US1658031A - Pneumatic pump - Google Patents

Description

Feb. 7, 1925. 1,658,031',

B. S. AIKMAN PNEUMATIC PUMP Filed Deo. 3l. 1923 4 Sheets-Sheet l ff 2 3. f2 l// J0 'I 2@ ,l Ui u", 24 III` 111 J? 30 I e?? l! (Hmmm/] l m .l I' f@ 6. ff y x l l e woe/movi' Feb.7,1928. l 1558931 B. S. AIKMAN PN EUMAT I G PUMP Filed Dec. s1. 1923 sheets-sheet? Feb. 7, 1928. 1,658,031

. B, s. AIKMAN PNEUMATICI PUMP Filed Dec. 31, 1.925 4 sheets-sheet 5 B. S. AIKMAN Feb. '7; 1928.

PNEUMATIC PUMP Filed Dec.

3l. 1923 4 Sheets-Sheet 4 Patented Fen 7, lgi.

uuirsnsrarss Param omas.,

BURTON S. AIKMAN, .0F MJLWA'UKEE, WISCONSIN, ASSCGNOR TO NATIONAL BRAKE AND ELECTRIC COMPANY, OF MELWAUKEE, WISCQNSN, A CRPGRATION OF WIS- CONSIN.

PNEUMATIG PUMP.

application inea December 31, 1923. seran no. 683,533.

My invention relates to pneumaticpumps of the class disclosed in my prior latentV No. 1,423,291, granted July "lh i922. While the inventioniis particularly suitable for faucet control and is'particularly adapted to a single cylinder pump it is to be understood that the invention is not limited to such use or such particular embodiment.

As explained in said prior patenh one of the fundamental requirements of a single cylinder faucet control pump is that the pump be able to till rapidly so that the intermission between discharge `strokes shall be as short as possible in order to avoid storing of any substantial. anioi'int of water in the steady Yflow chamber which is used on the discharge line.

this exhaust port is obstructed by a `poppet 'Valve seating with pressifire so as to remain tight. A large valve 1s essential for rapid evacuation of air pressure but this entails the requirement hof relatively great power to open such a poppet valve llllhile this arrangement is highly advantageous ltind that it has one structural difficulty. namely that if a yielding` face be employed on the valve for insuring` tightness of the valve the ullino of the valve off against internal pres. p m i A opening of the valve does not tend to dis-` place or stress the yieldingace. To hold such valve closedl employ a normally unbalanced differential pressure motor. Even if a yielding; face be provided on the valve, and it is to be understood that this is not absolutely essential to the practice of the invention, very small clearance of the exhaust valve is required for suitable operation because t-he stresses 'upon the valve face are such as to tend to clear the valve port when the valve starts to open.

It will bennderstood that in the prior construction where the yielding' face of the exhaust valve tended to tear loose as the Y In said priorpatent av relatively large exhaust port is provided and control.

valveisopened7 suchvalve must be moved a considerable distance away from the port y to insure clearance and continued opening; of such port. In the valve of my present invention only a small travel of the valve is necessary to secure complete and adequate openingv of the same.

rlhis opening` of the exhaust valve l secure by a low level control which changes the pressure condition on the differential pressure motor to a sufficient degree to permit the exhaust valve to move to open position.

At'the same time I employ the admission valve asa snap actuating device to impart a quick and positiveV motion to the exhaust valve .in hoth its opening` and its closing motion. I `believe that l am the first to use aslightly openpoppet valve as snap acting means for closing another control valve or for opening1 the same.

The admission valve is made preferably with a metal fac-e so that its opening` as it moves away from its seat against pressure may be relatively small to secure this snap action which l. have mentioned. No dilitculty is encountered even if the admission valve leaks slightly since such leakage can occur only during` the brief periods that the exhaust valve is open. The exhaust valve, however, must be tight because .it holds the pneumatic pressure while the pump stands under pressure as is required by faucet Furthermore I wish to point out that according to my present invention the mode of operation of the admission and exhaust valves and their control or operatintfgmotor is substantially different from and an improvement upon the device shown in my prior patent.

Incidently `there are a number of other features and improvements Which will be apparent fromA the following` specification and the claims.

In order to acquaint those skilled in the art with the manner of constructing and op erating` a device embodying my invention l shall now describe. in connection with the accompanying drawings a specific embodi- CIL through the head and upper part of the pump valve of a device embodying my in vention;

Fig. 2 is a` vertical longitudinal section of the lower and foot portion of the same;

Fig. 3 is a plan view of the pump showin in Figures 1 and 2;

Fig. t is a section taken through the head on the line 1-#1 of Fig. 3;

Fig. 5 is a similar section through the head taken on the line 5-5 of Fig.. 3;

Fig. 6 is a horizontal section through the head taken on the line 6-6 of Fig. 1;

Fig. 7 is a section taken through the head on the line 7-7 of Fig. 3;

Fig. 8, is a horizontal cross section taken on the line 8-8 of Fig. 1 showing the high level `control valve;

Fig. 9 is a horizontal cross section taken on the line 9-9 of Fig. 2 showing the low level control valve in plan view;

Fig. 10 is a fragmentary vertical section of the valve box taken on the line 10-10 of Fig. 9;

Fig. 11 is a horizontaltransverse section of the valve box taken on the line 11-11 of Fig. 2;

Fig. 12 is a similar view takenon the line 12-12 of Fig. 2 showing the connection for low level control of the. valve operating motor 5. and Y Fig. 13 is an elevational view of the main valves and the stem therefor.

The pump which I have illustrated co1nprises primarily the head member 1 which is preferably made ot a. brass or bronze casting, the foot member 2 which is preferably of like construction7 and the barrel member 3. which is preferably a piece of seamless'tubing.` The head casting 1 is suitably cored and machined to provide the various sockets, passageways and chambers hereinafter more specifically described. The

foot casting 2 Vis similarly cored. and machined to provide an inlet passage and valve seat for the admission. of Water into the pumping chamber 4, which isl the space defined between the head and -toot members 1 and 2 and enclosed by the barrel Suitable ring gasket-s 5 and 6 are engaged by the Lipper and. lower ends respectively of the tube or sleeve 3 to form a fluid tight lioint. The head and foot casting members 1 and 2 are held upon the ends oiV the tube or sleeve 3 by a central water discharge pipe 7 which at its upper end is threaded' into a suitable pipe socket formed in the lower face of the head casting 1. This water discharge pipe communicates:y at its upper end with a water discharge passage-way 9 as will be more clear from Figures 1. l. and 6 and it terminates in a pipe socket- 9 at the top side. of the head casting 1 into which pipe socket the water discharge pipe from the pump is threaded.

rlhe lower end of the water discharge pipe 7 is threaded int-o a pipe socket termed in the upper side ot a valve box 10 shown more clearly in Figures 2, 10 and 1l. rlhis valve box casting has a threaded socket 11 at its lower end into which there is threaded the stud or pin 12. rlhis stud or pin 12 passes down through a central axial bore in the Jfoot member 2 and extends therethrough to receive the cap nut l?) which draws up the head and toot casting members upon the ends of sleeve or barrel men'iber A suitable screen which may be made o' perforated sheet metal or the like is held in place under the edge of thc nut l?) and covers the intake passageways l5 which are formed in the toot casting. These inlet pas sageways 15 terminale in the inlet check valve port 1G which port is annular and has concentric seats covered by the ring cheek valve 17. This ring check valve 17 may be made ol hard rubber or a suitable molded composition such as bakelite. lt is guided upon a tubular guidiiig member' 1S, the lower end uit which is a continuous sleeve threaded into a socket 19 and the upper end ot which consists oli three arms having suitable lugs 2O ior limiting the upward movement or li'lt oi said inlet check valve 1T.

The head casting l contains two pipe sockets 21 and 22 iu addition to the pipe socket 9. rlhe socket 21 communicates with au inlet passageway 23 which leads into a valve pocket 2i and then through a valve port 25into a pecl-:et 26 which pocket commu-- nicates by way oi a passageway 2T with the interior of the pumping chamber Thu.` said pipe socket 21 is adapted to be connected by suitable pipe to a source oit pressure fluid such as a tank of compressed air. The socket 22 is adapted to be connected to an exhaust pipe leading to atmosphere. This socket 22 connects by way oit a short passagewav 2h into a valve pocket 29 and through a valve port to the pocket 2G which communicates` also by way of passageway 2T with the interior of the pumping chamber Ai. )in adsission valve 30 and an exhaust valve 53' are mounted upon a common stem 32 with a spacingl sleeve 33 between them. This spacing sleeve bears at one end against the `guiding portion ot the admission valve 30 and at the opposite end it hears against the central hub portieri 35 oi the exhaust valve 3l and it has an extending flange 36 which partially overhangs the yielding valve tace 37. The admission valve -O his closely on the reduced portion ot the stem and hears against a shoulder 5:38. El ut 39 is threaded upon the end of the stem 32 so as to draw the exhaustv valve against the sleeve 33 and this in turn against the adjacent end oi the admission valve 3() and the admission 'valve 3l) against the shoulder 85 to iorm a rigid unitary struc-- Sl (l ture.` The guide portion Si the admission valve 80 has suitable wings or lands fi() which are guided in the cylindrical passageway tormedbetweeu the valve pocket 2l and the pocket or chamber 26. ',lhe sleeve 33 similarly has wings or lands Lil which guide the same in the cylindrical concentric bore of the exhaust port 4t2. lt will be observed that the travel oit this compourul valve structure is short and in the structure which l have illustrated one tl .irty second out an inch travel is suliicient to secure completo opening and closing ot the valves 30 and Bl alternately. Since compressed air is admitted upon the back of the admission valvel() it will be appreciated that considerable torce .is required to pull it trom its seat and also thatconsiderable iorce will be required to hold the exhaust valve 3l closed against its scat. l have provided therefore a differential pressure moy ing ch amber.

tor i3 which is adapted to operate the compound valve structure and which motor 43 is controlled by means responsive to high and to low level in the pumping ehaber a for` shitting the valve to admision position when the liquid has substantially hlled the pumping chamber and tor shitting the valve `structure to the exhaust position when the pumping chauil'ier has been substantially emptied. This dihwerential pressure motor lil comprises a cylinder or chamber la termed i in the head l, one side oit said chamber being closed by the guide plate Zlythis guide plate being held in .a suitable seat by means otl three conical head screws Liti as willvbe more apparent from Figures l and 7. The guide p late a5 has a central boss if? which isdrilled to provide aloose orso called sloppy tit with the stem 32. `This loose lit ot the stem 39., with the hole through the boss al' of the guide plate 45, provides a leakage passageway for live air iii-om the live air admission port 23 in advance et the admission valve 30 and its seat 25 to the interior oi the pumprllhis leakage passageway eX- tends along the stein 82, through the diaphragm chamber or pocket dei. down the `l'iassageway (it), pocket, (Si. past the valve ttl,

and througl'i the port 53 into the interior ot the pumping chamber. Stoppage ot the inner end ot said leakage passageway results in an acc'lnnulation oi pressure in said passage or chamber all, which actuates the motor member .a9 to admit .live air to the pumping chamber. The other side olf the chamber la is closed by a tleitible diaphragm t9 which diaphragm is clamped Vabout its edges by means oit the cap or head 50, this cap or head being clamped on by sii: machine screws 5l as indicated in lrtigure 3. rlhe diaphragm i9 is apertured atits center and the inner edges are clamped between flanges and 530i the diaphragm support or plate 5a and nut 55 respectively. This diaphragm `support or plate 5a has a central boss which is threaded ot' operations may be established.

to receive said nut 55. This boss is threaded upon a reduced threaded portion 56 of the stem 3.a. The outer reduced end 57 of the stem 32 passes through a guiding opening in a boss formed in the cap 50, the lit ot said reduced end 57 in the guiding opening being loose or what is known as a sloppy tit. A biasing' spring is mounted in the hollow stud formed on plate member t and is supported upon the boss termed on. the cap member 50. The function ot this biasing spring is to hold the compound valve structure in the position shown in Fig. l when there is no pressure upon the pump so that an orderly sequence Since the biasing spring holds the admission valve 3() normally closed and the exhaust valve 31 normally open when there is no pressure upon the pump, the pump will lill with water as soon as it is submerged and it will at once be ready for operation as soon as the pressure is applied.

rlhe chamber all which is formed on the back side of the diaphragm 49 communicates at all times with the admission passageway 25 through the restriction formed by the loose litot the stem 32 in the guiding plate a5. Vrlhe connection between the valve pooltet 21.1: and said chamber aetis restricted but it is sufficient for the purpose of operating the motor as will be yapparent later. This chant ber sie has an exhaust opening comprising a passageway 60 (see Figs. (i and 7) prefer ably 'formed by drilling through a casting, which terminates in a valve pocket 6l which pocket is closed by a valve plate and bracket .member G2 clamped to the lower surface ot the head member l. A valve port 63 is i'ormed through said plate member 62 and a ball check valve tiet is adapted 'to obstruct port 63. A swinging lever member 65 is pivoted to the arms or brackets 66 which are formed on said plate member 62 and this lever member G5 has a pin 67 which enters the port (33 and holds the ball check valve (ist oit its seat. The lever ('35 is made rela tively heavy so that its outer tree end 68 `overbalances the short end which bears the pin G7 to insure automatic opening oit said valve till. rlChe outer tree end 68 has a boss or stud GS which is adapted to engage the under side of the head casting l when the lever is raised to its uppermost posit-ion. i It will be noted that the lever 65 surrounds the water'discharge pipe 7 and the outer end 68 is in position to be engaged by the traveling iloat` member 70 which is guided upon said water discharge pipe '7.

The upper end of said iioat 70 bears a rubber butler n'ieinber 7l adapted to engage said outer end (itl ot the lever G5 when water rises in the pumping chamber so that the valve (til: .may drop to its seat by gravity. The rubber butler 7l serves the dual purpose ot preventing hammering against the lever l if llt)

accumulate in the chamber lll.

in thermeta-l of the head member l.

wel:

68 When Water ills the .pumping chamber and .also it serres as loading :for 'he :float i0 to give it sutlieient Weight to operate .the lou7 level control valve as *ill be described rlater.

Assuming that the Valve structure and diaphragm and other parts are in the position @shown in `Fig. l and compressed air is supplied through the passageway 33 the leakage ot compressed air past the bearing et? onthe stem 32 enters the chamber le but exhausts therefrom into the top oi' `the pump- .chamber i because the valve 16e'- is held away from its seat and pressure cannot Non' `as soon as the float .70 rises .and permits the valve (il `to seat pressure builds up in said chamber ta until .the total pressure upon the diaphragm is greater than the pressure upon the :admission valve 30 whereupon the entire structure is snapped to the left, as viewed in Fig. l, opening the admission valve and closing t-he exhaust Valve. Liveair is thereupon admitted to kthe pumping chamber l and builds .up a pressure therein rery rapidly, this pressure acting upon the valr 3l tend* ing t open the same but is ineffectual because of the pressure of lire air upon the right-hand side of the diaphragm 49. Tater is thereupon Vexpelled from the pumping chamber as will be explained later, and the-level of water in. the pumping chamber t drops with the .result that the iloat TO no `longer supports the outer end oi' the lever .and check valve Gl is opened. However5V it Will be noted that the pressure from the pumping` chamber d then freely communicates with the diaphragm chamber elfi on the right-hand side of the diaphragm Li9 so that V,the same pressure which tends to push the exhaust valve oil the seat also acts on thc diaphragm 49 tending to `hold .the exhaust valve upon its seat. The proportioning oit' the parts, and particularly of the areas inA volved7 is such that the area of the diaphragm 19 is substantially in excess oit the area of the exhaust valve 31 with the result that there is a larger "force tending to hold the exhaust Valve closed than to open it. The net result is that the exhaust valve remains closed.

The diaphragm chamber 58 formed on the left-hand rside .of diaphragm 49 as viewed in Figure l communicates With the outside pressure, Which is usually7 the pressure of submersion, through the loose fit between `the reduced stem portion 5T and the guiding boss in which it lies. Normally, therefore, the pressure prevailing in chamber 58 is la `relatively low hydrostatic pressure not Imuch more than a feu' pounds above atmospheric pressure. This diaphragm chamber communicates by Way oit a passagevay 78 formed in the lower part ot' the cap member 5,0 and an extension thereof 73 formed A short 'inseam 4threaded into a socket lormed in the metal of the head member l and which :it its lower end is threaded into a nur" To in the lower part ot the ralre box. This pipe T5 which is preferably ay length of .small dialneter copper tubing, extends substantially axially ot the water discharge pipe i' dou'n through said Valve box lil pas( the water discharge check valve TT and iuio the lower part of said boss l0 where a pocket TT is formed :tor receirinpA the nut To. The threaded stud 12 threads' into the lower end ot' said pocket T7 closing oil the saune. The nut TG is a cap nut haring a series ot pasw sageways 78 theretluough, said passugeirays permitting `communieatiou between the pipe and the interior olf the pocket 7T. The pocket TT in turn communicates througih a horizontal passage.ruy 7S) and a vertical passageway SO with a ralrc port Sl 'formed iu the removable seat Si). This seat 82 is pressed into a countcrbore formed in the end oit passageway 80. This valve port Si is controlled by a suitable ralre lforiued o l a yielding disc S3 held by a clampingl uut Hl in the short end 85 of the ralre oilieraliua` lerer This lever is piroted on lugs Si forming a part of the structure olf the vulve l0. The central part oit the lerer 8G is hollowed out to surrouml the water discharge pipe 7 and the outer end 83 olf this lever is adapted to engage the lower phuc member 89 of the float member 70. il .suitable Wire spring in the shape et u hair pin is shown at 90. This spring is :fastened by shouldered screu's 9i and 92 io the lever hl and to the body oi the valrc box l0 res} ectively so as to hold the ralre 83 over the port 8l except when the Weight oi the lloat 70 is brought upon the outer end oit the lerer 86. The Water discharge rulre i is :formed oi a metal back and a yielding tare portion clamped upon a stem Slt. the rear end of which is guided in a` hollouY lug fla providing a. guiding pocket. il uur no threaded upon a reduced portion oit said stem 9iclamps the Valve TT against u shoulder on said stem Ell. The forward or outer end 9T of said stem 9i is reduced in diameter and is guided in a suitable guide Sill supported by spider arms 99 i'rom a plate l0() which plate is clamped upon the outer surtace ot' said valve box l0 by screws lill. The back side of the plate 100 has a ralrc seat 102 formed thereupon. This rulre seat surrounding the valve port which is closed by said Valve 77. This ralve 7T is placed as low as practicable in the pumping cham-- ber 4 and the reversal controlling valve 8B is placed slightly higher than the water discharge valve, so that the valve 77 is always submerged. The valve 83 is placed below the float 70 so that it will be submerged and sealed by the liquid in the pumping chamber. This is an advantage first because it is much easier to retain a liquid under pressure than it is a gas and second the discharge of liquid from the pumping` chamber by the opening of' said valve `83 accelerates the opening of the valve by further lowering thevalve 83 with the result that the valve will fifi be cracked open. Vhen this occurs then water is forced down through the passageway 8l, 80, 79 through the passageways in the nut 78 up through the pipe 75 through the passageways 78 and 78 into the dan phragm chamber 58, a part of' the liquid being discharged out through the loose fit around the stem portion 57 and the-remainder acting upon the diaphragm 49 to force the same to the right to close the admission valve and open the exhaust valve. Pressure in the chamber 58 does not need to exceed the pressure in the chamber 44 since the air pressure upon the `exhaust valve 3l also assists in opening said exhaust valve and closing the admission valve. As soon as the valve system starts to move to the right, the motion is accelerated by snapping of the admission valve to its seat. rlhus it will be seen that the motion of the air valve structure in either direction is accomplished with a snap action, this snap being secured chiefiy by the construction and pumping chamber the float rising, live air is acting upon the back of the admission valve 30 holding` it closed. Live air is lealt-` ing past the stem 32 along the guide 47 into 'the diaphragm chamber 44 and is exhausting from same through the open valve port G3. Air is being expelled from the pumping chamber and out the exhaust valve as the liquid level rises. The low level control valve 83 is closed and held in such position by the hair-pin spring 90, the diaphragm chamber 58 is under submergence pressure only and is substantially full of liquid.

The rising of the float 70 lifts the outer end of' the lever 65 and permits the check valve 64 to close whereupon pressure builds up in the chamber 44 relatively rapidly and forces the diaphragm and connected parts to the left as viewed in Fig. l. As soon as the admmission valve 3() is cracked from seat it moves very readily and brings the exhaust valve 3l against its seat, rlhe motion of the valves is small but itis sufficient to secure ample valve opening` Thereafter as the pressure in the pumping chamber rises and begins to expel the liquid through the discharge check valve 77 the float 70 is lowered permitting the weighted lever to open the ball valve 64, This .valve 64 is readily openedat this time since the pressures upon opposite sides of thesame are substantially equal. Any slight leakage that there might be past the valve 83 up through the central tube and into the chamber 58 is free to, leali out of said chamber past the reduced portion 57 of the stem 32. As the liquid level lowers the neat 7 0 finally rests upon the outer end 88 oi' the lever 86 andv when the weight of the float bears heavily enough upon said lever the control valve 83 is opened against internal pressure and liquid is immediately discharged `through the valve port 81 and through the connecting passageways into the diaphragm chamber 58 tending to equalize or substantially equalize the pressures upon opposite sides of the diaphragm 49. As soon ast-his differential motor is sufficiently near-` ly balanced, the pressure upon the exhaust valve 81 assisting, said exhaust valve will be opened and the-admission valve 30 will be snapped to its seat. `Thereupon the compressed air which has filled the pump chamber 7 is permitted to exhaust out of' the exhaust passageway and also the air which occupied the diaphragm chamber 44 dis` charges past the valve 64 into the pumping chamber 4 and from there out the exhaust passageway. At the same time the pressure upon the left-hand side of the dia `phragm 49 drops substantially to atmos- Cil lifting the admission check valve 17 and raises the lloat closing oft' the valve 83 and promptly lilling the pumping chamber with liquid and repeating the cycle ot operation.

The provisions for easy and quick assembly of the pump are noteworthy. There is a straight transverse opening through the head, the central part which forms a guide for the guiding` portion 34 oi' the admission Valve 30 is the most restricted part. This bore is finished to provide a suitable guide. The adjacent bore forming the exhaust port 4:2 is also linished to form a suitable guide for the Wings of the guiding sleeve ot the exhaust valve. rlhe guiding plate @t5 seats in a Vlarger bore closing oil' the communication between the chamber el and the valve pocket 24.

It will be noted thatin assembling thc valve in the head, the diaphragm and clamping plate may be individually assembled thereafter the valve stem 32 With the admission valve 30 thereupon is inserted from the left-hand side of the head as viewed in Fig. l., whereupon the plate 45 is put in place, then lthe guiding sleeve and exhaust valve 31 are put in place and fastened by the clamping nut 39. The diaphragm plate 54, with diaphragm attached, is then threaded upon the threaded portion 53 and the diaphragm brought properly into register and cap 50 with thimble Tet brought into place and passed over the reduced stem portion 57 with the biasing spring suitably interposed. The cap 50 is then secured in place by the screvvs 5l and thereafter the screw cap at the right-hand end ot the bore Vis fastened in place over the exhaust valve 3l. The control valve 63 and its connected lever may then be assembled upon the base of the head. The valve box-l0 With its controlling valve and its discharge valve may next be assembled in connection-With the discharge pipe 'i' and float 70. The central tube With its nut 76 may then be assembled in place.V The sleeve 3 brought into engagement With the head member l and the foot member being brought upon the end ot the sleeve and assembled upon the stud l2 With the cap 13 securing the parts together.

li do not intend to be limited to the details shown or' described except as limited by the claims.`

l claim:

l. In a pump the combination ot a pumping chamber adapted to be iilled by hydrostatic pressure and emptied by pneumatic pressure of inlet and discharge checl; valves` for liquid, a. pneumatic pressure connection, said chamber having an exhaust port, an exhaust valve adapted to close said port When Water has filled the pumping chamber, a differential pressure motor adapted to be subjected to the internal pressure in the cylinder' and being unbalanced in one direcnemesi tion to hold. the exhaust valve against its seat and means responsive to emptying` ot the pumping chamber Vier changing the pressure condition ot the motor to permit opening Volf the exhaust valve by said internal pressure.

2. In a pump the combination elA a pumping chamber adapted to be filled by hydrostatic pressure and enuitied bj.' pneumatic pressure suitably provided. ,said ehamber having an exhaust porty iter pressure lluid, an exhaust valve having` a yieldin face lor closing said port, said vulve :wat againt internal pressure7 a ',:der area than the area of the exlmur--rA @gpm-ed to the internal pressure olE pressure tu peut against .internal pres: e, a stem rmineel'ing.; said piston to .said valve.. and meansaperating at lou' level ot liquid iu the lchamber for opposing the pressure upon said pif-'lon to a sullicient extent to permit said exi-.rust valve to open and exhaust the, pressure fluid in the pumping chamber.

3. In a pump the combination el' a pumping chamber having means :lfor providing pneumatic pressure and having: un haust port, an exhaust vulve sealing over said port, said valve ce bein exposed to internal pressure, a piston el' i.eater ell'ective area than the el'ertive mea et the, exhaust valve exposed to uuernai pre-sure :ui-l tending to hold said exhaust valve lo veut against internal pressure. a connecliou between said piston and seid valve?, means operating at low level el' liquid in the rhumber for opposing the pre:-;sure upcu said piston to a sullicient extent if; permit i d exhaust valve to open and mean,` for holding said exhaust valve open until liquid has substantially filled 1he pumping chamber.

at. In a pump the combin :iu el u pumping chamber 'for liquid adapted io be .ilhvi by hydrostatic prei-g: u-e and emptied by pneumatic pressure, a connection prcvidi1i; pneumatic pressure, an exhaust purl :l'or the chamber leading to atmosphere, an exhaust lift valve seating over the almosixihcrie end of said port to retain pneumatic ilnesuire iu the pump and openingl to exhaust the same, a pressure actuated member et grenier etlective area than the ellectivc area ol' said valve exposed on one side to Ehe pucumuie pressure Within the chamber and connected to said valve 'for holding said valve closed.

5. ln a pump the combination olf a pumping chamber for liquid adapte-l o be illed by hydrostatic pre-"euri` and emptied by pneumatic pressure, u ceuuecti-:iu providing pneumatic pre, ure. an exhaust port lor the chamber leading to atmosphere. au exhaust lift valve seating over the atmd-pheriil cud of said port to retain pneumatic pressure in the pump and opening lo exhaucl he same, a pressure actuated member olI greater cliccthe fluid lior holdine said exhaust valine lid netsnoer tive area than the eii'ective area of said valve Y exposed on one side to the pneumatic pres- Lil) sure within the chamber and connected to said valve tor holding said valve closed, and means operable on lovv level ot liquid in the chamber lor substantially neutraliz` ing the pressure on said pressure actuated member.

6. ln a pump, the combination ola pumping chamber for liquid adapted to be lilled by hydrostatic pressure and emptied by pneumatic pressure, a connection providing pneumatic pressure, an exhaust port Jfor the chamber leading to atmosphere, an exhaust litt valve seating over the atmospheric end of saidv port to retain pneumatic pressure in the pump and opening to exhaust the same, a pressure actuated member of greater-` eliective area than the eliective area oi' said valve exposed on one side to thepneuniatic pressure Within the chamber for holding said valve closed and means for causing the valve to moveto open position upon low level of liquid in the chamber.

'i'. In a pump, the combination of a pumping chamber for liquid adapted to be lilled by hydrostatic pressure and emptied by pneumatic pressure, a connection providing pneumatic pressure, an exhaust port for the chamber leading to atmosphere, an exhaust litt valve seating over the atmospheric end ot said port to retain pneumatic pressure in the pump and opening to erhaustthe same, a pressure actuated member of greater etlective area than the eliective area ot said valve exposed on one side to the pneumatic pressure within the chamber for holdingl said valve closed and means controlled by low level oi liquid in the chamber for applying fluid pressure to the opposite side oit' said pressure actuatediiiember to permit the internal pressure to open said valve.

8. ln a pump having a liquid pumping chamber provided with inlet and discharge valves and adapted to be lilled by hydrostatic pressure and emptied by pneumatic pressure suitably provided, an air exhaust port, an air exhaust valve adapted to close the exhaust port when water has filled the pun'iping chamber, a pressure actuated member subject to pressure in the chamber for holding said valve closed against internal pressure, and means tor neutralizing the lpressure upon said holding means `when lsure lluid inlet passageway, a diiilerential pressure actuated member connected to the exhaust valve, a lirst chamber tor the presa sure actuated member having restricted l.

communication with the fluid inlet port and having a valve communicating with `the se *D pumping chamber, high level control means for closing said valve, pressure in said lirst` chamber tending to close the exhaust valve, a second chamber on the opposite side of the pressure actuated member having a restricted coimiiunicaizion with the outside ot the pump and having` a. valved connection with the interior ot the pumping chamber and low level means for opening said last named valve to admit pressure trom the pumping chamber to said second chamber' pressure in said second chamber tending to opensaid exhaust valve.

10. ln combination a Vpumping chamber having inlet and discharge check valves adapted to be iilled by hydrostatic pressure and emptied by pneumatic pressure, `and having an exhaust port leading to atinospliere, an exhaust valve seating over the at-` mospheric end of said port against internal pressure, said pumping chamber having a pressure fluid inlet passageway, a ditl'erential pressure actuated member connected to the exhaust valve, a iirst chamber for the pressure actuated member having restricted communication with the tluid inlet port and having a valve coiiiniunicating with themember and to the exhaust valve and facing said exhaust valve, said admission valve `being adapted to be held to its seat by live pneumatic pressure when the exhaust valve is open.

ll. ln a pump ot a class described, a

pun'iping chamber having an exhaust passageway, a fluid pressure actuated piston havinga chamber upon each side thereof, a live air admission passageway to the pumping chamber a restricted coiiimun'cation between said live air admission passageway and one oit said chambers, a restricted come inunication between the other ot said chami bers and atmosphere, a. valved pressure coii- I nection from the first chamber to the top ot the pumping chamber, a valved connection from the second chamber to the bottom ot the pumping chamber, level responsive means for controlling said connections and an air valve governing admission and eX- haust olE compressed air to and from the lll) pumping chamber connected to said piston member.

12. ln a pump of the class described, the combination of a pumping` chamber, an exhaust passageway having an exhaust port leading to atmosphere, an exhaust valve closing the atmospheric end or' said exhaust port, a source of compressed air, and ad mission valve between said source coinpressed air and the pumping chamber, said pumping chamber having an admission port adapted to be closed by said admi sion valve and held upon said port by pressure of the compressed air while the exhaust valve is open, a pressure actuated member and means to apply compressed air thereto when water has filled the pumping chamber 'for pulling said admission valve oil' its seat and for bringing the exhaust valve upon its seat to make the discharge stroke ot the pumping chamber.

13. In combination, al pumping chamber having a live air admission passageway, and an exhaust passageway, an admis on port having a poppet valve adapted to seat with live air pressure over said admission port, said exhaust passageway7 having an exhaust port leading to atmosphere with an exhaust valve closing the atmospheric end of said port to retain pressure in the pumping chamber, a pressure actuated member connected to said valves, a chamber i'or said pressure actuated member having restricted communication with the admission passage way and means for relieving the pressure in said last named chamber.

14:. In a device of the class described, a pumping chamber having an admission passageway having an admission port, and an exhaust passageway having an exhaust port, an admission valve seating with live air pressure on its port, an exhaust valve seating against internal pressure of the pumping chamber over its port, a diaphragm having a stem connecting said valves, chambers on opposite sidesoi the diaphragm, a restricted communica-tion between the admission port and one of said chambers, a restricted conimunication between atmosphere and the other of said chambers and level controlled valve connections between said chambers and the interior of the pumping chamber.

V15. In a pump, a pumping chamber, a source of compressed air, a compressed air admission valve, of the litt type seating with the difference in pressure between the live air and the air in the pumping chamber during exhaust, a compressed air exhaust valve of the lift type seating against the dittcrv ence in pressure between the compressed air in the pumping chamber and outside thereof during admission, and a. differential pressure motor connected to said valves and adapted to be unbalanced alternately to overcome the forces acting against said valves.

'netsnoer 1G. ln a pump, a pumping chamber, a live air connection coinprising an admission port and an admission valve on said port when the puinpii g' chamber is substantially empty and held on said port by the pressure o'l' the live air, a leakage pmssageway leading from the live air connection to the interior of. the pumping chamber, means ior closing the inner end oit said leakage passageway when water has substantiall)Y lillcd die pumliiing chamber, and a motor 'tor open-- ing the admission valve dieratcd by the air accumulated in said leali'nge passageway when the inner end thercol;I is closed.

17. ln a pump, a puinpi chamber, :i live air connection comprising admission port and an admission valve seated on said port when the pumping chamber substantially empty and held on said port by the pressure of the live air, a leakage passageway leading from the live air connection to the inte 'ior oi' the punujiing chaniber, means ior closing the inner end of said leakage passageway when water has substantially tilled ,the pumping chamber, and a. valve operating motor having diaphragm (,-onnectcd to said admission valve and a diaphragm chamber communicating with said leakage port intermediate its ends, said diaphragm being actuated by the air pressure accumin lated in said chamber when the inner end o lE said leakage passageway is closed.

18. in a pump, a pumping chamber, a live air connection comprising an :ulmission port and an admission valve seated on ,said port when the pumping chamber is substun tially empty and held on said port by the pressure of the live ai r, a leakage passageway leading from the live air connection to the interior ot the pumping chamber, means lor closing the inner end oi' said leakage passageway when water has substantially lilled the pumping chamber, a motor :tor opening the admission valve operated by the air ac cumulated in said leakage passageway, au exhaust connection 'tor the pumping chamber comprising an exhaust port, un exhaust litt valve seating over the atmospheric end ot of:l said exhaust port against internal pres`- sure, and a. connection between said admission valve and said exhaust,- valve.

19. lin a pump, a pumping chamber, a live air connection comprising an admission port and an admission valve seated on said port when the pumping chamber is substantially empty and held on said port h v the pressure oif the live air, a lealvage flmssagewny lead-- ing itroni the live air connection to 'the iuterior oit the pumping chamber, means controlled by the high level oit liquid in the pumping chamber 'tor closingv the inner end oic said leakage pas'igeway when water has substantially lilled' the pumping chaud 4r, u valve operating motor having a diaphragm connected to said admission valve and havlll() llt) ing a diaphragm chamber communicating with said leakage port intermediate its ends, said diaphragm being actuated to open the admission valve by the air pressure accumulated in said chamber when the inner end of said leakage passageway is closed, an exhaust connetction for the pumping chamber comprising an exhaust port, an exhaust lift valve seating over the atmospheric end of said exhaust port against internal pressure in the pumping chamber, a connection between said admis sion valve and said exhaust valve, a fluid pressure chamber for the other side ci' said motor diaphragm and means controlled by low level of liquid in the pumping chamber for admitting pressure from the interior of the pumping chamber to said latter diaphragm chamber to permit the admission valve to close and the exhaust valve to open.

20. ln a pump, a pumping chamber, a live air connection having a port leading to the chamber, an admission poppet valve seating on the live air side of said port, a pressure motor for the admission valve having a motor chamber1 connected to said live air connection through a restricted inlet connection and having a valved exhaust connection leading to the interior of' the pumping chamber, and high level means governing the closing of said exhaust connection when liquid has substantially lilled the pumping chamber.

21. ln a pump, a pumping chamber, a live air connection having a port leading to the chamber, a poppetv admission valve for said port seating over the live air side of 'the same and being adapted to be held over said port by said live air pressure, spring means tending to hold said valve upon said port,

'a motor for pulling said valve oil said port,

said motor having a motor chamber, a con A stantly open passageway of restricted size leading from the live air connection to said motor chamber, and an unrestricted exhaust passageway from said motor chamber to the interior of the pumping chamber and high level means for closing the said exhaust passageway when water has substantially .tllled the pumping chamber.

22. ln combination, in a pump having a pumping chamber comprising a sleeve meinber, a head member closing the upper end of the sleeve, a foot member closing the lower end ot the sleeve, a discharge pipe extending down from the head member to the lower end of the pumping chamber, a discharge check valve mounted at the lower end ot the pipe, a fluid pressure pipe attending up through the discharge pipe, an air valve having an operating motor communicating with the upper end of saidfluid pressure pipe, and a low level valve having a passageway communicating with the vlower end oit 'the fluid pressure pipe for admitting fluid pres sure from the pumping chamber to said valve operating motor when the discharge stroke has been substantially completed.

ln a pump having a pumping chamber comprising a sleeve, a head member closing the upper end et the sleeve and a foot member closing the lower end of the sleeve, a central discharge pipe extending down from the head member, a valve box at the lower end of the discharge pipe having a discharge check valve opening laterally into the bottom of' the pumping chamber, a pocket in the lower end of said valve box, a stud closing the lower end of said pocket and being connected to the foot member, a fluid pressure pipe connected to the bottom of the head member and lying inside of said water discharge pipe, said fluid pressure pipe entending down into said pocket, a nut secured to the lower end ot said fluid pressure pipe, said nut lying in the pocket, a low level control valve having a passageway communicat ing with said pocket, said low level valve being arranged to admit fluid pressure from the pumping chamber to said fluid pressure pipe when the pumping chamber has been substantially emptied, and an air valve controlling the application of pressure to said pumping chamber, said air valve having a fluid pressure operated motor connected to the upper end of' said fluid pressure pipe.

24. ln a pump, a pumping chamber comprising a sleeve member, a head member clos ing the upper end ot the sleeve member, a foot member closing the lower end of the sleeve, a central water discharge pipe connected to the bottom of the head, the water discharge pipe extending through the head and communicating with the said pipe, a valve bon at the lower end of said pipe, a connection between the box and the foot member, a discharge check valve mounted in said valve box, and controlling the communication between the lower end of the water discharge pipe and the interior of the pumping chamber, a central fluid pressure pipe disposed within the water discharge pipea valve having a passageway communicating with the lower end of said fluid pressure pipe, said valve having an arm extending into proximity with the water discharge pipe, a traveling float guided on the outside of said water discharge pipe and adapted to engage said arm upon low level conditions in said pumping chamber, a fluid pressure control valve for the pumping chamber and a fluid pressure operated motor for said control valve, said fluid pressure motor being connected to the upper end of said fluid pressure pipe.l

ln a pump, a pumping chamber comprising a sleeve, a head member closing the upper endet the lsleeve and a foot member closing the lower end of the sleeve, a water discharge pipe extending from the lower end of the head member towards the foot member, a water discharge valve box connected to the lower end ot' the pipe, a connection between the toot member and the 'lower end of the valve box, a central fluid pressure pipe inside the water discharge pipe, a low level valve having a passageway'communicating said communication, a valve operating `lever extending into proximity to the water discharge pipe, a diaphragm between said motor chambers, an air valve connected to said diaphragm, and a travelling float guided on the Water discharge pipe and adapted to engage alternately said valve operating levers.

26. ln a pneumatic pump, the combination with a pump chamber provided -with water inlet and outlet valves, an air admission valve, and an air exhaust port, of an air exhaust valve located outside `said pump chamber to control said exhaust port, 'a fluid pressurel actuated motor acting during the discharge stroke of the pump to keep said exhaust valve closed against the pressure -in said pump chamber, and Alow level means governing the motor for opening said exhaust valve'.

2 7. In a pneumatic pump, the ,combination with a pump chamber provided with Water inlet and outlet valves, an air admission valve, and an air exhaust port, et' an aii1 eX- haust valve located outside said pump chamber to control said exhaust port, a reversible motor, said motor acting 'in one direction by ilud pressure to keepsaid 'air exhaust valve closed against the pressure in said pump chamber, and means'responsive to low level in said pump chamber to control said motor to permit the internal pressure to open said exhaust valve.

28, lna pneumatic pump, the combination with a pump chamber provided Awith water inlet and .outlet valves,- an air admission valve, and an air exhaust port, of an air exhaust val-ve located outside said pump .chamber to control said exhaust port, means oper-ated by tluid pressure and controlled by high level .in the pump chamber' to apply said exhaust valve to said exhaust port and to hold it thereupon against internal pressure in the pumping cnam'ber, and mea-11s cont-rolled by lowA level in said pump tor vopposing said lirst means to cause the exhaust Leisaosi G* valve to be opened by the internal pressurey in the pumping chamber.

29. 1n a pneumatic pump, the combination with a pump chamber provided with Water inlet and discharge "alvcs, aud air admission port and an air exhaust port. un air admission valve and an air exhaust vvalve located outside the pump chamber to ioutrol said exhaust port, a fluid pressure operated member acting during the discharge strohe oit the pump to keep said exhaust valve closed against the pressure in the pump chamber, and low level meansl governing thc motor to permit the exhaust valve. 'to open, said admission and said exhaust vulves have ing continuous connection with euch other.

30. ln a pump, a pump chamber having water inlet Vand discharge valves, un air admission valve, an air exhaust port und an air exhaust valve seating on said port against the internal pressure of said chamber, :1 motor element connected to said exhaust vulve, :i high level controlled pilot valve Yl'or controlling the application of pressure to said motor element to close the exhaust valve and .open the admission valve, a il uid pressure chamber for applying a balancing pres sure to said motor element, and a low level controlled pilot valve controlling the application of fluid pressure to said lluid pres-- sure chamber.

3l. In a pneumatic pump, a pump chamber having an air admission vulve aud au air exhaust valve, a th'iid pressure chamber saving a motor element connected to said valves, an air supply line, a constantly open restricted air passage from the liuc lo the lfluid pressure chamber, a passage from he pump chamber to the lluid pres ire cuambcr, a pilot valve controlling said lu' er pa apc, and level controlled means operating on high level to close said pilot valve.

In a pneumatic pump, a pump chumber having an air` admission valvi,l and un air exhaust valve, a ljluid pressure chamber han ing a motor element connected to said valves, an air supply line, u cimstuntljiy upcn restricted air passage from the line lo the luid pressure chamber, a passage Ylruui the pump chamber to the i'luid pressure huurber, a pilot valve controlling` said latter pas sage, said pilot valve comprising a check valve opening inwardly towards the lluid pressure chamber, means tending to hold `'sa-id check val-ve open, and a float operating on high `level of liquid in the chamljier to neutralize said holding means to permit the check valve Vto close.

ln a pneumatic pump, a pump chamber having an inlet for fluid pressure aud au exhaust port therefor, an exhaust vul vc scat ing on said port against the internal preisure in the chamber,` means to hold said valve on said port by the lluid pressure in 'fil lud

llt)

lill] said valve on said port by therfluid pres-` sure in the pumping chamber with a force Which .increases directly with the internal pressure in said pumping chamber, said 'means comprising' a motor element having a larger ellective area than the eective area of the exhaust valve, both said motor ele` ment and said exhaust valve being exposed to the same internal pressure in the pump chamber but in opposite directions.`

35. In combination, a pumping chamber, an air control valve mechanism therelor having admission and exhaust passageways terminating in seats facing in opposite directions in line with each other and comprising a valve stem having a fluid pressure motor member connected to one end thereof, said stem having a shoulder, a sleeve having an admission valve at one end embracing the stem and engaging the shoulder', an exhaust valve on the stem engaging the other end of the sleeve, a nut :tor the stem for holding said sleeve and exhaust valve rigidly onw said stem, said admission and exhaust valves facing the corresponding seats and cooperating therewith.`

36. ln a pneumatic pump, the combination ol a barrel for providing a pumping chamber, a. head member for the barrel contain ing an air control valve mechanism having movable parts, said head having a transverse bore for housing the movable parts of the mechanism, said transverse bore com- ,prising an admission valve seat and an exhaust valve seat, a plug closing one end oi" the bore adjacent the exhaust valve seat and deiining an exhaust valve chamber communicating With exhaust, an apertured plate secured across the bore adjacent the admission valve seat delining on one side an admission valve chamber, a diaphragm across the outer end ot the transverse bore and defining with said plate a diaphragm cham ber, a cap clamped on the edge oit the diaphragm and defining a second diaphragm W, chamber, a central stem secured to the diaphragm and passing through said apertured plate, said stem having a reduced portion starting with a shoulder, a sleeve having an admission valve member disposed in the admission valve chamber, said sleeve abut ting said shoulder, an exhaust valve member on the stem anddisposed in the exhaust valve chamber, said exhaust valve abutting said sleeve, and meanson the end oit the stem tor clamping the exhaust valve against the sleeve, said head having passagevvays tor admission and exhaust connections to the pumping chamber under the control ol said valves, and means to control the ap plication of pressure to said diaphragm chamberso 3i. ln a pump having a pumping chamber', an air control valve lor the pumping chamber, a diaphragm having a central opening therethrough, a clamping plate having a hollov:r stud extending through the opening in the diaphragm, a nut lor the stud, said nut clamping the diaphragm against the plate, a valve stem' secured to the hollow stud, said stem being connected to the air control valve, means supporting the edges oi' the diaphragm and Yforming motor chambers on each side 0i the valve, said stem extending loosely through an opening in the wall of one ot said motor chambers to provide a guide, and also to provide a restricted fluid passageway kept open by movement oi the stem in the opening.

lin a pump having a pumping chamber, an air `control valve therefor, a diaphragm having a central opening, a clamping inember having a stud extending through the opening, a threaded clamping plate cooperating therewith to clamp the diaphragm between them, means supporting the outer edges of the diaphragm and forming a motor chamber tor one side thereof, a stem :tor the air control valve, said stem being cured to the clamping member on the diaphragm, said motor chamber having an opening through one vvall thereof, said stem projecting loosely through said opening to provide a restricted fluid passageway which is kept open by the movement ol the stem.

lin Witness vvhereol, l hereunto subscribe my name this 26th day oi December 1923. BURTON S. Allildrlll.

lll()

Images