US1253559A - Pump and pumping system. - Google Patents

Description

B. S. AIKMAN.

PUMP AND PUMPING SYSTEM.

APPLICATION FILED SH12?, 1915.

Patented Jan. 15, 15H8.,

3 SHEETS-SHEET 1I B. S. AlKNIAN.

PUMP AND PUMMNG SYSTEM;

APPLICATlON FILED SEPT.27. 1315.

Patented Jan. 15, 1918.

B. S. AIKMAN.

PUMP AND PUNIPING SYSTEM.

APPLICATION man sEPT.27.1915.

Patented J 311.115, v19'18.

3 SHEETS-SHEET 3.

psranp sas ramen @prima BURTON SJ IKMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO NATIONAL BRAKE lt ELECTRIC COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

PUMPv AND rui/irme susanna.

tenesse.

To all 'whom 'it may concern:

Be it known that I, BURTON S. AIKMAN, a citizen of the United States, residing in the county of Milwaukee and State of Wis consin, have invented a certain new and useful Improvement in Pumps and Pumping Systems, of which the following is a full,`

vthe intervention of a storage or reserve tank,

and which will be under faucet control, by which I mean that the iiow of water is controlled by the acts oi' opening and closing the faucets which form the supply outlets ot' the system. l l

To supply water fresh from the well and to maintain the flow of Water under faucet` control is a matter of prior art. The appa ratus and systems heretofore known and used were, however', subject to inherent difiicultics, due to the fact that their mode of operation required complexities such as al-l ternately-operating chambers, valves operated by marginal diierencesin pressure or by time-element devices, and to the fact that the pneumatic control employed led to frequent inisoperations such as are commonl y called blow-overs where the system becomes cleared ol water and the compressed air, employed as an operating medium, is wasted.

According to my invention, there is pro- 'vided a single water-chamber alternately subject to au' pressure and relleved there `from, the alternations being secured by the actuati'ons of valve mechanisms which, in turn, are directly and mechanically dependent upon the rise and fall of the water in the chamber. -l't 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. The

Specification of Letters Patent.

Patented dan. 155, 19153.

Application led September`27, 1915. Serial No.'52,08.

last-mentioned characteristic is due to the direct relation of the valve mechanism to the water levels, whereby the movement of the valve is dependent upon the physical change which requires such movement, and I provide means for causing sudden actua tions of the valve mechanism notwithstanding the fact that the rise and fall of the Water in the chamber is comparatively gradual.

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 is a vertical axial sectional view taken on the plane of the line 3, 3 or' Fig. 2 and looking in the direction indicated by the arrows;

Fig. 1 is a vertical, axial sectional view taken on the plane of the line 4, L1 or Fig. 2 and looking in the direction indicated by the arrows; and

' F ig. 5 is a sectional View taken on the plane of the line 5, 5, of Fig. 3 and-looking in the direction indicated by the arrows.

Ret'crringrst to 1, which, as before stated, is diagrammatic, it willl be seen that the well curbing is illustrated at 8, the water-level being' indicated at 9. The pump structure, which I have indicated lx by the reference character 1U, is disp the well at a suitable distance belo" water-level therein, as :ill be described. rihe pump structure has lI ing therefrom three pipes, an ail-pressure'. pipe 11, an efsiia pipe 12, anda water-discharge pipe 113. "if air-pressure pipe 11 connected with a com pressed-air tank 14, in which airis coin-- pressed by means of a compressor 15', operated, for instance, by an electric motor 1G.

It will be clear to those skilled in the art that the compressor 15 may be operated by any suitable means, such as a gas-enginc or steanrengine, and if desired means :muy i provided for automatically starting' and stopping the prime' mover dependent upon the fall and rise of pressure in the tanl: la. `In the pipe 11 the cut-off valve 11, air strainer 11", reducing valve 11, gage lid, 1t and drain cock 11" are provided. Y

The water-discharge,pipe 1E". leads tc rarious branch-pipes 17 and 18, each of w lich in turn, leads to an outlet faucet 19. By means 'of a pipe 20, the discharge pip. 13

titi

is connected with a chamber 21, closed eX- cept for the entry pipe 20, for a purpose l which will'be pointed out presently.

, It will now be understood that this .system represents an isolated plant for instal lation in a residence, for instance. The water-discharge pipe, leadsv trom the `well, conveniently near by, to the distribution pipe in the building, and the compressor,

motor, compressedair tanlr and chamber are suitably housed' inany convenient way.

'As'before'pointed out, pressure is constantl maintained upon the system. Itis there ore necessary to maintain a certain pressure between predetermined minimum Fand maximum limits in the compressed-air tank '14, this being done lby the proper start- VAing and stopping of the compressor 15,

, either. manually or automatically. It has [every two or three days, for a short time,

inforderto keep the pressure in the comy .pressed-air tank within the desired limit.

It will appear as this description proceeds that, with the pressure properly niaintalned 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 immediately commences. -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 l distribute it -to whatever points desired.

I refer now to igs. 2 to' 5, inclusive, to

v, describe the pumping mechanism. A headmember 22 and a base-member 23, both of circular form, are joined by a cylindrical housing 24, which forms a water-chamber 25. As illustrated in Fig. 4, the head-member 22 and the base-member 23 are tied together by means of twopipes 26, 26, whichl thread into downward extensions from the head-member 22 and which set 'n sockets27,

27 in the base-member 23. Screw-plugs 2 8,

28 'are inserted in the lower ends of the pipes 26, 26, these screw-plugs being adapted for the reception of capscrews 29, 29,

. l which, as shown, firmly hold the base-memberl 23 in place and clamp the housing 24 `between the base-member and the headi member to, form a watertight and airtight compartment. The base-member 23 is provided on its under sideivith a central extension 30, to which a nut 31 is screw-threaded, a conical screen 32 being clamped between the nut 31'and thecxtension, as illustrated. The base-member 23' is provided with' two water-inlet openings '33, 33, each fof ,nwhch is controlled by va lift-valve y34,

' mounted to reciprocate in a bracket 35'on -the upper sidfeeot the basemember 23, and rovided with a spring 36, tending to hold it in closed position. 'The water which comes into the water-chamber by way of the openings 33, 33 is,` as will be described later, forced from the chamber by way of the openings 37, 37, in the lower ends of the pipes 26, 26, the water passing upwardly through lthe pipes 26, 26, as will be described. The head-member 22 is provided with the atmosphere or exhaustgpassageway 47, the compressed-air-inlet passageways 48 and 49, the primary water- chambers 50, 50, with which the pipes 26, 26 are connected, and the secondary water-chamber 51. These passageways and chambers are isolated from each other, as will be described, the atmosphere or exhaust passageway being connected with the pipe 12, the compressed-airin let passageway 48 being connected with the pipe 11, and the secondary water-chamber 51 being connected with the dischargepipe 13.

Referring now to the atmosphere-inlet or exhaust passageway 47, it will be seen that it is so fashioned as to lead to the'axial.v opening 52 in the head 2.2, a valve-seat 53 surrounding this opening. A lift-valve 54 having a compressible face 55 coperates with the valve-seat 53 to open and close the' opening 52, the valve 54 being mounted upon a stem 56 for vertical movement. The stein 56 is provided with a 'shoulder 57, to which I shall refer again later, and with an enlargement 58, whichrides in a sleeve 59 set axially in the head 22 and disposed con centrically in the opening 52.. .A helical ico spring 60 is confined in the sleeve 59, be-

tween the enlargement 58 and the face of the valve 54.

The two compressed-air-inlet passageways 48 and 49 are connected by a port 61, which has a valve-seat 62 surrounding the upper end thereof, this valve-seat coperating with a valve'63 having a eompressible face 64. The valve 63 is nu' "ed or an auxiliary stem 56 which pas through the opening 61 and is arranged be engaged by the enlargement 58. "l valve 63 is guided in a pocket 68, axif iii the top 'of the head 22, this pocket P plug 69. The valve i grooves 70 in order to on opposite sides of tb open position, a sprii. between the plug 69 an ingpto move/the valve do ,ce the pressure Je when it is in being disposed v ardly.

j Secured to the under side of the head 22 is a .diaphragm-chamber structure 72. This .structure provides a diaphragmechamber 73,

valve and tendvl'which is 'closed at the top by the diaphragm `7.4, the central part of this diaphragm being 'clamped between the two plates 75, 7 5, which in turn are clamped between a shoul iso insegnate passageway 81, cored in the diaphragmjohamber casing 72- and `in the head 22, and

the exhaust port 80 is connected with the atmosphere or exhaust passageway 47 by means of the passageway 82, cored in the diaphragm-chamber casing and the head '22, as clearly illustrated in Fig. 3.

The' valve mechanism which controls the two ports 79 and 80 will now be described:

It-.will be seen that these two'- parts are coax1a1 and that they are transversely oppo `site each other. Concentric with the axis of these ports, a tube 83 is suitably mounted and this tube has telescoping therein another tube 84. The tube l83 is formed integral with a plug 85, screwed into the diaphragm-chamber casingand a spring 86 is disposed between a collar 87 on the inner tube 84 and the plug 85, this spring thus tending to move the inner tube out ot' the outer tube. The inner tube has its ends closed by means of the plugs 88and 89, and

' each of these plugs carriesa needle-valve,

the needle-Valve which controls the port ,79 being indicated by the reference character 90, and the valve which controls the port being indicated by the reference character 91. is provided with a ,head 92, which head limits the outward mvement of the valve, a, spring 93 being disposed between the two heads, as shown in Fig. 3. ln order that thc port 79 may communicate properly-with the diaphragm-chamber 73, the ports 94 are pro- 'vided in the tube 83.

Supported from the under side of the dia.- phragm-chamber'structure 72 is a cylinder 95, closed except for the opening 96 at the top and the open bottom. Toward the lower 'end of the cylinder 95 it is internally provided with a ring 97, .which provides a valve-seat 98 adapted to be engaged by theball fioat-\'alve 99. A. bracket 100 extends from the diaphragm'chamber structure 72 and a bell-crank lever 101 ispivoted thereto at 102. The upper arm of the bell-crank lever contacts with a reciprocating pin 103 set inthe casing of the diaphragm-chamber and engagingthe inner tube 84. The lower arm of the bell-crank 'lever extends through the opening 96 into the cylinder' 95, and a Y water-weight or float 104 is hung from this arm of. the bell-crank lever at the pivot 105. The lower end of this water-weight or float is provided with a stem 1 06 extendlng downw Each of the valves, within. the tube 84,

wardly therefrom, this stem being guided in a sleeve 107 carried from the ring 9i' 'by means of the spider 108.

The water- chambers 50, 50 are provided with the outlet passageways 109, 109, each oi which is controlled by a ehecltnvalve 11.0,

between which and a corresponding plug 1 111 a spring 112 is disposed. As will he described, the water is forced 'from the chambers 50, 50 into the secondary water-chamber 51, passing these valves, and from the secondary chamber 51 the water is forced on to the distribution system.

The operation of the device is as follows: Let it be assumed, by reference to Fig. 3, that the apparatus is now in such condition that water is being forced t'rom the chamber 25. The chamber has been partly emptied and the inner tube 84'is in its righthand position. In this condition the com pressed air is transmitted down from the passageway 48 through the passageway 81, port. 79 and ports 94 into the diaphragmchamber 73, and thus the diaphragm is held in its uppermost position, the port 80being closed. With the diaphragm in its upper position the `valve 54 is seated upon the valve-seat 53 to close oif the atmosphere to the water-chamber, and the valve (53 is lifted Jfrom its seat 62 to admit compressed air down through the passageway G1, passageway 49 land into the water-chamber. Thus, assuming that the water in the distribution systelnhas an outlet, theV compressed air forces the water out of the water-chamber through the openings 37, 37, in the pipes 26, 26, then upwardly through the pipes 2G, 26, then through the primary water- chainbers 50, 50, past the valves 110, 110, and on to the system.

It will be understood, as this description the valve 91 is held closed under the above' A l conditions by the action of the spring 86, the float or water-weight 104 being supported by the water within the cylinder 95 and thus exerting no iniiuence to overcome the tension of this spring. However, as the water is forced from the chamber 25, the level is gradually lowered to a point where the float or water-weight 104 comes down. This movement is transmitted by the mechanism which has beendescribed to the tube 84 to move it toward the left against the tension of the spring 88. This action closes the port 79 and opens the port 80, thus exposing the diaphragm-chamber 73 tothe atmosphere. This unbalanced position, with pressure above the diaphragm and atmosphere below it, results in an immediate re-Y versalof the valves 54 and 63. In the down-V entryof water, and, as the water rises in the chamber 25, the iioat-valve 99 is raised to its seat 98 to close off the cylinder 95 above that point. Thus, although the water rises farther in the water-chamber 25, it does not rise within the cylinder 95 beyond the valve and there is no edect upon the water-weight or lioat until the water in the chamber has reached the plane of the bottom ot' the opening 96, after which it pours into the cylinder 95 quickly and raises the float or water-weight to release the pressure'against the spring 88. This allows the sprang to act to close the port 80 and open the port 7 9.

This action brings the pressure of the com' pressed air into the diaphragm-chamber 73 and raises the diaphragm.

It is pertinent here to point out several important features inthe action which have' been described. With the entry of water into the watenchamber from the well there is a comparatively gradual rise of the level in the water-chamber, but there is no etect upon the float or water-weight until that 90 and y the compressed air.

level has reached its maximum. Then, suddenly, after the desired levelhas been attained, the water-weight is actuated. It will be seen, also, that the relation of the valves 91 is such that when the shift from one position to the other is made the compressed-air port is closed before the atmosphere-port 1s opened, and the atmosphereport is closed beforethe compressed-air port is ppened, thus avoiding any chance of a direct connection between the compressedair port and the atmosphere, even foran instant. The same feature lies in the relative action of the valves 54 and 63. Here, again, it will be noted that the arrangement is such that the valve 63 is closed before .the valve 54 is opened, and the valve 54 is closed before the valve 63 is opened, air pressure maintaining the valve 54 closed immediately it is seated. When the reversal of the'valves .54 and 63 takes place, as has just been described, the water-chamber 25 is again closed olf to the atmosphere and is made subject to Under these circumstances, reference to Fig. 1 will show that waterwill also be forced into the air-chamber 21, confining an air-.cushion above the water-level formed there1n,as indicated in dotted lines. It will be clear that if all the outlets of the distribution system are closed-,- everything will be at rest since, although there is pressure on top of the water in lthe chamber 25, there is no outlet for the water.

' stanti-ally those proportions, submerged 'about ten feet below vthe level of the water in the well, a period of about 1.5 seconds is required for the filling operation. if the capacity of the discharge and distribution pipes is great enough, this momentary cessation oi pressure will be hardly perceptible at the faucets, particularly since the expulsion period, assuming one or more faucets to be open for a considerable length ot time, consumes practically all the time. However, in orderthat the gap in the dow may be properly .filled in, l. provide the ainchamber 2l to which the pipe 20 delivers from the dischargepipe 13, Obviously, when the unter 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 inthe chamber and forms a cushionwhich is maintained so long as the pressure is not relieved. As soon as the pressure is relieved, however, by the cessation of the pressure in the pump, with a faucet open, the air is given opportunity to expandv and in doing so forces out the water which has become trapped therein andprovides a How from the faucet during ,the refilling period of the pump. This chamber '21 will, of course, be distinguished from a storage tank, since all it does is te increase the capacity of the system and provide means for a certain amount of'compression to be released for a very short period, about 1.5 seconds, at a time. It will be understood that this water which is in the chamber 21 is directlyv a part of the discharge system, being located in effect directly between the well and the faucet, and is constantly being changed and in this way a continuous iiow from the faucetis insured. I have found by experi ment that the air in the chamber 2l 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 openingof the faucet.

It will be seen that the upper and lower levels of the water in the chamber 25' positively determine the reversal of the valves. The atmosphere condition is maintained until the upper level reaches the bottom of weight. In ythis way the reversal of the naaaeee valves is mechanicallyvdependent upon the' cc'exditions which require their reversal, and i e is thus secured a positive and reliaoe operation not subject to the defects pointed out in the early part of this description.

lit will be seen that the reversal ot' the valves is sudden, as has been described, and that the arrangement is such that at no time is there even a momentary connection between the compressed air and the atmosphere. lt will be clear that suction instead of full atmosphere may be applied to the pipe 32 without departing from the spirit and scope of my invention.

l' 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.

1. ln a pump, a liquid chamber having inlet and outlet means, Van exhaust passageway, a pressure-medium passageway, a pressure motor, valve mechanism operated by said pressure motor to control the connection of said Achamber alternately with said passageways, and means controlling` the connection or' pressure to and exhaust from said pressure motor. l 4

In a pump, a liquid chamber having inlet and outlet means, an exhaust passageway, a pressure medium passageway, a pressure motor, valve mechanism operated by said pressure motor to control the connection of said chamber alternately with said l the rise and fall of liquid in said chamber controlling the connection of pressure to and exhaust from said pressure motor.

3, Ain a pump, a liquid chamber having inlet andoutlet means, an exhaust passage* wav, pressure medium passageway, a pres sure motor, valvev mechanism operated by said pressure motor to control the connection o said, chamber alternately with said pass g.,ways, means controlling1 the connection or pressure to and exhaust from said pressure motor and level controlled means mechanicallly connected with said controlling means,

4a ln a. pump, a liquid chamber having inlet and outlet means, an exhaust passagen rs ad,

way, .a pressure medium passageway, a presl sure motor, valve mechanism operated'by said pressure motor to control the connesn tion of said chamber with said passageways, means controlling the connection oi pressure to and exhaust from said pressure motor, a water chamber havingan inlet at the top and an outlet at the bottom, and a level controlled device ln said vWater chamber mechanically connected with said controlling a passageways, and means operated by' 5. ln a pump, a liquid chamber having inlet and outlet means, a'n exhaust passageway, a pressure medium passageway, a pres sure motor, valve mechanism operated by said pressure motor to control the connection of said chamber with said passageways,

' means controlling the connection ot pressure to and exhaust from said pressure motor, a water chamber within said liquid chamber having an inlet at the top and an outlet at the bottom, and a level controlled device in said water chamber mechanically connected with said controlling means.

Ina pump, a liquid-chamber having inlet and outlet openings, an exhaust-passageway, a pressure medlu'm passageway, pressure-means having one side arranged to b e exposed to the pressure medium and its other sido exposed to a motor chamber having two ports, one port an exhaust-port and the other a pressure medium port, valves operated by said pressure-means for closing said pressure medium port of said liquid chamber and open ing said exhaust-port of said liquid chamber, and viceversa, and valves for closing said pressure medium' port of said motor chamber and opening said exhaust port of said motor chamber, and vice versa, and means for operating said last-named valves.

, 7 Ina pump, a liquid-chamber having inlet and outlet openings, an exhaust passageway, a pressure medium passageway, pressure-means having one side arranged to be exposed to the ressure medium and its other side exposed) to a chamber having two ports, one port an exhaustport and the other a pressure medium port, valves operated by said pressure-means for closing said pressure medium port of said liquid chamber and opening said exhaust-port of said liquid chamber, and vice versa, and valves 'for closing said pressure medium port of said4 motor chamber and opening said exhaust port of said motor chamber, and vice versa, and iioat means for operating said lastaiained valves. 8.1m a pump, a water-chamber having inlet and outlet openings, an exhaustport for said chamber, a compressed air port for said chamber, pressure-means having one side exposed to the interior of said waterrhamber and its other side exposed to a motor chamber having two ports, one port .an exhaustu port and the other a compressed-air port, valves operated by said pressure-means for closing said compressedair port of said water chamber and opening said eshausa port of said water chamber, and vice versa, and valves for closing said compressedair port of said motor chamber and .then opening said exhaust port of said motor chamber, and vice versa, and means for operating said last-named valves.

9. In a pump, a water-chamber having inlet and outlet openings, an exhaust-port for said chamber, a compressed-air port for said lll@ chamber, pressure-means having one side .exposed to the interior of said water-chamber and its other side exposed to a motor chamber having two ports, one port an exhaustport and the other a compressed air port, valves operated by said pressure-means :for closing said compressed-airaport and opening said exhaust-port of said Water chambei' and vice versa, and valves forelosing lchamber and its other side exposed to a motor chamber having two ports, one port an exhaust-port and the other a compressed-air port, valves operated by said'pressure-means for closing said compressed-air port and opening said exhaust-port of said water chamber, and -vice versa, and valves for closing said compressed-air port and opening said exhaust port of said motor chamber and vice versa, a float forv operating said last named valves and a float-chamber for said float in said water-chamber, said float-chamber having an inlet at the top andan outlet atthe bottom.

11. In a pump, a water-chamber having inlet and outlet openings, an exhaust-port for said chamber, a compressed-air port for.

said chamber, pressure-means having one side exposed to the interior of said waterchamber and its other side exposed to a motor chamber having two ports, one port an exhaust-port and the other a compressedair port, valves operated by said pressuremeans for closing said compressed-air 'port and opening said exhaust-port of said Water chamber, and vice versa, and valves vfor ciosing said compressed-air port and opening said exhaust port of said motor chamber and vice versa, a float for operating said last-named valves. and afloat-chamber for said float in said Water-chamber, said fioatchamber having an inlet at the 'top and an outlet at the bottom, and a valve controlling said outlet.

12. In a pump, a water-chamber having inlet and outlet openings, an exhaust-port for said chamber, a compressed-air port for said chamber, pressure-means having one side exposedto the interior of said waterchamber and its other side exposed to a motor chamber having two ports, one port an exhaust-port and the other a compressedair port, valves operated by said pressuremeans for closing said compressed air-port -outlet at the bottomy and a ioat-valve conand opening 'said exhaust port of said water chamber, and vice versa, and valves for closin said compressed-air port and opening said exhaust port of said motor'ehamber, and vice versa, a float for operating said lastnamed valves, and aV float-chamber for said float in said Water-chamber, saidtloatchamber having an inlet at the top andan trolling said'outlet. 75

13. In a pump,'a water-chamber having inlet and outlet openings, an exhaust-port for said chamber, a compressed-air port for said` chamber, pressure-means having one side exposed to the interior of said water-chamber and its other side exposed to a motor chamber having two ports, one port an exhaust-port and the other a compressed-air port, valves operated by said pressure means for closing said compressed-air port and opening said exhaust-port of said water chamber, and vice versa, and valves for closing said compressed-air port' and opening said exhaust port ofsaid motor chamber, and' vice versa, a float for operating said last-named valvesand a float-chamber for said float in said water-chamber, said ioatchamber having an inlet at the top and an outlet at the bottom and a float-valve controlling said outlet, said last-named valves tending tio open the compressed-air port and close the atmosphere port and being reversed by the dropping of the iioat.

14. In a pump, a Water-chamber having inlet and outlet openings, an exhaust-port for said chamber, a compressed-air port for said chamber, pressure-means having one side exposed to the interior of said AWaterchamber and its other side exposed to a motor chamber having two ports, one Vport an exhaust-port and the other a compressed-air port, valves operated by said pressure-means for closing ksaid compressed-air porty and opening said exhaustport of said water chamber, and vice versa, and valves for closing said compressed-air port and opening said exhaust port of said motor chamber, and. vice versa. and means for operating said last-named valves, said pressure-means operating to close the first-'named exhaust-port 115 ies - and open the first named compressed air port when the last-named chamber is exposed to compressed air, and to reverse the action when said last-named chamber is exposed to the exhaust.

15. In a pump, a main liquid chamber having inlet and outlet means, an exhaust passageway, a pressure medium passageway, a pressure motor, main pump valve mechanism operated by said pressure motor to control connection of the pump chamber alternately with said passageways, fluid pressure connections for operating the motor independently of the Huid pressure in the main chamber and means governed by rise and fall 0f li er for eonrolling the moor.

1G. In a. pun

inlet and outlet 1neans,van exhaust Way,

pressure mcdiu pressure motor, valve mechanism by said pressure motor to control necton of said ways, and mea chamber with said ns directly mechani mesme quid 'in the main. chana liquid chamber having passagem passageway, a

operated the conpassagek cally related to the high level of th e'liquid in said 104 chamber controlling the connection of pressure to said pressure motor,

and means directly mechanically related to the low level of the liquid in said chain the exhaust from said press ln Witness whereof, I her ber controlling ure motor. culito subscribe

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