquid, a -pump barrel having a liquid receiving chamber therein;` avtubular plunger, said plunger land said barrel being associated in telefA` dinally oil each other; `a valve mechanism at each end of said chamber'foropening and closeA ing the sameJ said valvesgbeing arranged sorthat one valve is open When the other is closed and vice versa; and means lfor ,bleeding a liquid .into said chamber through saidplunger between said valve mechanisms during movement of the barrel-in one direction and preventing bleeding duringm'ovementof the barrelin the opposite direction.

3.1n a pump mechanism of the class described, adapted for operation While immersed in liquid, a pump barrel; a tubular plunger in telescoping relation with said barrel; a valve in said tubular plunger; a tubular extension on said barrel; lateral openings in said extension; a tubular member telescoping saidbarrel lextension; lateral openings in `said last-named tubular member and'communicable with the lateral openings in said extension; and a valve at the end of said last-named tubular member, said valve being adapted to remain open When said rst-namedvalve is closed and vice versa.

4. A pumping mechanism embodying a pair of telescoping reciprocable tubular parts; one of said parts constituting a pump barrel and the other constituting a plunger; an oil conduit in said parts; valve means for closing the ends of said tubular parts; a tubular extension on one of said tubular parts; a tubular member telescoping said tubular extension and reciprocable with respect thereto; a valve for closing one end of said last-named tubular member; and lateral openings in said last-named tubular member and named member, saidL tubular members 'being arrangedfin telescopic relation .at one of their ends,

and adapted vfor. slidable longitudinal ,relative` movement, the `interior vof 4one tubular` member communicating with the interior of the. other;

means for bleeding liquid into'y the :interior oi' said members upon telescopic movement of said members in one directionto a predetermined position; and means v'for limiting the relative longitudinal movement of said members.

Q6. In a pump mechanism of the class described, adaptedfor operation while immersed in liquid, a pair of .tubular sections, said sections being arranged at one of their ends in telescopic relation, slidable longitudinally'of1-each other, one of said sections comprising a pump-barrel and the other of `said sections comprising a plunger; a pair of valves, there being a valvey at one end of veach of said' sections forclosin'g the samethe first section having lateral openings formed therethrough in communication With the liquid in which it4 is immersed; a third tubular section slidaoly engaged in said iirst section and having lateral openings formed therethroughand communicable with the opening `of the rst section,

said lateral openings being adapted for communication With the openings in said rst section upon movement of said third section to a predetermined position relative to said first section.

being'adaptedfor communication 'with the open-v ings in said first section upon movement of either section to a predetermined position relative to said other section; and means carried by one section for engaging said other section upon alignment of said openings thereby forcing said other section to travel in unison with said first section.

8. In a pump mechanism of the class described,

adapted for operation while immersed in liquid,

a pair of tubular sections, said sections being arranged at one of their ends in telescopic relation slidable longitudinally of each other; a plunger `in one section; a pair of valves,l there being a valve at one end of each said sections for closing the same, one of said sections having lateral openings formed therethroughv in communication with the liquid in which it is immersed; lateral'openings in said other section being adapted for communication with the openings in said iirst section upon movement of said second section; means carried by said second section for engaging said rst section upon alignment of said openings and thereby forcing said first section to travel in unison with said second section and means for moving said sections in unison upon movement of said first section in the opposite direction out of openingA aligning position a predetermined distance. y

9. In a pump of the class described, adapted for operation While immersed in liquid, a pair of tubular sections-arranged at one of their ends in telescopic longitudinally slidable relation, one of said sections forming a pump 'chamber vand the other of said sections forminga tubular plunger communicating with saidV chamber; valves for closing the ends of said sections; "means for anchoring one of said sectionsstationary; areciprocating mechanism; a floating connection between said `reciprocating kmechanism and the other of said sectionsalignable ports'in `said reciprocating mechanism and said oating 'connection, said floating connection being arranged for moving one of said sections in lunison with sai-d reciprocating mechanism'in either direction, subsequent to themovementlof 'said reciprocating mechanism a predetermined distance in either direction; and means for 'maintaining the-reciprocated section in hydraulic balance in the liquid in which it is immersed. y

10. In a pump structure'bf thieclass described, adapted for operation 'Whileimmers'e'd in liquid, 'a pair bfi tubular 4sections arranged at "one f` their ends in telescopic -longitudinal-1y rslidab-ie "relation, one ofsaidse'cti'ons providing a pump barrel and the other 'of 'said sections providirrga plunger; a travelin'g'va'lv'e on the upperend of' said barrel Vstructure 'for j'preventirrg return flow of liquid into said barrel; a'valveon the lowerei'id of said 'barrel structure for preventing kreturn now lf'liquid fromsaid barrelfsaid barreis'ection having, Jbetween said valves, openings for communic'atingthe interior'thereof with the liquid in which it is immersed; a third section telescoping (said Afirst sect'ivo'n "and having means formed therein for registering with the openings in said iirst'section upon'movementof said third section toa predetermined position land means for closing communicationpf the 'interior cfsaid first a'nd third sectionswith theliquidinwhch itis immersed. y j

11. `In a pump 'structref ofv the class described, adapted for Aoperation'vvhile'immersed in liquid, apair 'of tubular"sectionsarranged 'at one lof theirends in telescopic longitudinally siidable relationto provide a chamber; a-traveling valveat the upper 'end of one'of saidsections'ior preventing return ii-ow of liquid into said chamber; fa valve at the lower end of the `other section for preventing return flow of liquid l"from said cham-4 ber, 'one of 'said sections having, between said valves, openings for communicating the interior thereof with the liquid -in whichit -is immersed; one of said sections telescoping the other and longitudinally movable relatively lthereof and having openings formed therein for registering with `said cpenings'in said chamber upon movement of -said sections to 'a predetermined position; means for movi-ng 'said 'sectionsf out of said predetermined position and for closing 'communication of the interior `of sai-d chamber with the liquid in which it is immersed; and means `for maintaining said tubular member iin hydrostatic balance in said liquid and preventing vacuum lock between the said -sections and said tubular member.- 't

12. In Aa `pump structure'of the `class described, adapted for operation while immersed vin liquid, Va pair of tubular sections arranged in telescopin'g longitudinally Vsl-ida'ble relation; one of said sections providing a tubular plunger and the other of said sections providing a pump barrel; -a valve for preventing return riiow of liquidin'to 4said barrel from Aone end; Aa valve 'for preventing return flow of liquid from said barrel :at its opposite end, said barrel sections having lateral openings formed therethrough between said valves for communicating 4said barrel Awith thel-iquidin which it is immersed; a tubular member telescoping and longitudinally sl'idable insaid barrel section and having openings ladapted `for registering with the openings in `said barrel section upon movement ofsaid'sec'tion to a predetermined position relative to said tubular member; finterengaging means between said last-named member and said barrel section vfor effecting "a movement of the same in unison with each other upon the registration of said openings; andmeans for disengaging said interengaging parts.

ROBERT M. LINDGREN.

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