USRE14946E - aikman - Google Patents

Description

B. S. AIKMAN.

PUMP AND PUMPING'SYSTEM.

APPLICATION FILED DEC. 1. I919.

Reissued Spt. 7,1920;

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PUMP AND PUMPING SYSTEM.

APPLICATION FILED DEC. 1. 1919.

Reissued Sept. 7, 1920.

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PUMP AND PUMPING SYSTEM.

APPLICATION FILED DEC. 1. I9I9. Reissued Sept. 7, 1920.

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BURTON s. AIRMAN, 0F MILW UKEE, WISCONSIN, ASSIGNOR 'ro NATIONAL BRAKE; & ELECTRIGCQMPANY, 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

PUMP AND PUMPING SYSTEM.

Specification or Reissued Letters Patent. Rei s d S t 7' 1920 Original No. 1,253,558, dated January 15, 1918, Serial No. 51,524, filed September 20, 1915. Application for reissue filed December 1, 1919. Serial No. 341,805.

To all whom it may concern:

Be it known that I, BURTON S. AIKMAN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Pumps and Pumping systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forminga part of this specification. y

My invention relates to pumps and pumping systems and contemplates an improved apparatus which may be employed as an isolated plant for furnishing water to a residence or an industrial establishment from a nearby source, such as a well.

It is the purpose of my invention jtopr'ovide an improved system which supplies water fresh from the well, that is,'without the intervention of a storage or reserve tank,

and which will be under faucet control,

by which I mean that "the flow of water is controlled by the acts of opening and closing the faucets which form the supply outlets of the system.

To supply water fresh from the well and to maintain the flow of water under faucet control is broadly a matter of prior art. The apparatus and systems heretofore known and used were, however, subject to inherent difficulties due to the fact that the pneumatic control employed led to frequent misoperations, such as are commonly called blow overs, where the system becomes cleared of water and the compressed air employed as an operating medium is wasted.

Faucet control of water delivery in a system employing a single cylinder pump is shown for the first time in my co-pending application, Serial No. 50,941 filed September 16, 1915.

Faucet control of a water supply system' vide a single cylinder pump and an air spring or auxiliary pumping chamber to fill in the gap between the discharge strokes of the single pumping cylinder.

A further problem is a requirement, the necessity for which does not arise in open pumping; namely, that the valves of the pump be made so that they will prevent leakage either of air or of water. In the present case the main valves are all provided with yielding faces and seat in such a manner that-the pressures which they are to retain tend to hold them tight upon their seats. I

Another problem in the matter Offaucet control is the matter of completing the throw of the air valve mechanism from air admission to exhaust position, or vice versa. In open pumping the rise and fall of water in the pump is quite rapid and no particular difliculty isen'countered in shifting the air valve or valves. In a faucet controlled system the flow of water may cease or be greatly diminished, as by the closingof the faucets just at the critical point in the operation of the pump where starting of'the valve, shifting motion should begin. Conse quently, unless some means is provided for making this shifting operation independent of the rate of water discharge, the pump will center and the air will blow away, leaving the system dead. Some means must be provided for starting the valve shifting op-' eration at a predetermined stage of operations, such for instance as low level on discharge or high level on filling of the pump, and some means must be provided for insuring a complete operation or full stroke of the valve Operating mechanism after the shifting operation is initiated.

A furtherrequirement is a valve shifting means which shall invariably have sufficient power to operate the valve mechanism even. on high air pressure. As previously explained, where the air valves are held to seat by pressure, it is essential that the means for shifting the valves be invariably powerful enough to move the valves regardless of the pressure in the pumps This I accomplish by the use of apressure motor operated by the same fluid pressure which tends to' hold the valves to seat. r 1

The conjoint use of the valves held to seat by pressure andthe fluid pressure motor for pulling the valves from seat against pressure, as herein described and disclosed,

from, the alternations being secured by the actuations of valve mechanisms, which in turn, are dependent, on the one hand, di.'

rectly and. mechanically upon the fall of the water in the chamber, and on the other hand upon a positively operating time element device.

It will be understood that the system is constantly under pressure, and it is, therefore,- a further object of my invention to provide an apparatus which will be as free from leaks as possible, which operates with a minimum consumption of air, and which operates reliably and positively.

Notwithstanding the gradual rise and fall of the water in the chamber, I provide means for suddenly actuating the valve mechanism, an especially desirable feature.

My invention is illustrated in the accompanying drawings, in which:

Figure 1' is a more or less diagrammatic view illustrating the system as-a whole; Fig. 2 is a plan view of the pump; Fig. 3 isa vertical axial sectional view taken on the .plane of the line 3-3 of Fig. 2 and looking in the direction'indicated by the arrows;

'the plane of the line 55 of Fig. 2 and looking in the direction indicated by the arrows, Figs. 2 and 5 being drawn on a larger scale than Figs. 3 and 4.

Referring first to Fig. 1, which, as before stated, is diagrammatic, it will be seen that the well curbing is illustrated at 8, the water level being indicated at 9. The pump structure, which I have indicated broadly by the reference character 10, is disposed in the-well at a suitable distance below the water level therein, as will be described,

The pump structure has leading therefrom threepipes, an air pressure pipe 11, an exhaust pipe 12, and a water discharge pipe 13. The air pressure pipe 11 is connected with a compressed air tank 14, in which air is'compressed by means of a compresser 15, operated, for'instance, by an electric motor 16. It will be clear to those skilled in theart that the compresser 15 may be operated by any suitable means, such as a gas engine Y or steam engine, and if desired, means may be provided for'automaticallystarting and stopping the prime :mover dependent upon lation' in a residence, for instance.

the fall and rise of pressure in the tank 14.

In the pipe 11 the cut ofi valve 11 air turn leadstoan outlet faucet 19. By means of a pipe 20 the discharge pipe 13 is connected with a chamber 21, called an air spring and closed except for the entry pipe 20, for a purpose which will be pointed out presently; I

It will now be understood that this system represents an isolated plant for ins f alle water discharge pipe leads from the well conveniently nearby, to the distribution pipe in the building, and the compressor, motor, compressed air tank and chamber are suitably'housed in anyconvenient way.

As-before pointed out, air pressure is con stantly maintained upon the system. It is therefore necessary to maintain a certain pressure between predetermined minimum and maximum limits in the compressed air tank 14, this being done by theproper starting and stopping of the compressor 15,

either manually or automatically. It has sired limits.

It will appear as this description proceeds that with the pressure properly maintained upon the system, everything is at rest so long as all the outlet faucets 'of the system are closed, but as soon as one of them is opened the pumping 'mechanism will operate to maintain continuous the .flow which immediatelyjcommences. When the faucet is, again closed the apparatus comes to rest and. it will appear that the feed has been direct from the well with the proper pressure to distribute it to whatever points desired.

I refer now to Figs. 2 to 5 inclusive, to describe the pumping mechanism. A head member 22 and a primary base member 23, both of circular form, are jointed by a cylindrical housing '24, which forms a' water chamber 25. As illustrated in Fig. 4, the head member 22 and the primary'base member 23 are tied together by means of two" pipes 26'26, which thread into the head member 22and pass through'openings in the primary base member'23,the lower ends of these pipes being screw threaded for the reception of nuts 27 which, when tightened, clamp the housing 24 firmly in place to form a watertight and airtight compartment. Secured to the under side of the primary base member 23, by means of screws 28-28, is the secondary base member 29, which has extending downwardly therefrom a central boss 30 to which a nut 31 is screw threaded, a conical screen 32 being clamped between the nut 31 and the boss 30 and thus held against the under side of the secondary base member 29. The secondary base member. 29 is provided with two water inlet openings 33-33, each of which is controlled by a lift valve 34, normally held seated by means of springs disposed between the respective valves and the primary base member 23.

The primary base member 23 is provided with an axial opening 37 which is surrounded by an upwardly extending boss 38, a cylinder 39 being supported upon and extending upwardly from said boss, as clearly shown in Figs. and 4. The top of the boss 38 forms a valve seat 40, and this valve seat is adaptedto be engaged by the ball float valve 42, which isconfined within the cylinder 39. As shown in Fig. 3, the top of the cylinder 39 is closed for the proper retention of the ball float valve 42. The cylinder 39 is provided with elongated vertical slots 43,

through which the water may pass inwardly and outwardly, as will be described. En

trance of water into the chamber 24 is thus provided through the screen 32, openings opening 37, and slots 4343. The

exit of water from the chamber 24 is provided for through the slots 4343, the opening 37, the passageways 4444, formed by the spider construction of the top of the nuts 27-27, and the pipes 26- 26, the further course of the water being later described.

The head member 22 is provided with an atmosphere passageway 47, the compressed air inlet passageways 48 and 49, the primary water chambers 50-50, and the secondary water chamber 51. These passageways and chambers are isolated fromeach other, as will be described, the atmosphere passageway being connected with the pipe 12, the compressed air inlet passageway 48 being connected with the pipe 11, andthe secondary water chamber 51 being connected with the discharge pipe 13.

Referring first to the exhaust passageway 47, it will be seen that it so fashioned as to lead to the annular opening 52 in the bottom of the head 22, a valve seat 53 surrounding this opening.

Supported from the under side of the head 22 is an annulus 54, disposed coaxially with the cylinder 24 This annulus forms a water chamber 99 and supports a diaphragm cham ber structure which will now be described. This structure is composed of two primary parts 55 and 56, the former being mounted in and closing the bottom of the annulus 54 and the latter being secured to the under side of the former with the diaphragm 57' upper rim below the exhaust passagev 52 so that the incoming water overflows the rim of the annulus at each filling stroke. The top edge or valve seat 70 of the upwardly extending rim 64 lies below the edge or rim of the annulus 54 so that the water which is trapped above the rim 70 is forced down into the motor diaphragm chamber 58 at each downward movement of the diaphragm. Upon upward movement of the diaphragm the water or part of it is first expelled through a restricted opening 90, as will be described later and as the valve face 96 leaves the seat 76 the pressure is relieved within the motor diaphragm chamber 58 as will be described later. The forcing of the water through the opening 89 provides sufficient delay of the shifting of the valves to permit the chamber to fill with water. This motor chamber 58 and its adjuncts thus forms in effect a liquid dash pot for securing the desired delay in the shifting of the valves. i

' A valve stem 65 is screwed into a guide block 66, which, as illustrated in 3, is mounted for reciprocation in a sleeve 67, disposed coaxially in the opening 52. A valve 68, double faced with a yielding material such as rubber so that it acts as a valve on both sides, is clamped upon the valve stem 65 between the block 66 and 'a collar 69. The upper valve face coiiperates with the valve set 53, and the lower face cooperates with the valve seat 70 formed at the top of the rim 64, as will be described 7 presently.

Mounted so as to be engaged by the block 66 is a valve stem 71, which connects the compressed air passageways 48 and 49. A valve seat 73 surrounds the passageway 72, and a valve 74, carried upon the stem 71, coiiperates with this valve seat. The face of the valve 74 is also formed of a yielding material such as rubber. The valve 74 is guided in a central opening 75 at the top of the head member 22, which opening is closed by a plug 76, between which and the valve a spring 77 is disposed. i

The lower end of the stem 65 extends downwardly into the cup member 61, wherein it is provided with a head 78, adapted to be engaged by the bottom of the cup memmember. or cage is made in the form of a spider, in order to permit of the insertion of this; head member.-v A spring'79 is dis posed between a collar 95 on the head member and the under side of the top of the on -member or cage.

he bottom of the diaphragm chamber 59. is closed by a partition 80, between which and the under side of the diaphragm 57 a spring 81 is disposed. An opening 82 is opening being controlled by a relief valve 83, carried upon a stem 84, guided in the opening 82, by means of ribs or lands 85 on the valve stem .84. As will be described, the top of the stem 84 is adapted to'be engaged by the screw 62, in thedownward movement of the diaphragm, to open the valve 83 against the tension of the. spring 86. The chamber 87 below the partition 80 is connected by means of a small passageway 88 with the atmosphere passageway 47'.

The upper diaphragm chamber 58 is provided with a restricted outlet 89, which affords a time element in the return of the diaphragm 57 from its lower to its upper position, the interval thus provided for being utilized for the refilling of the pump.

The operation ofmy pump and system is as follows:

Let it be assumed that-the pump is submerged in the water of the well as illus-- trated in Fig. 1 and that the proper pressure issupplied by the tank 1 1. As soon as one of the faucets 19 is opened water at once flows therefrom and in doing so re-' lieves the pressure within the air spring 21, 1

- thus relieving the back pressure of the water V in the pump chamber 25 and permitting the 40' discharge of water therefrom. Assuming that the pump is on the discharge stroke the water inlet valves 34 are closed and held closed by pressure, the Water dischargevalves 92 are forced open by the discharge of water. The air admission valve 74 is held open by the stem 71 thereof being held by the block 66. -'The exhaust valve 68 isv held closed, being applied to its seat by the spring 81, and also held by the pressure-ofthe compressed air within the chamber 25. The

relief valve 83 is closed and held closed by the pressure of the spring 86 so'that the pressure of the water in the discharge main prevails in the motor chambers 59 (because of the communication through the passageway 90). the seat 70 so that the water caught in the annulus 5 1 communicates with the motor chamber 58;

In thecondition shown in Figs. 3 and 4 the'apparatus has just reached a point in the discharge stroke where the consignment of water in the chamber 24 has been driven therefrom by the action of compressed air meansof the" spring 81. 'the action reaches the point illustrated in The valve face 96- is away from sure within the chamber 25.

ing 37 and upwardly through the pipes 2626, the air pressure was not effective in its action upon the top of the diaphragm 57 for the reason that the pressure is also transmitted to the under side of the diaphragm by way of the passageway 90 leading from the diaphragm chamber 59 to one of the chambers 50, as shown in Fig. 4.

It will be obvious that while the expulsion operation is going on the water in the chambers 50 is under the pressure of the compressed air, and, since that pressure is transmitted to the under side of the diaphragm 57 by means of the passageway 90, the diaphragm will be balanced so far as effective air pressures are concerned and will be retained in its uppermost. position by When, however,

Figs. 3 and 4, the pressure of the motive fluid on the under side of the diaphragm 57 is cutoff by the valve 42 and the pressure on the upper side of the diaphragm builds up until it easily overcomes the tension of the spring 81, and the pressure of the water in chamber 50. This moves the diaphragm 57 toward its lowermost position compressing the spring 79. The pressure of the compressed air in the chamber 25 is exerted upon the water which is trapped in the cup formed by the annulus 5e and as the pressure in the chamber 25 becomes higher than the pressure in the water discharge chamber 50 the difference in pressures upon the motordiaphragm ovecomes the springs 81 and 79 forcing the diaphragm down, injecting some of the water trapped in the annulus 54 down into the motor chamber 58 and ejecting some of the'water in the motor chamber 59 out of the orifice 90. The first movement of the diaphragm 62 and attached spring cage 61 downward removes the effect of the spring 81 upon the exhaust valve stem, so that the valve 68 is held against the exhaust valve seat solely by thepres- Further movementof the diaphragm and cage compresses the spring 79 between the top of the cage 61 and the head 95on the end of the exhaust valve stem 65. I I

Further movement of the diaphragm 57 next causes engagement of the screw head 62 with the stem 84 of'the relief valve 83 permitting the pressure in the chamber 59 and under the. diaphragm.5 7 to escape to exhaust through thepassagewaySS. Then suddenly the motor diaphragm is'raised to its full power and moves down very rapidly further compressingthe springs 79,- 81 and 86-and further opening the relief valve 83. The full power of the motor is developed at this stage in order-to enable it to pull the exhaust valve ofi ofits. seat against the :pressure of'the COIIIPIBSSBClalI'lIl the cham- As soon as the valve isicracked the pressure escapes from the chamber 25 rapidly and tends to equalize on both sides of the exhaust valve 68 until a point is reached vwhere the difference in pressure upon the two sides of the valve are insufficient toovercome the tension of the compressed spring, 79. Finally the spring overcomes the pressure 1101d ing valve 68 toward its seat and suddenly expands. In this downward movement of the diaphragm three changes occur. The valve 83 is moved to its open position by reason of the engagement of the screw 62 with the top of the stem 84. The valve 68 is :brought down on theseat 70,because of the engagement of the top of the head'78 with i the under side-of the top of the cup member 61. -The valve 7a is brought down on theseat 73. This action opens thev water chamber to the atmosphere and closes off thecom-v pressed air to the waterv chamber 25. At the same time the under sideof the diaphragm 57 is exposed to the atmosphere for exhaust. sumed the, chamber 25 immediately commences to fill, check valves 34L35 opening 1;- under the head-of waterv in the well, and

this action continues until the valves are. again reversed. I provide for this refilling, period as follows: It xwill be seen that, as; soon as the valves have been thrown in their lowermost position, the diaphragm 57 will immediately begin to rise under the influence of th'espring 81.- It is retarded in resuming,

this position, however, ,because the vwater inthe diaphragm chamber: 58 mustall find its way out-through the restricted passagel/Vhen these conditions are asphragm chamber 58;. Assoon as the com-. pressed air has escaped from the main pump chamber 25. (and this occurs very rapidly) the water from the well immediately flows intothepump due to thesubmergence ressure-and tends at once to fill the c am- I ber 25.. a

' As the valve 68is down upon its seat 7 O andas thesoring 79 tends to hold the valve in that position, and. asthe area of the valve is smaller than thevarea of the diaphragm, the pressurevofthe spring 81 uponthe diaphragm 57- does not create sufiicient internal fluid pressure in the chamber, 58 to .force the valve (SS-upwardly off-ofthe seat 70 and 's o.- a

consequently acertain amount of delay is created in the closing, of the exhaust valve which ldelay. suffices. for the filling of the pumpchamber 25 from the well.- The action of the timewelement'creating the delay is as follows: \Vhen the valve face 69 is first brought against the valve seat 70 it will be recalled :thatthe top ofthecage has come into engagement with the head 78-of the stem, 65 forcingthe valve down. In other words the lost motion between these parts was taken up in one direction and before the valve face 69 can be'forced 0H of the seat 7 O thelost motion must be taken up in the reverse direction.v Thespring 79 having been compressed between the collar and the topof the cage 91 now exerts pressure in two directions first the pressure on the valve 68 in a downward direction tending to hold the valve on the seat 70 and it exerts an upward pressure on. the diaphragm 57 tending to compress the fluid in the motor chamber 58. The pressure of the spring 79 distributed over the small area of the valve face 69 seated on the port 70 ismuch greater per unit of area than is the pressure of the same spring per unit area distributed over the large area of the diaphragm 57. Consequently if no other influences operated and ifithe chamber 58 :were otherwise tight the valve 68 would remain seated on the valve seat 70. However, I have provided means for permitting the fiuid pressure within the chamber 58 to escape Theorifice-89 in the walls ofthe chamber 58 permits the fluid to escape. However, if no further means were provided the spring :79 would bring the diaphrag n57 up, discharge the liquid through the hole 89 and bring the bottom of the cage 61 againstthebottom of the head 78. This would not .open the admission valve 74; nor

closetheexhaust, valve 68.

The. spring. 81 below the diaphragm 57, and the spring 86 working on the relief valve 83, .aid the spring 79in forcingthe diaphragm upwardly to expel the liquid through the hole 89, and when the spring 79 has brought vthe. cage 61 into engagement withtheiend ofthe head 78the work of.

the spring 79 ceases and the valve 68is'free;

to rise from the seat 70, and the pressure of the spring 81 instead of being transmitted to-the liquid is applied solely to the stem 65. The spring 86 aids the spring 81 to the limit of the upward movement of the valve 83. This occurs atsubstantially the same time that the lost motion is taken up between the cage 61 and the end of the valve stem 65. The work of the spring 81 then consists in opening. the admission valve 74 against the live air pressure above it and closing the exhaust valve 68. After the valve 74 is cracked from its seat it moves away easily and the spring 81 throws it suddenly causing a snap action shift of both valves 74 and 68. As pressure then enters the chamber 25 to discharge the water therein the pressure on the upper side of the diaphragm 57 quickly'builds up to equal the pressure on the lower side thereof and the opening 89, and I am therefore enabled to after the diaphragm 57 has made a consider-.

provide whatever time is necessary for re filling, dependent upon conditions.

It has been my experience that, with a structure builtsubstantially along the lines of that illustrated in the drawings, and substantially of those proportions, submerged a few feet below the level of the water in the well, a period of about 1.5 seconds is re-' quired for the filling operation, and I therefore regulate thesize of the aperture 89 to permit of a period of that time for the up ward movement of the diaphragm 57 before the head 78 is engaged by the bottom of the cup member 61 to throw the valves in their upward position.

It is pertinent here to point out-that the stem 84 of the valve 83 is not engaged until able downward movement and, conversely, is released after a small portion of the upward movement of the diaphragm has been accomplished. The downward movement of the diaphragm and the opening of the valve 83 releases the water confined there, and in the upward movement of the diaphragm the valves closes,- under the following tension of the spring86, to retain the water above it. It may be assumed. that in this refilling operation which has been described the water reaches the level indicated by the dot-anddash line, at which time the valves are reversed so as to close the chamber 25 to the ,atmosphere and open it to the compressed air.

the check valves 9292, and into the sec= onda ry water chamber 51, these check valves beingheld on their seats under normal conditions by means of the springs 93-93, dis-' posed between the valves and the plugs 94-94.

'From the chamber 51 the water passes to the distribution system byway of the pipe 13. This operation then continues until the float valve 42 is brought down to the seat 40, whereupon the valves are reversed and the operation hereinbefore described is repeated.

It is assumed, of course, that this oper .ation which has been described takes place only when there is a withdrawal of water from'the system. If all the outlets of the distribution system are closed, everything will be at rest since, although there is pressure on the top of the water in the chamber 25, there is no outlet for the water. When the water is forced out through the discharge pipe 13 it will be seen that, in

addition to going to the distribution pipes 17 and 18, the water will also be forced into the air chamber 21, confining an air cushion above the water level formed therein, as

indicated in dotted lines.

The speed with which the water chamber fills to the level of coursedepends upon the sizes of the inlet passageways and the head of the water in the well. cated, with a structure as shown, the time is about 1.5 seconds. discharge and distribution pipes is great enough this momentary cessation of pressure will be hardl perceptible at the faucets, particularly since the expulsion period, assuming one or more faucets to be open for a considerablev length of time, consumes practically all of the time. However, in order that the gap in the flow' may be properly filled in, I provide'the air chamber 21, to which the part 20 delivers from water in the discharge pipe 13 is under pressure, as it is, practically all of the time, a certain'amount of water is forced up into the chamber 21 This action compresses the air in the chamber and forms a cushion, which is maintained so long as the pressure is not relieved. As soon as the pressure is relieved, however, by the cessation of pressure in the pump with a faucet open, the

If the capacity of the As before indi- 120 the discharge pipe 13. Obviously, whenthe airis given opportunity to expand and in doing so forces out the water which: has become packed therein and provides a flow from the faucet during the refillingperiod of the pump. This'chamber 21 will, of

course, be distinguished from 'a storage tank,

in the chamber 21 is kept properly replenished by bubbles of air which follow the expulsion of water from the water chamber 25' of the pump structure, and that it is automatically relieved from an excess of air by theopening of a faucet, this latter action' being instantaneous and imperceptible to the opening of the faucet. The air spring 21 thus operates like another pumping chamber in a double cylinder pump.

It will be seen that the lower level of'the.

water in thewater chamber positively determines the reversal of the valves, and that the upper level of the water is determined by a positively and uniformly operating time element. In this way-reliable operation is secured and the desirable sudden action of the valve at the end of a refilling or emptying operation is effectively obtained. Suction may be applied on the pipe 12, if desired. Certain of the broad features of the present invention are disclosed and claimed in my prior copending application, Serial No. 50,941, filed September 16, 1915.

-I have endeavored to embody the features of my invention in a simple structure involving a minimum number of parts of simple design, and some of the more limited of the appended claims are directed to these more specific features.

Iclaim: V

1. Ina pump, a water chamber, an auxiliary chamber having inlet and outlet valves said auxiliary chamber being connected with said water chamber, an exhaust port for said water chamber, a compressed air port for said water chamber, valves for.

said ports, pressure means for operating said valves, one side of sald pressure means being exposed to the pressure in said auxiliary chamber to close the exhaust port and open the compressed air port, and the other side being exposed to the pressure in that this water said water chamber to open the exhaust port andkclose thewcompressed airport, and a valve for controlling the connections be- I tween-said chambers.

2. In a pump, awater chamber, an-aux- H iliary chamber having inlet and outlet valves said auxiliary chamber being connected with said water chamber at thebottom of the latter, an exhaust port for said water chamber, a compressed air port for i said waterchamber, valves for said ports, pressure. means for operating said valves, one side of said pressure means being ,ex-

posed to thepressure in said auxiliary chamher to close the exhaust port and openthe compressed air port, and the other side being exposed to the pressure in said-water chamber to open the exhaust port and close the compressed air port, and a float valve for controlling the connections between said chambers.

3. In a pump, a water chamber, an auxiliary chamber having inlet and outlet valves said auxiliary chamber being connected with said water chamber,-an exhaust port for said water chamber, a compressed air port for said water chamber, valves for said ports, pressure means for operating said valves, one side of said "pressure means being exposed to the pressure in said auxiliary chamber, and the other side being exposed to'the pressure in said water chamber, avalve for'controlling the connections between said chambers, and a valve for controlling the application of the pressure in said water chamber to said pressure means.

4. In a pun1p,a water chamber, an auxiliary chamber-having inlet and outlet valves said auxiliary chamber being con-' nected with said water chamber, an exhaust port for said water chamber, a compressed air port for said water chamber, valves for said ports, pressure means for operating said valves, one side ofsaid pressure means being exposed to the pressure in said auxiliary chamber, and the other side being ber, a valve for controlling the connections between said chambers, a valve for controlexposed to the :pressure in said water cham- Y ling the application of the pressure in said 1 water chamber to said pressure means, and

means and, controlling said exhaust and compressed air portsand said main pasisa-geway. 1

6. In a pump, a waterchamber, anauxs iliary, chamber having inlet and outlet valves said auxiliary. chamber being con nected' with.- said water chamber, anzexpressed air port; for said water chamber, pressure means connected on oneside With the auxiliary chamber, and on the other side connected with the interior of the water chamber by a main and a restricted passage-v way, a valve structure operated by saidpressure means and controlling said exhaust and compressed air ports and said main passageway, and an exhaust relief passage -from the first named side ofsaid pressure means; I

"7. In a pump, a water chamber, an auxiliary chamber having inlet and outletvalves said auxiliary chamber being connected with said water chamber, an exhaust port for'said water chamber, a compressed air port for said waterchamber, pressure means connected on one side with the auxiliary chamber, and on the other sideconnected with the interior of the water chamber by a-main and a restricted passageway,

a valve structure operated by said pressure means and controlling said; exhaust and compressed air ports and said main pas-,

sageway, and a float valve controlling the connection between said water chamberand said auxiliary chamber; I

8. In'a pump, a water chamber, an auxiliarychamber having inlet and outlet valves said auxiliary chamber beingconnected with said water chamber, an exhaust port for said Water chamber, a compressed airport for saidwater chamber, pressure means connected on one side with the -auxiliary chamber, and onthe other side con-.'

nected with the interior of the water chamber by a main anda'restricted passageway,

. a valvestructure operated by said pressure means and, controlling said" exhaust and compressed air ports-and saidamain pas sageway to close the exhaust port, open the compressed air port, and open said main passageway in one'direction and reverse the action in the opposite direction.

9. In a. pump, a water-chamber, an auxiliaryv chamberhaving inlet and outlet valves said auxiliary chamber being connected with said water chamber, an exhaust port forsaid water chamber, a compressed air; port for said water chamber, pressure means connected on one'side with the auxiliary chamber, and'on the other side con-. nected with the interior of the water chamber by a main and a restricted passageway, a valve structure operated by said pressure means and controlling said exhaust and compressed air ports and said main pashaust port for said water chamber, a? com- 7 ,means connected on one'side with the auxiliar-ychamber, and on-the other side connected with the interior of the water chamber by a main and a restrictedpassageway, avalve structure operated by said pressure means and controlling said exhaust and compressed air ports and said main passageway to'close the exhaust port, open the compressed air port, and open said main passageway in one direction and reverse the action in the opposite direction, and a float valve controlling the connection between the water chamber and said aux liary chamber.

[11. In the pump, a water chamber, an

auxiliary chamber having inlet and outlet valves said auxiliary chamber being connected with said water chamber, an exhaust port for said water chamber, a compressed air port for said water chamber, pressure meansconnected-o'n one side with the auxiliary chamber, and on the other side connected with the interior of the water chamber by ama'in and a restricted passageway, a valve structure operated by said pressure means and controlling said exhaust and compressed air ports and said main passageway, said valve structure being moved by the latter portion of the movement of said pressur'emeans. I

12.-In a pump, a-water chamber, an aux-v iliary chamber having inlet. and outlet valves said auxiliary chamber being connected with said -water chamber, an exhaust port for said water chamber, a compressed air port for said water chamber, pressure means connected on one side W1th-the auxiliary chamber, and-on the other side connected with the interior of the water-chamber by a main and a restricted passageway, a valve structure operated by said pressure means and controlling said exhaust and compressed air ports and said main passageway, and afloat valve controlling the connection be'tween said-water chamber and said auxiliary chamber, said float valve being confined for vertical movement in a cylinder through which water may pass.

113. Incombination, a pumping chamber havingxwater inlet and discharge valves, compressed air admission and exhaust valve means, a fluid pressure motor for operating the air valvemeans in one direction and a means time controlled element governing the return only of said air valvemeans.

'14. In combination, a pumping chamber having'water inlet and discharge valves, an

air, admission valve, an air exhaust valve,

spring means for applylng the exhaust valve to its seat and a time controlled element governing the operation of said spring In combination, a pumping chamber having water intake and discharge valves,

an an admission valve, an air'exhaustvalve, spring means for opening the air admission valve and a time control device governing the operation of said spring means.

[16. In combination, a pumping chamber having water admission and discharge valves, a compressed-air admission valve, means governed by low level conditions of the Water in the pumping chamber for closing the compressed air admission valve, means for opening the air admission valve and a time controlled element governing said latter means.

17. In-combination, a pumping chamber having water admission and discharge valves, a compressed air admission valve, means controlled bylow level conditions in the pumping chamber for closing said'air admission valve, and time controlled means for opening said air admission valve.

18, In combination, a pumping chamber having water admission and discharge valves, an air admission port, an air admission valve adapted to be held against said port by the pressure of said compressed air, means controlled by low level conditions within the pump for permitting said valve .to move to seat when the water has been discharged from the pumping chamber, time controlled ,means foropening said air admission' valve, said means comprising a,

spring adapted to throw the air admission valve away from its seat.

,19. In combination, a pumping chamber having water inlet'and discharge valves, an air admission valve adapted to seat with the air tending to enter the 'pump. chamber,

an air exhaust valve adapted to seat with the' air tending to leave the pump chamber, a fluidpressure'motor for opening the ex haust valve against pressure and for closing theadmission" valve with pressure when water has been discharged from the pump element.

20. In combination, a pumping chamber.

cli amber, and means for causing'the opening of the admission valve against pressure and closing of the exhaust valve with pressure, said latter-means having a time controlled having water inlet and discharge valves, an

air-admission valve adapted to seat with pressure tending to enter the chamber, and

an air exhaust valve adapted to seat with pressure tending to leave the chamber, a v

fluid pressure motor controlled by low level conditions within the pumping chamber for seating the admission valve with pressure and opening the exhaust valve against pressure, spring means for opening the admission valve against pressure and seating the exhaust valve with pressure and a time controlled element governing said spring I means.

21.. In combination, a single vpumping chamber having water inlet and discharge valves, an air admission valve, anair exhaust valve, said air valves being of the puppet type, a fluid pressure motor for opening the exhaust-valve when water has been expelled from the pumping chamber and means for opening the air admission valve a predetermined time interval after the opening of the exhaust valve. I

22. In combination,.a pumping chamber having water inlet and discharge valves, means for admitting compressed air tothe pumping chamber, an exhaust valve, a fluid time controlled means governing the application of said exhaust valve to its seat.

24:. In combination, a pumping chamber having water inlet and discharge valvespan air admission passageway, an air exhaust passageway, valve means for obstructing said passageways one ata time, means for shifting the valve means to one position and time controlled means-for shifting the valves means to the other position. b v y 25.'In combination, a pumping chamber having water inlet and discharge valves, an air admission port, an air exhaust port, valve means for alternately obstructingsaid ports one at a time, a fluid pressure motor for moving the valve means to obstruct the admission port and time controlled means. for moving the valve means to obstruct the exhaust port.

26. In combinatioma pumpingchamber 7 her has refilled. v

27.'In combination, a pumping chamber closing having water inletand discharge valves, a compressed air admission valve, a flu 1dpres-' .su're motor for closing the admission valve upon emptying of the pumping chamber and time controlled means for'ope'ning the admission. valve when the pumping chamber has been'refilled. I a

' 28. In combination, a single cylinder pump comprising a pumping chamber having water admission and discharge valves,

an exhaust port having a valve'seat,an"ex haust valve adapted to be applied to its seat when waterhas filled the pumping chamber, and being'adapted to be held to its seat by the'pressure of the compressed "air within the chamber, a fluid pressure motor adapted to move the: exhaust valve away from its seat when the water has been expelled from the pumping chamber, means to apply the exhaust valve to its seat a predetermined time 7 interval after the escape of pressure from the chamber.

29. In combinatiom'apumping chamber having Water inlet and discharge valves, means vfor admitting compressed air'to the pumping chamber, an exhaust valve'adapted to be held to its seat by the pressure of'the compressed air within the pumping chamber,-

a fluid'pressure motor for moving the exhaust valve away from its seat against pres sure, SillCl fluid pressure motor having lost motion vconnections with said exhaust valve, said lost motion connection comprising "a spring for throwing'the exhaust valve clear of its seat and time controlled means for app y g heexhaus't valve to its seat. 2

In combination, a pumping hamber having water inlet and discharge va'lves, air

admission and exhaust valves of the puppet type, said valves'lying in .line with each other and being adapted to be moved in unison, a fluid pressure motor for operating said valves, a low level float controlling said motor, means for operating the valves in the opposite direction and a time controlled ment governing said latter means. I

In combination, a pumping'chamber having water inlet and discharge valves, means for'admitting compressed air, to the pumpingchamber, anexhaust valve of the j puppet type adapted to be held to its seat by pressure within the pumping chamber, a fluid pressure motor for moving the exhaust valve from its seat-against the pressure'of the' fluid in the chamber, a low level float" controlling the effective application offpres" sure to the motor, Spring means for applying 7 the exhaust valve to its seat, and a time con j trolled element governing said springmeans.

, 32. In' combination, a'pumping chamber having water inlet and discharge valves,'5

means 'for admitting compressed air to the pump chamber, an air exhaust lvalve adapt ed to -be held tto its seat bygthe pressure within the chamber, a pressure motor elefor opening said exhaust valve against thepressure, a lost motion'connection between the fluid pressure motor and the exhaust valve, said connection comprising a pair of engaging shoulders normally held apa rt by a spring, a 'low level float controlling the motor toopen the exhaust valve when Water has j been discharged from the pumping chamber, and time controlled means adapted to operate substantially at the same, time that the water has refilled the pump chamher for applying the exhaust valve to its trolled by discharge, of Water from the pumping chamber for unbalancing said fluid pressures to operatesaid valve means in one direction, and time controlled means for making thereturn stroke of the motor to operate said valve. means in the other di irection.

34. In combinatioma' pumping chamber having water inlet and discharge valves, means for admitting compressed air to the pump chamber,an air exhaust valve, a fluid pressure motor element for operating said exhaust valve, said element being exposed on one side to the pressure within the pump ing'chamber andbeing exposed on the other side totthe pressure "in the Water discharge line, means controlled by'discharge of Water from the pumpi'ng'chamber for unbalancing said pressuresto open the exhaust valve, and time' controlled means for closing the exhaust valve. I

35'. Ina pump, an air'valve, a pumping chamber, a-fluid pressure motor element for operating the air valve, normally exposed.

on one sideto the fluidpressure nthe pumping chamber means controlled by the low, level of the Water withini the pumping chamber for permitting said fluid pressure" to become effective to operate the motor elementto .sh ift said valve means, and time controlled means for closing the exhaust valve. y I, .t y v '3. 'combinati on, a pum ing chamber having" water inlet and disc arge valves,

means for admitting compressed air, to the chamber, an; air exhaust'valve adaptedlto be heldito its seat 'bythe'pressure withinthe pumping chamber, a fluid pressure motor for opening the exhaust valve against the pressure withinthe chamber, and time controlled means for applying said exhaust valve to its seatQj f I 37, In combination, a pumping chamber having water inlet and discharge valves, means for admitting compressed air to the chamber, an air exhaust valve adaptedto be held to its seat by the fluid pressure within the chamber, a fluid pressure motor for moving the exhaust valve awayfrom its seat against the pressure in the chamber, a low level float controlling the pressure motor, and a time controlled element for applying theexhaust valve to its seat.

38. In a pneumatic pump, a valve, abalanced fluid pressure motor element for operating the valve in one direction, low levelmeans for disturbing the balance of pressures to initiate movement in said one direction, valve means for exhausting the pressure on one side of the element to complete a movement quickly in said one direction, said valve means being governed by said element and time controlled means for making the return stroke of the motor.

39. In pneumatic pump, a balanced fluid pressure motor element, low level means for disturbing the balance to initiate movement in one direction, valve means for exhausting the pressure on the opposite side of the element to complete the movement quickly, said valve means being governed by said element, spring means for making the return stroke of the motor, and time controlled means governing said spring means.

40. In a pneumatic pump, a pumping chamber having water valves, means for admitting compressed air, an exhaust valve, a motor for opening said exhaust valve when water has been discharged from the pumping chamber, said motor having a fluid pressure chamber, atubular connection communicating with the interior of the pumping chamber, a valve controlling said tubular connection for trapping fluid under pressure.

in said motor chamber, and a graduated orifice controlling the discharge of pressure from said chamber.

41. In a pump, a pumping chamber having water valves, an exhaust passageway, a fluid pressure passageway, valve means for alternately closing said passageways, a motor element Operated in one direction by fluid pressure for shifting said valve means to close the fluid pressure passageway when water has been discharged from the pump chamber, means for trapping fluid under pressure in said motor, and spring means for shifting the valves to close the exhaust passageway, the action of said spring being controlled by the discharge of the pressure trapped in said motor.

42. In combination, a pumping chamber having Water inlet and discharge valves, an air exhaust valve, a fluid pressure motor above thelevel of the liquid in the chamber at low level for opening said exhaust valve, a tubular connection controlling the entry of fluid pressure to the motor, means for mainhaving water inlet and discharge valves, an

anexhaust valve, a fluid pressure motor above the level of the liquid in the chamber at low level for opening said exhaust valve, a tubular connection controlling the entry of fluid pressure to the motor, means for maintaining a water seal about the end of said connection to insure the discharge of water into said motor, and a low level valve controlling the discharge of water into said motor through said connection, and a spring for making the return stroke of the motor.

44. In combination, a pumping chamber having water inlet and discharge valves, an air exliaust valve, a fluid pressure motor above the level of the liquid in the chamber at low level for opening said exhaust valve, a tubular connection controlling the entry of fluid pressure to the motor, means for maintaining a water seal about the end of said connection to insure the discharge of water into said motor, a low level valve controlling the discharge of water into said motor through said connection, and a spring for making the return stroke of the motor, said motor having a graduated orifice for permitting the dissipation of the fluid pressure admitted to the motor.

45. In a pneumatic pump, a pumping chamber having water inlet and discharge valves, means for admitting compressed air to the pumping chamber, an exhaust valve adapted to be held to its seat by pressure within the pumping chamber, a fluid pressure motor for moving the exhaust valve ofl? its seat against the pressure within the chamber, said motor being located above. the low water level of the pumping chamber, a connection between the motor and the interior of the chamber, said connection being invariably water sealed, and a low level valve controlling the effective application of pressure to the motor. i 46. In a pneumatic pump, a pumping chamber having water valves, means for ad mitting compressed air, an exhaust valve adapted to be heldto its seat'by pressure within the pumping chamber, a fluid pres sure motor having a connection with the interior of the pumping chamber for opening said exhaust valveagainst the pressure within the pumping chamber, a lost motion connection between saidexhaust valve and said motor for permitting the exhaust valve to be moved ahead of the'motor after the valve has been cracked from its seat, a low level float controlling the operation of said '47-, In a pneumatic pump, a pumping chamber having Water inlet and discharge valves, means for admitting compressed air tofthe pumping chamber, an exhaust valve adapted to be opened when water has been s expelled from the pumping chamber, a fluid pressure motor for operating said exhaust valve, a low level float governing the operation of said motor,said motor comprising a chamber and a movable Wall for the same, a fluid admission passageway for the motor, a valve controlledby operation of the motor to open the exhaust valve to close the motor chamber admission passageway, and

spring means connected between the mov able wall of the motor and said valve for holding said valve over the motor admis sion passageway until the pressure has been discharged from the motor chamber, said chamber having an orifice for permitting the discharge of pressure therefrom under the influence of said spring and means for restoring the exhaust valve to its seat after pre'ssurehas been discharged from the motor chamber. V

48. In a pumpof the class. described, a head for thepump having an exhaust valve, a pressure motor below said exhaust valve,

said motor having a pressure chamber with.

anopening belowthe exhaust valve, a movable member for the motor, means controlled by low level conditions within the pump for permitting the effective application of prcssure'to the motor, a spring cage connected to the movable motor member, a stem connected to the'exhaust valve, a spring lying between the cage and the exhaust valve, said stem and cage having interening/the return stroke of said element and time controlled means governing the operation of-said last named means.

5 0. In a pneumatic pump, a balanced fluid pressure motor element exposed on both sides to: the pressure within the pumping chamber, low level means for disturbing the balance to initiate movement "of the element In one direction, valve means actuated by said initial movement for exhausting thepressureonone side of the element to com- 7 plete said n tiated movement, and means 1npressure Within the pumping chamber,

means controlled by low level for disturbing the balance to initiate movement of the element in one direction, valve means operated by said initial movement for further unbalancing the pressure to complete the initiated movement, means operated by said completed movement governing the exhaust of pressure causing the movement of the element, and a dash pot controlling the return stroke of the motor. 1 J

52. In a pneumatic pump, a fluid pressure chamber, a movable wall comprising a motor element for said chamber, a low level valve controlling the effective application of pressure to the motor element, a fluid pressure admission passageway for the fluid pressure chamber and afluid pressure discharge passageway for said chamber and valve means controlled by the completion of the stroke in one direction for closing the admission passageway and means for making the return stroke of the motor element with said valve closed.

53. In a pneumatic'pump, water inlet and discharge valves, means for. admitting compressed air, an exhaust valve adapted-to be held to its seat by the pressure within the pumping chamber, a fluid pressure motor :t'orpulling theexhaust'valve ofl of its seat when water has been discharged'from the chamber, said motor having a fluid pressure chamber, a: tubular connection leading into said chamber, a low level valve controlling. the discharge of fluid through said tubular connection into said chamber.-

, 54. In combination, a pumping chamber having water inlet and discharge valves,

means for admittingcompressed air to the pumping chamber, an exhaust valve adapted to be heldto its SGZItZbYtPI't-BSSUIG, a fluid pressuremotor operated by the pressureof the fluid within the pumping chamber for pulling the exhaust-valve oil" of its seat against pressure, a lost-motion connection between the motor and the valve, a motor chamber for the motor element, atubular connection for admitting pressure to the chamber, and means for ma ntaining a water seal on said tubular connection, said motor being controlled by low level conditions for opening the exhaust valve.

55.111 combination, a pumping chamber having water inlet and discharge valves, means for admitting compressed air, an exhaust valve adapted to be held to its seat by pressure within the pumpingchamber, a. diaphragm vfor moving the exhaust valve off of its seat'against pressure, means for throwing the valveaway fromits seat after the diaphragm has started the valve to open, a tubular connection for the "admission of water to said motor diaphragm, a valve controlling the entry of Water to said tubular connection for operating the diaphragm and a spring for making the return movement of the diaphragm; i

56. In a pneumatic pump, a pumping chamber having Water valves, means for ad mitting compressed air to the chamber, an exhaust valve, a fluid pressure motor for openin the exhaust valve, low' level float controlIing the initial movement of the motor, means controlled by the initial movement for accelerating the movement of the motor and a sniflle hole or discharge port for permitting. the slow discharge of pressure from the motor. 1

57. In a pneumatic pump, a pumping chamber having water valves, means for admitting compressed air, an exhaust valve adapted to be heldto its seat by pressure within the pumping chamber, a motor comprisinga chamber and a'diaphragm, a tubular connection for permitting the entry of fluid into the motor chamber, a low level valve governing the discharge of fluid into said-"chamber through said connection, and

a sniflle hole controlling thedischarge of fluid from said motor chamber. i i

58. In a device of the class described, a pumping chamber having water inlet and discharge valves, means for admitting compressed air to the pumping chamber, an exhaust passageway, an exhaust valve adapted to be held to its seat by pressure within the pumping chamber, said exhaust valve governing said exhaust passageway, a fluid pressure motor lying below the exhaust valve, said motor comprising a chamber having a tubular connection immediately below the exhaust valve and adapted to be obstructed by the exhaust valve when in open position,

"and a movable member adapted to be moved by differences of pressure to open the exhaust valve from its seat and to obstruct the tubular connection of the motor with the pumping chamber, a lost motion connection betweenthe movable member and the exhaust valve comprising aspring cage and a stem, anda spring between'the cage and stem, a low level float controllingthe forcing of pressure through said tubular connection into the chamber'to move the movable member of the motor to open the xhaust valve and to trap fluid within the motor chamber and means for forcing the movable motor member in a direction to close the exhaustvalve, the action of said means upon the exhaust valvebeing delayed until the lost motion is taken up between the exhaust valve stem and the cage, said action consuming a predetermined amount of time andbeing' controlled by the olischarge oi the fluid pressure trapped within the motor chamber through a sniffle hole or orifice in the walls "ofthe motor 'chamber.

59. In a device of the class described, ,a

motor chamberhaving a tubular connection for the entry of fluid pressure, a diaphragm forming one wall of said cham'ber,a balanc ingchamber on the other side of the dia- 'phragm, a "relief valve having a stem extending adqacent the diaphragm member when the diaphragm is in one extreme position, apassageway for admitting pressure to said balancing chamber, means controlling the application of a greater pressure to the motor chamber than to the balancing chamber, means for exhausting the pressure from the balancing chamber comprislng the above mentioned relief valve, a spring for and a time controlled element for operating the valves in the other direction. 7

61. In a'pump, a pumping chamber having water valves, an air exhaust valve of the puppet type closing with pressure,'a motor 'for moving the exhaust valve off of its'seat,

said motor being operated by the ifluid pressure within the chamber, means'for trapping apredetermined amount of wateriin the pumping chamber for operating said motor, and a low level float controlling the discharge of said water into said motor for '10s opening the'exhaust ivalve.

62. In combinat on, a pumping chamber, Water valves, means for admitt ng compressed air to the'pumping chamber, an exhaust valve", a fluid pressure motor for operating the exhaust valve, means for trapping a predetermined amount of water in the pump chamber, and a low level float con- 63. Incombination, a pumping chamber having water valves, means for admittlng compressed a1r, an exhaust valve adapted to be heldiclose d by pressure within the trolling the discharge of said water into H the motor for opening the exhaust valve.

pumping chamber, a fluid pressure operated motor adapted'to be operatedvby the pressure within the pumping chamber, means within the pumping chamber for trapping a predetermined quantity of water, said waterbeing adapted to be forced into, the pressure motor, and a" low level valve controlling the forcing of said water into the pressure motor, and lost motion connectron between the exhaust valve and the pressure motor for permittingthe valve to be 1 thrown away from its seat after it once starts to open. 7

closing of said exhaust valve.

I 65. In'combination, a pump "chamber having water inlet and discharge valves,-means for admitting motive fluid, a balanced pressure motor, an exhaust valve adapted to be held to its seat by pressure and moved from its seat by said motor, means controlled by low level of water within the pumping chamber for unbalancing the pressures on said motor element,- and a relief valve on 'ing chamber formovingtheexhaust valve away from its seat against the pressure in one side of the motor element, said relief valve opening to the exhaust port on the atmospheric side-of the exhaust valve 66. In combination,- a pumping chamber having water inlet and discharge valves,:an air admission valve, an exhaust port, an exhau'st valve adapted to closethe port when water has filled the pumping chamber and to be held to seat by the fluid pressure in the pumping chamber, a fluid pressure motor controlledby low water level in the pumpthe chamber, and aspring adapted to, apply the exhaust valve to its seat when there is vno fluid pressure in the pumping chamber.

67. In a pneumatic pump the combination with a pump chamber and a valve for admitting compressed air to said pumpchamber, offluid actuated means for operating said valve, and means adapted to move said fluid actuated means and said valve to retain said valve in one of its extreme positions when there is no air pressure on the 68. In a pneumatic pump the combination of a pump chamber, an air valve, a fluid motor comprising a cylinder and a piston and means-for permitting water to be forced from the pump chamber to the cylinder to actuate the piston and the air valve, the cylinder being providedwith a bleed hole in the top thereof.

69. In a pneumatic, pump the combination with a pump cham ber provided with water inlet and outlet valves, of an air valve and a fluid motor for actuating-saidair valve,

said motor being connected with the interior of the pump. chamber and means for main 'falning-a water seal between the motor and the. air in the pump chamber for pressure and exhaust;

' 70. In a pneumatic pump the combination with a pump chamber provided with water inlet and outlet valves, of an air valve and-- a fluid motor for actuatingsaid air valve, said motor being connected with the inter or of the pump chamber, means for maintainexhaus't,and a low level float governing the forcing of the water into the motor to actuate the air valve. 7

71. In combination, a pumping chamber, a pump chamber having water inlet and discharge valves, an air admission valve, an air exhaust valve, a pressure motor for opening the exhaust valve and closing the admission valve when the water has been dising a water seal between the motor and the air in the-pump chamber for pressure and charged from the pump chamber, and a spring for holding the admission valve open and the exhaust .valve closed when there is no pressure on the pump.

72. In combination, a pumping chamber having water inlet and discharge valves, means for'admitting' compressed air to .the chamber, an exhaust valve, a pressure motor for opening the exhaust valve when water has been discharged from the pump chamber, means for trapping a body .of Water in" the pump chamber and a low level floatcontrolling the forcing of said water into the motor to open the exhaust valve; I 73. In combination, a pumping chamber having water inlet and discharge valves,- "means for admitting compressed air to the chamber, an exhaust valve, a pressure motor for 'opening the exhaust valve when water has been discharged from the pumpchamber, means for trapping a body of water in the pump chamber, and a low level float controlling the forcing of said water into the motor to open the exhaust valve, and means for forcing the water out of the motor before the exhaust valve isapplied toits seat.

74. In combination, a single cylinder pump, a source, of compressed air, an air spring connected to the pump and a closed faucet controlled delivery system connected to the pump and tank, said pump comprising valves for liquid, a main air valve mechanism, a pressure motor controlled by low level of liquid in the pump to shift the main air valve to exhaust position and time controlled means governing the closing of the exhaust. Y

75. In combination. a single cylinder pump, a source of compressed alr, an air spring connected to the pump and a closed faucet controlled delivery system connected to the pump and air spring, said pump comprising valves for liquid, a main air valve mechanism, a pressuremotor. controlled b low level of liquid in the pump to shift the main air valve to cut off further admission of compressed air and time controlled means for shifting the valve to readmit compressed air.

76. In combination, a pump chamber, valves for liquid, an exhaust valve of the puppet type adapted to be held to seat by pressure, means for admitting compressed air to the pump chamber, a motor chamber having a movable motor member, a connection between the motor chamber and the pump chamber, a low level control device governing the movement of said motor memher by fluid under pressure admitted to the motor chamber, and valve means for trapping fluid in said. motor chamber to hold the exhaust valve open.

77. In combination, a pump chamber, valves for liquid, an exhaust valve of the puppet type adapted to be held to seat by pressure, means for admitting compressed air to the pump chamber, a motor chamber having a movable motor member, a connection between the motor chamber and the pump chamber, a low level control device governing the movement of said motor memher by fluid under pressure admitted to the motor chamber and valve means for trapping fiuid in said motor chamber, said motor chamber having a leakage port for permitting the escape of said trapped fluid.

78. In combination, a single pumping chamber having Water inlet and discharge valves, a closed faucet controlled delivery system connected to said pumping chamber, compressed air admission and exhaust valve means, a fluid pressure motor for operating the air valve means and a time controlled element governing said air valve means.

79. In combination, a pumping chamber having Water inlet and discharge valves, means for admitting compressed air to the chamber, an exhaust valve, a fiuid pressure motor for opening the exhaust valve, means controlled by loW level in the pumping chamber governing the operation of said motor, and time controlled means for closing the exhaust valve.

In Witness whereof I hereunto subscribe my name this 10th day of November, 1919.

BURTON S. AIKMAN.

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